pre-commit git hook for validation and minification of staged html files

validate-minify-pre-commit

#!/bin/sh

# Script to validate htmls, minify them, and minify css before commiting
# Exits on validation failure. Minified files, and any other website resource
# needed is copied into $DIR_TO_COPY

readonly HTML_COMPRESSOR_PATH="$(git config hooks.htmlcompressor)"
readonly YUI_COMPRESSOR_PATH="$(git config hooks.yuicompressor)"
readonly DIR_TO_COPY=minified-site #path into which to copy files 
readonly VALIDATOR="tidy"
# =============================================================================

echo "Starting git pre-commit hook..."
echo

set -e  #exit on error
set -u  #exit script if there is any uninitialized variable

err() {
  echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $@" >&2
}

if [ ! -f "$HTML_COMPRESSOR_PATH" ]; then
  err "Unable to find htmlcompressor.jar on the configuration."
  err "Please configure it with:"
  err "    git config hooks.htmlcompressor /path/to/jar"
  exit 1
fi

if [ ! -f "$YUI_COMPRESSOR_PATH" ]; then
  err "Unable to find yuicompressor-x.y.z.jar on the configuration."
  err "Please configure it with:"
  err "    git config hooks.yuicompressor /path/to/jar"
  exit 2
fi

validate_html(){
  echo "Validating: $1"
  echo "‾‾‾‾‾‾‾‾‾‾‾"
  $VALIDATOR -e $1
  echo  #For some reason tidyhtml5 is eating the first echo
  echo 
}

minify_html(){ 
  echo -n "Minifying: $1... "
  java -jar $HTML_COMPRESSOR_PATH --remove-input-attr \
    --remove-intertag-spaces --remove-quotes \
    --remove-style-attr --remove-link-attr --remove-script-attr \
    --remove-form-attr --simple-bool-attr --remove-js-protocol \
    --remove-http-protocol --remove-https-protocol \
    --remove-surrounding-spaces all $1 -o $DIR_TO_COPY/$1
  echo "done"
  echo "‾‾‾‾‾‾‾‾‾‾"
}

minify_css(){ 
  echo -n "Minifying: $1... "
  java -jar $YUI_COMPRESSOR_PATH $1 -o $DIR_TO_COPY/$1
  echo "done"
  echo "‾‾‾‾‾‾‾‾‾‾"
}

#for every file staged 
git diff --cached --name-only | while read file; do
  extension=${file: -5}
  case $extension in
    .html)
      validate_html $file
      minify_html $file
      ;;
    *.css)
      minify_css $file
      ;;
    *)
      echo -n "copying: $file... "
      cp -u --parent $file $DIR_TO_COPY
      echo "done"
      ;;
  esac
done