activate-window

#!/bin/bash

# Attempt to activate a window whose title has the given prefix.
#
# This function works best when using Gnome Shell, with the extension
# https://extensions.gnome.org/extension/5021/activate-window-by-title/
# (Activate Window By Title) installed.
#
# If the extension is not available, we try two fallbacks:
# * using org.gnome.Shell.Eval (requires unsafe mode since Gnome 41)
# * using xdotool (only works in X sessions; prefix is case-insensitive)
# Please note that neither fallback has been tested very well.

function activate-window {
    activate-window-gnome-shell-extension "$1" || activate-window-gnome-shell "$1" || activate-window-xdotool "$1"
}

function activate-window-gnome-shell-extension {
    busctl --user call \
           org.gnome.Shell \
           /de/lucaswerkmeister/ActivateWindowByTitle \
           de.lucaswerkmeister.ActivateWindowByTitle \
           activateByPrefix \
           s "$1" \
        | (
        IFS=' ' read -r b found
        [[ $b == b ]] || { printf >&2 'dbus call de.lucaswerkmeister.ActivateWindowByTitle: expected return type b but was %q\n' "$b"; exit 1; }
        [[ $found == true ]] || exit 1
    )
}

function activate-window-gnome-shell {
    local string="${1//'\'/'\\'}"
    local string='"'"${string//'"'/'\"'}"'"'
    busctl --user call org.gnome.Shell /org/gnome/Shell org.gnome.Shell Eval s '
        (function() {
            for ( const actor of global.get_window_actors() ) {
                const window = actor.get_meta_window(),
                      title = window.get_title();
                if ( title.startsWith( '"$string"' ) ) {
                    window.activate( global.get_current_time() );
                    return true;
                }
            }
            return false;
        })();
    ' | (
        IFS=' ' read -r bs success result
        [[ $bs == bs ]] || { printf >&2 'dbus call org.gnome.Shell.Eval: expected return type bs but was %q\n' "$bs"; exit 1; }
        [[ $success == true ]] || { printf >&2 'dbus call org.gnome.Shell.Eval: expected success=true but was %q\nResult: %s\n' "$success" "$result"; exit 1; }
        [[ $result == '"true"' ]] || exit 1
    )
}

function activate-window-xdotool {
    local pattern="${1//'\'/'\\'}"
    pattern="${pattern//'.'/'\.'}"
    pattern="${pattern//'['/'\['}"
    pattern="${pattern//'('/'\('}"
    pattern="${pattern//'^'/'\^'}"
    pattern="${pattern//'$'/'\$'}"
    pattern="${pattern//'*'/'\*'}"
    pattern="${pattern//'+'/'\+'}"
    pattern="${pattern//'?'/'\?'}"
    pattern="${pattern//'{'/'\{'}"
    pattern="${pattern//'|'/'\|'}"
    xdotool search --name "^$pattern" windowactivate &>/dev/null
}