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#!/usr/bin/env python
# SPDX-License-Identifier: Unlicense
#
# Based on the template file provided by the 'YCM-Generator' project authored by
# Reuben D'Netto.
# Jiahui Xie has re-reformatted and expanded the original script in accordance
# to the requirements of the PEP 8 style guide and 'systemd' project,
# respectively.
#
# The original license is preserved as it is.
#
#
# 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/>
"""
YouCompleteMe configuration file tailored to support the 'meson' build system
used by the 'systemd' project.
"""
import glob
import os
import ycm_core
SOURCE_EXTENSIONS = (".C", ".cpp", ".cxx", ".cc", ".c", ".m", ".mm")
HEADER_EXTENSIONS = (".H", ".h", ".hxx", ".hpp", ".hh")
def DirectoryOfThisScript():
"""
Return the absolute path of the parent directory containing this
script.
"""
return os.path.dirname(os.path.abspath(__file__))
def GuessBuildDirectory():
"""
Guess the build directory using the following heuristics:
1. Returns the current directory of this script plus 'build'
subdirectory in absolute path if this subdirectory exists.
2. Otherwise, probes whether there exists any directory
containing '.ninja_log' file two levels above the current directory;
returns this single directory only if there is one candidate.
"""
result = os.path.join(DirectoryOfThisScript(), "build")
if os.path.exists(result):
return result
result = glob.glob(os.path.join(DirectoryOfThisScript(),
"..", "..", "*", ".ninja_log"))
if not result:
return ""
if 1 != len(result):
return ""
return os.path.split(result[0])[0]
def TraverseByDepth(root, include_extensions):
"""
Return a set of child directories of the 'root' containing file
extensions specified in 'include_extensions'.
NOTE:
1. The 'root' directory itself is excluded from the result set.
2. No subdirectories would be excluded if 'include_extensions' is left
to 'None'.
3. Each entry in 'include_extensions' must begin with string '.'.
"""
is_root = True
result = set()
# Perform a depth first top down traverse of the given directory tree.
for root_dir, subdirs, file_list in os.walk(root):
if not is_root:
# print("Relative Root: ", root_dir)
# print(subdirs)
if include_extensions:
get_ext = os.path.splitext
subdir_extensions = {
get_ext(f)[-1] for f in file_list if get_ext(f)[-1]
}
if subdir_extensions & include_extensions:
result.add(root_dir)
else:
result.add(root_dir)
else:
is_root = False
return result
_project_src_dir = os.path.join(DirectoryOfThisScript(), "src")
_include_dirs_set = TraverseByDepth(_project_src_dir, frozenset({".h"}))
flags = [
"-x",
"c"
# The following flags are partially redundant due to the existence of
# 'compile_commands.json'.
# '-Wall',
# '-Wextra',
# '-Wfloat-equal',
# '-Wpointer-arith',
# '-Wshadow',
# '-std=gnu99',
]
for include_dir in _include_dirs_set:
flags.append("-I" + include_dir)
# 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 = GuessBuildDirectory()
if os.path.exists(compilation_database_folder):
database = ycm_core.CompilationDatabase(compilation_database_folder)
else:
database = None
def MakeRelativePathsInFlagsAbsolute(flags, working_directory):
"""
Iterate through 'flags' and replace the relative paths prefixed by
'-isystem', '-I', '-iquote', '--sysroot=' with absolute paths
start with '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):
"""
Check whether 'filename' is considered as a header file.
"""
extension = os.path.splitext(filename)[1]
return extension in HEADER_EXTENSIONS
def GetCompilationInfoForFile(filename):
"""
Helper function to look up compilation info of 'filename' in the 'database'.
"""
# 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 not database:
return None
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):
"""
Callback function to be invoked by YouCompleteMe in order to get the
information necessary to compile 'filename'.
It returns a dictionary with a single element 'flags'. This element is a
list of compiler flags to pass to libclang for the file 'filename'.
"""
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
}