add pre-commit git hook

setup/git_pre_commit_hook.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+import os
+import subprocess
+import sys
+
+base = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+os.chdir(base)
+setup_py = os.path.realpath('./setup.py')
+
+
+def testfile(file):
+    def t(f, start, end, exclude_end=None):
+        return f.startswith(start) and f.endswith(end) and not f.endswith(exclude_end) if exclude_end else True
+    if t(file, ('src/odf', 'src/calibre'), '.py', exclude_end='_ui.py'):
+        return True
+    if t(file, 'recipes', '.recipe'):
+        return True
+    if t(file, 'src/pyj', '.pyj'):
+        return True
+    return False
+
+
+output = subprocess.check_output((
+    'git', 'diff', '--staged', '--name-only', '--no-ext-diff', '-z',
+    # Everything except for D
+    '--diff-filter=ACMRTUXB',
+)).decode('utf-8')
+
+output = output.strip('\0')
+if not output:
+    output = []
+else:
+    output = output.split('\0')
+
+filenames = tuple(filter(testfile, output))
+if not filenames:
+    sys.exit(0)
+
+check_args = [sys.executable, './setup.py', 'check', '--no-editor']
+# let's hope that too many arguments do not hold any surprises
+for f in filenames:
+    check_args.append('-f')
+    check_args.append(f)
+
+returncode = subprocess.call(check_args)
+sys.exit(returncode)