[devtools] add clang-format.py

Author: MarcoFalke

contrib/devtools/clang-format.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+'''
+Wrapper script for clang-format
+
+Copyright (c) 2015 MarcoFalke
+Copyright (c) 2015 The Bitcoin Core developers
+Distributed under the MIT software license, see the accompanying
+file COPYING or http://www.opensource.org/licenses/mit-license.php.
+'''
+
+import os
+import sys
+import subprocess
+
+tested_versions = ['3.6.0', '3.6.1', '3.6.2'] # A set of versions known to produce the same output
+accepted_file_extensions = ('.h', '.cpp') # Files to format
+
+def check_clang_format_version(clang_format_exe):
+    try:
+        output = subprocess.check_output([clang_format_exe, '-version'])
+        for ver in tested_versions:
+            if ver in output:
+                print "Detected clang-format version " + ver
+                return
+        raise RuntimeError("Untested version: " + output)
+    except Exception as e:
+        print 'Could not verify version of ' + clang_format_exe + '.'
+        raise e
+
+def check_command_line_args(argv):
+    required_args = ['{clang-format-exe}', '{files}']
+    example_args = ['clang-format-3.x', 'src/main.cpp', 'src/wallet/*']
+
+    if(len(argv) < len(required_args) + 1):
+        for word in (['Usage:', argv[0]] + required_args):
+            print word,
+        print ''
+        for word in (['E.g:', argv[0]] + example_args):
+            print word,
+        print ''
+        sys.exit(1)
+
+def run_clang_format(clang_format_exe, files):
+    for target in files:
+        if os.path.isdir(target):
+            for path, dirs, files in os.walk(target):
+                run_clang_format(clang_format_exe, (os.path.join(path, f) for f in files))
+        elif target.endswith(accepted_file_extensions):
+            print "Format " + target
+            subprocess.check_call([clang_format_exe, '-i', '-style=file', target], stdout=open(os.devnull, 'wb'), stderr=subprocess.STDOUT)
+        else:
+            print "Skip " + target
+
+def main(argv):
+    check_command_line_args(argv)
+    clang_format_exe = argv[1]
+    files = argv[2:]
+    check_clang_format_version(clang_format_exe)
+    run_clang_format(clang_format_exe, files)
+
+if __name__ == "__main__":
+    main(sys.argv)