if git-add *.scss, then compile.

pre-commit-compile-css

#!/bin/sh

NAME=$(git branch | grep '*' | sed 's/* //')

# don't run on rebase
if [ $NAME != '(no branch)' ]; then

  EDITSCSS=$(git --no-pager diff --diff-filter=AM --name-only --no-color --cached | grep 'scss' | wc -l)

  if [ $EDITSCSS -ne 0 ]; then
    git stash -q --keep-index

    # compile css
    grunt css

    RETVAL=$?

    if [ $RETVAL -ne 0 ]; then
      git stash pop -q
      exit 1
    fi

    git add .
    git stash pop -q
  fi
fi