Merge pull request #259 from broadinstitute/sy-whitespace-cleanup

Add autopep8 pre-commit hook.

contrib/pre-commit

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+status=0
+touched_python_files=$(git diff --cached --name-only | grep -E '\.py$')
+if [ -n "$touched_python_files" ]; then
+    options="\
+      --aggressive \
+      --exclude='tools/build/*' \
+      --select=W291,W293 \
+      --max-line-length=120 \
+    "
+
+    output=$(autopep8 -d $options "${touched_python_files[@]}")
+    status=$?
+
+    if [ -n "$output" ]; then
+        autopep8 -i -j 0 $options "${touched_python_files[@]}"
+        echo ">>> autopep8 edited some files <<<"
+        exit 1
+    fi
+fi
+
+exit $status