Git pre-commit hook

pre-commit

#!/bin/sh

# A JavaScript focussed git pre-commit hook
#
# It ensures that any files containing console.log() or alert() calls aren't able to be committed.
# It also ensures that all JavaScript passes JSHint(which is assumed to be installed). A static code analysis tool which detects errors and potential issues from smelly JS - see http://www.jshint.com/ for more details
#
# Written by Damian Nicholson - @damian

if git rev-parse --verify HEAD >/dev/null 2>&1
then
  against=HEAD
else
  # Initial commit: diff against an empty tree object
  against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

# Setting up error counters
SYNTAX_ERROR_COUNT=0
NAUGHTY_JS_COUNT=0

# Find all javascript files in the diff
for FILE in `git diff-index --name-only ${against} -- | grep "\.js"`; do

  # Prevent any console.log() or alerts from being committed
  naughty_stuff=`grep -inR "console\.\|alert(" ${FILE}`

  # TODO: Find a better way to determine the count of naughty js left in
  naughty_stuff_length=`echo ${#naughty_stuff}`
  naughty_stuff_count=`echo ${naughty_stuff} | wc -l`
  if [ ${naughty_stuff_length} -ne 0 -a ${naughty_stuff_count} -ne 0 ]; then
    NAUGHTY_JS_COUNT=`expr $NAUGHTY_JS_COUNT + 1`
    echo "$FILE: line $naughty_stuff"
  fi

  # Run the jshint tool against it
  lint=`jshint ${FILE}`

  # If jshint returns a none empty string print out the error and increment
  # the error count
  if [ ${#lint} -ne 0 ]; then
    echo ${lint}
    SYNTAX_ERROR_COUNT=`expr $SYNTAX_ERROR_COUNT + 1`
  fi

done

echo "\n"
if [ ${SYNTAX_ERROR_COUNT} -ne 0 ]; then
  echo "$SYNTAX_ERROR_COUNT syntax errors."
fi

if [ ${NAUGHTY_JS_COUNT} -ne 0 ]; then
  echo "$NAUGHTY_JS_COUNT instances of console.log() or alert() found."
fi

# If any error count isn't zero - no dice
if [ ${NAUGHTY_JS_COUNT} -ne 0 ] || [ ${SYNTAX_ERROR_COUNT} -ne 0 ]; then
  exit 1;
fi

exit 0;