#!/bin/sh

# Git Trach, track the state of multiple repos from a single file.

# dependencies:
# - git
# - $EDITOR: -e

repos=$HOME/sync/share/git-track.txt
# prevent file not found errors
touch "$repos" || exit 1

help() {
	cat >&2 <<EOF
usage: gt [OPTION]
-a PATH         add repo 
-s              update and show status of each repo
-c COMMAND      run 'git COMMAND' in each repo
-h              show this help
-l              list repos
-e 		edit repos in \$EDITOR
-f FILE         use FILE as list of repos
EOF
}

# fetch repository prettily, outputs nothing if failed
fetch() {
	# fetch with one-line printing of progress
	git fetch --progress 2>/dev/null | while read -r line; do # \r\033[0K : clear current line
		printf >&2 '\r\033[0K%s' "$line"
	done
}

# Print repositories prettily
# This function function prints animations (eg. clearing the line)
# to stderr and the final status line is outputted to stdout.
status() {
	while read -r repo; do
		repo_pretty="$(printf '%s' "$repo" | sed "s@$HOME@~@")"

		if [ ! -d "$repo" ]; then
			printf '%s missing\n' "$repo_pretty"
			continue
		fi

		# absolute path
		cd "$repo"

		# replace line with status
		printf >&2 '\r\033[0K'

		status="$(git status --porcelain 2>/dev/null |
			awk '{print $1}' |
			sort | uniq | tr -s '?' |
			tr -d '\n')"
		remote="$(git branch -v 2>/dev/null |
			sed '/^*/!d;s/ahead/↑/;s/behind/↓/;s/[^↓↑]*//g')"

		printf '%s %s %s\n' "$repo_pretty" "$status" "$remote"
	done <"$repos"
}

# run git command in each repo
# $1: command
repos_cmd() {
	while read -r repo; do
		if [ ! -d "$repo" ]; then
			printf '%s missing\n' "$repo_pretty"
			continue
		fi

		repo_pretty="$(printf '%s' "$repo" | sed "s@$HOME@~@")"
		printf ''\''%s'\'' in %s' "$1" "$repo_pretty"
		(
			cd "$repo"
			git "$1" >/dev/null 2>&1
			[ $? -gt 0 ] && s="x" || s="o"
			printf '\r\033[0K%s: %s\n' "$repo_pretty" "$s"
		)
	done <"$repos"
}

# no options
if [ -z "$1" ]; then
	help
	exit 1
fi

while getopts ":a:c:f:lshe" opt; do
	case "$opt" in
	a)
		cd "$OPTARG" || exit 1
		r="$(git rev-parse --show-toplevel)"
		[ "$r" ] || exit 2

		if grep "$r" "$repos" >/dev/null 2>&1; then
			printf >&2 'added already.\n'
			exit 2
		fi

		printf '%s\n' "$r" >>"$repos"

		printf >&2 'added.\n'
		;;
	c)
		f_command=1
		f_arg="$OPTARG"
		;;
	s) f_status=1 ;;
	l) cat "$repos" ;;
	e) $EDITOR "$repos" ;;
	f) repos="$OPTARG" ;;
	h) help ;;
	:)
		printf >&2 -- '-%s requires argument\n' "$OPTARG"
		exit 1
		;;
	?)
		printf >&2 -- 'Invalid option: -%s\n' "$OPTARG"
		exit 1
		;;
	esac
done

# commands hereafter must happen in order

[ "$(wc -l <"$repos")" -gt 0 ] || exit 0

if [ "$f_command" ]; then
	repos_cmd "$f_arg"
fi

if [ "$f_status" ]; then
	status
fi

# eval "herbe $(status | sed 's/"/\"/g;s/.*/"&"/' | tr '\n' ' ')"