[Git interactive branch filter with hot reloading] Git helper script that lists remote branches sorted by their last update time. The branch list is fed into a fuzzy finder for interactive filtering and the selected branch is checked out. Finally a keyboard shortcut enables dynamic reloading of the branches after fetching the remote. #shell #fzf…

git-change.sh

#!/usr/bin/env bash

# git-change
#
# Git helper script that lists remote branches sorted by their last update time. The branch list is fed
# into a fuzzy finder for interactive filtering and the selected branch is checked out. Finally a
# keyboard shortcut enables dynamic reloading of the branches after fetching the remote.

# External dependencies:
# - fzf:          brew install fzf
# - arrow:        pip3 install arrow
# - gsed:         brew install gnu-sed
# - gstat, gdate: brew install coreutils

LIST_CMD='
	red() {
		echo "$(tput setaf 1)$1$(tput sgr0)"
	}

	green() {
		echo "$(tput setaf 2)$1$(tput sgr0)"
	}

	dim() {
		echo "$(tput setaf 8)$1$(tput sgr0)"
	}

	date_before() {
		ts="$1"
		instant="$2"
		[[ $(gdate -d@$ts --iso-8601=seconds) < $(gdate -d "$instant" --iso-8601=seconds) ]]
	}

	header() {
		last_git_fetch_ts=$(gstat -c %Y $(git rev-parse --show-toplevel)/.git/FETCH_HEAD)
		last_git_fetch_human=$(python3 -c "import arrow; print(arrow.get($last_git_fetch_ts).humanize());")
		if date_before $last_git_fetch_ts "1 hour ago"; then
			red " Last fetch was $last_git_fetch_human (CTRL-F to fetch) "
		else
			green " Last fetch was $last_git_fetch_human (CTRL-F to fetch) "
		fi
	}

	git for-each-ref \
		--sort="-authordate" --shell \
		--format="date=%(authordate:relative) ref=%(refname:lstrip=3) author=%(authorname)" \
		refs/remotes |
	while read entry; do
		eval "$entry"

		[[ $ref == HEAD ]] && continue;

		first_name=${author%% *}
		date=$(dim "$date")

		echo "$ref:$first_name:|:$date"
	done |
		column -s ":" -t |
		gsed "s/\b\(develop\|master\)\b/$(tput setaf 3)\1$(tput sgr0)/" |  # colorize protected branches
		gsed "1 i\\$(header)"
'

branch=$(eval "$LIST_CMD" | fzf --ansi --no-info --height=50% \
			--color="header:reverse" --header-lines=1 \
			--tiebreak=index \
			--bind "ctrl-f:reload(git fetch && $LIST_CMD)" \
			--nth=1,2)  # filter only by ref name & author name

if (( $? == 0 )); then
	git switch $(awk '{print $1}' <<<$branch)
fi

# vim: set ft=bash: