monitor-info

#!/bin/env bash

# provide help dialogue when passed "-h" or "--help"
if [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
    echo -e "\033[1;34mmonitor-info\033[0;0m is a shell script that outputs the name,\nresolution, and refresh rate of all connected monitors.\nTakes no arguments save for -h (or --help),\nwhich outputs this message."
    exit 0
fi

# ensure xrandr is available
if ! $(command -v xrandr > /dev/null); then
    echo "this script requires the utility xrandr to function."
    exit 1
fi

#
# iterate through connected displays as reported by xrandr,
# reporting information on their refresh rate, resolution,
# and status as "primary".
#

# set field seperator to newline
IFS=$'\n'
# iterate through every connected monitor
for monitor in $( xrandr | grep '\bconnected' ); do
	# get monitor name from xrandr
	monitor_name="$(echo $monitor | sed -r 's/\s*([^ ]+).*/\1/')"
	# determine whether or not the monitor is considered the primary monitor
	[ ! -z "$(echo $monitor | grep primary)" ] && monitor_primary="true" || monitor_primary="false"
	# get monitor resolution
	monitor_resolution="$(echo $monitor | sed 's/.*\( [0-9]*x[0-9]*+\).*/\1/;s/ //;s/+//')"
	# get monitor refresh rate
	monitor_refresh_rate="$(xrandr | head -n $(( $(xrandr | grep -n -e '*' -e '\bconnected' | grep $monitor_name | cut -d ':' -f1) + 1 )) | tail -n 1 | sed 's/ \+/\n/g' | grep '\*' | sed 's/\*//;s/+//')"

    # set up colors for output
	blue='\033[1;34m'
	green='\033[1;32m'
	red='\033[1;31m'
	reset='\033[0;0m'
	[ "$monitor_primary" == "true" ] || primary_bool_color="$red"

	# print it in a human-legible fashion
	echo -e "${blue}$monitor_name:"
	echo -e "\t${blue}primary: ${green}${primary_bool_color}$monitor_primary"
	echo -e "\t${blue}resolution: ${green}$monitor_resolution"
	echo -e "\t${blue}refresh rate: ${green}$monitor_refresh_rate${reset}"
done