Add file classification package

pre_commit/file_classifier/extensions.py

@@ -0,0 +1,28 @@
+"""List of known filename to file type mappings.
+
+The list consists of tuples of (filename regex, list of types).
+
+Most of these are extensions (e.g. *.py -> python), but some just use the
+filename (e.g. Makefile -> make).
+"""
+KNOWN_EXTENSIONS = [
+    (r'\.js$', ['javascript']),
+    (r'\.json$', ['json']),
+    (r'\.py$', ['python']),
+    (r'\.rb$', ['ruby']),
+    (r'\.sh$', ['shell']),
+    (r'\.e?ya?ml$', ['yaml']),
+    (r'\.pp$', ['puppet']),
+    (r'\.erb$', ['erb']),
+    (r'\.json$', ['json']),
+    (r'\.xml$', ['xml']),
+    (r'\.c$', ['c']),
+    (r'^Makefile$', ['make']),
+    (r'\.mk$', ['make']),
+    (r'\.png$', ['png']),
+    (r'\.gif$', ['gif']),
+    (r'\.svg$', ['svg']),
+    (r'\.css$', ['css']),
+    (r'\.html?$', ['html']),
+    (r'\.php\d?$', ['php']),
+]