1 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
5 # Autocompletion config for YouCompleteMe in Chromium.
9 # 1. Install YCM [https://github.com/Valloric/YouCompleteMe]
10 # (Googlers should check out [go/ycm])
12 # 2. Point to this config file in your .vimrc:
13 # let g:ycm_global_ycm_extra_conf =
14 # '<chrome_depot>/src/tools/vim/chromium.ycm_extra_conf.py'
21 # * You must use ninja & clang to build Chromium.
23 # * You must have run gyp_chromium and built Chromium recently.
28 # * The purpose of this script is to construct an accurate enough command line
29 # for YCM to pass to clang so it can build and extract the symbols.
31 # * Right now, we only pull the -I and -D flags. That seems to be sufficient
32 # for everything I've used it for.
34 # * That whole ninja & clang thing? We could support other configs if someone
35 # were willing to write the correct commands and a parser.
37 # * This has only been tested on gPrecise.
45 # Flags from YCM's default config.
47 '-DUSE_CLANG_COMPLETER',
54 def PathExists(*args):
55 return os.path.exists(os.path.join(*args))
58 def FindChromeSrcFromFilename(filename):
59 """Searches for the root of the Chromium checkout.
61 Simply checks parent directories until it finds .gclient and src/.
64 filename: (String) Path to source file being edited.
67 (String) Path of 'src/', or None if unable to find.
69 curdir = os.path.normpath(os.path.dirname(filename))
70 while not (PathExists(curdir, 'src') and PathExists(curdir, 'src', 'DEPS')
71 and (PathExists(curdir, '.gclient')
72 or PathExists(curdir, 'src', '.git'))):
73 nextdir = os.path.normpath(os.path.join(curdir, '..'))
77 return os.path.join(curdir, 'src')
80 # Largely copied from ninja-build.vim (guess_configuration)
81 def GetNinjaOutputDirectory(chrome_root):
82 """Returns <chrome_root>/<output_dir>/(Release|Debug).
84 The configuration chosen is the one most recently generated/built. Detects
85 a custom output_dir specified by GYP_GENERATOR_FLAGS."""
88 generator_flags = os.getenv('GYP_GENERATOR_FLAGS', '').split(' ')
89 for flag in generator_flags:
90 name_value = flag.split('=', 1)
91 if len(name_value) == 2 and name_value[0] == 'output_dir':
92 output_dir = name_value[1]
94 root = os.path.join(chrome_root, output_dir)
95 debug_path = os.path.join(root, 'Debug')
96 release_path = os.path.join(root, 'Release')
98 def is_release_15s_newer(test_path):
100 debug_mtime = os.path.getmtime(os.path.join(debug_path, test_path))
104 rel_mtime = os.path.getmtime(os.path.join(release_path, test_path))
107 return rel_mtime - debug_mtime >= 15
109 if is_release_15s_newer('build.ninja') or is_release_15s_newer('protoc'):
114 def GetClangCommandFromNinjaForFilename(chrome_root, filename):
115 """Returns the command line to build |filename|.
117 Asks ninja how it would build the source file. If the specified file is a
118 header, tries to find its companion source file first.
121 chrome_root: (String) Path to src/.
122 filename: (String) Path to source file being edited.
125 (List of Strings) Command line arguments for clang.
130 # Generally, everyone benefits from including Chromium's src/, because all of
131 # Chromium's includes are relative to that.
132 chrome_flags = ['-I' + os.path.join(chrome_root)]
134 # Version of Clang used to compile Chromium can be newer then version of
135 # libclang that YCM uses for completion. So it's possible that YCM's libclang
136 # doesn't know about some used warning options, which causes compilation
137 # warnings (and errors, because of '-Werror');
138 chrome_flags.append('-Wno-unknown-warning-option')
140 # Default file to get a reasonable approximation of the flags for a Blink
142 blink_root = os.path.join(chrome_root, 'third_party', 'WebKit')
143 default_blink_file = os.path.join(blink_root, 'Source', 'core', 'Init.cpp')
145 # Header files can't be built. Instead, try to match a header file to its
146 # corresponding source file.
147 if filename.endswith('.h'):
148 # Add config.h to Blink headers, which won't have it by default.
149 if filename.startswith(blink_root):
150 chrome_flags.append('-include')
151 chrome_flags.append(os.path.join(blink_root, 'Source', 'config.h'))
153 alternates = ['.cc', '.cpp']
154 for alt_extension in alternates:
155 alt_name = filename[:-2] + alt_extension
156 if os.path.exists(alt_name):
160 if filename.startswith(blink_root):
161 # If this is a Blink file, we can at least try to get a reasonable
163 filename = default_blink_file
165 # If this is a standalone .h file with no source, the best we can do is
166 # try to use the default flags.
169 out_dir = os.path.realpath(GetNinjaOutputDirectory(chrome_root))
171 # Ninja needs the path to the source file relative to the output build
173 rel_filename = os.path.relpath(os.path.realpath(filename), out_dir)
175 # Ask ninja how it would build our source file.
176 p = subprocess.Popen(['ninja', '-v', '-C', out_dir, '-t',
177 'commands', rel_filename + '^'],
178 stdout=subprocess.PIPE)
179 stdout, stderr = p.communicate()
183 # Ninja might execute several commands to build something. We want the last
186 for line in reversed(stdout.split('\n')):
193 # Parse flags that are important for YCM's purposes.
194 for flag in clang_line.split(' '):
195 if flag.startswith('-I'):
196 # Relative paths need to be resolved, because they're relative to the
197 # output dir, not the source.
199 chrome_flags.append(flag)
201 abs_path = os.path.normpath(os.path.join(out_dir, flag[2:]))
202 chrome_flags.append('-I' + abs_path)
203 elif flag.startswith('-std'):
204 chrome_flags.append(flag)
205 elif flag.startswith('-') and flag[1] in 'DWFfmO':
206 if flag == '-Wno-deprecated-register' or flag == '-Wno-header-guard':
207 # These flags causes libclang (3.3) to crash. Remove it until things
210 chrome_flags.append(flag)
215 def FlagsForFile(filename):
216 """This is the main entry point for YCM. Its interface is fixed.
219 filename: (String) Path to source file being edited.
223 'flags': (List of Strings) Command line flags.
224 'do_cache': (Boolean) True if the result should be cached.
226 chrome_root = FindChromeSrcFromFilename(filename)
227 chrome_flags = GetClangCommandFromNinjaForFilename(chrome_root,
229 final_flags = flags + chrome_flags
232 'flags': final_flags,