Diffs a C++ file, or directory of C++ files with the results of running those files through clang-format.

compare-format.py

#! /usr/bin/env python

# Author: Joseph Lisee <[email protected]>
# Purpose: Test out various clang formatting options

# Usage: compare-format.py <diff-tool> <input-path> [<clang-options]
# Example:
#    compare-format.py meld file.cpp "-style={BasedOnStyle: Google, IndentWidth: 4}"

import os
import subprocess
import sys
import tempfile

# Generate a temporary file
diff_tool = sys.argv[1].split(' ')
input_path = sys.argv[2]
clang_opts = sys.argv[3:]

# Get the list of files to process
valid_extension = set(['hh', 'h', 'hpp', 'c++', 'c', 'cpp', 'cc', 'C', 'H'])

if os.path.isdir(input_path):
    to_process = []
    for root, dirs, files in os.walk(input_path, topdown=True):
        for name in files:
            _, ext = os.path.splitext(name)

            if ext[1:] in valid_extension:
                to_process.append(os.path.join(root, name))
else:
    to_process = [input_path]

# Process our files:
for file_path in to_process:
    #print file_path
    with tempfile.NamedTemporaryFile() as ofile:
        # Run clang format sending output to temp
        subprocess.check_call(['clang-format', file_path] + clang_opts,
                              stdout=ofile)

        # Run meld to compare the results
        subprocess.call(diff_tool + [file_path, ofile.name])