.ycm_extra_conf.py

#
#   Copyright (C) 2014-2024 CASM Organization <https://casm-lang.org>
#   All rights reserved.
#
#   Developed by: Philipp Paulweber et al.
#   <https://github.com/casm-lang/libcasm-tc/graphs/contributors>
#
#   This file is part of libcasm-tc.
#
#   libcasm-tc is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   libcasm-tc is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with libcasm-tc. If not, see <http://www.gnu.org/licenses/>.
#
#   Additional permission under GNU GPL version 3 section 7
#
#   libcasm-tc is distributed under the terms of the GNU General Public License
#   with the following clarification and special exception: Linking libcasm-tc
#   statically or dynamically with other modules is making a combined work
#   based on libcasm-tc. Thus, the terms and conditions of the GNU General
#   Public License cover the whole combination. As a special exception,
#   the copyright holders of libcasm-tc give you permission to link libcasm-tc
#   with independent modules to produce an executable, regardless of the
#   license terms of these independent modules, and to copy and distribute
#   the resulting executable under terms of your choice, provided that you
#   also meet, for each linked independent module, the terms and conditions
#   of the license of that module. An independent module is a module which
#   is not derived from or based on libcasm-tc. If you modify libcasm-tc, you
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#   not obliged to do so. If you do not wish to do so, delete this exception
#   statement from your version.
#

# based on: https://bastian.rieck.ru/blog/posts/2015/ycm_cmake

import os
import ycm_core
from clang_helpers import PrepareClangFlags

def DirectoryOfThisScript():
    return os.path.dirname(os.path.abspath(__file__))

compilation_database_folder = DirectoryOfThisScript() + "/obj"

flags = [
    '-Wall',
    '-Wextra',
    '-std=c++14',
    '-stdlib=libc++',
    '-x',
    'c++',
    '-I',
    '.',
    '-isystem', '/usr/local/include',
    '-isystem', '/usr/include',
    '-I.',
]

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

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

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

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 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 = DirectoryOfThisScript()
    final_flags = MakeRelativePathsInFlagsAbsolute( flags, relative_to )

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

def Settings(*args, **kwargs):
    return FlagsForFile(*args, **kwargs)