focusme

#!/bin/bash

###Functionality:

###It works by querying the open window names/classes for a string, then:

#- If found it activates/focuses it.
#- If not found it will launch the specified command.
#- If the window is found and it's active it will launch a new one.

#needs xdotool
#apt install xdotool or apk add xdotool

#___

#Launch command in the background and exit
#launch <command>
function launch () {
    if [[ ! $1 ]]
    then
	exit
    fi
    
    $1 &>/dev/null &
    exit
}

#Search window by given string in name, class etc. and return the resulting window ids or the first|last one
#searchwindow <windowname> <type> [first|last] 
function searchwindow () {
#    local cmd="xdotool search --onlyvisible $1 2>/dev/null"

    if [[ ! $1 || ! $2 ]]
    then
	echo >&2 "searchwindow usage: searchwindow <windowname> <type> [first|last]";
	exit 1
    fi


    case $3 in
	'first')
	    local out=`xdotool search --onlyvisible --$2 $1 2>/dev/null | grep -m1 '[0-9]\+'`
	;;
	'last')
	    local out=`xdotool search --onlyvisible --$2 $1 2>/dev/null | tail -1`
	;;
	*)
	    local out=`xdotool search --onlyvisible --$2 $1 2>/dev/null`
	;;
    esac

    #Note: Must double quote the echoed variable in order to preserve multiple lines, 
    #since echo just prints a space delimited list of lines in a single line
    echo "$out"
}

function checkdeps () {
    command -v xdotool &>/dev/null || { echo >&2 "Xdotool required! Aborting."; exit 1; }
}

function checkparams () {
if [ $1 -eq 0 ]
then
    echo "FocusME activates the given window by name, launch one if none found or the active window matches"
    echo "More info: https://github.com/dixflat/FocusME"
    echo ""
    echo "Usage: focusme <windowname> [command]"
    exit
fi
}

###
##
#

checkparams $#
checkdeps

WINDOWID=`searchwindow $1 class first`
WINDOWID_ACTIVE=`xdotool getactivewindow`
WINDOWACTIVENAME=`xdotool getwindowname $WINDOWID_ACTIVE`
WINDOWACTIVECLASS=`xprop -id $WINDOWID_ACTIVE WM_CLASS`

NAME=$1
COMMAND=$2

#No matching window found, launching one
if [[ ! $WINDOWID ]]
then
    launch "$COMMAND"
    exit
fi

shopt -s nocasematch
#Active window matches NAME or its ID, so launch a new one
if [[ $WINDOWACTIVECLASS =~ "$NAME" || $WINDOWID_ACTIVE == $WINDOWID ]]
then
    launch "$COMMAND"
else
    #highlight a matching window
    xdotool windowactivate $(searchwindow $1 class last)
fi
shopt -u nocasematch

#___