Add script to dump file extensions

Scripts/dump-known-file-extensions.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+
+import json
+import os
+import plistlib
+import re
+import subprocess
+import sys
+
+
+def parse_xcspec(path):
+    # convert ASCII plist to XML format and read as string
+    xml_string = subprocess.check_output([
+        'plutil', '-convert', 'xml1', '-o', '-', '--', path])
+    return plistlib.readPlistFromString(xml_string)
+
+
+def extract_extensions(path, into={}):
+    data = parse_xcspec(path)
+    extracted = 0
+
+    if isinstance(data, list):
+        for item in data:
+            if 'Identifier' in item and 'Extensions' in item:
+                ident = item['Identifier']
+                for ext in item['Extensions']:
+                    into[ext] = ident
+                    extracted += 1
+
+    if extracted > 0:
+        sys.stderr.write('** Extracted {} extensions from {}\n'.format(
+            extracted, path))
+
+    return into
+
+
+def run(xcode_path):
+    plugins_path = os.path.join(xcode_path, 'Contents', 'PlugIns')
+    matcher = re.compile(r'\.(xcspec|pbfilespec)$')
+    all_extensions = {}
+    for root, dirs, files in os.walk(plugins_path):
+        for file in files:
+            if matcher.search(file):
+                path = os.path.join(root, file)
+                extract_extensions(path, all_extensions)
+
+    json.dump(
+        all_extensions,
+        sys.stdout,
+        sort_keys=True,
+        indent=4,
+        separators=(',', ': ')
+    )
+
+
+if __name__ == '__main__':
+    if len(sys.argv) == 2:
+        run(sys.argv[1])
+    else:
+        sys.stderr.write('usage: {} /path/to/Xcode.app\n'.format(
+            os.path.basename(sys.argv[0])))
+        exit(1)