unixorn/git-extra-commands

#!/usr/bin/env bash
#
# Original source: https://bluz71.github.io/2018/11/26/fuzzy-finding-in-bash-with-fzf.html

set -o pipefail
if [[ -n "$DEBUG" ]]; then
  set -x
fi

function fail() {
  printf '%s\n' "$1" >&2  ## Send message to stderr. Exclude >&2 if you don't want it that way.
  exit "${2-1}"  ## Return a code specified by $2 or 1 by default.
}

function has() {
  which "$@" > /dev/null 2>&1
}

if has bat; then
  git-fzf-add() {
    selections=$(
      git status --porcelain | \
      fzf --ansi \
        --preview 'if (git ls-files --error-unmatch {2} &>/dev/null); then
                    git diff --color=always {2}
                  else
                      bat --color=always --line-range :500 {2}
                  fi'
      )
    if [[ -n "$selections" ]]; then
      # shellcheck disable=SC2046
      git add --verbose $(echo "$selections" | cut -c 4- | tr '\n' ' ')
    fi
  }
else
  # Use head since bat is missing
  git-fzf-add() {
    selections=$(
      git status --porcelain | \
      fzf --ansi \
        --preview 'if (git ls-files --error-unmatch {2} &>/dev/null); then
                    git diff --color=always {2}
                  else
                      head -100 {2}
                  fi'
      )
    if [[ -n "$selections" ]]; then
      # shellcheck disable=SC2046
      git add --verbose $(echo "$selections" | cut -c 4- | tr '\n' ' ')
    fi
  }
fi

if ! has fzf; then
  fail "You need fzf (https://github.com/junegunn/fzf) to use this script. "
fi

# shellcheck disable=SC2068
git-fzf-add $@