#!/bin/bash
set -e

defshow=' '
showopt () {
	eval "showopt_$1=$2"
}
defshow () {
	showopt $1 $2
	eval "defshow+='$2 '"
}
defshow	B --branches
defshow	R --remotes
showopt	T --tags
showopt	A --all

opts=()

getshowopt () {
	eval "showopt=\$showopt_$1"
}

while [ $# -ge 1 ]; do case "$1" in

	+)	shift; defshow=''; break ;; # disable defshow

	--)
		# remaining args are paths, but we want default showing
		break
		;;
	-*)
		# some gitk option, stop parsing
		# user may have to say + to disable default showing
		break
		;;

	+*)
		arg="$1"; shift
		while true; do

			case "$arg" in
	
			+[BRTA]*)
				getshowopt ${arg:1:1}
				defshow=''; opts+=($showopt)
			;;
			+-[BRTA]*)
				getshowopt ${arg:2:1}
				defshow="${defshow/ $showopt / }"
				arg="${arg#+-?}"; continue
				;;

			+d*)	opts+=(--date-order) ;;
			+f*)	opts+=(--first-parent) ;;	

			+)	break ;;

			*)	echo >&2 "gitk wrapper: unknown + option $arg"
				exit 127
				;;

			esac

			arg="+${arg#+?}"
		done
		;;

	*)	defshow=''; break ;; # some instruction to gitk

	esac
done

exec /usr/bin/gitk "${opts[@]}" $defshow "$@"