File: .ycm_extra_conf.py

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#!/usr/bin/python
# This file is NOT licensed under the GPLv3, which is the license for the rest
# of YouCompleteMe.
#
# Here's the license text for this file:
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# 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 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.
#
# For more information, please refer to <http://unlicense.org/>

import os
from subprocess import check_output
import ycm_core

flags = [
'-Wall',
'-Wextra',
'-Wno-unused-parameter',
'-fexceptions',
'-x', 'c++',
'-std=c++11',
'-I', '.',
'-isystem', '/usr/include',
'-isystem', '/usr/local/include',
'-isystem', '/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4',
'-isystem', '/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4/x86_64-pc-linux-gnu',
'-isystem', '/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4/backward',
'-isystem', '/usr/lib/clang/3.7.1/include',
'-isystem', '/usr/include/c++/v1',
'-isystem', '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1',
'-isystem', '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/7.0.0/include',
'-isystem', '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include',
'-isystem', '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include',
'-F', '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks'
]

# Set this to the absolute path to the folder (NOT the file!) containing the
# compile_commands.json file to use that instead of 'flags'. See here for
# more details: http://clang.llvm.org/docs/JSONCompilationDatabase.html
#
# Most projects will NOT need to set this to anything; you can just change the
# 'flags' list of compilation flags. Notice that YCM itself uses that approach.
compilation_database_folder = ''

if os.path.exists(compilation_database_folder):
    database = ycm_core.CompilationDatabase(compilation_database_folder)
else:
    database = None

SOURCE_EXTENSIONS = [ '.cpp', '.cxx', '.cc', '.c', '.m', '.mm' ]


def MakeRelativePathsInFlagsAbsolute(flags, working_directory):
    if not working_directory:
        return list( flags )
    new_flags = []
    make_next_absolute = False
    path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
    for flag in flags:
        new_flag = flag

        if make_next_absolute:
            make_next_absolute = False
            if not flag.startswith( '/' ):
                new_flag = os.path.join( working_directory, flag )

        for path_flag in path_flags:
            if flag == path_flag:
                make_next_absolute = True
                break

            if flag.startswith( path_flag ):
                path = flag[ len( path_flag ): ]
                new_flag = path_flag + os.path.join( working_directory, path )
                break

        if new_flag:
            new_flags.append( new_flag )
    return new_flags

def IsHeaderFile(filename):
    extension = os.path.splitext(filename)[1]
    return extension in [ '.h', '.hxx', '.hpp', '.hh' ]

def GetCompilationInfoForFile(filename):
    # The compilation_commands.json file generated by CMake does not have entries
    # for header files. So we do our best by asking the db for flags for a
    # corresponding source file, if any. If one exists, the flags for that file
    # should be good enough.
    if IsHeaderFile( filename ):
        basename = os.path.splitext( filename )[ 0 ]
        for extension in SOURCE_EXTENSIONS:
            replacement_file = basename + extension
            if os.path.exists( replacement_file ):
                compilation_info = database.GetCompilationInfoForFile(
                    replacement_file )
                if compilation_info.compiler_flags_:
                    return compilation_info
        return None
    return database.GetCompilationInfoForFile(filename)


def FlagsForFile( filename, **kwargs ):
    if database:
        # Bear in mind that compilation_info.compiler_flags_ does NOT return a
        # python list, but a "list-like" StringVec object
        compilation_info = GetCompilationInfoForFile(filename)
        if not compilation_info:
            return None

        final_flags = MakeRelativePathsInFlagsAbsolute(
            compilation_info.compiler_flags_,
            compilation_info.compiler_working_dir_ )

    else:
        relative_to = os.path.dirname(os.path.abspath( __file__ ))
        final_flags = MakeRelativePathsInFlagsAbsolute( flags, relative_to )

    return {
        'flags': final_flags,
        'do_cache': True
    }