.ycm_extra_conf.py

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from distutils.sysconfig import get_python_inc
import platform
import os
import subprocess
import ycm_core

DIR_OF_THIS_SCRIPT = os.path.abspath( os.path.dirname( __file__ ) )
DIR_OF_THIRD_PARTY = os.path.join( DIR_OF_THIS_SCRIPT, 'lib' )
SOURCE_EXTENSIONS = [ '.c' ]

# These are the compilation flags that will be used in case there's no
# compilation database set (by default, one is not set).
# CHANGE THIS LIST OF FLAGS. YES, THIS IS THE DROID YOU HAVE BEEN LOOKING FOR.
flags = [
        '-Wall',
        '-Wextra',
        '-Werror',
        '-pedantic',
        '-std=c99',
        '-xc',
        '-Iinclude',
        '-I/usr/lib/',
        '-I/usr/include/'
]

# 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
#
# You can get CMake to generate this file for you by adding:
#   set( CMAKE_EXPORT_COMPILE_COMMANDS 1 )
# to your CMakeLists.txt file.
#
# 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


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


def FindCorrespondingSourceFile( filename ):
  if IsHeaderFile( filename ):
    basename = os.path.splitext( filename )[ 0 ]
    for extension in SOURCE_EXTENSIONS:
      replacement_file = basename + extension
      if os.path.exists( replacement_file ):
        return replacement_file
  return filename


def Settings( **kwargs ):
  if kwargs[ 'language' ] == 'cfamily':
    # If the file is a header, try to find the corresponding source file and
    # retrieve its flags from the compilation database if using one. This is
    # necessary since compilation databases don't have entries for header files.
    # In addition, use this source file as the translation unit. This makes it
    # possible to jump from a declaration in the header file to its definition
    # in the corresponding source file.
    filename = FindCorrespondingSourceFile( kwargs[ 'filename' ] )

    if not database:
      return {
        'flags': flags,
        'include_paths_relative_to_dir': DIR_OF_THIS_SCRIPT,
        'override_filename': filename
      }

    compilation_info = database.GetCompilationInfoForFile( filename )
    if not compilation_info.compiler_flags_:
      return {}

    # Bear in mind that compilation_info.compiler_flags_ does NOT return a
    # python list, but a "list-like" StringVec object.
    final_flags = list( compilation_info.compiler_flags_ )

    return {
      'flags': final_flags,
      'include_paths_relative_to_dir': compilation_info.compiler_working_dir_,
      'override_filename': filename
    }
  return {}


def GetStandardLibraryIndexInSysPath( sys_path ):
  for path in sys_path:
    if os.path.isfile( os.path.join( path, 'os.py' ) ):
      return sys_path.index( path )
  raise RuntimeError( 'Could not find standard library path in Python path.' )


def PythonSysPath( **kwargs ):
  sys_path = kwargs[ 'sys_path' ]
  for folder in os.listdir( DIR_OF_THIRD_PARTY ):
    if folder == 'python-future':
      folder = os.path.join( folder, 'src' )
      sys_path.insert( GetStandardLibraryIndexInSysPath( sys_path ) + 1,
                       os.path.realpath( os.path.join( DIR_OF_THIRD_PARTY,
                                                       folder ) ) )
      continue

    if folder == 'cregex':
      interpreter_path = kwargs[ 'interpreter_path' ]
      major_version = subprocess.check_output( [
        interpreter_path, '-c', 'import sys; print( sys.version_info[ 0 ] )' ]
      ).rstrip().decode( 'utf8' )
      folder = os.path.join( folder, 'regex_{}'.format( major_version ) )

    sys_path.insert( 0, os.path.realpath( os.path.join( DIR_OF_THIRD_PARTY,
                                                        folder ) ) )
  return sys_path