pre-commit

#!/bin/sh

##
# This script is used to lint files that are being committed (git commit).
# To prevent a commit, it returns non-zero.
#
# This script calls a node.js script with one argument: a file
# that should be used to log jshint errors. Once the node
# script is done, this script will
#  - check the return value
#  - if the return value is not 0, it will display the content
#    of the afore-mentioned log file.
#  - return 0 or 1 depending on the nodejs return value
#
# Q: Why call this script instead of calling directly the nodejs one?
# A: Because some Git client cannot find the node binary, no matter what
#    shebang is used (!#/usr/bin/env node or !#/usr/local/bin/node)
#    This script helps setting the PATH and finding node!
#
# Q: Why dump jshint errors into a log file instead of displaying them
#    directly in the nodejs script?
# A: For some reason, writing/reading to the standard output breaks once the
#    nodejs script is terminated (via process.exit). Furthermore, some Git
#    clients cannot display the standard output from a node script, but
#    manage to display one coming from a standard bash script.

OS=$(uname)
if [ "$OS" == "Darwin" -o "$OS" == "Linux" ]; then
  export PATH=/usr/bin:/bin:/sbin:/usr/local/bin:/usr/sbin
fi

NODE_BIN=`which node`
JSHINT_LOGS='.git/hooks/jshint-out.log'
NODE_MODULES_DIR='.git/hooks/node_modules'
rm -rf $JSHINT_LOGS

if [ -d "$NODE_MODULES_DIR" ]; then
  "$NODE_BIN" ".git/hooks/pre-commit.js" $JSHINT_LOGS
  RETURN_CODE=$?

  if [ $RETURN_CODE -ne 0 ]; then
    if [ -f $JSHINT_LOGS ]; then
      cat $JSHINT_LOGS
      rm -rf $JSHINT_LOGS
    fi
    exit 1
  fi
  rm -rf $JSHINT_LOGS
  exit 0
else
  echo
  echo "Some node modules are missing to commit your code."
  echo "Run the following command ONCE at the root of your repository:"
  echo "cd .git/hooks;npm install;cd -"
  echo
  exit 1
fi