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

.profile fragment

  gg_replace() {
    if [[ "$#" == "0" ]]; then
      echo 'Usage:'
      echo '  gg_replace term replacement file_mask'
      echo
      echo 'Example:'
      echo '  gg_replace cappuchino cappuccino *.html'
      echo
    else
      find=$1; shift
      replace=$1; shift

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

      while [[ "$#" -gt "0" ]]; do
        for file in `git grep -l $find -- $1`; do
          sed -e "s/$find/$replace/g" -i'' $file
        done
        shift
      done

      GLOBIGNORE=$ORIG_GLOBIGNORE
    fi
  }
  gg_dasherize() {
    gg_replace $1 `echo $1 | sed -e 's/_/-/g'` $2
  }

Here's my version: https://gist.github.com/glyph/9beafa8a7b26e5ca9f6666448fa5810d

gg_replace() {
    if [[ "$#" -lt "2" ]]; then
        echo "
Usage:
  $0 term replacement file_mask
Example:
  $0 cappuchino cappuccino '*.html'
";
    else
        local find="$1"; shift;
        local replace="$1"; shift;
        git grep -zlI "${find}" -- "$@" |
            xargs -0 sed -e "s/${find}/${replace}/g" -i '' ;
    fi;
}

A few notes:

• passes shellcheck
• doesn't depend on word splitting so doesn't need to monkey with GLOBIGNORE
• supports spaces, newlines, and (apropos of dawalama's version ;-)) ~~~~~ in path names
• it still has the problem described in dwheeler's https://dwheeler.com/essays/filenames-in-shell.html section 3.3, since I couldn't figure out a quick way to make git grep prefix all its output with ./
• it's a bit faster since it doesn't spawn new sed processes quite so many times