# 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/>

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

DIR_OF_THIS_SCRIPT = os.path.abspath( os.path.dirname( __file__ ) )
DIR_OF_THIRD_PARTY = os.path.join( DIR_OF_THIS_SCRIPT, 'third_party' )
DIR_OF_WATCHDOG_DEPS = os.path.join( DIR_OF_THIRD_PARTY, 'watchdog_deps' )
SOURCE_EXTENSIONS = [ '.cpp', '.cxx', '.cc', '.c', '.m', '.mm' ]

database = None

# 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',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-DNDEBUG',
# You 100% do NOT need -DUSE_CLANG_COMPLETER and/or -DYCM_EXPORT in your flags;
# only the YCM source code needs it.
'-DUSE_CLANG_COMPLETER',
'-DYCM_EXPORT=',
'-DYCM_ABSEIL_SUPPORTED',
# THIS IS IMPORTANT! Without the '-x' flag, Clang won't know which language to
# use when compiling headers. So it will guess. Badly. So C++ headers will be
# compiled as C headers. You don't want that so ALWAYS specify the '-x' flag.
# For a C project, you would set this to 'c' instead of 'c++'.
'-x',
'c++',
'-isystem',
'cpp/absl',
'-isystem',
'cpp/pybind11',
'-isystem',
'cpp/whereami',
'-isystem',
'cpp/BoostParts',
'-isystem',
get_python_inc(),
'-isystem',
'cpp/llvm/include',
'-isystem',
'cpp/llvm/tools/clang/include',
'-I',
'cpp/ycm',
'-I',
'cpp/ycm/ClangCompleter',
'-isystem',
'cpp/ycm/tests/gmock/googlemock/include',
'-isystem',
'cpp/ycm/tests/gmock/googletest/include',
'-isystem',
'cpp/ycm/benchmarks/benchmark/include',
'-std=c++17',
]

# 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 = ''


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


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 PathToPythonUsedDuringBuild():
    try:
        filepath = os.path.join( DIR_OF_THIS_SCRIPT, 'PYTHON_USED_DURING_BUILDING' )
        with open( filepath ) as f:
            return f.read().strip()
    except OSError:
        return None


def Settings( filename ):
  # Do NOT import ycm_core at module scope.
  import ycm_core

  global flags
  if os.access(os.environ['HOME'] + '/.vim/' + 'ycm_cpp_compiler_config.py', os.R_OK):
    import ycm_cpp_compiler_config
    flags = ycm_cpp_compiler_config.compiler_options_get()
  else:
    print('Does not exist file: ' + os.environ['HOME'] + '/.vim/' + 'ycm_cpp_compiler_config.py')

  global database
  if database is None and os.path.exists( compilation_database_folder ):
    database = ycm_core.CompilationDatabase( compilation_database_folder )

  filename = FindCorrespondingSourceFile( 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_ )

  # NOTE: This is just for YouCompleteMe; it's highly likely that your project
  # does NOT need to remove the stdlib flag. DO NOT USE THIS IN YOUR
  # ycm_extra_conf IF YOU'RE NOT 100% SURE YOU NEED IT.
  try:
    final_flags.remove( '-stdlib=libc++' )
  except ValueError:
    pass

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