Allocate the exact right amount of space for trayer!

Found this lovely hack over on
https://github.com/jaor/xmobar/issues/239#issuecomment-233206552.

bin/trayer-padding-icon.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+# Copied from https://github.com/jaor/xmobar/issues/239#issuecomment-233206552
+# Detects the width of running trayer-srg window (xprop name 'panel')
+# and creates an XPM icon of that width, 1px height, and transparent.
+# Outputs an <icon>-tag for use in xmobar to display the generated
+# XPM icon. 
+#
+# Run script from xmobar:
+# `Run Com "/where/ever/trayer-padding-icon.sh" [] "trayerpad" 10`
+# and use `%trayerpad%` in your template.
+
+
+# Function to create a transparent Wx1 px XPM icon
+create_xpm_icon () {
+    timestamp=$(date)
+    pixels=$(for i in `seq $1`; do echo -n "."; done)
+
+    cat << EOF > "$2"
+/* XPM *
+static char * trayer_pad_xpm[] = {
+/* This XPM icon is used for padding in xmobar to */
+/* leave room for trayer-srg. It is dynamically   */
+/* updated by by trayer-padding-icon.sh which is run  */
+/* by xmobar.                                     */
+/* Created: ${timestamp} */
+/* <w/cols>  <h/rows>  <colors>  <chars per pixel> */
+"$1 1 1 1",
+/* Colors (none: transparent) */
+". c none",
+/* Pixels */
+"$pixels"
+};
+EOF
+}
+
+# Width of the trayer window
+width=$(xprop -name panel | grep 'program specified minimum size' | cut -d ' ' -f 5)
+
+# Icon file name
+iconfile="/tmp/trayer-padding-${width}px.xpm"
+
+# If the desired icon does not exist create it
+if [ ! -f $iconfile ]
+then
+    create_xpm_icon $width $iconfile
+fi
+
+# Output the icon tag for xmobar
+echo "<icon=${iconfile}/>"

bootstrap-arch.sh

@@ -140,7 +140,7 @@ laptop_stuff() {
     # driconf is supposed to help with video tearing (see http://www.apolitech.com/2017/04/20how-to-solve-video-tearing-on-intel.html)
     arch_package xf86-video-intel driconf
     # Install everything else needed for the desktop environment.
-    arch_package xorg-server xorg-xinit xorg-xsetroot xorg-xmodmap xorg-xmessage xorg-xrandr xorg-xrdb xorg-xinput
+    arch_package xorg-server xorg-xinit xorg-xsetroot xorg-xmodmap xorg-xmessage xorg-xrandr xorg-xrdb xorg-xinput xorg-xprop
     arch_package xmonad xmonad-contrib xmobar
     arch_package feh wmname network-manager-applet alsa-utils maim xclip numlockx xsel xdotool slop byzanz dunst
     arch_package termite chromium

xmobarrc

@@ -2,13 +2,14 @@ Config {
        font = "xft:Ubuntu Mono Regular:size=6:bold:antialias=true"
        , bgColor = "black"
        , fgColor = "grey"
-       , position = TopW L 90
+       , position = TopW L 100
        , commands = [ Run Cpu ["-L","3","-H","50","--normal","green","--high","red"] 10
                     , Run Memory ["-t","Mem: <usedratio>%"] 10
                     , Run Date "%a %b %_d %l:%M" "date" 10
 
                     , Run Com "get_volume.py" [] "myvolume" 10
                     , Run Com "get_bathroom_status.sh" [] "h4bathroom" 100
+                    , Run Com "trayer-padding-icon.sh" [] "trayerpad" 100
                     -- battery monitor
                     , Run Battery        [ "--template" , "Batt: <acstatus>"
                                          , "--Low"      , "10"        -- units: %
@@ -29,5 +30,5 @@ Config {
                     ]
        , sepChar = "%"
        , alignSep = "}{"
-       , template = "%StdinReader% }{ %h4bathroom%Vol: %myvolume% | %battery% | %cpu% | %memory% <fc=#ee9a00>%date%</fc>"
+       , template = "%StdinReader% }{ %h4bathroom%Vol: %myvolume% | %battery% | %cpu% | %memory% <fc=#ee9a00>%date%</fc> %trayerpad%"
        }