Pop! OS set panel display

set_panel_display.sh

#!/bin/bash

# Enforce cosmic panel (and dock) to show on a display given by a serial no.
# Wayland and Cosmic Desktop only. Can be used in your bash ~/.profile.
# Use 'cosmic-randr list --kdl' to find the serial no of connected displays.
#
# Usages:
#   ./set_panel_display.sh PRJM6HA014778
#   ./set_panel_display.sh

# parameters -------------------------------------------------------------------

SERIAL="PRJM6HA014850"                       # set a default display serial no.
if [ ! -z "$1" ]; then SERIAL=$1; fi         #           ... from CLI param

# read display config ----------------------------------------------------------

# read and reduce display config to relevant properties
DISP_CFG=$(cosmic-randr list --kdl | grep "output\|serial\|{\|}")
DISP_CFG=$(echo "$DISP_CFG" | tr '\n' ' ' | tr -s ' ' | sed 's/} } /} }\n/g')
DISP_CFG=${DISP_CFG//"output \""/}
DISP_CFG=${DISP_CFG//"\" enabled=#false"/}
DISP_CFG=${DISP_CFG//"\" enabled=#true"/}
DISP_CFG=${DISP_CFG//" modes { }"/}

# filter for serial number
SERIAL_CFG=$(echo "$DISP_CFG" | grep "$SERIAL")
if [ -z "$SERIAL_CFG" ]; then
  echo -e "ERROR: No display found with serial: '$SERIAL'\n"
  echo -e "Available displays:\n$DISP_CFG"
  exit 1;
fi

set -e
DISPLAY=$(echo "$SERIAL_CFG" | sed -r 's/(\S*).*/\1/g')

# write cosmic configs ---------------------------------------------------------

# write to cosmic config files
CONFIG_ROOT="$HOME/.config/cosmic/com.system76.CosmicPanel"
PANEL_CFG="$CONFIG_ROOT.Panel/v1/output"
DOCK_CFG="$CONFIG_ROOT.Dock/v1/output"
CONTENT="Name(\"$DISPLAY\")"
echo $CONTENT | tee $DOCK_CFG $PANEL_CFG >/dev/null;
echo "Serial '$SERIAL' -> $CONTENT set as panel and dock output config"

# restart panel and dock -------------------------------------------------------
# although cosmic-comp checks for config changes it didn't always work. Hence:
if pgrep cosmic-panel > /dev/null; then killall -9 cosmic-panel; fi
# give systemd a chance to restart cosmic-panel before doing it manually
sleep 2
if ! pgrep cosmic-panel > /dev/null; then
  cosmic-panel &
  disown
fi