[gtk-doc] tools: add a pre-commit check for the python code

[Stefan Sauer <stefkost src gnome org>]

commit 384a053cbf6bb407c75d2b7cf40638bb94d32bd8
Author: Stefan Sauer <ensonic users sf net>
Date:   Wed Apr 5 20:20:49 2017 +0200

    tools: add a pre-commit check for the python code

 tools/git-pre-commit |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/tools/git-pre-commit b/tools/git-pre-commit
new file mode 100755
index 0000000..2b1e189
--- /dev/null
+++ b/tools/git-pre-commit
@@ -0,0 +1,18 @@
+#!/bin/sh
+# git hook to ensure code style
+# cp tools/git-pre-commit .git/hooks/pre-commit
+
+which >/dev/null pep8 || (echo "please install pep8"; exit )
+files=$(git diff --name-only --staged --diff-filter=ACMRTUXB | egrep "*.py$")
+
+if test -n "$files"; then
+  pep8 --max-line-length=120 $files
+  res=$?
+  if [ $res -ne 0 ]; then
+    echo
+    autopep8 --max-line-length=120 --diff $files
+    echo
+    echo "To fix run: autopep8 --max-line-length=120 -i $files"
+  fi
+  exit $res
+fi