117 lines
3.3 KiB
Python
Executable File
117 lines
3.3 KiB
Python
Executable File
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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import json
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import sys
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import re
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import os
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'''A simple compilation database generator, or cdg in short.
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It works by parsing the output of the GNU make command.'''
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file_name_regex = re.compile(r"[\w./+\-]+\.(s|cc?|cpp|cxx)\b",
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re.IGNORECASE)
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enter_dir_regex = re.compile(r"^\s*make(?:\[\d+\])?: Entering directory [`\'\"](?P<dir>.*)[`\'\"]\s*$",
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re.MULTILINE)
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leave_dir_regex = re.compile(r"^\s*make(?:\[\d+\])?: Leaving directory .*$",
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re.MULTILINE)
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compilers_regex = re.compile(r'\b(g?cc|[gc]\+\+|clang\+?\+?|icecc|s?ccache)\s')
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def parse(make_output):
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'''Parse the make output into a list of objects.
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Per https://clang.llvm.org/docs/JSONCompilationDatabase.html
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'''
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result = []
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pwd = ""
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path_stack = []
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for line in make_output.replace('\r', '').split('\n'):
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line = line.strip()
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enter_dir_match = enter_dir_regex.match(line)
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if enter_dir_match:
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pwd = enter_dir_match.group('dir')
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path_stack.append(pwd)
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# logger.debug("stack after append: {}".format(path_stack))
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continue
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elif leave_dir_regex.match(line):
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# logger.debug("stack before pop: {}".format(path_stack))
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path_stack.pop()
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if path_stack:
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pwd = path_stack[-1]
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continue
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match = compilers_regex.search(line)
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if not match:
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continue
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# look backward and discard anything before delimiters
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i = match.start()
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while i > 0:
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j = i - 1
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if line[j] in (' ', '\t', '\n', ';', '&'):
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break
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i -= 1
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line = line[i:]
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file_match = file_name_regex.search(line)
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# logger.debug(line, file_match)
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if not file_match:
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continue
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# To workaround that there is no "entering directory..."
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if not pwd:
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pwd = os.getcwd()
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path_stack.append(pwd)
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# Special handling for projects like Redis,
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# which has output like "printf xxx; cc xxx"
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command = line
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ri = command.rfind(';')
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if -1 != ri:
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command = command[:ri]
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ri = command.rfind('&&')
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if -1 != ri:
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command = command[:ri]
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result.append({
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"directory": pwd.strip(),
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"file": file_match.group(0).strip(),
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"command": command.strip(),
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})
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return result
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def usage():
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print('''Usage: {} [compilation-db-file]
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[compilation-db-file] is optional, which is `compile_commands.json` by default.
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Specify it if you want to write to another file, and specify `-` for stdout.
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This CLI program takes GNU make output from stdin from a pipe,
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parse it, and write the json string to a file.
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'''.format(sys.argv[0]))
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sys.exit(1)
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def main():
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make_output = sys.stdin.read().strip()
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if not make_output:
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usage()
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db = json.dumps(parse(make_output),
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indent=2) + '\n'
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file_name = 'compile_commands.json' if len(sys.argv) == 1 else sys.argv[1]
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if '-' != file_name:
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with open(file_name, "w") as f:
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f.write(db)
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else:
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sys.stdout.write(db)
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if __name__ == '__main__':
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main()
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