polybar: Make hardcoded paths dependant from XDG

Instead of hardcoding the paths of all the scripts, use env variables
that are set in launch.sh. This way the config also works with
XDG_CONFIG_HOME not set to ~/.config.
Sadly polybar only accepts references that stand on their own.
(So something like ${env:XDG_CONFIG_HOME:~/.config}/polybar/<script>
does not work.) Hence the mess with the associative array and the
variables for every module.

.config/polybar/config

@@ -106,7 +106,7 @@ ramp-13 = 
 
 [module/battery-custom]
 type = custom/script
-exec = ~/.config/polybar/scripts/battery.sh
+exec = ${env:POLYBAR_BATTERY}
 interval = 5
 
 ;#################################################
@@ -128,15 +128,15 @@ label = "%date% - %time%"
 
 [module/media]
 type=custom/script
-exec = ~/.config/polybar/scripts/media.sh
+exec = ${env:POLYBAR_MEDIA}
 interval = 1
 
 ;#################################################
 
 [module/vpn]
 type = custom/script
-exec = ~/.config/polybar/scripts/running-vpn.sh
+exec = ${env:POLYBAR_VPN}
-click-left = ~/.config/polybar/scripts/pub-ipv4.sh &
+click-left = ${env:POLYBAR_VPN_CLICK_LEFT}
 interval = 5
 
 ;#################################################
@@ -156,13 +156,13 @@ label-disconnected = %{A1:gnome-terminal -x nmtui connect:} %ifname% disconnecte
 
 [module/bluetooth]
 type = custom/script
-exec = ~/.config/polybar/scripts/bluetooth.sh
+exec = ${env:POLYBAR_BLUETOOTH}
 tail = true
-click-left = ~/.config/polybar/scripts/bluetooth.sh --toggle &
+click-left = ${env:POLYBAR_BLUETOOTH_CLICK_LEFT}
 
 ;#################################################
 
 [module/powermenu]
 type = custom/text
-content = %{A1:~/.config/rofi/powermenu.sh &:}%{T2}...%{T-}%{A}
+content = ${env:POLYBAR_POWERMENU}
 

.config/polybar/launch.sh

@@ -1,4 +1,21 @@
-#!/bin/sh
+#!/bin/bash
+
+XDG_CONF="${XDG_CONFIG_HOME:-$HOME/.config}"
+BASE_DIR="$XDG_CONF/polybar"
+
+declare -A module_flags
+module_flags=(
+	[battery]="$BASE_DIR/scripts/battery.sh"
+	[bluetooth]="$BASE_DIR/scripts/bluetooth.sh"
+	[bluetooth_click_left]="$BASE/scripts/bluetooth.sh --toggle &"
+	[media]="$BASE_DIR/scripts/media.sh"
+	[powermenu]="%{A1:$XDG_CONF/rofi/powermenu.sh &:}%{T2}...%{T-}%{A}"
+	[vpn]="$BASE_DIR/scripts/vpn.sh"
+	[vpn_click_left]="$BASE_DIR/scripts/pub_ipv4.sh &"
+)
+for module in "${!module_flags[@]}"; do
+	export POLYBAR_${module^^}="${module_flags[$module]}"
+done
 
 # if there is no running instance
 if ! pgrep -ax polybar >/dev/null 2>&1; then
@@ -9,7 +26,7 @@ if ! pgrep -ax polybar >/dev/null 2>&1; then
 		export TRAY_POS=none
 		[ "$m" != "$primary" ] || export TRAY_POS=right
 		export MONITOR="$m"
-		polybar --reload -c "${XDG_CONFIG_HOME:-$HOME/.config}/polybar/config" main &
+		polybar --reload -c "$BASE_DIR/config" main &
 	done
 
 	echo "Polybar launched..."