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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 argparse
import os
import re
import subprocess
import sys
PARENT_DIR = os.path.join(os.path.dirname(__file__), "..")
DOC_FILE = os.path.join(PARENT_DIR, "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, replacement, text, flags=re.S)
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 = [binary, "--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)
p = argparse.ArgumentParser()
p.add_argument("-d", "--directory", help="directory of clang-format")
p.add_argument("-o", "--output", help="path of output file")
opts = p.parse_args()
binary = "clang-format"
if opts.directory:
binary = opts.directory + "/" + binary
help_text = get_help_text()
validate(help_text, 100)
with open(DOC_FILE, encoding="utf-8") as f:
contents = f.read()
contents = substitute(contents, "FORMAT_HELP", help_text)
with open(
opts.output if opts.output else DOC_FILE, "w", newline="", encoding="utf-8"
) as f:
f.write(contents)
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