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-#!/bin/env python
-# Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Wrapper around BeyondCompare or kdiff3 so it can be used as svn's diff3-cmd
-tool.
-
-The basic idea here is based heavily off of diffwrap.py at:
-http://svnbook.red-bean.com/en/1.5/svn.advanced.externaldifftools.html#svn.advanced.externaldifftools.diff3.ex-1
-"""
-
-import optparse
-import os
-import subprocess
-import sys
-import traceback
-
-CYGDRIVE = '/cygdrive/'
-CYGLEN = len(CYGDRIVE)
-
-# TODO(ojan): Eventually make this a cross-platform script that makes it easy
-# to use different diffing tools (an enum of tools maybe?).
-# The difficulty is that each tool has its own supported arguments.
-def EnsureWindowsPath(path):
- """ Returns a Windows-style path given a Windows path or a cygwin path.
- """
- if path.startswith(CYGDRIVE):
- path = path[CYGLEN:CYGLEN + 1] + ':' + path[CYGLEN + 1:]
- path = path.replace('/', '\\')
- return path
-
-def GetPathToBinary(exe):
- """ Try to find a copy of the binary that exists. Search for the full path
- and then the basename.
- """
- if not os.path.exists(exe):
- exe = os.path.basename(exe)
- return exe
-
-def main(args):
- """ Provides a wrapper around 3rd-party diffing tools so they can be used as
- the diff3-cmd in svn merge.
-
- args: The arguments passed by svn merge to its diff3 tool.
- """
- # Grab the arguments from the end of the list since svn will add any other
- # arguments provided before these.
-
- # The titles of the files being diffed.
- title_mine = EnsureWindowsPath(args[-8])
- title_older = EnsureWindowsPath(args[-6])
- title_yours = EnsureWindowsPath(args[-4])
-
- # The paths to the files being diffed. These will be temp files.
- mine = EnsureWindowsPath(args[-3])
- older = EnsureWindowsPath(args[-2])
- yours = EnsureWindowsPath(args[-1])
-
- # The command for which diff3 tool to use.
- diff_tool = args[1]
-
- if diff_tool == "--use-beyondcompare":
- exe = GetPathToBinary("c:/Progra~1/Beyond~1/BComp.exe")
- if not os.path.exists(exe):
- exe = GetPathToBinary("c:/Progra~2/Beyond~1/BComp.exe")
- cmd = [exe,
- mine,
- yours,
- older,
- mine,
- '/reviewconflicts',
- '/automerge',
- '/leftreadonly',
- '/rightreadonly',
- '/ignoreunimportant',
- '/lefttitle', title_mine,
- '/righttitle', title_yours,
- '/centertitle', title_older,
- '/outputtitle', 'merged']
- elif diff_tool == "--use-kdiff3":
- exe = GetPathToBinary("c:/Progra~1/KDiff3/kdiff3.exe")
- if not os.path.exists(exe):
- exe = GetPathToBinary("c:/Progra~2/KDiff3/kdiff3.exe")
- cmd = [exe,
- older,
- mine,
- yours,
- "--merge",
- "--auto",
- "--output", mine]
- else:
- # TODO(ojan): Maybe fall back to diff3?
- raise Exception, "Must specify a diff tool to use."
-
- try:
- # Work around http://bugs.python.org/issue3905
- # by passing stderr and stdin as well since beyondcompare is a GUI app
- return_code = subprocess.call(cmd,
- stdout=subprocess.PIPE,
- stderr=subprocess.PIPE,
- stdin=subprocess.PIPE,
- shell=True)
- except Exception,e:
- print "Error running " + (" ".join(cmd))
- traceback.print_exc(file=sys.stdout)
-
- # After performing the merge, this script needs to print the contents
- # of the merged file to stdout.
- # Return an errorcode of 0 on successful merge, 1 if unresolved conflicts
- # remain in the result. Any other errorcode will be treated as fatal.
- merged_file_contents = open(mine).read()
-
- # For reasons I don't understand, an extra line break gets added at the end
- # of the file. Strip it.
- merged_file_contents = merged_file_contents[:-1]
- print merged_file_contents
- return return_code
-
-if '__main__' == __name__:
- try:
- return_code = main(sys.argv)
- except Exception,e:
- traceback.print_exc(file=sys.stdout)
- # diff3 uses '1' to mean "conflict" and 2 to mean "I barfed".
- sys.exit(2) # return "I barfed"
- sys.exit(return_code)