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// Copyright (c) 2013 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.
#include "tools/gn/standard_out.h"
#include <vector>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/strings/string_split.h"
#include "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#else
#include <stdio.h>
#include <unistd.h>
#endif
namespace {
bool initialized = false;
static const char kSwitchColor[] = "color";
static const char kSwitchNoColor[] = "nocolor";
#if defined(OS_WIN)
HANDLE hstdout;
WORD default_attributes;
#endif
bool is_console = false;
void EnsureInitialized() {
if (initialized)
return;
initialized = true;
const base::CommandLine* cmdline = base::CommandLine::ForCurrentProcess();
if (cmdline->HasSwitch(kSwitchNoColor)) {
// Force color off.
is_console = false;
return;
}
#if defined(OS_WIN)
// On Windows, we can't force the color on. If the output handle isn't a
// console, there's nothing we can do about it.
hstdout = ::GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_SCREEN_BUFFER_INFO info;
is_console = !!::GetConsoleScreenBufferInfo(hstdout, &info);
default_attributes = info.wAttributes;
#else
if (cmdline->HasSwitch(kSwitchColor))
is_console = true;
else
is_console = isatty(fileno(stdout));
#endif
}
void WriteToStdOut(const std::string& output) {
size_t written_bytes = fwrite(output.data(), 1, output.size(), stdout);
DCHECK_EQ(output.size(), written_bytes);
}
} // namespace
#if defined(OS_WIN)
void OutputString(const std::string& output, TextDecoration dec) {
EnsureInitialized();
if (is_console) {
switch (dec) {
case DECORATION_NONE:
break;
case DECORATION_DIM:
::SetConsoleTextAttribute(hstdout, FOREGROUND_INTENSITY);
break;
case DECORATION_RED:
::SetConsoleTextAttribute(hstdout,
FOREGROUND_RED | FOREGROUND_INTENSITY);
break;
case DECORATION_GREEN:
// Keep green non-bold.
::SetConsoleTextAttribute(hstdout, FOREGROUND_GREEN);
break;
case DECORATION_BLUE:
::SetConsoleTextAttribute(hstdout,
FOREGROUND_BLUE | FOREGROUND_INTENSITY);
break;
case DECORATION_YELLOW:
::SetConsoleTextAttribute(hstdout,
FOREGROUND_RED | FOREGROUND_GREEN);
break;
}
}
DWORD written = 0;
::WriteFile(hstdout, output.c_str(), static_cast<DWORD>(output.size()),
&written, NULL);
if (is_console)
::SetConsoleTextAttribute(hstdout, default_attributes);
}
#else
void OutputString(const std::string& output, TextDecoration dec) {
EnsureInitialized();
if (is_console) {
switch (dec) {
case DECORATION_NONE:
break;
case DECORATION_DIM:
WriteToStdOut("\e[2m");
break;
case DECORATION_RED:
WriteToStdOut("\e[31m\e[1m");
break;
case DECORATION_GREEN:
WriteToStdOut("\e[32m");
break;
case DECORATION_BLUE:
WriteToStdOut("\e[34m\e[1m");
break;
case DECORATION_YELLOW:
WriteToStdOut("\e[33m\e[1m");
break;
}
}
WriteToStdOut(output.data());
if (is_console && dec != DECORATION_NONE)
WriteToStdOut("\e[0m");
}
#endif
void PrintShortHelp(const std::string& line) {
size_t colon_offset = line.find(':');
size_t first_normal = 0;
if (colon_offset != std::string::npos) {
OutputString(" " + line.substr(0, colon_offset), DECORATION_YELLOW);
first_normal = colon_offset;
}
// See if the colon is followed by a " [" and if so, dim the contents of [ ].
if (first_normal > 0 &&
line.size() > first_normal + 2 &&
line[first_normal + 1] == ' ' && line[first_normal + 2] == '[') {
size_t begin_bracket = first_normal + 2;
OutputString(": ");
first_normal = line.find(']', begin_bracket);
if (first_normal == std::string::npos)
first_normal = line.size();
else
first_normal++;
OutputString(line.substr(begin_bracket, first_normal - begin_bracket),
DECORATION_DIM);
}
OutputString(line.substr(first_normal) + "\n");
}
void PrintLongHelp(const std::string& text) {
std::vector<std::string> lines;
base::SplitStringDontTrim(text, '\n', &lines);
for (const auto& line : lines) {
// Check for a heading line.
if (!line.empty() && line[0] != ' ') {
// Highlight up to the colon (if any).
size_t chars_to_highlight = line.find(':');
if (chars_to_highlight == std::string::npos)
chars_to_highlight = line.size();
OutputString(line.substr(0, chars_to_highlight), DECORATION_YELLOW);
OutputString(line.substr(chars_to_highlight) + "\n");
continue;
}
// Check for a comment.
TextDecoration dec = DECORATION_NONE;
for (size_t char_i = 0; char_i < line.size(); char_i++) {
if (line[char_i] == '#') {
// Got a comment, draw dimmed.
dec = DECORATION_DIM;
break;
} else if (line[char_i] != ' ') {
break;
}
}
OutputString(line + "\n", dec);
}
}
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