Lightning-fast project-wide find/replace with git grep and sed -- with confirm option.

.profile fragment

gg_replace() {
  if [[ "$#" == "0" ]]; then
    echo 'Usage:'
    echo '  gg_replace term replacement file_mask'
    echo '  gg_replace [-c] term replacement file_mask'
    echo
    echo 'Options:'
    echo '  -c == confirm. Allows you to interactively confirm each modification.'
    echo
    echo 'Example:'
    echo '  gg_replace cappuchino cappuccino *.html'
    echo
  else
    confirm=0
    if [[ "$1" = "-c" ]]; then
      confirm=1
      shift
    fi

    find=$1; shift
    replace=$1; shift

    ORIG_GLOBIGNORE=$GLOBIGNORE
    ORIG_IFS=$IFS
    GLOBIGNORE=*.*
    IFS=''
    
    if [[ "$#" = "0" ]]; then
      set -- ' ' $@
    fi

    while [[ "$#" -gt "0" ]]; do
      for file in `git grep -l $find -- $1`; do
        if [[ "$confirm" -eq "1" ]]; then
          if [[ "$SHELL" == *zsh* ]]; then
            echo -n "${file} | Replace? [y/n]"
            read -q REPLY
          else
            read -p "${file} | Replace? [y/n] " -n 1 -r
          fi
          if [[ $REPLY =~ ^[Yy]$ ]]; then
            sed -i '' -e "s/$find/$replace/g" $file
          fi
        else
          echo "doNOTconfirm"
          sed -i '' -e "s/$find/$replace/g" $file
        fi
      done
      shift
    done

    GLOBIGNORE=$ORIG_GLOBIGNORE
    IFS=$ORIG_IFS
  fi
}