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#!/usr/bin/env python3
# A tool to parse the output of `clang-format --help` and update the
# documentation in ../ClangFormat.rst automatically.
import os
import re
import subprocess
import sys
CLANG_DIR = os.path.join(os.path.dirname(__file__), '../..')
DOC_FILE = os.path.join(CLANG_DIR, 'docs/ClangFormat.rst')
def substitute(text, tag, contents):
replacement = '\n.. START_%s\n\n%s\n\n.. END_%s\n' % (tag, contents, tag)
pattern = r'\n\.\. START_%s\n.*\n\.\. END_%s\n' % (tag, tag)
return re.sub(pattern, '%s', text, flags=re.S) % replacement
def indent(text, columns, indent_first_line=True):
indent_str = ' ' * columns
s = re.sub(r'\n([^\n])', '\n' + indent_str + '\\1', text, flags=re.S)
if not indent_first_line or s.startswith('\n'):
return s
return indent_str + s
def get_help_output():
args = ["clang-format", "--help"]
cmd = subprocess.Popen(args, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
out, _ = cmd.communicate()
out = out.decode(sys.stdout.encoding)
return out
def get_help_text():
out = get_help_output()
out = re.sub(r' clang-format\.exe ', ' clang-format ', out)
out = '''.. code-block:: console
$ clang-format -help
''' + out
out = indent(out, 2, indent_first_line=False)
return out
def validate(text, columns):
for line in text.splitlines():
if len(line) > columns:
print('warning: line too long:\n', line, file=sys.stderr)
help_text = get_help_text()
validate(help_text, 95)
with open(DOC_FILE) as f:
contents = f.read()
contents = substitute(contents, 'FORMAT_HELP', help_text)
with open(DOC_FILE, 'wb') as output:
output.write(contents.encode())
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