Fast git checkout using `fzf`

git-fuzzy-checkout

#!/bin/bash

# Requires 'fzf'
# check_dependency fzf git || exit 1

HELP_TEXT="
git fuzzy-checkout

Check out branches quickly with the power of \`fzf\`.
Default view is local branches (HEADS).

Usage:
    git fuzzy-checkout [OPTIONS] <QUERY>


OPTIONS:
    -a : Show branches from heads and remotes
    -r : Show branches from remotes
    -t : Show branches from tags

    -h : Show help

QUERY:
    An optional query to immediately filter the ref list.
    This is passed to \`fzf\` as the initial query, and can be changed.

Examples
    git fuzzy-checkout             # Show branches from heads (local)

    git fuzzy-checkout LPS-12345   # Show branches that match the query 'LPS-12345':

    git fuzzy-checkout -r          # Show branches from remotes

    git fuzzy-checkout -a          # Show branches from heads and remotes

    git fuzzy-checkout -t          # Show branches from tags
"

### Determine whether to search local, remotes, or all

COMMAND_ALL="git for-each-ref refs/heads refs/remotes refs/tags"
COMMAND_HEADS="git for-each-ref refs/heads"
COMMAND_REMOTES="git for-each-ref refs/remotes"
COMMAND_TAGS="git for-each-ref refs/tags"

COMMAND="${COMMAND_HEADS}"

while getopts "ahrt" FLAGS; do
	case $FLAGS in
		a) COMMAND="${COMMAND_ALL}" ;;
		h) echo "$HELP_TEXT" && exit 0 ;;
		r) COMMAND="${COMMAND_REMOTES}" ;;
		t) COMMAND="${COMMAND_TAGS}" ;;
		*) exit 1 ;;
	esac
done

shift $((OPTIND - 1))

### Set up display

DELIMITER=" :: "

FZF_HEADER="""
enter:            check out branch
alt-space:        toggle preview window (shows 'git log' of the selected branch)
alt-bspace:       delete branch
alt-y:            copy branch name to clipboard
alt-[a h r t]:    show [ALL HEADS REMOTES TAGS]

"""
GIT_BRANCH_DISPLAY_FORMAT="%(committerdate:short)${DELIMITER}%(color:yellow)%(refname:short)%(color:reset)"
RELOAD_SUFFIX="--color=always --format='${GIT_BRANCH_DISPLAY_FORMAT}' --sort=-committerdate"

### Go

${COMMAND} \
	--color=always \
	--format="${GIT_BRANCH_DISPLAY_FORMAT}" \
	--sort=-committerdate \
	|
fzf \
	--ansi \
	\
	--bind="alt-space:toggle-preview" \
	--bind="enter:execute(git checkout {2})+accept" \
	--bind="alt-bspace:execute-silent(git branch -D {+2})+reload:${COMMAND} ${RELOAD_SUFFIX}" \
	--bind="alt-y:execute(printf {+2} | pbcopy)" \
	--bind="alt-l:execute(jack {+2})" \
	\
	--bind="alt-a:reload:${COMMAND_ALL} ${RELOAD_SUFFIX}" \
	--bind="alt-h:reload:${COMMAND_HEADS} ${RELOAD_SUFFIX}" \
	--bind="alt-r:reload:${COMMAND_REMOTES} ${RELOAD_SUFFIX}" \
	--bind="alt-t:reload:${COMMAND_TAGS} ${RELOAD_SUFFIX}" \
	\
	--delimiter="${DELIMITER}" \
	--exact \
	--header="${FZF_HEADER}" \
	--info="inline" \
	--multi \
	--nth=2 \
	--no-sort \
	--preview-window="down:70%:hidden" \
	--preview="git log -100 --color=always {2}" \
	--query "$*" \
	--reverse \
	;