Add pexpect-2.3 to third_party

BUG=154343
NOTRY=True

Review URL: https://chromiumcodereview.appspot.com/11142035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162303 0039d316-1c4b-4281-b951-d872f2087c98

10 files changed, 3370 insertions, 0 deletions

diff --git a/third_party/pexpect/ANSI.py b/third_party/pexpect/ANSI.py
new file mode 100644
index 0000000..537017e
--- /dev/null
+++ b/third_party/pexpect/ANSI.py
@@ -0,0 +1,334 @@
+"""This implements an ANSI terminal emulator as a subclass of screen.
+
+$Id: ANSI.py 491 2007-12-16 20:04:57Z noah $
+"""
+# references:
+#     http://www.retards.org/terminals/vt102.html
+#     http://vt100.net/docs/vt102-ug/contents.html
+#     http://vt100.net/docs/vt220-rm/
+#     http://www.termsys.demon.co.uk/vtansi.htm
+
+import screen
+import FSM
+import copy
+import string
+
+def Emit (fsm):
+
+    screen = fsm.memory[0]
+    screen.write_ch(fsm.input_symbol)
+
+def StartNumber (fsm):
+
+    fsm.memory.append (fsm.input_symbol)
+
+def BuildNumber (fsm):
+
+    ns = fsm.memory.pop()
+    ns = ns + fsm.input_symbol
+    fsm.memory.append (ns)
+
+def DoBackOne (fsm):
+
+    screen = fsm.memory[0]
+    screen.cursor_back ()
+
+def DoBack (fsm):
+
+    count = int(fsm.memory.pop())
+    screen = fsm.memory[0]
+    screen.cursor_back (count)
+
+def DoDownOne (fsm):
+
+    screen = fsm.memory[0]
+    screen.cursor_down ()
+
+def DoDown (fsm):
+
+    count = int(fsm.memory.pop())
+    screen = fsm.memory[0]
+    screen.cursor_down (count)
+
+def DoForwardOne (fsm):
+
+    screen = fsm.memory[0]
+    screen.cursor_forward ()
+
+def DoForward (fsm):
+
+    count = int(fsm.memory.pop())
+    screen = fsm.memory[0]
+    screen.cursor_forward (count)
+
+def DoUpReverse (fsm):
+
+    screen = fsm.memory[0]
+    screen.cursor_up_reverse()
+
+def DoUpOne (fsm):
+
+    screen = fsm.memory[0]
+    screen.cursor_up ()
+
+def DoUp (fsm):
+
+    count = int(fsm.memory.pop())
+    screen = fsm.memory[0]
+    screen.cursor_up (count)
+
+def DoHome (fsm):
+
+    c = int(fsm.memory.pop())
+    r = int(fsm.memory.pop())
+    screen = fsm.memory[0]
+    screen.cursor_home (r,c)
+
+def DoHomeOrigin (fsm):
+
+    c = 1
+    r = 1
+    screen = fsm.memory[0]
+    screen.cursor_home (r,c)
+
+def DoEraseDown (fsm):
+
+    screen = fsm.memory[0]
+    screen.erase_down()
+
+def DoErase (fsm):
+
+    arg = int(fsm.memory.pop())
+    screen = fsm.memory[0]
+    if arg == 0:
+        screen.erase_down()
+    elif arg == 1:
+        screen.erase_up()
+    elif arg == 2:
+        screen.erase_screen()
+
+def DoEraseEndOfLine (fsm):
+
+    screen = fsm.memory[0]
+    screen.erase_end_of_line()
+
+def DoEraseLine (fsm):
+
+    screen = fsm.memory[0]
+    if arg == 0:
+        screen.end_of_line()
+    elif arg == 1:
+        screen.start_of_line()
+    elif arg == 2:
+        screen.erase_line()
+
+def DoEnableScroll (fsm):
+
+    screen = fsm.memory[0]
+    screen.scroll_screen()
+
+def DoCursorSave (fsm):
+
+    screen = fsm.memory[0]
+    screen.cursor_save_attrs()
+
+def DoCursorRestore (fsm):
+
+    screen = fsm.memory[0]
+    screen.cursor_restore_attrs()
+
+def DoScrollRegion (fsm):
+
+    screen = fsm.memory[0]
+    r2 = int(fsm.memory.pop())
+    r1 = int(fsm.memory.pop())
+    screen.scroll_screen_rows (r1,r2)
+
+def DoMode (fsm):
+
+    screen = fsm.memory[0]
+    mode = fsm.memory.pop() # Should be 4
+    # screen.setReplaceMode ()
+
+def Log (fsm):
+
+    screen = fsm.memory[0]
+    fsm.memory = [screen]
+    fout = open ('log', 'a')
+    fout.write (fsm.input_symbol + ',' + fsm.current_state + '\n')
+    fout.close()
+
+class term (screen.screen):
+    """This is a placeholder. 
+    In theory I might want to add other terminal types.
+    """
+    def __init__ (self, r=24, c=80):
+        screen.screen.__init__(self, r,c)
+
+class ANSI (term):
+
+    """This class encapsulates a generic terminal. It filters a stream and
+    maintains the state of a screen object. """
+
+    def __init__ (self, r=24,c=80):
+
+        term.__init__(self,r,c)
+
+        #self.screen = screen (24,80)
+        self.state = FSM.FSM ('INIT',[self])
+        self.state.set_default_transition (Log, 'INIT')
+        self.state.add_transition_any ('INIT', Emit, 'INIT')
+        self.state.add_transition ('\x1b', 'INIT', None, 'ESC')
+        self.state.add_transition_any ('ESC', Log, 'INIT')
+        self.state.add_transition ('(', 'ESC', None, 'G0SCS')
+        self.state.add_transition (')', 'ESC', None, 'G1SCS')
+        self.state.add_transition_list ('AB012', 'G0SCS', None, 'INIT')
+        self.state.add_transition_list ('AB012', 'G1SCS', None, 'INIT')
+        self.state.add_transition ('7', 'ESC', DoCursorSave, 'INIT')
+        self.state.add_transition ('8', 'ESC', DoCursorRestore, 'INIT')
+        self.state.add_transition ('M', 'ESC', DoUpReverse, 'INIT')
+        self.state.add_transition ('>', 'ESC', DoUpReverse, 'INIT')
+        self.state.add_transition ('<', 'ESC', DoUpReverse, 'INIT')
+        self.state.add_transition ('=', 'ESC', None, 'INIT') # Selects application keypad.
+        self.state.add_transition ('#', 'ESC', None, 'GRAPHICS_POUND')
+        self.state.add_transition_any ('GRAPHICS_POUND', None, 'INIT')
+        self.state.add_transition ('[', 'ESC', None, 'ELB')
+        # ELB means Escape Left Bracket. That is ^[[
+        self.state.add_transition ('H', 'ELB', DoHomeOrigin, 'INIT')
+        self.state.add_transition ('D', 'ELB', DoBackOne, 'INIT')
+        self.state.add_transition ('B', 'ELB', DoDownOne, 'INIT')
+        self.state.add_transition ('C', 'ELB', DoForwardOne, 'INIT')
+        self.state.add_transition ('A', 'ELB', DoUpOne, 'INIT')
+        self.state.add_transition ('J', 'ELB', DoEraseDown, 'INIT')
+        self.state.add_transition ('K', 'ELB', DoEraseEndOfLine, 'INIT')
+        self.state.add_transition ('r', 'ELB', DoEnableScroll, 'INIT')
+        self.state.add_transition ('m', 'ELB', None, 'INIT')
+        self.state.add_transition ('?', 'ELB', None, 'MODECRAP')
+        self.state.add_transition_list (string.digits, 'ELB', StartNumber, 'NUMBER_1')
+        self.state.add_transition_list (string.digits, 'NUMBER_1', BuildNumber, 'NUMBER_1')
+        self.state.add_transition ('D', 'NUMBER_1', DoBack, 'INIT')
+        self.state.add_transition ('B', 'NUMBER_1', DoDown, 'INIT')
+        self.state.add_transition ('C', 'NUMBER_1', DoForward, 'INIT')
+        self.state.add_transition ('A', 'NUMBER_1', DoUp, 'INIT')
+        self.state.add_transition ('J', 'NUMBER_1', DoErase, 'INIT')
+        self.state.add_transition ('K', 'NUMBER_1', DoEraseLine, 'INIT')
+        self.state.add_transition ('l', 'NUMBER_1', DoMode, 'INIT')
+        ### It gets worse... the 'm' code can have infinite number of
+        ### number;number;number before it. I've never seen more than two,
+        ### but the specs say it's allowed. crap!
+        self.state.add_transition ('m', 'NUMBER_1', None, 'INIT')
+        ### LED control. Same problem as 'm' code.
+        self.state.add_transition ('q', 'NUMBER_1', None, 'INIT') 
+        
+        # \E[?47h appears to be "switch to alternate screen"
+        # \E[?47l restores alternate screen... I think.
+        self.state.add_transition_list (string.digits, 'MODECRAP', StartNumber, 'MODECRAP_NUM')
+        self.state.add_transition_list (string.digits, 'MODECRAP_NUM', BuildNumber, 'MODECRAP_NUM')
+        self.state.add_transition ('l', 'MODECRAP_NUM', None, 'INIT')
+        self.state.add_transition ('h', 'MODECRAP_NUM', None, 'INIT')
+
+#RM   Reset Mode                Esc [ Ps l                   none
+        self.state.add_transition (';', 'NUMBER_1', None, 'SEMICOLON')
+        self.state.add_transition_any ('SEMICOLON', Log, 'INIT')
+        self.state.add_transition_list (string.digits, 'SEMICOLON', StartNumber, 'NUMBER_2')
+        self.state.add_transition_list (string.digits, 'NUMBER_2', BuildNumber, 'NUMBER_2')
+        self.state.add_transition_any ('NUMBER_2', Log, 'INIT')
+        self.state.add_transition ('H', 'NUMBER_2', DoHome, 'INIT')
+        self.state.add_transition ('f', 'NUMBER_2', DoHome, 'INIT')
+        self.state.add_transition ('r', 'NUMBER_2', DoScrollRegion, 'INIT')
+        ### It gets worse... the 'm' code can have infinite number of
+        ### number;number;number before it. I've never seen more than two,
+        ### but the specs say it's allowed. crap!
+        self.state.add_transition ('m', 'NUMBER_2', None, 'INIT')
+        ### LED control. Same problem as 'm' code.
+        self.state.add_transition ('q', 'NUMBER_2', None, 'INIT') 
+
+    def process (self, c):
+
+        self.state.process(c)
+
+    def process_list (self, l):
+
+        self.write(l)
+
+    def write (self, s):
+
+        for c in s:
+            self.process(c)
+
+    def flush (self):
+
+        pass
+
+    def write_ch (self, ch):
+
+        """This puts a character at the current cursor position. cursor
+        position if moved forward with wrap-around, but no scrolling is done if
+        the cursor hits the lower-right corner of the screen. """
+
+        #\r and \n both produce a call to crlf().
+        ch = ch[0]
+
+        if ch == '\r':
+        #    self.crlf()
+            return
+        if ch == '\n':
+            self.crlf()
+            return
+        if ch == chr(screen.BS):
+            self.cursor_back()
+            self.put_abs(self.cur_r, self.cur_c, ' ')
+            return
+
+        if ch not in string.printable:
+            fout = open ('log', 'a')
+            fout.write ('Nonprint: ' + str(ord(ch)) + '\n')
+            fout.close()
+            return
+        self.put_abs(self.cur_r, self.cur_c, ch)
+        old_r = self.cur_r
+        old_c = self.cur_c
+        self.cursor_forward()
+        if old_c == self.cur_c:
+            self.cursor_down()
+            if old_r != self.cur_r:
+                self.cursor_home (self.cur_r, 1)
+            else:
+                self.scroll_up ()
+                self.cursor_home (self.cur_r, 1)
+                self.erase_line()
+
+#    def test (self):
+#
+#        import sys
+#        write_text = 'I\'ve got a ferret sticking up my nose.\n' + \
+#        '(He\'s got a ferret sticking up his nose.)\n' + \
+#        'How it got there I can\'t tell\n' + \
+#        'But now it\'s there it hurts like hell\n' + \
+#        'And what is more it radically affects my sense of smell.\n' + \
+#        '(His sense of smell.)\n' + \
+#        'I can see a bare-bottomed mandril.\n' + \
+#        '(Slyly eyeing his other nostril.)\n' + \
+#        'If it jumps inside there too I really don\'t know what to do\n' + \
+#        'I\'ll be the proud posessor of a kind of nasal zoo.\n' + \
+#        '(A nasal zoo.)\n' + \
+#        'I\'ve got a ferret sticking up my nose.\n' + \
+#        '(And what is worst of all it constantly explodes.)\n' + \
+#        '"Ferrets don\'t explode," you say\n' + \
+#        'But it happened nine times yesterday\n' + \
+#        'And I should know for each time I was standing in the way.\n' + \
+#        'I\'ve got a ferret sticking up my nose.\n' + \
+#        '(He\'s got a ferret sticking up his nose.)\n' + \
+#        'How it got there I can\'t tell\n' + \
+#        'But now it\'s there it hurts like hell\n' + \
+#        'And what is more it radically affects my sense of smell.\n' + \
+#        '(His sense of smell.)'
+#        self.fill('.')
+#        self.cursor_home()
+#        for c in write_text:
+#            self.write_ch (c)
+#        print str(self)
+#
+#if __name__ == '__main__':
+#    t = ANSI(6,65)
+#    t.test()
diff --git a/third_party/pexpect/FSM.py b/third_party/pexpect/FSM.py
new file mode 100755
index 0000000..751eb37
--- /dev/null
+++ b/third_party/pexpect/FSM.py
@@ -0,0 +1,331 @@
+#!/usr/bin/env python
+
+"""This module implements a Finite State Machine (FSM). In addition to state
+this FSM also maintains a user defined "memory". So this FSM can be used as a
+Push-down Automata (PDA) since a PDA is a FSM + memory.
+
+The following describes how the FSM works, but you will probably also need to
+see the example function to understand how the FSM is used in practice.
+
+You define an FSM by building tables of transitions. For a given input symbol
+the process() method uses these tables to decide what action to call and what
+the next state will be. The FSM has a table of transitions that associate:
+
+        (input_symbol, current_state) --> (action, next_state)
+
+Where "action" is a function you define. The symbols and states can be any
+objects. You use the add_transition() and add_transition_list() methods to add
+to the transition table. The FSM also has a table of transitions that
+associate:
+
+        (current_state) --> (action, next_state)
+
+You use the add_transition_any() method to add to this transition table. The
+FSM also has one default transition that is not associated with any specific
+input_symbol or state. You use the set_default_transition() method to set the
+default transition.
+
+When an action function is called it is passed a reference to the FSM. The
+action function may then access attributes of the FSM such as input_symbol,
+current_state, or "memory". The "memory" attribute can be any object that you
+want to pass along to the action functions. It is not used by the FSM itself.
+For parsing you would typically pass a list to be used as a stack.
+
+The processing sequence is as follows. The process() method is given an
+input_symbol to process. The FSM will search the table of transitions that
+associate:
+
+        (input_symbol, current_state) --> (action, next_state)
+
+If the pair (input_symbol, current_state) is found then process() will call the
+associated action function and then set the current state to the next_state.
+
+If the FSM cannot find a match for (input_symbol, current_state) it will then
+search the table of transitions that associate:
+
+        (current_state) --> (action, next_state)
+
+If the current_state is found then the process() method will call the
+associated action function and then set the current state to the next_state.
+Notice that this table lacks an input_symbol. It lets you define transitions
+for a current_state and ANY input_symbol. Hence, it is called the "any" table.
+Remember, it is always checked after first searching the table for a specific
+(input_symbol, current_state).
+
+For the case where the FSM did not match either of the previous two cases the
+FSM will try to use the default transition. If the default transition is
+defined then the process() method will call the associated action function and
+then set the current state to the next_state. This lets you define a default
+transition as a catch-all case. You can think of it as an exception handler.
+There can be only one default transition.
+
+Finally, if none of the previous cases are defined for an input_symbol and
+current_state then the FSM will raise an exception. This may be desirable, but
+you can always prevent this just by defining a default transition.
+
+Noah Spurrier 20020822
+"""
+
+class ExceptionFSM(Exception):
+
+    """This is the FSM Exception class."""
+
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return `self.value`
+
+class FSM:
+
+    """This is a Finite State Machine (FSM).
+    """
+
+    def __init__(self, initial_state, memory=None):
+
+        """This creates the FSM. You set the initial state here. The "memory"
+        attribute is any object that you want to pass along to the action
+        functions. It is not used by the FSM. For parsing you would typically
+        pass a list to be used as a stack. """
+
+        # Map (input_symbol, current_state) --> (action, next_state).
+        self.state_transitions = {}
+        # Map (current_state) --> (action, next_state).
+        self.state_transitions_any = {}
+        self.default_transition = None
+
+        self.input_symbol = None
+        self.initial_state = initial_state
+        self.current_state = self.initial_state
+        self.next_state = None
+        self.action = None
+        self.memory = memory
+
+    def reset (self):
+
+        """This sets the current_state to the initial_state and sets
+        input_symbol to None. The initial state was set by the constructor
+        __init__(). """
+
+        self.current_state = self.initial_state
+        self.input_symbol = None
+
+    def add_transition (self, input_symbol, state, action=None, next_state=None):
+
+        """This adds a transition that associates:
+
+                (input_symbol, current_state) --> (action, next_state)
+
+        The action may be set to None in which case the process() method will
+        ignore the action and only set the next_state. The next_state may be
+        set to None in which case the current state will be unchanged.
+
+        You can also set transitions for a list of symbols by using
+        add_transition_list(). """
+
+        if next_state is None:
+            next_state = state
+        self.state_transitions[(input_symbol, state)] = (action, next_state)
+
+    def add_transition_list (self, list_input_symbols, state, action=None, next_state=None):
+
+        """This adds the same transition for a list of input symbols.
+        You can pass a list or a string. Note that it is handy to use
+        string.digits, string.whitespace, string.letters, etc. to add
+        transitions that match character classes.
+
+        The action may be set to None in which case the process() method will
+        ignore the action and only set the next_state. The next_state may be
+        set to None in which case the current state will be unchanged. """
+
+        if next_state is None:
+            next_state = state
+        for input_symbol in list_input_symbols:
+            self.add_transition (input_symbol, state, action, next_state)
+
+    def add_transition_any (self, state, action=None, next_state=None):
+
+        """This adds a transition that associates:
+
+                (current_state) --> (action, next_state)
+
+        That is, any input symbol will match the current state.
+        The process() method checks the "any" state associations after it first
+        checks for an exact match of (input_symbol, current_state).
+
+        The action may be set to None in which case the process() method will
+        ignore the action and only set the next_state. The next_state may be
+        set to None in which case the current state will be unchanged. """
+
+        if next_state is None:
+            next_state = state
+        self.state_transitions_any [state] = (action, next_state)
+
+    def set_default_transition (self, action, next_state):
+
+        """This sets the default transition. This defines an action and
+        next_state if the FSM cannot find the input symbol and the current
+        state in the transition list and if the FSM cannot find the
+        current_state in the transition_any list. This is useful as a final
+        fall-through state for catching errors and undefined states.
+
+        The default transition can be removed by setting the attribute
+        default_transition to None. """
+
+        self.default_transition = (action, next_state)
+
+    def get_transition (self, input_symbol, state):
+
+        """This returns (action, next state) given an input_symbol and state.
+        This does not modify the FSM state, so calling this method has no side
+        effects. Normally you do not call this method directly. It is called by
+        process().
+
+        The sequence of steps to check for a defined transition goes from the
+        most specific to the least specific.
+
+        1. Check state_transitions[] that match exactly the tuple,
+            (input_symbol, state)
+
+        2. Check state_transitions_any[] that match (state)
+            In other words, match a specific state and ANY input_symbol.
+
+        3. Check if the default_transition is defined.
+            This catches any input_symbol and any state.
+            This is a handler for errors, undefined states, or defaults.
+
+        4. No transition was defined. If we get here then raise an exception.
+        """
+
+        if self.state_transitions.has_key((input_symbol, state)):
+            return self.state_transitions[(input_symbol, state)]
+        elif self.state_transitions_any.has_key (state):
+            return self.state_transitions_any[state]
+        elif self.default_transition is not None:
+            return self.default_transition
+        else:
+            raise ExceptionFSM ('Transition is undefined: (%s, %s).' %
+                (str(input_symbol), str(state)) )
+
+    def process (self, input_symbol):
+
+        """This is the main method that you call to process input. This may
+        cause the FSM to change state and call an action. This method calls
+        get_transition() to find the action and next_state associated with the
+        input_symbol and current_state. If the action is None then the action
+        is not called and only the current state is changed. This method
+        processes one complete input symbol. You can process a list of symbols
+        (or a string) by calling process_list(). """
+
+        self.input_symbol = input_symbol
+        (self.action, self.next_state) = self.get_transition (self.input_symbol, self.current_state)
+        if self.action is not None:
+            self.action (self)
+        self.current_state = self.next_state
+        self.next_state = None
+
+    def process_list (self, input_symbols):
+
+        """This takes a list and sends each element to process(). The list may
+        be a string or any iterable object. """
+
+        for s in input_symbols:
+            self.process (s)
+
+##############################################################################
+# The following is an example that demonstrates the use of the FSM class to
+# process an RPN expression. Run this module from the command line. You will
+# get a prompt > for input. Enter an RPN Expression. Numbers may be integers.
+# Operators are * / + - Use the = sign to evaluate and print the expression.
+# For example: 
+#
+#    167 3 2 2 * * * 1 - =
+#
+# will print:
+#
+#    2003
+##############################################################################
+
+import sys, os, traceback, optparse, time, string
+
+#
+# These define the actions. 
+# Note that "memory" is a list being used as a stack.
+#
+
+def BeginBuildNumber (fsm):
+    fsm.memory.append (fsm.input_symbol)
+
+def BuildNumber (fsm):
+    s = fsm.memory.pop ()
+    s = s + fsm.input_symbol
+    fsm.memory.append (s)
+
+def EndBuildNumber (fsm):
+    s = fsm.memory.pop ()
+    fsm.memory.append (int(s))
+
+def DoOperator (fsm):
+    ar = fsm.memory.pop()
+    al = fsm.memory.pop()
+    if fsm.input_symbol == '+':
+        fsm.memory.append (al + ar)
+    elif fsm.input_symbol == '-':
+        fsm.memory.append (al - ar)
+    elif fsm.input_symbol == '*':
+        fsm.memory.append (al * ar)
+    elif fsm.input_symbol == '/':
+        fsm.memory.append (al / ar)
+
+def DoEqual (fsm):
+    print str(fsm.memory.pop())
+
+def Error (fsm):
+    print 'That does not compute.'
+    print str(fsm.input_symbol)
+
+def main():
+
+    """This is where the example starts and the FSM state transitions are
+    defined. Note that states are strings (such as 'INIT'). This is not
+    necessary, but it makes the example easier to read. """
+
+    f = FSM ('INIT', []) # "memory" will be used as a stack.
+    f.set_default_transition (Error, 'INIT')
+    f.add_transition_any  ('INIT', None, 'INIT')
+    f.add_transition      ('=',               'INIT',            DoEqual,          'INIT')
+    f.add_transition_list (string.digits,     'INIT',            BeginBuildNumber, 'BUILDING_NUMBER')
+    f.add_transition_list (string.digits,     'BUILDING_NUMBER', BuildNumber,      'BUILDING_NUMBER')
+    f.add_transition_list (string.whitespace, 'BUILDING_NUMBER', EndBuildNumber,   'INIT')
+    f.add_transition_list ('+-*/',            'INIT',            DoOperator,       'INIT')
+
+    print
+    print 'Enter an RPN Expression.'
+    print 'Numbers may be integers. Operators are * / + -'
+    print 'Use the = sign to evaluate and print the expression.'
+    print 'For example: '
+    print '    167 3 2 2 * * * 1 - ='
+    inputstr = raw_input ('> ')
+    f.process_list(inputstr)
+
+if __name__ == '__main__':
+    try:
+        start_time = time.time()
+        parser = optparse.OptionParser(formatter=optparse.TitledHelpFormatter(), usage=globals()['__doc__'], version='$Id: FSM.py 490 2007-12-07 15:46:24Z noah $')
+        parser.add_option ('-v', '--verbose', action='store_true', default=False, help='verbose output')
+        (options, args) = parser.parse_args()
+        if options.verbose: print time.asctime()
+        main()
+        if options.verbose: print time.asctime()
+        if options.verbose: print 'TOTAL TIME IN MINUTES:',
+        if options.verbose: print (time.time() - start_time) / 60.0
+        sys.exit(0)
+    except KeyboardInterrupt, e: # Ctrl-C
+        raise e
+    except SystemExit, e: # sys.exit()
+        raise e
+    except Exception, e:
+        print 'ERROR, UNEXPECTED EXCEPTION'
+        print str(e)
+        traceback.print_exc()
+        os._exit(1)
diff --git a/third_party/pexpect/LICENSE b/third_party/pexpect/LICENSE
new file mode 100644
index 0000000..e611443
--- /dev/null
+++ b/third_party/pexpect/LICENSE
@@ -0,0 +1,21 @@
+Free, open source, and all that good stuff.
+Pexpect Copyright (c) 2008 Noah Spurrier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.
+
diff --git a/third_party/pexpect/PKG-INFO b/third_party/pexpect/PKG-INFO
new file mode 100644
index 0000000..2a5c859
--- /dev/null
+++ b/third_party/pexpect/PKG-INFO
@@ -0,0 +1,10 @@
+Metadata-Version: 1.0
+Name: pexpect
+Version: 2.3
+Summary: Pexpect is a pure Python Expect. It allows easy control of other applications.
+Home-page: http://pexpect.sourceforge.net/
+Author: Noah Spurrier
+Author-email: noah@noah.org
+License: MIT license
+Description: UNKNOWN
+Platform: UNIX
diff --git a/third_party/pexpect/README b/third_party/pexpect/README
new file mode 100644
index 0000000..3101dc8
--- /dev/null
+++ b/third_party/pexpect/README
@@ -0,0 +1,45 @@
+Pexpect is a Pure Python Expect-like module
+
+Pexpect makes Python a better tool for controlling other applications.
+
+Pexpect is a pure Python module for spawning child applications; controlling
+them; and responding to expected patterns in their output. Pexpect works like
+Don Libes' Expect. Pexpect allows your script to spawn a child application and
+control it as if a human were typing commands.
+
+Pexpect can be used for automating interactive applications such as ssh, ftp,
+passwd, telnet, etc. It can be used to a automate setup scripts for
+duplicating software package installations on different servers. It can be
+used for automated software testing. Pexpect is in the spirit of Don Libes'
+Expect, but Pexpect is pure Python. Unlike other Expect-like modules for
+Python, Pexpect does not require TCL or Expect nor does it require C
+extensions to be compiled. It should work on any platform that supports the
+standard Python pty module. The Pexpect interface was designed to be easy to use.
+
+If you want to work with the development version of the source code then please
+read the DEVELOPERS document in the root of the source code tree.
+
+Free, open source, and all that good stuff.
+Pexpect Copyright (c) 2008 Noah Spurrier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Noah Spurrier
+http://pexpect.sourceforge.net/
+
diff --git a/third_party/pexpect/README.chromium b/third_party/pexpect/README.chromium
new file mode 100644
index 0000000..810cc7e
--- /dev/null
+++ b/third_party/pexpect/README.chromium
@@ -0,0 +1,15 @@
+Name: pexpect
+Short Name: pexpect
+URL: http://www.noah.org/python/pexpect/
+Version: 2.3
+Date: 2008-01-05
+Revision: r509
+License: MIT
+License File: LICENSE
+Security Critical: no
+
+Description:
+Pexpect is a pure Python module for spawning child applications; controlling them; and responding to expected patterns in their output.
+
+Local Modifications:
+Only the required files from pexpect-2.3 distribution have been added.
diff --git a/third_party/pexpect/fdpexpect.py b/third_party/pexpect/fdpexpect.py
new file mode 100644
index 0000000..0ece98e
--- /dev/null
+++ b/third_party/pexpect/fdpexpect.py
@@ -0,0 +1,82 @@
+"""This is like pexpect, but will work on any file descriptor that you pass it.
+So you are reponsible for opening and close the file descriptor.
+
+$Id: fdpexpect.py 505 2007-12-26 21:33:50Z noah $
+"""
+
+from pexpect import *
+import os
+
+__all__ = ['fdspawn']
+
+class fdspawn (spawn):
+
+    """This is like pexpect.spawn but allows you to supply your own open file
+    descriptor. For example, you could use it to read through a file looking
+    for patterns, or to control a modem or serial device. """
+
+    def __init__ (self, fd, args=[], timeout=30, maxread=2000, searchwindowsize=None, logfile=None):
+
+        """This takes a file descriptor (an int) or an object that support the
+        fileno() method (returning an int). All Python file-like objects
+        support fileno(). """
+
+        ### TODO: Add better handling of trying to use fdspawn in place of spawn
+        ### TODO: (overload to allow fdspawn to also handle commands as spawn does.
+
+        if type(fd) != type(0) and hasattr(fd, 'fileno'):
+            fd = fd.fileno()
+
+        if type(fd) != type(0):
+            raise ExceptionPexpect ('The fd argument is not an int. If this is a command string then maybe you want to use pexpect.spawn.')
+
+        try: # make sure fd is a valid file descriptor
+            os.fstat(fd)
+        except OSError:
+            raise ExceptionPexpect, 'The fd argument is not a valid file descriptor.'
+
+        self.args = None
+        self.command = None
+        spawn.__init__(self, None, args, timeout, maxread, searchwindowsize, logfile)
+        self.child_fd = fd
+        self.own_fd = False
+        self.closed = False
+        self.name = '<file descriptor %d>' % fd
+
+    def __del__ (self):
+
+        return
+
+    def close (self):
+
+        if self.child_fd == -1:
+            return
+        if self.own_fd:
+            self.close (self)
+        else:
+            self.flush()
+            os.close(self.child_fd)
+            self.child_fd = -1
+            self.closed = True
+
+    def isalive (self):
+
+        """This checks if the file descriptor is still valid. If os.fstat()
+        does not raise an exception then we assume it is alive. """
+
+        if self.child_fd == -1:
+            return False
+        try:
+            os.fstat(self.child_fd)
+            return True
+        except:
+            return False
+
+    def terminate (self, force=False):
+
+        raise ExceptionPexpect ('This method is not valid for file descriptors.')
+
+    def kill (self, sig):
+
+        return
+
diff --git a/third_party/pexpect/pexpect.py b/third_party/pexpect/pexpect.py
new file mode 100644
index 0000000..67c6389
--- /dev/null
+++ b/third_party/pexpect/pexpect.py
@@ -0,0 +1,1845 @@
+"""Pexpect is a Python module for spawning child applications and controlling
+them automatically. Pexpect can be used for automating interactive applications
+such as ssh, ftp, passwd, telnet, etc. It can be used to a automate setup
+scripts for duplicating software package installations on different servers. It
+can be used for automated software testing. Pexpect is in the spirit of Don
+Libes' Expect, but Pexpect is pure Python. Other Expect-like modules for Python
+require TCL and Expect or require C extensions to be compiled. Pexpect does not
+use C, Expect, or TCL extensions. It should work on any platform that supports
+the standard Python pty module. The Pexpect interface focuses on ease of use so
+that simple tasks are easy.
+
+There are two main interfaces to Pexpect -- the function, run() and the class,
+spawn. You can call the run() function to execute a command and return the
+output. This is a handy replacement for os.system().
+
+For example::
+
+    pexpect.run('ls -la')
+
+The more powerful interface is the spawn class. You can use this to spawn an
+external child command and then interact with the child by sending lines and
+expecting responses.
+
+For example::
+
+    child = pexpect.spawn('scp foo myname@host.example.com:.')
+    child.expect ('Password:')
+    child.sendline (mypassword)
+
+This works even for commands that ask for passwords or other input outside of
+the normal stdio streams.
+
+Credits: Noah Spurrier, Richard Holden, Marco Molteni, Kimberley Burchett,
+Robert Stone, Hartmut Goebel, Chad Schroeder, Erick Tryzelaar, Dave Kirby, Ids
+vander Molen, George Todd, Noel Taylor, Nicolas D. Cesar, Alexander Gattin,
+Geoffrey Marshall, Francisco Lourenco, Glen Mabey, Karthik Gurusamy, Fernando
+Perez, Corey Minyard, Jon Cohen, Guillaume Chazarain, Andrew Ryan, Nick
+Craig-Wood, Andrew Stone, Jorgen Grahn (Let me know if I forgot anyone.)
+
+Free, open source, and all that good stuff.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+Pexpect Copyright (c) 2008 Noah Spurrier
+http://pexpect.sourceforge.net/
+
+$Id: pexpect.py 507 2007-12-27 02:40:52Z noah $
+"""
+
+try:
+    import os, sys, time
+    import select
+    import string
+    import re
+    import struct
+    import resource
+    import types
+    import pty
+    import tty
+    import termios
+    import fcntl
+    import errno
+    import traceback
+    import signal
+except ImportError, e:
+    raise ImportError (str(e) + """
+
+A critical module was not found. Probably this operating system does not
+support it. Pexpect is intended for UNIX-like operating systems.""")
+
+__version__ = '2.3'
+__revision__ = '$Revision: 399 $'
+__all__ = ['ExceptionPexpect', 'EOF', 'TIMEOUT', 'spawn', 'run', 'which',
+    'split_command_line', '__version__', '__revision__']
+
+# Exception classes used by this module.
+class ExceptionPexpect(Exception):
+
+    """Base class for all exceptions raised by this module.
+    """
+
+    def __init__(self, value):
+
+        self.value = value
+
+    def __str__(self):
+
+        return str(self.value)
+
+    def get_trace(self):
+
+        """This returns an abbreviated stack trace with lines that only concern
+        the caller. In other words, the stack trace inside the Pexpect module
+        is not included. """
+
+        tblist = traceback.extract_tb(sys.exc_info()[2])
+        #tblist = filter(self.__filter_not_pexpect, tblist)
+        tblist = [item for item in tblist if self.__filter_not_pexpect(item)]
+        tblist = traceback.format_list(tblist)
+        return ''.join(tblist)
+
+    def __filter_not_pexpect(self, trace_list_item):
+
+        """This returns True if list item 0 the string 'pexpect.py' in it. """
+
+        if trace_list_item[0].find('pexpect.py') == -1:
+            return True
+        else:
+            return False
+
+class EOF(ExceptionPexpect):
+
+    """Raised when EOF is read from a child. This usually means the child has exited."""
+
+class TIMEOUT(ExceptionPexpect):
+
+    """Raised when a read time exceeds the timeout. """
+
+##class TIMEOUT_PATTERN(TIMEOUT):
+##    """Raised when the pattern match time exceeds the timeout.
+##    This is different than a read TIMEOUT because the child process may
+##    give output, thus never give a TIMEOUT, but the output
+##    may never match a pattern.
+##    """
+##class MAXBUFFER(ExceptionPexpect):
+##    """Raised when a scan buffer fills before matching an expected pattern."""
+
+def run (command, timeout=-1, withexitstatus=False, events=None, extra_args=None, logfile=None, cwd=None, env=None):
+
+    """
+    This function runs the given command; waits for it to finish; then
+    returns all output as a string. STDERR is included in output. If the full
+    path to the command is not given then the path is searched.
+
+    Note that lines are terminated by CR/LF (\\r\\n) combination even on
+    UNIX-like systems because this is the standard for pseudo ttys. If you set
+    'withexitstatus' to true, then run will return a tuple of (command_output,
+    exitstatus). If 'withexitstatus' is false then this returns just
+    command_output.
+
+    The run() function can often be used instead of creating a spawn instance.
+    For example, the following code uses spawn::
+
+        from pexpect import *
+        child = spawn('scp foo myname@host.example.com:.')
+        child.expect ('(?i)password')
+        child.sendline (mypassword)
+
+    The previous code can be replace with the following::
+
+        from pexpect import *
+        run ('scp foo myname@host.example.com:.', events={'(?i)password': mypassword})
+
+    Examples
+    ========
+
+    Start the apache daemon on the local machine::
+
+        from pexpect import *
+        run ("/usr/local/apache/bin/apachectl start")
+
+    Check in a file using SVN::
+
+        from pexpect import *
+        run ("svn ci -m 'automatic commit' my_file.py")
+
+    Run a command and capture exit status::
+
+        from pexpect import *
+        (command_output, exitstatus) = run ('ls -l /bin', withexitstatus=1)
+
+    Tricky Examples
+    ===============
+
+    The following will run SSH and execute 'ls -l' on the remote machine. The
+    password 'secret' will be sent if the '(?i)password' pattern is ever seen::
+
+        run ("ssh username@machine.example.com 'ls -l'", events={'(?i)password':'secret\\n'})
+
+    This will start mencoder to rip a video from DVD. This will also display
+    progress ticks every 5 seconds as it runs. For example::
+
+        from pexpect import *
+        def print_ticks(d):
+            print d['event_count'],
+        run ("mencoder dvd://1 -o video.avi -oac copy -ovc copy", events={TIMEOUT:print_ticks}, timeout=5)
+
+    The 'events' argument should be a dictionary of patterns and responses.
+    Whenever one of the patterns is seen in the command out run() will send the
+    associated response string. Note that you should put newlines in your
+    string if Enter is necessary. The responses may also contain callback
+    functions. Any callback is function that takes a dictionary as an argument.
+    The dictionary contains all the locals from the run() function, so you can
+    access the child spawn object or any other variable defined in run()
+    (event_count, child, and extra_args are the most useful). A callback may
+    return True to stop the current run process otherwise run() continues until
+    the next event. A callback may also return a string which will be sent to
+    the child. 'extra_args' is not used by directly run(). It provides a way to
+    pass data to a callback function through run() through the locals
+    dictionary passed to a callback. """
+
+    if timeout == -1:
+        child = spawn(command, maxread=2000, logfile=logfile, cwd=cwd, env=env)
+    else:
+        child = spawn(command, timeout=timeout, maxread=2000, logfile=logfile, cwd=cwd, env=env)
+    if events is not None:
+        patterns = events.keys()
+        responses = events.values()
+    else:
+        patterns=None # We assume that EOF or TIMEOUT will save us.
+        responses=None
+    child_result_list = []
+    event_count = 0
+    while 1:
+        try:
+            index = child.expect (patterns)
+            if type(child.after) in types.StringTypes:
+                child_result_list.append(child.before + child.after)
+            else: # child.after may have been a TIMEOUT or EOF, so don't cat those.
+                child_result_list.append(child.before)
+            if type(responses[index]) in types.StringTypes:
+                child.send(responses[index])
+            elif type(responses[index]) is types.FunctionType:
+                callback_result = responses[index](locals())
+                sys.stdout.flush()
+                if type(callback_result) in types.StringTypes:
+                    child.send(callback_result)
+                elif callback_result:
+                    break
+            else:
+                raise TypeError ('The callback must be a string or function type.')
+            event_count = event_count + 1
+        except TIMEOUT, e:
+            child_result_list.append(child.before)
+            break
+        except EOF, e:
+            child_result_list.append(child.before)
+            break
+    child_result = ''.join(child_result_list)
+    if withexitstatus:
+        child.close()
+        return (child_result, child.exitstatus)
+    else:
+        return child_result
+
+class spawn (object):
+
+    """This is the main class interface for Pexpect. Use this class to start
+    and control child applications. """
+
+    def __init__(self, command, args=[], timeout=30, maxread=2000, searchwindowsize=None, logfile=None, cwd=None, env=None):
+
+        """This is the constructor. The command parameter may be a string that
+        includes a command and any arguments to the command. For example::
+
+            child = pexpect.spawn ('/usr/bin/ftp')
+            child = pexpect.spawn ('/usr/bin/ssh user@example.com')
+            child = pexpect.spawn ('ls -latr /tmp')
+
+        You may also construct it with a list of arguments like so::
+
+            child = pexpect.spawn ('/usr/bin/ftp', [])
+            child = pexpect.spawn ('/usr/bin/ssh', ['user@example.com'])
+            child = pexpect.spawn ('ls', ['-latr', '/tmp'])
+
+        After this the child application will be created and will be ready to
+        talk to. For normal use, see expect() and send() and sendline().
+
+        Remember that Pexpect does NOT interpret shell meta characters such as
+        redirect, pipe, or wild cards (>, |, or *). This is a common mistake.
+        If you want to run a command and pipe it through another command then
+        you must also start a shell. For example::
+
+            child = pexpect.spawn('/bin/bash -c "ls -l | grep LOG > log_list.txt"')
+            child.expect(pexpect.EOF)
+
+        The second form of spawn (where you pass a list of arguments) is useful
+        in situations where you wish to spawn a command and pass it its own
+        argument list. This can make syntax more clear. For example, the
+        following is equivalent to the previous example::
+
+            shell_cmd = 'ls -l | grep LOG > log_list.txt'
+            child = pexpect.spawn('/bin/bash', ['-c', shell_cmd])
+            child.expect(pexpect.EOF)
+
+        The maxread attribute sets the read buffer size. This is maximum number
+        of bytes that Pexpect will try to read from a TTY at one time. Setting
+        the maxread size to 1 will turn off buffering. Setting the maxread
+        value higher may help performance in cases where large amounts of
+        output are read back from the child. This feature is useful in
+        conjunction with searchwindowsize.
+
+        The searchwindowsize attribute sets the how far back in the incomming
+        seach buffer Pexpect will search for pattern matches. Every time
+        Pexpect reads some data from the child it will append the data to the
+        incomming buffer. The default is to search from the beginning of the
+        imcomming buffer each time new data is read from the child. But this is
+        very inefficient if you are running a command that generates a large
+        amount of data where you want to match The searchwindowsize does not
+        effect the size of the incomming data buffer. You will still have
+        access to the full buffer after expect() returns.
+
+        The logfile member turns on or off logging. All input and output will
+        be copied to the given file object. Set logfile to None to stop
+        logging. This is the default. Set logfile to sys.stdout to echo
+        everything to standard output. The logfile is flushed after each write.
+
+        Example log input and output to a file::
+
+            child = pexpect.spawn('some_command')
+            fout = file('mylog.txt','w')
+            child.logfile = fout
+
+        Example log to stdout::
+
+            child = pexpect.spawn('some_command')
+            child.logfile = sys.stdout
+
+        The logfile_read and logfile_send members can be used to separately log
+        the input from the child and output sent to the child. Sometimes you
+        don't want to see everything you write to the child. You only want to
+        log what the child sends back. For example::
+        
+            child = pexpect.spawn('some_command')
+            child.logfile_read = sys.stdout
+
+        To separately log output sent to the child use logfile_send::
+        
+            self.logfile_send = fout
+
+        The delaybeforesend helps overcome a weird behavior that many users
+        were experiencing. The typical problem was that a user would expect() a
+        "Password:" prompt and then immediately call sendline() to send the
+        password. The user would then see that their password was echoed back
+        to them. Passwords don't normally echo. The problem is caused by the
+        fact that most applications print out the "Password" prompt and then
+        turn off stdin echo, but if you send your password before the
+        application turned off echo, then you get your password echoed.
+        Normally this wouldn't be a problem when interacting with a human at a
+        real keyboard. If you introduce a slight delay just before writing then
+        this seems to clear up the problem. This was such a common problem for
+        many users that I decided that the default pexpect behavior should be
+        to sleep just before writing to the child application. 1/20th of a
+        second (50 ms) seems to be enough to clear up the problem. You can set
+        delaybeforesend to 0 to return to the old behavior. Most Linux machines
+        don't like this to be below 0.03. I don't know why.
+
+        Note that spawn is clever about finding commands on your path.
+        It uses the same logic that "which" uses to find executables.
+
+        If you wish to get the exit status of the child you must call the
+        close() method. The exit or signal status of the child will be stored
+        in self.exitstatus or self.signalstatus. If the child exited normally
+        then exitstatus will store the exit return code and signalstatus will
+        be None. If the child was terminated abnormally with a signal then
+        signalstatus will store the signal value and exitstatus will be None.
+        If you need more detail you can also read the self.status member which
+        stores the status returned by os.waitpid. You can interpret this using
+        os.WIFEXITED/os.WEXITSTATUS or os.WIFSIGNALED/os.TERMSIG. """
+
+        self.STDIN_FILENO = pty.STDIN_FILENO
+        self.STDOUT_FILENO = pty.STDOUT_FILENO
+        self.STDERR_FILENO = pty.STDERR_FILENO
+        self.stdin = sys.stdin
+        self.stdout = sys.stdout
+        self.stderr = sys.stderr
+
+        self.searcher = None
+        self.ignorecase = False
+        self.before = None
+        self.after = None
+        self.match = None
+        self.match_index = None
+        self.terminated = True
+        self.exitstatus = None
+        self.signalstatus = None
+        self.status = None # status returned by os.waitpid
+        self.flag_eof = False
+        self.pid = None
+        self.child_fd = -1 # initially closed
+        self.timeout = timeout
+        self.delimiter = EOF
+        self.logfile = logfile
+        self.logfile_read = None # input from child (read_nonblocking)
+        self.logfile_send = None # output to send (send, sendline)
+        self.maxread = maxread # max bytes to read at one time into buffer
+        self.buffer = '' # This is the read buffer. See maxread.
+        self.searchwindowsize = searchwindowsize # Anything before searchwindowsize point is preserved, but not searched.
+        # Most Linux machines don't like delaybeforesend to be below 0.03 (30 ms).
+        self.delaybeforesend = 0.05 # Sets sleep time used just before sending data to child. Time in seconds.
+        self.delayafterclose = 0.1 # Sets delay in close() method to allow kernel time to update process status. Time in seconds.
+        self.delayafterterminate = 0.1 # Sets delay in terminate() method to allow kernel time to update process status. Time in seconds.
+        self.softspace = False # File-like object.
+        self.name = '<' + repr(self) + '>' # File-like object.
+        self.encoding = None # File-like object.
+        self.closed = True # File-like object.
+        self.cwd = cwd
+        self.env = env
+        self.__irix_hack = (sys.platform.lower().find('irix')>=0) # This flags if we are running on irix
+        # Solaris uses internal __fork_pty(). All others use pty.fork().
+        if (sys.platform.lower().find('solaris')>=0) or (sys.platform.lower().find('sunos5')>=0):
+            self.use_native_pty_fork = False
+        else:
+            self.use_native_pty_fork = True
+
+
+        # allow dummy instances for subclasses that may not use command or args.
+        if command is None:
+            self.command = None
+            self.args = None
+            self.name = '<pexpect factory incomplete>'
+        else:
+            self._spawn (command, args)
+
+    def __del__(self):
+
+        """This makes sure that no system resources are left open. Python only
+        garbage collects Python objects. OS file descriptors are not Python
+        objects, so they must be handled explicitly. If the child file
+        descriptor was opened outside of this class (passed to the constructor)
+        then this does not close it. """
+
+        if not self.closed:
+            # It is possible for __del__ methods to execute during the
+            # teardown of the Python VM itself. Thus self.close() may
+            # trigger an exception because os.close may be None.
+            # -- Fernando Perez
+            try:
+                self.close()
+            except AttributeError:
+                pass
+
+    def __str__(self):
+
+        """This returns a human-readable string that represents the state of
+        the object. """
+
+        s = []
+        s.append(repr(self))
+        s.append('version: ' + __version__ + ' (' + __revision__ + ')')
+        s.append('command: ' + str(self.command))
+        s.append('args: ' + str(self.args))
+        s.append('searcher: ' + str(self.searcher))
+        s.append('buffer (last 100 chars): ' + str(self.buffer)[-100:])
+        s.append('before (last 100 chars): ' + str(self.before)[-100:])
+        s.append('after: ' + str(self.after))
+        s.append('match: ' + str(self.match))
+        s.append('match_index: ' + str(self.match_index))
+        s.append('exitstatus: ' + str(self.exitstatus))
+        s.append('flag_eof: ' + str(self.flag_eof))
+        s.append('pid: ' + str(self.pid))
+        s.append('child_fd: ' + str(self.child_fd))
+        s.append('closed: ' + str(self.closed))
+        s.append('timeout: ' + str(self.timeout))
+        s.append('delimiter: ' + str(self.delimiter))
+        s.append('logfile: ' + str(self.logfile))
+        s.append('logfile_read: ' + str(self.logfile_read))
+        s.append('logfile_send: ' + str(self.logfile_send))
+        s.append('maxread: ' + str(self.maxread))
+        s.append('ignorecase: ' + str(self.ignorecase))
+        s.append('searchwindowsize: ' + str(self.searchwindowsize))
+        s.append('delaybeforesend: ' + str(self.delaybeforesend))
+        s.append('delayafterclose: ' + str(self.delayafterclose))
+        s.append('delayafterterminate: ' + str(self.delayafterterminate))
+        return '\n'.join(s)
+
+    def _spawn(self,command,args=[]):
+
+        """This starts the given command in a child process. This does all the
+        fork/exec type of stuff for a pty. This is called by __init__. If args
+        is empty then command will be parsed (split on spaces) and args will be
+        set to parsed arguments. """
+
+        # The pid and child_fd of this object get set by this method.
+        # Note that it is difficult for this method to fail.
+        # You cannot detect if the child process cannot start.
+        # So the only way you can tell if the child process started
+        # or not is to try to read from the file descriptor. If you get
+        # EOF immediately then it means that the child is already dead.
+        # That may not necessarily be bad because you may haved spawned a child
+        # that performs some task; creates no stdout output; and then dies.
+
+        # If command is an int type then it may represent a file descriptor.
+        if type(command) == type(0):
+            raise ExceptionPexpect ('Command is an int type. If this is a file descriptor then maybe you want to use fdpexpect.fdspawn which takes an existing file descriptor instead of a command string.')
+
+        if type (args) != type([]):
+            raise TypeError ('The argument, args, must be a list.')
+
+        if args == []:
+            self.args = split_command_line(command)
+            self.command = self.args[0]
+        else:
+            self.args = args[:] # work with a copy
+            self.args.insert (0, command)
+            self.command = command
+
+        command_with_path = which(self.command)
+        if command_with_path is None:
+            raise ExceptionPexpect ('The command was not found or was not executable: %s.' % self.command)
+        self.command = command_with_path
+        self.args[0] = self.command
+
+        self.name = '<' + ' '.join (self.args) + '>'
+
+        assert self.pid is None, 'The pid member should be None.'
+        assert self.command is not None, 'The command member should not be None.'
+
+        if self.use_native_pty_fork:
+            try:
+                self.pid, self.child_fd = pty.fork()
+            except OSError, e:
+                raise ExceptionPexpect('Error! pty.fork() failed: ' + str(e))
+        else: # Use internal __fork_pty
+            self.pid, self.child_fd = self.__fork_pty()
+
+        if self.pid == 0: # Child
+            try:
+                self.child_fd = sys.stdout.fileno() # used by setwinsize()
+                self.setwinsize(24, 80)
+            except:
+                # Some platforms do not like setwinsize (Cygwin).
+                # This will cause problem when running applications that
+                # are very picky about window size.
+                # This is a serious limitation, but not a show stopper.
+                pass
+            # Do not allow child to inherit open file descriptors from parent.
+            max_fd = resource.getrlimit(resource.RLIMIT_NOFILE)[0]
+            for i in range (3, max_fd):
+                try:
+                    os.close (i)
+                except OSError:
+                    pass
+
+            # I don't know why this works, but ignoring SIGHUP fixes a
+            # problem when trying to start a Java daemon with sudo
+            # (specifically, Tomcat).
+            signal.signal(signal.SIGHUP, signal.SIG_IGN)
+
+            if self.cwd is not None:
+                os.chdir(self.cwd)
+            if self.env is None:
+                os.execv(self.command, self.args)
+            else:
+                os.execvpe(self.command, self.args, self.env)
+
+        # Parent
+        self.terminated = False
+        self.closed = False
+
+    def __fork_pty(self):
+
+        """This implements a substitute for the forkpty system call. This
+        should be more portable than the pty.fork() function. Specifically,
+        this should work on Solaris.
+
+        Modified 10.06.05 by Geoff Marshall: Implemented __fork_pty() method to
+        resolve the issue with Python's pty.fork() not supporting Solaris,
+        particularly ssh. Based on patch to posixmodule.c authored by Noah
+        Spurrier::
+
+            http://mail.python.org/pipermail/python-dev/2003-May/035281.html
+
+        """
+
+        parent_fd, child_fd = os.openpty()
+        if parent_fd < 0 or child_fd < 0:
+            raise ExceptionPexpect, "Error! Could not open pty with os.openpty()."
+
+        pid = os.fork()
+        if pid < 0:
+            raise ExceptionPexpect, "Error! Failed os.fork()."
+        elif pid == 0:
+            # Child.
+            os.close(parent_fd)
+            self.__pty_make_controlling_tty(child_fd)
+
+            os.dup2(child_fd, 0)
+            os.dup2(child_fd, 1)
+            os.dup2(child_fd, 2)
+
+            if child_fd > 2:
+                os.close(child_fd)
+        else:
+            # Parent.
+            os.close(child_fd)
+
+        return pid, parent_fd
+
+    def __pty_make_controlling_tty(self, tty_fd):
+
+        """This makes the pseudo-terminal the controlling tty. This should be
+        more portable than the pty.fork() function. Specifically, this should
+        work on Solaris. """
+
+        child_name = os.ttyname(tty_fd)
+
+        # Disconnect from controlling tty if still connected.
+        fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY);
+        if fd >= 0:
+            os.close(fd)
+
+        os.setsid()
+
+        # Verify we are disconnected from controlling tty
+        try:
+            fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY);
+            if fd >= 0:
+                os.close(fd)
+                raise ExceptionPexpect, "Error! We are not disconnected from a controlling tty."
+        except:
+            # Good! We are disconnected from a controlling tty.
+            pass
+
+        # Verify we can open child pty.
+        fd = os.open(child_name, os.O_RDWR);
+        if fd < 0:
+            raise ExceptionPexpect, "Error! Could not open child pty, " + child_name
+        else:
+            os.close(fd)
+
+        # Verify we now have a controlling tty.
+        fd = os.open("/dev/tty", os.O_WRONLY)
+        if fd < 0:
+            raise ExceptionPexpect, "Error! Could not open controlling tty, /dev/tty"
+        else:
+            os.close(fd)
+
+    def fileno (self):   # File-like object.
+
+        """This returns the file descriptor of the pty for the child.
+        """
+
+        return self.child_fd
+
+    def close (self, force=True):   # File-like object.
+
+        """This closes the connection with the child application. Note that
+        calling close() more than once is valid. This emulates standard Python
+        behavior with files. Set force to True if you want to make sure that
+        the child is terminated (SIGKILL is sent if the child ignores SIGHUP
+        and SIGINT). """
+
+        if not self.closed:
+            self.flush()
+            os.close (self.child_fd)
+            time.sleep(self.delayafterclose) # Give kernel time to update process status.
+            if self.isalive():
+                if not self.terminate(force):
+                    raise ExceptionPexpect ('close() could not terminate the child using terminate()')
+            self.child_fd = -1
+            self.closed = True
+            #self.pid = None
+
+    def flush (self):   # File-like object.
+
+        """This does nothing. It is here to support the interface for a
+        File-like object. """
+
+        pass
+
+    def isatty (self):   # File-like object.
+
+        """This returns True if the file descriptor is open and connected to a
+        tty(-like) device, else False. """
+
+        return os.isatty(self.child_fd)
+
+    def waitnoecho (self, timeout=-1):
+
+        """This waits until the terminal ECHO flag is set False. This returns
+        True if the echo mode is off. This returns False if the ECHO flag was
+        not set False before the timeout. This can be used to detect when the
+        child is waiting for a password. Usually a child application will turn
+        off echo mode when it is waiting for the user to enter a password. For
+        example, instead of expecting the "password:" prompt you can wait for
+        the child to set ECHO off::
+
+            p = pexpect.spawn ('ssh user@example.com')
+            p.waitnoecho()
+            p.sendline(mypassword)
+
+        If timeout is None then this method to block forever until ECHO flag is
+        False.
+
+        """
+
+        if timeout == -1:
+            timeout = self.timeout
+        if timeout is not None:
+            end_time = time.time() + timeout 
+        while True:
+            if not self.getecho():
+                return True
+            if timeout < 0 and timeout is not None:
+                return False
+            if timeout is not None:
+                timeout = end_time - time.time()
+            time.sleep(0.1)
+
+    def getecho (self):
+
+        """This returns the terminal echo mode. This returns True if echo is
+        on or False if echo is off. Child applications that are expecting you
+        to enter a password often set ECHO False. See waitnoecho(). """
+
+        attr = termios.tcgetattr(self.child_fd)
+        if attr[3] & termios.ECHO:
+            return True
+        return False
+
+    def setecho (self, state):
+
+        """This sets the terminal echo mode on or off. Note that anything the
+        child sent before the echo will be lost, so you should be sure that
+        your input buffer is empty before you call setecho(). For example, the
+        following will work as expected::
+
+            p = pexpect.spawn('cat')
+            p.sendline ('1234') # We will see this twice (once from tty echo and again from cat).
+            p.expect (['1234'])
+            p.expect (['1234'])
+            p.setecho(False) # Turn off tty echo
+            p.sendline ('abcd') # We will set this only once (echoed by cat).
+            p.sendline ('wxyz') # We will set this only once (echoed by cat)
+            p.expect (['abcd'])
+            p.expect (['wxyz'])
+
+        The following WILL NOT WORK because the lines sent before the setecho
+        will be lost::
+
+            p = pexpect.spawn('cat')
+            p.sendline ('1234') # We will see this twice (once from tty echo and again from cat).
+            p.setecho(False) # Turn off tty echo
+            p.sendline ('abcd') # We will set this only once (echoed by cat).
+            p.sendline ('wxyz') # We will set this only once (echoed by cat)
+            p.expect (['1234'])
+            p.expect (['1234'])
+            p.expect (['abcd'])
+            p.expect (['wxyz'])
+        """
+
+        self.child_fd
+        attr = termios.tcgetattr(self.child_fd)
+        if state:
+            attr[3] = attr[3] | termios.ECHO
+        else:
+            attr[3] = attr[3] & ~termios.ECHO
+        # I tried TCSADRAIN and TCSAFLUSH, but these were inconsistent
+        # and blocked on some platforms. TCSADRAIN is probably ideal if it worked.
+        termios.tcsetattr(self.child_fd, termios.TCSANOW, attr)
+
+    def read_nonblocking (self, size = 1, timeout = -1):
+
+        """This reads at most size characters from the child application. It
+        includes a timeout. If the read does not complete within the timeout
+        period then a TIMEOUT exception is raised. If the end of file is read
+        then an EOF exception will be raised. If a log file was set using
+        setlog() then all data will also be written to the log file.
+
+        If timeout is None then the read may block indefinitely. If timeout is -1
+        then the self.timeout value is used. If timeout is 0 then the child is
+        polled and if there was no data immediately ready then this will raise
+        a TIMEOUT exception.
+
+        The timeout refers only to the amount of time to read at least one
+        character. This is not effected by the 'size' parameter, so if you call
+        read_nonblocking(size=100, timeout=30) and only one character is
+        available right away then one character will be returned immediately.
+        It will not wait for 30 seconds for another 99 characters to come in.
+
+        This is a wrapper around os.read(). It uses select.select() to
+        implement the timeout. """
+
+        if self.closed:
+            raise ValueError ('I/O operation on closed file in read_nonblocking().')
+
+        if timeout == -1:
+            timeout = self.timeout
+
+        # Note that some systems such as Solaris do not give an EOF when
+        # the child dies. In fact, you can still try to read
+        # from the child_fd -- it will block forever or until TIMEOUT.
+        # For this case, I test isalive() before doing any reading.
+        # If isalive() is false, then I pretend that this is the same as EOF.
+        if not self.isalive():
+            r,w,e = self.__select([self.child_fd], [], [], 0) # timeout of 0 means "poll"
+            if not r:
+                self.flag_eof = True
+                raise EOF ('End Of File (EOF) in read_nonblocking(). Braindead platform.')
+        elif self.__irix_hack:
+            # This is a hack for Irix. It seems that Irix requires a long delay before checking isalive.
+            # This adds a 2 second delay, but only when the child is terminated.
+            r, w, e = self.__select([self.child_fd], [], [], 2)
+            if not r and not self.isalive():
+                self.flag_eof = True
+                raise EOF ('End Of File (EOF) in read_nonblocking(). Pokey platform.')
+
+        r,w,e = self.__select([self.child_fd], [], [], timeout)
+
+        if not r:
+            if not self.isalive():
+                # Some platforms, such as Irix, will claim that their processes are alive;
+                # then timeout on the select; and then finally admit that they are not alive.
+                self.flag_eof = True
+                raise EOF ('End of File (EOF) in read_nonblocking(). Very pokey platform.')
+            else:
+                raise TIMEOUT ('Timeout exceeded in read_nonblocking().')
+
+        if self.child_fd in r:
+            try:
+                s = os.read(self.child_fd, size)
+            except OSError, e: # Linux does this
+                self.flag_eof = True
+                raise EOF ('End Of File (EOF) in read_nonblocking(). Exception style platform.')
+            if s == '': # BSD style
+                self.flag_eof = True
+                raise EOF ('End Of File (EOF) in read_nonblocking(). Empty string style platform.')
+
+            if self.logfile is not None:
+                self.logfile.write (s)
+                self.logfile.flush()
+            if self.logfile_read is not None:
+                self.logfile_read.write (s)
+                self.logfile_read.flush()
+
+            return s
+
+        raise ExceptionPexpect ('Reached an unexpected state in read_nonblocking().')
+
+    def read (self, size = -1):   # File-like object.
+
+        """This reads at most "size" bytes from the file (less if the read hits
+        EOF before obtaining size bytes). If the size argument is negative or
+        omitted, read all data until EOF is reached. The bytes are returned as
+        a string object. An empty string is returned when EOF is encountered
+        immediately. """
+
+        if size == 0:
+            return ''
+        if size < 0:
+            self.expect (self.delimiter) # delimiter default is EOF
+            return self.before
+
+        # I could have done this more directly by not using expect(), but
+        # I deliberately decided to couple read() to expect() so that
+        # I would catch any bugs early and ensure consistant behavior.
+        # It's a little less efficient, but there is less for me to
+        # worry about if I have to later modify read() or expect().
+        # Note, it's OK if size==-1 in the regex. That just means it
+        # will never match anything in which case we stop only on EOF.
+        cre = re.compile('.{%d}' % size, re.DOTALL)
+        index = self.expect ([cre, self.delimiter]) # delimiter default is EOF
+        if index == 0:
+            return self.after ### self.before should be ''. Should I assert this?
+        return self.before
+
+    def readline (self, size = -1):    # File-like object.
+
+        """This reads and returns one entire line. A trailing newline is kept
+        in the string, but may be absent when a file ends with an incomplete
+        line. Note: This readline() looks for a \\r\\n pair even on UNIX
+        because this is what the pseudo tty device returns. So contrary to what
+        you may expect you will receive the newline as \\r\\n. An empty string
+        is returned when EOF is hit immediately. Currently, the size argument is
+        mostly ignored, so this behavior is not standard for a file-like
+        object. If size is 0 then an empty string is returned. """
+
+        if size == 0:
+            return ''
+        index = self.expect (['\r\n', self.delimiter]) # delimiter default is EOF
+        if index == 0:
+            return self.before + '\r\n'
+        else:
+            return self.before
+
+    def __iter__ (self):    # File-like object.
+
+        """This is to support iterators over a file-like object.
+        """
+
+        return self
+
+    def next (self):    # File-like object.
+
+        """This is to support iterators over a file-like object.
+        """
+
+        result = self.readline()
+        if result == "":
+            raise StopIteration
+        return result
+
+    def readlines (self, sizehint = -1):    # File-like object.
+
+        """This reads until EOF using readline() and returns a list containing
+        the lines thus read. The optional "sizehint" argument is ignored. """
+
+        lines = []
+        while True:
+            line = self.readline()
+            if not line:
+                break
+            lines.append(line)
+        return lines
+
+    def write(self, s):   # File-like object.
+
+        """This is similar to send() except that there is no return value.
+        """
+
+        self.send (s)
+
+    def writelines (self, sequence):   # File-like object.
+
+        """This calls write() for each element in the sequence. The sequence
+        can be any iterable object producing strings, typically a list of
+        strings. This does not add line separators There is no return value.
+        """
+
+        for s in sequence:
+            self.write (s)
+
+    def send(self, s):
+
+        """This sends a string to the child process. This returns the number of
+        bytes written. If a log file was set then the data is also written to
+        the log. """
+
+        time.sleep(self.delaybeforesend)
+        if self.logfile is not None:
+            self.logfile.write (s)
+            self.logfile.flush()
+        if self.logfile_send is not None:
+            self.logfile_send.write (s)
+            self.logfile_send.flush()
+        c = os.write(self.child_fd, s)
+        return c
+
+    def sendline(self, s=''):
+
+        """This is like send(), but it adds a line feed (os.linesep). This
+        returns the number of bytes written. """
+
+        n = self.send(s)
+        n = n + self.send (os.linesep)
+        return n
+
+    def sendcontrol(self, char):
+
+        """This sends a control character to the child such as Ctrl-C or
+        Ctrl-D. For example, to send a Ctrl-G (ASCII 7)::
+
+            child.sendcontrol('g')
+
+        See also, sendintr() and sendeof().
+        """
+
+        char = char.lower()
+        a = ord(char)
+        if a>=97 and a<=122:
+            a = a - ord('a') + 1
+            return self.send (chr(a))
+        d = {'@':0, '`':0,
+            '[':27, '{':27,
+            '\\':28, '|':28,
+            ']':29, '}': 29,
+            '^':30, '~':30,
+            '_':31,
+            '?':127}
+        if char not in d:
+            return 0
+        return self.send (chr(d[char]))
+
+    def sendeof(self):
+
+        """This sends an EOF to the child. This sends a character which causes
+        the pending parent output buffer to be sent to the waiting child
+        program without waiting for end-of-line. If it is the first character
+        of the line, the read() in the user program returns 0, which signifies
+        end-of-file. This means to work as expected a sendeof() has to be
+        called at the beginning of a line. This method does not send a newline.
+        It is the responsibility of the caller to ensure the eof is sent at the
+        beginning of a line. """
+
+        ### Hmmm... how do I send an EOF?
+        ###C  if ((m = write(pty, *buf, p - *buf)) < 0)
+        ###C      return (errno == EWOULDBLOCK) ? n : -1;
+        #fd = sys.stdin.fileno()
+        #old = termios.tcgetattr(fd) # remember current state
+        #attr = termios.tcgetattr(fd)
+        #attr[3] = attr[3] | termios.ICANON # ICANON must be set to recognize EOF
+        #try: # use try/finally to ensure state gets restored
+        #    termios.tcsetattr(fd, termios.TCSADRAIN, attr)
+        #    if hasattr(termios, 'CEOF'):
+        #        os.write (self.child_fd, '%c' % termios.CEOF)
+        #    else:
+        #        # Silly platform does not define CEOF so assume CTRL-D
+        #        os.write (self.child_fd, '%c' % 4)
+        #finally: # restore state
+        #    termios.tcsetattr(fd, termios.TCSADRAIN, old)
+        if hasattr(termios, 'VEOF'):
+            char = termios.tcgetattr(self.child_fd)[6][termios.VEOF]
+        else:
+            # platform does not define VEOF so assume CTRL-D
+            char = chr(4)
+        self.send(char)
+
+    def sendintr(self):
+
+        """This sends a SIGINT to the child. It does not require
+        the SIGINT to be the first character on a line. """
+
+        if hasattr(termios, 'VINTR'):
+            char = termios.tcgetattr(self.child_fd)[6][termios.VINTR]
+        else:
+            # platform does not define VINTR so assume CTRL-C
+            char = chr(3)
+        self.send (char)
+
+    def eof (self):
+
+        """This returns True if the EOF exception was ever raised.
+        """
+
+        return self.flag_eof
+
+    def terminate(self, force=False):
+
+        """This forces a child process to terminate. It starts nicely with
+        SIGHUP and SIGINT. If "force" is True then moves onto SIGKILL. This
+        returns True if the child was terminated. This returns False if the
+        child could not be terminated. """
+
+        if not self.isalive():
+            return True
+        try:
+            self.kill(signal.SIGHUP)
+            time.sleep(self.delayafterterminate)
+            if not self.isalive():
+                return True
+            self.kill(signal.SIGCONT)
+            time.sleep(self.delayafterterminate)
+            if not self.isalive():
+                return True
+            self.kill(signal.SIGINT)
+            time.sleep(self.delayafterterminate)
+            if not self.isalive():
+                return True
+            if force:
+                self.kill(signal.SIGKILL)
+                time.sleep(self.delayafterterminate)
+                if not self.isalive():
+                    return True
+                else:
+                    return False
+            return False
+        except OSError, e:
+            # I think there are kernel timing issues that sometimes cause
+            # this to happen. I think isalive() reports True, but the
+            # process is dead to the kernel.
+            # Make one last attempt to see if the kernel is up to date.
+            time.sleep(self.delayafterterminate)
+            if not self.isalive():
+                return True
+            else:
+                return False
+
+    def wait(self):
+
+        """This waits until the child exits. This is a blocking call. This will
+        not read any data from the child, so this will block forever if the
+        child has unread output and has terminated. In other words, the child
+        may have printed output then called exit(); but, technically, the child
+        is still alive until its output is read. """
+
+        if self.isalive():
+            pid, status = os.waitpid(self.pid, 0)
+        else:
+            raise ExceptionPexpect ('Cannot wait for dead child process.')
+        self.exitstatus = os.WEXITSTATUS(status)
+        if os.WIFEXITED (status):
+            self.status = status
+            self.exitstatus = os.WEXITSTATUS(status)
+            self.signalstatus = None
+            self.terminated = True
+        elif os.WIFSIGNALED (status):
+            self.status = status
+            self.exitstatus = None
+            self.signalstatus = os.WTERMSIG(status)
+            self.terminated = True
+        elif os.WIFSTOPPED (status):
+            raise ExceptionPexpect ('Wait was called for a child process that is stopped. This is not supported. Is some other process attempting job control with our child pid?')
+        return self.exitstatus
+
+    def isalive(self):
+
+        """This tests if the child process is running or not. This is
+        non-blocking. If the child was terminated then this will read the
+        exitstatus or signalstatus of the child. This returns True if the child
+        process appears to be running or False if not. It can take literally
+        SECONDS for Solaris to return the right status. """
+
+        if self.terminated:
+            return False
+
+        if self.flag_eof:
+            # This is for Linux, which requires the blocking form of waitpid to get
+            # status of a defunct process. This is super-lame. The flag_eof would have
+            # been set in read_nonblocking(), so this should be safe.
+            waitpid_options = 0
+        else:
+            waitpid_options = os.WNOHANG
+
+        try:
+            pid, status = os.waitpid(self.pid, waitpid_options)
+        except OSError, e: # No child processes
+            if e[0] == errno.ECHILD:
+                raise ExceptionPexpect ('isalive() encountered condition where "terminated" is 0, but there was no child process. Did someone else call waitpid() on our process?')
+            else:
+                raise e
+
+        # I have to do this twice for Solaris. I can't even believe that I figured this out...
+        # If waitpid() returns 0 it means that no child process wishes to
+        # report, and the value of status is undefined.
+        if pid == 0:
+            try:
+                pid, status = os.waitpid(self.pid, waitpid_options) ### os.WNOHANG) # Solaris!
+            except OSError, e: # This should never happen...
+                if e[0] == errno.ECHILD:
+                    raise ExceptionPexpect ('isalive() encountered condition that should never happen. There was no child process. Did someone else call waitpid() on our process?')
+                else:
+                    raise e
+
+            # If pid is still 0 after two calls to waitpid() then
+            # the process really is alive. This seems to work on all platforms, except
+            # for Irix which seems to require a blocking call on waitpid or select, so I let read_nonblocking
+            # take care of this situation (unfortunately, this requires waiting through the timeout).
+            if pid == 0:
+                return True
+
+        if pid == 0:
+            return True
+
+        if os.WIFEXITED (status):
+            self.status = status
+            self.exitstatus = os.WEXITSTATUS(status)
+            self.signalstatus = None
+            self.terminated = True
+        elif os.WIFSIGNALED (status):
+            self.status = status
+            self.exitstatus = None
+            self.signalstatus = os.WTERMSIG(status)
+            self.terminated = True
+        elif os.WIFSTOPPED (status):
+            raise ExceptionPexpect ('isalive() encountered condition where child process is stopped. This is not supported. Is some other process attempting job control with our child pid?')
+        return False
+
+    def kill(self, sig):
+
+        """This sends the given signal to the child application. In keeping
+        with UNIX tradition it has a misleading name. It does not necessarily
+        kill the child unless you send the right signal. """
+
+        # Same as os.kill, but the pid is given for you.
+        if self.isalive():
+            os.kill(self.pid, sig)
+
+    def compile_pattern_list(self, patterns):
+
+        """This compiles a pattern-string or a list of pattern-strings.
+        Patterns must be a StringType, EOF, TIMEOUT, SRE_Pattern, or a list of
+        those. Patterns may also be None which results in an empty list (you
+        might do this if waiting for an EOF or TIMEOUT condition without
+        expecting any pattern).
+
+        This is used by expect() when calling expect_list(). Thus expect() is
+        nothing more than::
+
+             cpl = self.compile_pattern_list(pl)
+             return self.expect_list(cpl, timeout)
+
+        If you are using expect() within a loop it may be more
+        efficient to compile the patterns first and then call expect_list().
+        This avoid calls in a loop to compile_pattern_list()::
+
+             cpl = self.compile_pattern_list(my_pattern)
+             while some_condition:
+                ...
+                i = self.expect_list(clp, timeout)
+                ...
+        """
+
+        if patterns is None:
+            return []
+        if type(patterns) is not types.ListType:
+            patterns = [patterns]
+
+        compile_flags = re.DOTALL # Allow dot to match \n
+        if self.ignorecase:
+            compile_flags = compile_flags | re.IGNORECASE
+        compiled_pattern_list = []
+        for p in patterns:
+            if type(p) in types.StringTypes:
+                compiled_pattern_list.append(re.compile(p, compile_flags))
+            elif p is EOF:
+                compiled_pattern_list.append(EOF)
+            elif p is TIMEOUT:
+                compiled_pattern_list.append(TIMEOUT)
+            elif type(p) is type(re.compile('')):
+                compiled_pattern_list.append(p)
+            else:
+                raise TypeError ('Argument must be one of StringTypes, EOF, TIMEOUT, SRE_Pattern, or a list of those type. %s' % str(type(p)))
+
+        return compiled_pattern_list
+
+    def expect(self, pattern, timeout = -1, searchwindowsize=None):
+
+        """This seeks through the stream until a pattern is matched. The
+        pattern is overloaded and may take several types. The pattern can be a
+        StringType, EOF, a compiled re, or a list of any of those types.
+        Strings will be compiled to re types. This returns the index into the
+        pattern list. If the pattern was not a list this returns index 0 on a
+        successful match. This may raise exceptions for EOF or TIMEOUT. To
+        avoid the EOF or TIMEOUT exceptions add EOF or TIMEOUT to the pattern
+        list. That will cause expect to match an EOF or TIMEOUT condition
+        instead of raising an exception.
+
+        If you pass a list of patterns and more than one matches, the first match
+        in the stream is chosen. If more than one pattern matches at that point,
+        the leftmost in the pattern list is chosen. For example::
+
+            # the input is 'foobar'
+            index = p.expect (['bar', 'foo', 'foobar'])
+            # returns 1 ('foo') even though 'foobar' is a "better" match
+
+        Please note, however, that buffering can affect this behavior, since
+        input arrives in unpredictable chunks. For example::
+
+            # the input is 'foobar'
+            index = p.expect (['foobar', 'foo'])
+            # returns 0 ('foobar') if all input is available at once,
+            # but returs 1 ('foo') if parts of the final 'bar' arrive late
+
+        After a match is found the instance attributes 'before', 'after' and
+        'match' will be set. You can see all the data read before the match in
+        'before'. You can see the data that was matched in 'after'. The
+        re.MatchObject used in the re match will be in 'match'. If an error
+        occurred then 'before' will be set to all the data read so far and
+        'after' and 'match' will be None.
+
+        If timeout is -1 then timeout will be set to the self.timeout value.
+
+        A list entry may be EOF or TIMEOUT instead of a string. This will
+        catch these exceptions and return the index of the list entry instead
+        of raising the exception. The attribute 'after' will be set to the
+        exception type. The attribute 'match' will be None. This allows you to
+        write code like this::
+
+                index = p.expect (['good', 'bad', pexpect.EOF, pexpect.TIMEOUT])
+                if index == 0:
+                    do_something()
+                elif index == 1:
+                    do_something_else()
+                elif index == 2:
+                    do_some_other_thing()
+                elif index == 3:
+                    do_something_completely_different()
+
+        instead of code like this::
+
+                try:
+                    index = p.expect (['good', 'bad'])
+                    if index == 0:
+                        do_something()
+                    elif index == 1:
+                        do_something_else()
+                except EOF:
+                    do_some_other_thing()
+                except TIMEOUT:
+                    do_something_completely_different()
+
+        These two forms are equivalent. It all depends on what you want. You
+        can also just expect the EOF if you are waiting for all output of a
+        child to finish. For example::
+
+                p = pexpect.spawn('/bin/ls')
+                p.expect (pexpect.EOF)
+                print p.before
+
+        If you are trying to optimize for speed then see expect_list().
+        """
+
+        compiled_pattern_list = self.compile_pattern_list(pattern)
+        return self.expect_list(compiled_pattern_list, timeout, searchwindowsize)
+
+    def expect_list(self, pattern_list, timeout = -1, searchwindowsize = -1):
+
+        """This takes a list of compiled regular expressions and returns the
+        index into the pattern_list that matched the child output. The list may
+        also contain EOF or TIMEOUT (which are not compiled regular
+        expressions). This method is similar to the expect() method except that
+        expect_list() does not recompile the pattern list on every call. This
+        may help if you are trying to optimize for speed, otherwise just use
+        the expect() method.  This is called by expect(). If timeout==-1 then
+        the self.timeout value is used. If searchwindowsize==-1 then the
+        self.searchwindowsize value is used. """
+
+        return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize)
+
+    def expect_exact(self, pattern_list, timeout = -1, searchwindowsize = -1):
+
+        """This is similar to expect(), but uses plain string matching instead
+        of compiled regular expressions in 'pattern_list'. The 'pattern_list'
+        may be a string; a list or other sequence of strings; or TIMEOUT and
+        EOF.
+
+        This call might be faster than expect() for two reasons: string
+        searching is faster than RE matching and it is possible to limit the
+        search to just the end of the input buffer.
+
+        This method is also useful when you don't want to have to worry about
+        escaping regular expression characters that you want to match."""
+
+        if type(pattern_list) in types.StringTypes or pattern_list in (TIMEOUT, EOF):
+            pattern_list = [pattern_list]
+        return self.expect_loop(searcher_string(pattern_list), timeout, searchwindowsize)
+
+    def expect_loop(self, searcher, timeout = -1, searchwindowsize = -1):
+
+        """This is the common loop used inside expect. The 'searcher' should be
+        an instance of searcher_re or searcher_string, which describes how and what
+        to search for in the input.
+
+        See expect() for other arguments, return value and exceptions. """
+
+        self.searcher = searcher
+
+        if timeout == -1:
+            timeout = self.timeout
+        if timeout is not None:
+            end_time = time.time() + timeout 
+        if searchwindowsize == -1:
+            searchwindowsize = self.searchwindowsize
+
+        try:
+            incoming = self.buffer
+            freshlen = len(incoming)
+            while True: # Keep reading until exception or return.
+                index = searcher.search(incoming, freshlen, searchwindowsize)
+                if index >= 0:
+                    self.buffer = incoming[searcher.end : ]
+                    self.before = incoming[ : searcher.start]
+                    self.after = incoming[searcher.start : searcher.end]
+                    self.match = searcher.match
+                    self.match_index = index
+                    return self.match_index
+                # No match at this point
+                if timeout < 0 and timeout is not None:
+                    raise TIMEOUT ('Timeout exceeded in expect_any().')
+                # Still have time left, so read more data
+                c = self.read_nonblocking (self.maxread, timeout)
+                freshlen = len(c)
+                time.sleep (0.0001)
+                incoming = incoming + c
+                if timeout is not None:
+                    timeout = end_time - time.time()
+        except EOF, e:
+            self.buffer = ''
+            self.before = incoming
+            self.after = EOF
+            index = searcher.eof_index
+            if index >= 0:
+                self.match = EOF
+                self.match_index = index
+                return self.match_index
+            else:
+                self.match = None
+                self.match_index = None
+                raise EOF (str(e) + '\n' + str(self))
+        except TIMEOUT, e:
+            self.buffer = incoming
+            self.before = incoming
+            self.after = TIMEOUT
+            index = searcher.timeout_index
+            if index >= 0:
+                self.match = TIMEOUT
+                self.match_index = index
+                return self.match_index
+            else:
+                self.match = None
+                self.match_index = None
+                raise TIMEOUT (str(e) + '\n' + str(self))
+        except:
+            self.before = incoming
+            self.after = None
+            self.match = None
+            self.match_index = None
+            raise
+
+    def getwinsize(self):
+
+        """This returns the terminal window size of the child tty. The return
+        value is a tuple of (rows, cols). """
+
+        TIOCGWINSZ = getattr(termios, 'TIOCGWINSZ', 1074295912L)
+        s = struct.pack('HHHH', 0, 0, 0, 0)
+        x = fcntl.ioctl(self.fileno(), TIOCGWINSZ, s)
+        return struct.unpack('HHHH', x)[0:2]
+
+    def setwinsize(self, r, c):
+
+        """This sets the terminal window size of the child tty. This will cause
+        a SIGWINCH signal to be sent to the child. This does not change the
+        physical window size. It changes the size reported to TTY-aware
+        applications like vi or curses -- applications that respond to the
+        SIGWINCH signal. """
+
+        # Check for buggy platforms. Some Python versions on some platforms
+        # (notably OSF1 Alpha and RedHat 7.1) truncate the value for
+        # termios.TIOCSWINSZ. It is not clear why this happens.
+        # These platforms don't seem to handle the signed int very well;
+        # yet other platforms like OpenBSD have a large negative value for
+        # TIOCSWINSZ and they don't have a truncate problem.
+        # Newer versions of Linux have totally different values for TIOCSWINSZ.
+        # Note that this fix is a hack.
+        TIOCSWINSZ = getattr(termios, 'TIOCSWINSZ', -2146929561)
+        if TIOCSWINSZ == 2148037735L: # L is not required in Python >= 2.2.
+            TIOCSWINSZ = -2146929561 # Same bits, but with sign.
+        # Note, assume ws_xpixel and ws_ypixel are zero.
+        s = struct.pack('HHHH', r, c, 0, 0)
+        fcntl.ioctl(self.fileno(), TIOCSWINSZ, s)
+
+    def interact(self, escape_character = chr(29), input_filter = None, output_filter = None):
+
+        """This gives control of the child process to the interactive user (the
+        human at the keyboard). Keystrokes are sent to the child process, and
+        the stdout and stderr output of the child process is printed. This
+        simply echos the child stdout and child stderr to the real stdout and
+        it echos the real stdin to the child stdin. When the user types the
+        escape_character this method will stop. The default for
+        escape_character is ^]. This should not be confused with ASCII 27 --
+        the ESC character. ASCII 29 was chosen for historical merit because
+        this is the character used by 'telnet' as the escape character. The
+        escape_character will not be sent to the child process.
+
+        You may pass in optional input and output filter functions. These
+        functions should take a string and return a string. The output_filter
+        will be passed all the output from the child process. The input_filter
+        will be passed all the keyboard input from the user. The input_filter
+        is run BEFORE the check for the escape_character.
+
+        Note that if you change the window size of the parent the SIGWINCH
+        signal will not be passed through to the child. If you want the child
+        window size to change when the parent's window size changes then do
+        something like the following example::
+
+            import pexpect, struct, fcntl, termios, signal, sys
+            def sigwinch_passthrough (sig, data):
+                s = struct.pack("HHHH", 0, 0, 0, 0)
+                a = struct.unpack('hhhh', fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ , s))
+                global p
+                p.setwinsize(a[0],a[1])
+            p = pexpect.spawn('/bin/bash') # Note this is global and used in sigwinch_passthrough.
+            signal.signal(signal.SIGWINCH, sigwinch_passthrough)
+            p.interact()
+        """
+
+        # Flush the buffer.
+        self.stdout.write (self.buffer)
+        self.stdout.flush()
+        self.buffer = ''
+        mode = tty.tcgetattr(self.STDIN_FILENO)
+        tty.setraw(self.STDIN_FILENO)
+        try:
+            self.__interact_copy(escape_character, input_filter, output_filter)
+        finally:
+            tty.tcsetattr(self.STDIN_FILENO, tty.TCSAFLUSH, mode)
+
+    def __interact_writen(self, fd, data):
+
+        """This is used by the interact() method.
+        """
+
+        while data != '' and self.isalive():
+            n = os.write(fd, data)
+            data = data[n:]
+
+    def __interact_read(self, fd):
+
+        """This is used by the interact() method.
+        """
+
+        return os.read(fd, 1000)
+
+    def __interact_copy(self, escape_character = None, input_filter = None, output_filter = None):
+
+        """This is used by the interact() method.
+        """
+
+        while self.isalive():
+            r,w,e = self.__select([self.child_fd, self.STDIN_FILENO], [], [])
+            if self.child_fd in r:
+                data = self.__interact_read(self.child_fd)
+                if output_filter: data = output_filter(data)
+                if self.logfile is not None:
+                    self.logfile.write (data)
+                    self.logfile.flush()
+                os.write(self.STDOUT_FILENO, data)
+            if self.STDIN_FILENO in r:
+                data = self.__interact_read(self.STDIN_FILENO)
+                if input_filter: data = input_filter(data)
+                i = data.rfind(escape_character)
+                if i != -1:
+                    data = data[:i]
+                    self.__interact_writen(self.child_fd, data)
+                    break
+                self.__interact_writen(self.child_fd, data)
+
+    def __select (self, iwtd, owtd, ewtd, timeout=None):
+
+        """This is a wrapper around select.select() that ignores signals. If
+        select.select raises a select.error exception and errno is an EINTR
+        error then it is ignored. Mainly this is used to ignore sigwinch
+        (terminal resize). """
+
+        # if select() is interrupted by a signal (errno==EINTR) then
+        # we loop back and enter the select() again.
+        if timeout is not None:
+            end_time = time.time() + timeout
+        while True:
+            try:
+                return select.select (iwtd, owtd, ewtd, timeout)
+            except select.error, e:
+                if e[0] == errno.EINTR:
+                    # if we loop back we have to subtract the amount of time we already waited.
+                    if timeout is not None:
+                        timeout = end_time - time.time()
+                        if timeout < 0:
+                            return ([],[],[])
+                else: # something else caused the select.error, so this really is an exception
+                    raise
+
+##############################################################################
+# The following methods are no longer supported or allowed.
+
+    def setmaxread (self, maxread):
+
+        """This method is no longer supported or allowed. I don't like getters
+        and setters without a good reason. """
+
+        raise ExceptionPexpect ('This method is no longer supported or allowed. Just assign a value to the maxread member variable.')
+
+    def setlog (self, fileobject):
+
+        """This method is no longer supported or allowed.
+        """
+
+        raise ExceptionPexpect ('This method is no longer supported or allowed. Just assign a value to the logfile member variable.')
+
+##############################################################################
+# End of spawn class
+##############################################################################
+
+class searcher_string (object):
+
+    """This is a plain string search helper for the spawn.expect_any() method.
+
+    Attributes:
+
+        eof_index     - index of EOF, or -1
+        timeout_index - index of TIMEOUT, or -1
+
+    After a successful match by the search() method the following attributes
+    are available:
+
+        start - index into the buffer, first byte of match
+        end   - index into the buffer, first byte after match
+        match - the matching string itself
+    """
+
+    def __init__(self, strings):
+
+        """This creates an instance of searcher_string. This argument 'strings'
+        may be a list; a sequence of strings; or the EOF or TIMEOUT types. """
+
+        self.eof_index = -1
+        self.timeout_index = -1
+        self._strings = []
+        for n, s in zip(range(len(strings)), strings):
+            if s is EOF:
+                self.eof_index = n
+                continue
+            if s is TIMEOUT:
+                self.timeout_index = n
+                continue
+            self._strings.append((n, s))
+
+    def __str__(self):
+
+        """This returns a human-readable string that represents the state of
+        the object."""
+
+        ss =  [ (ns[0],'    %d: "%s"' % ns) for ns in self._strings ]
+        ss.append((-1,'searcher_string:'))
+        if self.eof_index >= 0:
+            ss.append ((self.eof_index,'    %d: EOF' % self.eof_index))
+        if self.timeout_index >= 0:
+            ss.append ((self.timeout_index,'    %d: TIMEOUT' % self.timeout_index))
+        ss.sort()
+        ss = zip(*ss)[1]
+        return '\n'.join(ss)
+
+    def search(self, buffer, freshlen, searchwindowsize=None):
+
+        """This searches 'buffer' for the first occurence of one of the search
+        strings.  'freshlen' must indicate the number of bytes at the end of
+        'buffer' which have not been searched before. It helps to avoid
+        searching the same, possibly big, buffer over and over again.
+
+        See class spawn for the 'searchwindowsize' argument.
+
+        If there is a match this returns the index of that string, and sets
+        'start', 'end' and 'match'. Otherwise, this returns -1. """
+
+        absurd_match = len(buffer)
+        first_match = absurd_match
+
+        # 'freshlen' helps a lot here. Further optimizations could
+        # possibly include:
+        #
+        # using something like the Boyer-Moore Fast String Searching
+        # Algorithm; pre-compiling the search through a list of
+        # strings into something that can scan the input once to
+        # search for all N strings; realize that if we search for
+        # ['bar', 'baz'] and the input is '...foo' we need not bother
+        # rescanning until we've read three more bytes.
+        #
+        # Sadly, I don't know enough about this interesting topic. /grahn
+        
+        for index, s in self._strings:
+            if searchwindowsize is None:
+                # the match, if any, can only be in the fresh data,
+                # or at the very end of the old data
+                offset = -(freshlen+len(s))
+            else:
+                # better obey searchwindowsize
+                offset = -searchwindowsize
+            n = buffer.find(s, offset)
+            if n >= 0 and n < first_match:
+                first_match = n
+                best_index, best_match = index, s
+        if first_match == absurd_match:
+            return -1
+        self.match = best_match
+        self.start = first_match
+        self.end = self.start + len(self.match)
+        return best_index
+
+class searcher_re (object):
+
+    """This is regular expression string search helper for the
+    spawn.expect_any() method.
+
+    Attributes:
+
+        eof_index     - index of EOF, or -1
+        timeout_index - index of TIMEOUT, or -1
+
+    After a successful match by the search() method the following attributes
+    are available:
+
+        start - index into the buffer, first byte of match
+        end   - index into the buffer, first byte after match
+        match - the re.match object returned by a succesful re.search
+
+    """
+
+    def __init__(self, patterns):
+
+        """This creates an instance that searches for 'patterns' Where
+        'patterns' may be a list or other sequence of compiled regular
+        expressions, or the EOF or TIMEOUT types."""
+
+        self.eof_index = -1
+        self.timeout_index = -1
+        self._searches = []
+        for n, s in zip(range(len(patterns)), patterns):
+            if s is EOF:
+                self.eof_index = n
+                continue
+            if s is TIMEOUT:
+                self.timeout_index = n
+                continue
+            self._searches.append((n, s))
+
+    def __str__(self):
+
+        """This returns a human-readable string that represents the state of
+        the object."""
+
+        ss =  [ (n,'    %d: re.compile("%s")' % (n,str(s.pattern))) for n,s in self._searches]
+        ss.append((-1,'searcher_re:'))
+        if self.eof_index >= 0:
+            ss.append ((self.eof_index,'    %d: EOF' % self.eof_index))
+        if self.timeout_index >= 0:
+            ss.append ((self.timeout_index,'    %d: TIMEOUT' % self.timeout_index))
+        ss.sort()
+        ss = zip(*ss)[1]
+        return '\n'.join(ss)
+
+    def search(self, buffer, freshlen, searchwindowsize=None):
+
+        """This searches 'buffer' for the first occurence of one of the regular
+        expressions. 'freshlen' must indicate the number of bytes at the end of
+        'buffer' which have not been searched before.
+
+        See class spawn for the 'searchwindowsize' argument.
+        
+        If there is a match this returns the index of that string, and sets
+        'start', 'end' and 'match'. Otherwise, returns -1."""
+
+        absurd_match = len(buffer)
+        first_match = absurd_match
+        # 'freshlen' doesn't help here -- we cannot predict the
+        # length of a match, and the re module provides no help.
+        if searchwindowsize is None:
+            searchstart = 0
+        else:
+            searchstart = max(0, len(buffer)-searchwindowsize)
+        for index, s in self._searches:
+            match = s.search(buffer, searchstart)
+            if match is None:
+                continue
+            n = match.start()
+            if n < first_match:
+                first_match = n
+                the_match = match
+                best_index = index
+        if first_match == absurd_match:
+            return -1
+        self.start = first_match
+        self.match = the_match
+        self.end = self.match.end()
+        return best_index
+
+def which (filename):
+
+    """This takes a given filename; tries to find it in the environment path;
+    then checks if it is executable. This returns the full path to the filename
+    if found and executable. Otherwise this returns None."""
+
+    # Special case where filename already contains a path.
+    if os.path.dirname(filename) != '':
+        if os.access (filename, os.X_OK):
+            return filename
+
+    if not os.environ.has_key('PATH') or os.environ['PATH'] == '':
+        p = os.defpath
+    else:
+        p = os.environ['PATH']
+
+    # Oddly enough this was the one line that made Pexpect
+    # incompatible with Python 1.5.2.
+    #pathlist = p.split (os.pathsep)
+    pathlist = string.split (p, os.pathsep)
+
+    for path in pathlist:
+        f = os.path.join(path, filename)
+        if os.access(f, os.X_OK):
+            return f
+    return None
+
+def split_command_line(command_line):
+
+    """This splits a command line into a list of arguments. It splits arguments
+    on spaces, but handles embedded quotes, doublequotes, and escaped
+    characters. It's impossible to do this with a regular expression, so I
+    wrote a little state machine to parse the command line. """
+
+    arg_list = []
+    arg = ''
+
+    # Constants to name the states we can be in.
+    state_basic = 0
+    state_esc = 1
+    state_singlequote = 2
+    state_doublequote = 3
+    state_whitespace = 4 # The state of consuming whitespace between commands.
+    state = state_basic
+
+    for c in command_line:
+        if state == state_basic or state == state_whitespace:
+            if c == '\\': # Escape the next character
+                state = state_esc
+            elif c == r"'": # Handle single quote
+                state = state_singlequote
+            elif c == r'"': # Handle double quote
+                state = state_doublequote
+            elif c.isspace():
+                # Add arg to arg_list if we aren't in the middle of whitespace.
+                if state == state_whitespace:
+                    None # Do nothing.
+                else:
+                    arg_list.append(arg)
+                    arg = ''
+                    state = state_whitespace
+            else:
+                arg = arg + c
+                state = state_basic
+        elif state == state_esc:
+            arg = arg + c
+            state = state_basic
+        elif state == state_singlequote:
+            if c == r"'":
+                state = state_basic
+            else:
+                arg = arg + c
+        elif state == state_doublequote:
+            if c == r'"':
+                state = state_basic
+            else:
+                arg = arg + c
+
+    if arg != '':
+        arg_list.append(arg)
+    return arg_list
+
+# vi:ts=4:sw=4:expandtab:ft=python:
diff --git a/third_party/pexpect/pxssh.py b/third_party/pexpect/pxssh.py
new file mode 100644
index 0000000..d3f46ab
--- /dev/null
+++ b/third_party/pexpect/pxssh.py
@@ -0,0 +1,307 @@
+"""This class extends pexpect.spawn to specialize setting up SSH connections.
+This adds methods for login, logout, and expecting the shell prompt.
+
+$Id: pxssh.py 487 2007-08-29 22:33:29Z noah $
+"""
+
+from pexpect import *
+import pexpect
+import time
+
+__all__ = ['ExceptionPxssh', 'pxssh']
+
+# Exception classes used by this module.
+class ExceptionPxssh(ExceptionPexpect):
+    """Raised for pxssh exceptions.
+    """
+
+class pxssh (spawn):
+
+    """This class extends pexpect.spawn to specialize setting up SSH
+    connections. This adds methods for login, logout, and expecting the shell
+    prompt. It does various tricky things to handle many situations in the SSH
+    login process. For example, if the session is your first login, then pxssh
+    automatically accepts the remote certificate; or if you have public key
+    authentication setup then pxssh won't wait for the password prompt.
+
+    pxssh uses the shell prompt to synchronize output from the remote host. In
+    order to make this more robust it sets the shell prompt to something more
+    unique than just $ or #. This should work on most Borne/Bash or Csh style
+    shells.
+
+    Example that runs a few commands on a remote server and prints the result::
+        
+        import pxssh
+        import getpass
+        try:                                                            
+            s = pxssh.pxssh()
+            hostname = raw_input('hostname: ')
+            username = raw_input('username: ')
+            password = getpass.getpass('password: ')
+            s.login (hostname, username, password)
+            s.sendline ('uptime')  # run a command
+            s.prompt()             # match the prompt
+            print s.before         # print everything before the prompt.
+            s.sendline ('ls -l')
+            s.prompt()
+            print s.before
+            s.sendline ('df')
+            s.prompt()
+            print s.before
+            s.logout()
+        except pxssh.ExceptionPxssh, e:
+            print "pxssh failed on login."
+            print str(e)
+
+    Note that if you have ssh-agent running while doing development with pxssh
+    then this can lead to a lot of confusion. Many X display managers (xdm,
+    gdm, kdm, etc.) will automatically start a GUI agent. You may see a GUI
+    dialog box popup asking for a password during development. You should turn
+    off any key agents during testing. The 'force_password' attribute will turn
+    off public key authentication. This will only work if the remote SSH server
+    is configured to allow password logins. Example of using 'force_password'
+    attribute::
+
+            s = pxssh.pxssh()
+            s.force_password = True
+            hostname = raw_input('hostname: ')
+            username = raw_input('username: ')
+            password = getpass.getpass('password: ')
+            s.login (hostname, username, password)
+    """
+
+    def __init__ (self, timeout=30, maxread=2000, searchwindowsize=None, logfile=None, cwd=None, env=None):
+        spawn.__init__(self, None, timeout=timeout, maxread=maxread, searchwindowsize=searchwindowsize, logfile=logfile, cwd=cwd, env=env)
+
+        self.name = '<pxssh>'
+        
+        #SUBTLE HACK ALERT! Note that the command to set the prompt uses a
+        #slightly different string than the regular expression to match it. This
+        #is because when you set the prompt the command will echo back, but we
+        #don't want to match the echoed command. So if we make the set command
+        #slightly different than the regex we eliminate the problem. To make the
+        #set command different we add a backslash in front of $. The $ doesn't
+        #need to be escaped, but it doesn't hurt and serves to make the set
+        #prompt command different than the regex.
+
+        # used to match the command-line prompt
+        self.UNIQUE_PROMPT = "\[PEXPECT\][\$\#] "
+        self.PROMPT = self.UNIQUE_PROMPT
+
+        # used to set shell command-line prompt to UNIQUE_PROMPT.
+        self.PROMPT_SET_SH = "PS1='[PEXPECT]\$ '"
+        self.PROMPT_SET_CSH = "set prompt='[PEXPECT]\$ '"
+        self.SSH_OPTS = "-o'RSAAuthentication=no' -o 'PubkeyAuthentication=no'"
+        # Disabling X11 forwarding gets rid of the annoying SSH_ASKPASS from
+        # displaying a GUI password dialog. I have not figured out how to
+        # disable only SSH_ASKPASS without also disabling X11 forwarding.
+        # Unsetting SSH_ASKPASS on the remote side doesn't disable it! Annoying!
+        #self.SSH_OPTS = "-x -o'RSAAuthentication=no' -o 'PubkeyAuthentication=no'"
+        self.force_password = False
+        self.auto_prompt_reset = True 
+
+    def levenshtein_distance(self, a,b):
+
+        """This calculates the Levenshtein distance between a and b.
+        """
+
+        n, m = len(a), len(b)
+        if n > m:
+            a,b = b,a
+            n,m = m,n
+        current = range(n+1)
+        for i in range(1,m+1):
+            previous, current = current, [i]+[0]*n
+            for j in range(1,n+1):
+                add, delete = previous[j]+1, current[j-1]+1
+                change = previous[j-1]
+                if a[j-1] != b[i-1]:
+                    change = change + 1
+                current[j] = min(add, delete, change)
+        return current[n]
+
+    def synch_original_prompt (self):
+
+        """This attempts to find the prompt. Basically, press enter and record
+        the response; press enter again and record the response; if the two
+        responses are similar then assume we are at the original prompt. """
+
+        # All of these timing pace values are magic.
+        # I came up with these based on what seemed reliable for
+        # connecting to a heavily loaded machine I have.
+        # If latency is worse than these values then this will fail.
+
+        self.read_nonblocking(size=10000,timeout=1) # GAS: Clear out the cache before getting the prompt
+        time.sleep(0.1)
+        self.sendline()
+        time.sleep(0.5)
+        x = self.read_nonblocking(size=1000,timeout=1)
+        time.sleep(0.1)
+        self.sendline()
+        time.sleep(0.5)
+        a = self.read_nonblocking(size=1000,timeout=1)
+        time.sleep(0.1)
+        self.sendline()
+        time.sleep(0.5)
+        b = self.read_nonblocking(size=1000,timeout=1)
+        ld = self.levenshtein_distance(a,b)
+        len_a = len(a)
+        if len_a == 0:
+            return False
+        if float(ld)/len_a < 0.4:
+            return True
+        return False
+
+    ### TODO: This is getting messy and I'm pretty sure this isn't perfect.
+    ### TODO: I need to draw a flow chart for this.
+    def login (self,server,username,password='',terminal_type='ansi',original_prompt=r"[#$]",login_timeout=10,port=None,auto_prompt_reset=True):
+
+        """This logs the user into the given server. It uses the
+        'original_prompt' to try to find the prompt right after login. When it
+        finds the prompt it immediately tries to reset the prompt to something
+        more easily matched. The default 'original_prompt' is very optimistic
+        and is easily fooled. It's more reliable to try to match the original
+        prompt as exactly as possible to prevent false matches by server
+        strings such as the "Message Of The Day". On many systems you can
+        disable the MOTD on the remote server by creating a zero-length file
+        called "~/.hushlogin" on the remote server. If a prompt cannot be found
+        then this will not necessarily cause the login to fail. In the case of
+        a timeout when looking for the prompt we assume that the original
+        prompt was so weird that we could not match it, so we use a few tricks
+        to guess when we have reached the prompt. Then we hope for the best and
+        blindly try to reset the prompt to something more unique. If that fails
+        then login() raises an ExceptionPxssh exception.
+        
+        In some situations it is not possible or desirable to reset the
+        original prompt. In this case, set 'auto_prompt_reset' to False to
+        inhibit setting the prompt to the UNIQUE_PROMPT. Remember that pxssh
+        uses a unique prompt in the prompt() method. If the original prompt is
+        not reset then this will disable the prompt() method unless you
+        manually set the PROMPT attribute. """
+
+        ssh_options = '-q'
+        if self.force_password:
+            ssh_options = ssh_options + ' ' + self.SSH_OPTS
+        if port is not None:
+            ssh_options = ssh_options + ' -p %s'%(str(port))
+        cmd = "ssh %s -l %s %s" % (ssh_options, username, server)
+
+        # This does not distinguish between a remote server 'password' prompt
+        # and a local ssh 'passphrase' prompt (for unlocking a private key).
+        spawn._spawn(self, cmd)
+        i = self.expect(["(?i)are you sure you want to continue connecting", original_prompt, "(?i)(?:password)|(?:passphrase for key)", "(?i)permission denied", "(?i)terminal type", TIMEOUT, "(?i)connection closed by remote host"], timeout=login_timeout)
+
+        # First phase
+        if i==0: 
+            # New certificate -- always accept it.
+            # This is what you get if SSH does not have the remote host's
+            # public key stored in the 'known_hosts' cache.
+            self.sendline("yes")
+            i = self.expect(["(?i)are you sure you want to continue connecting", original_prompt, "(?i)(?:password)|(?:passphrase for key)", "(?i)permission denied", "(?i)terminal type", TIMEOUT])
+        if i==2: # password or passphrase
+            self.sendline(password)
+            i = self.expect(["(?i)are you sure you want to continue connecting", original_prompt, "(?i)(?:password)|(?:passphrase for key)", "(?i)permission denied", "(?i)terminal type", TIMEOUT])
+        if i==4:
+            self.sendline(terminal_type)
+            i = self.expect(["(?i)are you sure you want to continue connecting", original_prompt, "(?i)(?:password)|(?:passphrase for key)", "(?i)permission denied", "(?i)terminal type", TIMEOUT])
+
+        # Second phase
+        if i==0:
+            # This is weird. This should not happen twice in a row.
+            self.close()
+            raise ExceptionPxssh ('Weird error. Got "are you sure" prompt twice.')
+        elif i==1: # can occur if you have a public key pair set to authenticate. 
+            ### TODO: May NOT be OK if expect() got tricked and matched a false prompt.
+            pass
+        elif i==2: # password prompt again
+            # For incorrect passwords, some ssh servers will
+            # ask for the password again, others return 'denied' right away.
+            # If we get the password prompt again then this means
+            # we didn't get the password right the first time. 
+            self.close()
+            raise ExceptionPxssh ('password refused')
+        elif i==3: # permission denied -- password was bad.
+            self.close()
+            raise ExceptionPxssh ('permission denied')
+        elif i==4: # terminal type again? WTF?
+            self.close()
+            raise ExceptionPxssh ('Weird error. Got "terminal type" prompt twice.')
+        elif i==5: # Timeout
+            #This is tricky... I presume that we are at the command-line prompt.
+            #It may be that the shell prompt was so weird that we couldn't match
+            #it. Or it may be that we couldn't log in for some other reason. I
+            #can't be sure, but it's safe to guess that we did login because if
+            #I presume wrong and we are not logged in then this should be caught
+            #later when I try to set the shell prompt.
+            pass
+        elif i==6: # Connection closed by remote host
+            self.close()
+            raise ExceptionPxssh ('connection closed')
+        else: # Unexpected 
+            self.close()
+            raise ExceptionPxssh ('unexpected login response')
+        if not self.synch_original_prompt():
+            self.close()
+            raise ExceptionPxssh ('could not synchronize with original prompt')
+        # We appear to be in.
+        # set shell prompt to something unique.
+        if auto_prompt_reset:
+            if not self.set_unique_prompt():
+                self.close()
+                raise ExceptionPxssh ('could not set shell prompt\n'+self.before)
+        return True
+
+    def logout (self):
+
+        """This sends exit to the remote shell. If there are stopped jobs then
+        this automatically sends exit twice. """
+
+        self.sendline("exit")
+        index = self.expect([EOF, "(?i)there are stopped jobs"])
+        if index==1:
+            self.sendline("exit")
+            self.expect(EOF)
+        self.close()
+
+    def prompt (self, timeout=20):
+
+        """This matches the shell prompt. This is little more than a short-cut
+        to the expect() method. This returns True if the shell prompt was
+        matched. This returns False if there was a timeout. Note that if you
+        called login() with auto_prompt_reset set to False then you should have
+        manually set the PROMPT attribute to a regex pattern for matching the
+        prompt. """
+
+        i = self.expect([self.PROMPT, TIMEOUT], timeout=timeout)
+        if i==1:
+            return False
+        return True
+        
+    def set_unique_prompt (self):
+
+        """This sets the remote prompt to something more unique than # or $.
+        This makes it easier for the prompt() method to match the shell prompt
+        unambiguously. This method is called automatically by the login()
+        method, but you may want to call it manually if you somehow reset the
+        shell prompt. For example, if you 'su' to a different user then you
+        will need to manually reset the prompt. This sends shell commands to
+        the remote host to set the prompt, so this assumes the remote host is
+        ready to receive commands.
+
+        Alternatively, you may use your own prompt pattern. Just set the PROMPT
+        attribute to a regular expression that matches it. In this case you
+        should call login() with auto_prompt_reset=False; then set the PROMPT
+        attribute. After that the prompt() method will try to match your prompt
+        pattern."""
+
+        self.sendline ("unset PROMPT_COMMAND")
+        self.sendline (self.PROMPT_SET_SH) # sh-style
+        i = self.expect ([TIMEOUT, self.PROMPT], timeout=10)
+        if i == 0: # csh-style
+            self.sendline (self.PROMPT_SET_CSH)
+            i = self.expect ([TIMEOUT, self.PROMPT], timeout=10)
+            if i == 0:
+                return False
+        return True
+
+# vi:ts=4:sw=4:expandtab:ft=python:
diff --git a/third_party/pexpect/screen.py b/third_party/pexpect/screen.py
new file mode 100644
index 0000000..13699f9
--- /dev/null
+++ b/third_party/pexpect/screen.py
@@ -0,0 +1,380 @@
+"""This implements a virtual screen. This is used to support ANSI terminal
+emulation. The screen representation and state is implemented in this class.
+Most of the methods are inspired by ANSI screen control codes. The ANSI class
+extends this class to add parsing of ANSI escape codes.
+
+$Id: screen.py 486 2007-07-13 01:04:16Z noah $
+"""
+
+import copy
+
+NUL = 0    # Fill character; ignored on input.
+ENQ = 5    # Transmit answerback message.
+BEL = 7    # Ring the bell.
+BS  = 8    # Move cursor left.
+HT  = 9    # Move cursor to next tab stop.
+LF = 10    # Line feed.
+VT = 11    # Same as LF.
+FF = 12    # Same as LF.
+CR = 13    # Move cursor to left margin or newline.
+SO = 14    # Invoke G1 character set.
+SI = 15    # Invoke G0 character set.
+XON = 17   # Resume transmission.
+XOFF = 19  # Halt transmission.
+CAN = 24   # Cancel escape sequence.
+SUB = 26   # Same as CAN.
+ESC = 27   # Introduce a control sequence.
+DEL = 127  # Fill character; ignored on input.
+SPACE = chr(32) # Space or blank character.
+
+def constrain (n, min, max):
+
+    """This returns a number, n constrained to the min and max bounds. """
+
+    if n < min:
+        return min
+    if n > max:
+        return max
+    return n
+
+class screen:
+
+    """This object maintains the state of a virtual text screen as a
+    rectangluar array. This maintains a virtual cursor position and handles
+    scrolling as characters are added. This supports most of the methods needed
+    by an ANSI text screen. Row and column indexes are 1-based (not zero-based,
+    like arrays). """
+
+    def __init__ (self, r=24,c=80):
+
+        """This initializes a blank scree of the given dimentions."""
+
+        self.rows = r
+        self.cols = c
+        self.cur_r = 1
+        self.cur_c = 1
+        self.cur_saved_r = 1
+        self.cur_saved_c = 1
+        self.scroll_row_start = 1
+        self.scroll_row_end = self.rows
+        self.w = [ [SPACE] * self.cols for c in range(self.rows)]
+
+    def __str__ (self):
+
+        """This returns a printable representation of the screen. The end of
+        each screen line is terminated by a newline. """
+
+        return '\n'.join ([ ''.join(c) for c in self.w ])
+
+    def dump (self):
+
+        """This returns a copy of the screen as a string. This is similar to
+        __str__ except that lines are not terminated with line feeds. """
+
+        return ''.join ([ ''.join(c) for c in self.w ])
+
+    def pretty (self):
+
+        """This returns a copy of the screen as a string with an ASCII text box
+        around the screen border. This is similar to __str__ except that it
+        adds a box. """
+
+        top_bot = '+' + '-'*self.cols + '+\n'
+        return top_bot + '\n'.join(['|'+line+'|' for line in str(self).split('\n')]) + '\n' + top_bot
+
+    def fill (self, ch=SPACE):
+
+        self.fill_region (1,1,self.rows,self.cols, ch)
+
+    def fill_region (self, rs,cs, re,ce, ch=SPACE):
+
+        rs = constrain (rs, 1, self.rows)
+        re = constrain (re, 1, self.rows)
+        cs = constrain (cs, 1, self.cols)
+        ce = constrain (ce, 1, self.cols)
+        if rs > re:
+            rs, re = re, rs
+        if cs > ce:
+            cs, ce = ce, cs
+        for r in range (rs, re+1):
+            for c in range (cs, ce + 1):
+                self.put_abs (r,c,ch)
+
+    def cr (self):
+
+        """This moves the cursor to the beginning (col 1) of the current row.
+        """
+
+        self.cursor_home (self.cur_r, 1)
+
+    def lf (self):
+
+        """This moves the cursor down with scrolling.
+        """
+
+        old_r = self.cur_r
+        self.cursor_down()
+        if old_r == self.cur_r:
+            self.scroll_up ()
+            self.erase_line()
+
+    def crlf (self):
+
+        """This advances the cursor with CRLF properties.
+        The cursor will line wrap and the screen may scroll.
+        """
+
+        self.cr ()
+        self.lf ()
+
+    def newline (self):
+
+        """This is an alias for crlf().
+        """
+
+        self.crlf()
+
+    def put_abs (self, r, c, ch):
+
+        """Screen array starts at 1 index."""
+
+        r = constrain (r, 1, self.rows)
+        c = constrain (c, 1, self.cols)
+        ch = str(ch)[0]
+        self.w[r-1][c-1] = ch
+
+    def put (self, ch):
+
+        """This puts a characters at the current cursor position.
+        """
+
+        self.put_abs (self.cur_r, self.cur_c, ch)
+
+    def insert_abs (self, r, c, ch):
+
+        """This inserts a character at (r,c). Everything under
+        and to the right is shifted right one character.
+        The last character of the line is lost.
+        """
+
+        r = constrain (r, 1, self.rows)
+        c = constrain (c, 1, self.cols)
+        for ci in range (self.cols, c, -1): 
+            self.put_abs (r,ci, self.get_abs(r,ci-1))
+        self.put_abs (r,c,ch)
+
+    def insert (self, ch):
+
+        self.insert_abs (self.cur_r, self.cur_c, ch)
+
+    def get_abs (self, r, c):
+    
+        r = constrain (r, 1, self.rows)
+        c = constrain (c, 1, self.cols)
+        return self.w[r-1][c-1]
+
+    def get (self):
+
+        self.get_abs (self.cur_r, self.cur_c)
+
+    def get_region (self, rs,cs, re,ce):
+
+        """This returns a list of lines representing the region.
+        """
+
+        rs = constrain (rs, 1, self.rows)
+        re = constrain (re, 1, self.rows)
+        cs = constrain (cs, 1, self.cols)
+        ce = constrain (ce, 1, self.cols)
+        if rs > re:
+            rs, re = re, rs
+        if cs > ce:
+            cs, ce = ce, cs
+        sc = []
+        for r in range (rs, re+1):
+            line = ''
+            for c in range (cs, ce + 1):
+                ch = self.get_abs (r,c)
+                line = line + ch
+            sc.append (line)
+        return sc
+
+    def cursor_constrain (self):
+
+        """This keeps the cursor within the screen area.
+        """
+
+        self.cur_r = constrain (self.cur_r, 1, self.rows)
+        self.cur_c = constrain (self.cur_c, 1, self.cols)
+
+    def cursor_home (self, r=1, c=1): # <ESC>[{ROW};{COLUMN}H
+
+        self.cur_r = r
+        self.cur_c = c
+        self.cursor_constrain ()
+
+    def cursor_back (self,count=1): # <ESC>[{COUNT}D (not confused with down)
+
+        self.cur_c = self.cur_c - count
+        self.cursor_constrain ()
+
+    def cursor_down (self,count=1): # <ESC>[{COUNT}B (not confused with back)
+
+        self.cur_r = self.cur_r + count
+        self.cursor_constrain ()
+
+    def cursor_forward (self,count=1): # <ESC>[{COUNT}C
+
+        self.cur_c = self.cur_c + count
+        self.cursor_constrain ()
+
+    def cursor_up (self,count=1): # <ESC>[{COUNT}A
+
+        self.cur_r = self.cur_r - count
+        self.cursor_constrain ()
+
+    def cursor_up_reverse (self): # <ESC> M   (called RI -- Reverse Index)
+
+        old_r = self.cur_r
+        self.cursor_up()
+        if old_r == self.cur_r:
+            self.scroll_up()
+
+    def cursor_force_position (self, r, c): # <ESC>[{ROW};{COLUMN}f
+
+        """Identical to Cursor Home."""
+
+        self.cursor_home (r, c)
+
+    def cursor_save (self): # <ESC>[s
+
+        """Save current cursor position."""
+
+        self.cursor_save_attrs()
+
+    def cursor_unsave (self): # <ESC>[u
+
+        """Restores cursor position after a Save Cursor."""
+
+        self.cursor_restore_attrs()
+
+    def cursor_save_attrs (self): # <ESC>7
+
+        """Save current cursor position."""
+
+        self.cur_saved_r = self.cur_r
+        self.cur_saved_c = self.cur_c
+
+    def cursor_restore_attrs (self): # <ESC>8
+
+        """Restores cursor position after a Save Cursor."""
+
+        self.cursor_home (self.cur_saved_r, self.cur_saved_c)
+
+    def scroll_constrain (self):
+
+        """This keeps the scroll region within the screen region."""
+
+        if self.scroll_row_start <= 0:
+            self.scroll_row_start = 1
+        if self.scroll_row_end > self.rows:
+            self.scroll_row_end = self.rows
+
+    def scroll_screen (self): # <ESC>[r
+
+        """Enable scrolling for entire display."""
+
+        self.scroll_row_start = 1
+        self.scroll_row_end = self.rows
+
+    def scroll_screen_rows (self, rs, re): # <ESC>[{start};{end}r
+
+        """Enable scrolling from row {start} to row {end}."""
+
+        self.scroll_row_start = rs
+        self.scroll_row_end = re
+        self.scroll_constrain()
+
+    def scroll_down (self): # <ESC>D
+
+        """Scroll display down one line."""
+
+        # Screen is indexed from 1, but arrays are indexed from 0.
+        s = self.scroll_row_start - 1
+        e = self.scroll_row_end - 1
+        self.w[s+1:e+1] = copy.deepcopy(self.w[s:e])
+
+    def scroll_up (self): # <ESC>M
+
+        """Scroll display up one line."""
+
+        # Screen is indexed from 1, but arrays are indexed from 0.
+        s = self.scroll_row_start - 1
+        e = self.scroll_row_end - 1
+        self.w[s:e] = copy.deepcopy(self.w[s+1:e+1])
+
+    def erase_end_of_line (self): # <ESC>[0K -or- <ESC>[K
+
+        """Erases from the current cursor position to the end of the current
+        line."""
+
+        self.fill_region (self.cur_r, self.cur_c, self.cur_r, self.cols)
+
+    def erase_start_of_line (self): # <ESC>[1K
+
+        """Erases from the current cursor position to the start of the current
+        line."""
+
+        self.fill_region (self.cur_r, 1, self.cur_r, self.cur_c)
+
+    def erase_line (self): # <ESC>[2K
+
+        """Erases the entire current line."""
+
+        self.fill_region (self.cur_r, 1, self.cur_r, self.cols)
+
+    def erase_down (self): # <ESC>[0J -or- <ESC>[J
+
+        """Erases the screen from the current line down to the bottom of the
+        screen."""
+
+        self.erase_end_of_line ()
+        self.fill_region (self.cur_r + 1, 1, self.rows, self.cols)
+
+    def erase_up (self): # <ESC>[1J
+
+        """Erases the screen from the current line up to the top of the
+        screen."""
+
+        self.erase_start_of_line ()
+        self.fill_region (self.cur_r-1, 1, 1, self.cols)
+
+    def erase_screen (self): # <ESC>[2J
+
+        """Erases the screen with the background color."""
+
+        self.fill ()
+
+    def set_tab (self): # <ESC>H
+
+        """Sets a tab at the current position."""
+
+        pass
+
+    def clear_tab (self): # <ESC>[g
+
+        """Clears tab at the current position."""
+
+        pass
+
+    def clear_all_tabs (self): # <ESC>[3g
+
+        """Clears all tabs."""
+
+        pass
+
+#        Insert line             Esc [ Pn L
+#        Delete line             Esc [ Pn M
+#        Delete character        Esc [ Pn P
+#        Scrolling region        Esc [ Pn(top);Pn(bot) r
+