jscs-pre-commit

#!/bin/bash

# Runs JSCS style checker using definitions in `.jscs.json` 
# See https://github.com/mdevils/node-jscs for explanation of tests 
#
# to style check your JS
# 1) ln -s ../../jscs-pre-commit .git/hooks/pre-commit
# 2) npm install jscs -g

# Adapted from an original script by Timothée Boucher
# http://tech.adroll.com/blog/web/2014/03/05/adding-jscs-to-your-commit-hook.html  

export JSCS_PATH=`which jscs`

# Extract staged files to a temp directory
TMPDIR=
TMPFILE=
if [ "$IS_LINUX" == "true" ]; then
    TMPFILE=`mktemp jscs_tmp_XXXXXX`
    TMPDIR=`mktemp -d jscs_tmp_XXXXXX`
else
    TMPFILE=`mktemp -t tmp/jscs_tmp_XXXXXX`
    TMPDIR=`mktemp -t tmp/jscs_tmp -d`
fi
git diff --cached --name-only --diff-filter=ACMR | xargs git checkout-index --prefix=$TMPDIR/ --
 
# Check JavaScript code style
RUN_JSCS=1
TOTAL_ERRORS=0
PLURAL_SUFFIX= 
 
JSFILES=$(git diff-index --name-status --cached HEAD | grep -v ^D | egrep '.js$' | cut -c3-)
if [ -z "$JSFILES" ]; then
    # No JavaScript file changed for this commit
    RUN_JSCS=0
elif [ -z "$JSCS_PATH" ]; then
    echo -e "\033[0;31mIf you \033[1;34mnpm install jscs -g\033[0;31m I'll check your JS style\033[0;0m"
    RUN_JSCS=0
fi
 
# Run JSCS
if [ $RUN_JSCS -ne 0 ]; then
    echo -e "\033[0;34mChecking JS style...\033[0;0m"
    OUT=`$JSCS_PATH -r text $TMPDIR`
    CODE=$?
    # Erase last output line
    # echo -ne '\r\033[K'
    if [ $CODE -ne 0 ]; then
        # Remove temp dir from output and color the filename
        OUT=`echo "$OUT" | sed "s,$TMPDIR/\([^ ]*\),\`echo -e \"\033[0;34m\1\033[0m\"\`,"`
        TOTAL_ERRORS=`echo -e "$OUT" | sed 's/[^0-9]//g' | tail -1`
        # echo output minus last line
        echo "$OUT" | sed '$ d'
        if [ $TOTAL_ERRORS -ne 1 ]; then
          PLURAL_SUFFIX="s"
        fi 
        echo -e "\033[0;31m$TOTAL_ERRORS code style error$PLURAL_SUFFIX found.\033[0;0m"
        echo "Please fix and re-commit."
        echo -e "Need to commit right away? commit with the \033[0;34m-n\033[0m flag"
        rm -Rf $TMPDIR $TMPFILE
        exit $CODE
    else
        echo -e "\033[0;32mNo JS code style errors found.\033[0;0m"
    fi
fi
 
# Clean up
rm -Rf $TMPDIR $TMPFILE