vdotfiles/bspwm/panel

#!/usr/bin/env zsh
source $bspwm_config_dir/common

cleanup() {
	jobs=${${jobstates##*:*:}%=*}

	if [[ "$jobs" ]]; then
		eval "kill $jobs"
	fi

	bspc config top_padding 0
}

get_line() {
	declare counter=0 line=$1

	while read; do
		if (( counter == line )); then
			printf '%s\n' "$REPLY"
			return 0
		fi

		(( counter++ ))
	done
}

parse_fifo_data() {
	declare msg desktop_spec
	declare -g win_name misc bspwm_status

	while read; do
		case "$REPLY" in
			cmd::*)
				read -r cmd args <<< "${REPLY#cmd::}"

				case "$cmd" in
					redraw)
						printf 'Redraw triggered\n'
						sleep 1
						printf '%s\n' "$msg"
					;;
					respawn)
						printf 'Dying...\n'
						sleep 1
						rexec
					;;
					run)
						$args
						rexec
					;;
				esac
			;;
			updates::*) updates="${REPLY#*updates::}";;
			date::*) date="${REPLY#*date::}";;
			T*)
				if (( panel_taskbar_enable )); then
					unset win_title
					unset taskbar taskbar_windows taskbar_length

					panel_taskbar_max_title_current=$panel_taskbar_max_title

					while read -r _ _ _ wid _ _ _ _ focus; do
						if [[ "$wid" =~ [0-9]x[0-9A-F] ]]; then
							if [[ "$focus" == '*' ]]; then
								taskbar_windows+=( "$wid::F" )
							else
								taskbar_windows+=( "$wid::u" )
							fi
						fi
					done < <( bspc query -T -d focused )

					taskbar_windows_n="${#taskbar_windows[@]}"

					if (( taskbar_windows_n )); then
						until (( taskbar_length )) && (( taskbar_length <= panel_taskbar_max_length )); do
							unset taskbar
							taskbar_length=$(( (taskbar_windows_n * 2) + 2 ))
							
							for w in "${taskbar_windows[@]}"; do
								IFS='::' read -r wid _ state <<< "$w"
								win_title=$( xtitle -f '%s' -t "${panel_taskbar_max_title_current}" "$wid" )
								win_title_length="${#win_title}"

								taskbar_length=$(( taskbar_length + win_title_length ))

								if [[ "$state" == 'F' ]]; then
									taskbar+=" %{B${colors_bg_focused}}%{F${colors_bg_normal}}%{F-} ${win_title} %{B-}%{F${colors_bg_focused}}%{F-}"
								else
									taskbar+=" %{A:bspc window -f ${wid}:}  ${win_title}  %{A}"
								fi
							done
								
							(( panel_taskbar_max_title_current-- ))
						done
					fi
				else
					win_title="${REPLY#*T}"
					if [[ "$win_title" ]]; then
						taskbar=" %{B${colors_bg_focused}}%{F${colors_bg_normal}}%{F-} ${win_title} %{B-}%{F${colors_bg_focused}}%{F-}"
					else
						unset taskbar
					fi
				fi
			;;
			WM*)
				unset desktop_spec
				IFS=':' read -A bspwm_status <<< "$REPLY"

				for i in "${bspwm_status[@]}"; do
					if [[ "$i" =~ ^[oOfFuU].+ ]]; then
						n="${i#*[oOfFuU]}"

						case "$i" in
							O*|F*|U*) desktop_spec+="%{B${colors_bg_focused}} $n %{B-}";;
							u*) desktop_spec+="%{B${colour_urgent}}%{A:bspc desktop -f $n:} $n %{A}%{B-}";;
							o*) desktop_spec+="%{B-}%{A:bspc desktop -f $n:} $n %{A}";;
							f*)
								(( panel_show_empty_tags )) && {
									desktop_spec+="%{B-} $n "
								}
							;;
						esac
					fi
				done

				read _ _ _ _ layout float _ < <( bspc query -T -d focused | get_line 1 )

				if [[ "$float" == 'f' ]]; then
					float_flag='f'
				else
					float_flag=''
				fi

				case "$layout" in
					T) layout_flag='t';;
					M) layout_flag='m';;
				esac

				desktop_spec+=" %{A:bsptl:}[${layout_flag}${float_flag}]%{A}"
			;;
		esac

		msg="$desktop_spec"

		[[ "$taskbar" ]] && { msg+="$taskbar"; }

		msg+="%{r}%{F${colors_bg_focused}}%{F-}%{B${colors_bg_focused}} $updates $date "
		msg+='%{B-}%{F-}'

		printf '%s\n' "$msg"
	done < "$panel_fifo"
}

misc_status() {
	declare ip msg date

	while sleep 1; do
		date=$( date +%A,\ %Y.%m.%d\ %H:%M:%S )
		msg="[ $date ]"
		printf 'S:%s\n' "$msg"
	done
}

rexec() {
	eval "kill ${${jobstates##*:*:}%=*[@]}"
	exec "$0"
}

function panel_geometry
{
	xrandr|grep -Eo '[[:digit:]]+x[[:digit:]]+\+[[:digit:]]+\+[[:digit:]]+'|awk -F'x|+' '{print $1,$2,$3,$4}'|read -A screen_geometry
	((panel_h)) || panel_h=20
	((panel_w)) || panel_w=$screen_geometry[2]
	((panel_l)) || panel_l=$screen_geometry[3]
	((panel_d)) || panel_d=$screen_geometry[4]
}

main() {
	trap 'cleanup' EXIT TERM INT
	trap 'rexec' HUP

	[[ -e "$panel_fifo" ]] && {
		rm "$panel_fifo" || { return 1; }
	}

	mkfifo "$panel_fifo"

	if (( panel_taskbar_enable )); then
		xtitle -s -t "$panel_taskbar_max_title" -f 'T%s' > "$panel_fifo" &
	else
		xtitle -s -f 'T%s' > "$panel_fifo" &
	fi

	bspc control --subscribe > "$panel_fifo" &
	$bspwm_config_dir/panel_status &

	bspc config top_padding "$(( panel_h + bspwm_window_gap ))"

	parse_fifo_data | lemonbar -g "${panel_w}x${panel_h}+${panel_l}+${panel_d}" \
                         -f "$font_norm" \
                         -f "$font_bold" \
                         -F "$colors_fg_normal" \
                         -B "$colors_bg_normal" | zsh &
	wait
}

main