#!/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"

help() {
    >&2 cat <<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
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 
        	# \r\033[0K : clear current line
        	do >&2 printf '\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@~@" )"

        # absolute path
	cd "$repo" 

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

	status="$(git status --porcelain 2> /dev/null | awk '{print $1}' | uniq | tr -d '\n')"
	remote="$(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
# $1: command
repos_cmd() {
    while read -r repo
    do
        repo_pretty="$(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
				>&2 printf 'added already.\n'
				exit 2
			fi

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

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