#!/bin/bash
# shellcheck disable=SC2059,SC2064,SC2086,SC2001,SC2016

# simple lightweight lemonbar script for use with dk

set -eE -o pipefail

bg="#3f3c6d" # background colour
fg="#a39ef1" # foreground colour
hi="#00aaaa" # highlight colour
ul=2         # underline thickness
sep="┃"      # separator text
font="-xos4-terminus-medium-r-normal--12-240-72-72-c-120-iso10646-1"
fifo="/tmp/bar.fifo"

# adjust font size based on resolution DPI
px=$(xrandr | grep ' connected' | tail -n1 | grep -o '[0-9]\+x[0-9]\+' | cut -d'x' -f2)
mm=$(xrandr | grep ' connected' | tail -n1 | grep -o '[0-9]\+mm' | tail -n1 | sed 's/mm//')
dpi=$(( (px / mm) * 25 ))
if (( dpi >= 140 )); then
	font="-xos4-terminus-medium-r-normal--20-240-72-72-c-120-iso10646-1"
elif (( dpi >= 120 )); then
	font="-xos4-terminus-medium-r-normal--16-240-72-72-c-120-iso10646-1"
elif (( dpi >= 100 )); then
	font="-xos4-terminus-medium-r-normal--12-240-72-72-c-120-iso10646-1"
fi

clock()
{
	date +"T %a %H:%M $sep"

	# sync up the clock to the minute mark
	min=$(date +"%M")
	while [[ $(date +"%M") == "$min" ]]; do
		sleep 1
	done

	while :; do
		date +"T %a %H:%M $sep"
		sleep 60
	done
}

battery()
{
	while :; do
		perc="$(cat /sys/class/power_supply/BAT0/capacity)"
		printf 'B Bat: %s%%%s\n' " ${perc}"
		sleep 60
	done
}

volume()
{
	vol="$(amixer sget Master | awk -F"[][]" '/(Mono|Left):/ { print $2 }')"
	printf 'V vol: %s%%\n' "$vol"
}

workspaces()
{
	# these will be filled out once we eval each line
	typeset name="" title="" layout="" focused=false active=false

	WS=""
	while read -r l; do
		eval "$l"
		if [[ $l =~ ^title=* ]]; then
			# default foreground, background, and underline colours
			# changing the foreground and underline based on
			# the active and focused state
			f="$fg" b="$bg" u="$fg";
			$active && u="$hi"
			if $focused; then
				# clicking the layout symbol will cycle the layout
				lyt="%{A:dkcmd set layout cycle:}${layouts[$layout]}%{A}"
				WIN="${title:0:50}"
				f="$hi"
			fi
			# clicking on a workspace name will view it
			WS="$WS%{F$f}%{B$b}%{+u}%{U$u}%{A:dkcmd ws $name:} $name %{A}%{-u}%{B-}%{F-}"
		fi
		# turn the dk JSON output into lines that can be `eval`ed one by one,
		# filling out the following fields: name, focused, active, layout, title
	done < <(dkcmd -p <<< "$1" | sed '/.*\[\|]/d; /[{}],\?/d; s/^\s*\|,$//g; /"monitor":\|"number":\|"id":/d; s/"\(.*\)": /\1=/; s/\$(/\\\$(/g; s/`/\\`/g')
	WS="$WS $sep $lyt"
}

parsefifo()
{
	# globals to simplify the workspaces call
	declare -g WS WIN

	local time vol bat net

	while read -r line; do
		case $line in
			T*) time="${line#?}" ;;
			V*) vol="${line#?}" ;;
			B*) bat="${line#?}" ;;
			N*) net="${line#?}" ;;
			'{'*) workspaces "$line" ;;
		esac
		printf "%s\n" "%{l}$sep ${WS}%{c}${WIN}%{r}${net}${bat}${vol}${time}"
	done
}

# kill the process and cleanup if we exit or get killed
trap "trap - TERM; rm -f '$fifo'; kill 0" INT TERM QUIT EXIT PIPE

# make the fifo
[ -e "$fifo" ] && rm "$fifo"
mkfifo "$fifo"

# here we dump info into the FIFO, order does not matter things are parsed
# out using the first character of the line. Click commands for left button
# can be added by passing an argument containing the command (like below)
#
# comment a line to remove the "module"
clock > "$fifo" &
battery > "$fifo" &
volume > "$fifo" &
dkcmd status type=bar > "$fifo" &

# run the pipeline
if [[ $1 == '-b' ]]; then
	parsefifo < "$fifo" | lemonbar -b -a 32 -u $ul -B "$bg" -F "$fg" -f "$font" | sh;
else
	parsefifo < "$fifo" | lemonbar -a 32 -u $ul -B "$bg" -F "$fg" -f "$font" | sh
fi

# vim:ft=sh:fdm=marker:fmr={,}