Arrange workspace on multiple monitors (Hyprland)

monitors.sh

#!/usr/bin/env bash
# IMPORTANT: this script is now part of my dotfiles and maintained there
# see https://github.com/Diaoul/dotfiles/blob/main/.config/hypr/scripts/workspaces.sh
set -e

declare -i last_called=0
declare -i throttle_by=4

@throttle() {
  local -i now=$(date +%s)
  if (($now - $last_called > $throttle_by))
  then
    # delay execution
    sleep $throttle_by
    # execute
    "$@"
  fi
  last_called=$(date +%s)
}

function arrange_workspaces() {
    # Maintain 10 workspaces across multiple monitors
    # This script assumes that the monitors are in horizontal layout and already
    # correctly setup
    monitors_json=$(hyprctl monitors -j)
    workspaces_json=$(hyprctl workspaces -j)

    monitors=($(echo $monitors_json | jq -r '. | sort_by(.x) | .[].name'))
    workspace_count=$(echo $workspaces_json | jq -r '. | length')
    active_workspaces=($(echo $monitors_json | jq -r '. | sort_by(.x) | .[].activeWorkspace.id'))

    echo "Detected ${#monitors[@]} monitors with $workspace_count workspaces and $(IFS=,; echo ${active_workspaces[*]}) active"

    # create or fix workspaces
    # this requires support for persistent workspaces
    # see https://github.com/hyprwm/Hyprland/pull/3346
    for ((i = 1; i <= 10; i++)); do
        workspace=$(echo $workspaces_json | jq -r ".[] | select(.id == $i)")
        if [ -z "$workspace" ]; then
            echo "Workspaces $i does not exist, creating it"
            hyprctl dispatch workspace $i > /dev/null
            hyprctl dispatch workspaceopt persistent > /dev/null
        else
            persistent=$(echo $workspace | jq -r ".persistent")
            if [ "$persistent" = false ]; then
                echo "Workspaces $i is not persistent, persisting it"
                hyprctl dispatch workspace $i > /dev/null
                hyprctl dispatch workspaceopt persistent > /dev/null
            fi
        fi
    done

    # assign and move workspaces
    if [[ "${#monitors[@]}" == 1 ]]; then
        for ((i = 10; i >= 1; i--)); do
            echo "Moving workspace $i to ${monitors[0]}"
            hyprctl keyword workspace "$i, monitor:${monitors[0]}" > /dev/null
            hyprctl dispatch moveworkspacetomonitor $i ${monitors[0]} > /dev/null
        done
    elif [[ "${#monitors[@]}" == 2 ]]; then
        for ((i = 10; i >= 6; i--)); do
            echo "Moving workspace $i to ${monitors[1]}"
            hyprctl keyword workspace "$i, monitor:${monitors[1]}" > /dev/null
            hyprctl dispatch moveworkspacetomonitor $i ${monitors[1]} > /dev/null
        done
        hyprctl dispatch workspace 6 > /dev/null
        for ((i = 5; i >= 1; i--)); do
            echo "Moving workspace $i to ${monitors[0]}"
            hyprctl keyword workspace "$i, monitor:${monitors[0]}" > /dev/null
            hyprctl dispatch moveworkspacetomonitor $i ${monitors[0]} > /dev/null
        done
    elif [[ "${#monitors[@]}" == 3 ]]; then
        for ((i = 10; i >= 8; i--)); do
            echo "Moving workspace $i to ${monitors[2]}"
            hyprctl keyword workspace "$i, monitor:${monitors[2]}" > /dev/null
            hyprctl dispatch moveworkspacetomonitor $i ${monitors[2]} > /dev/null
        done
        for ((i = 7; i >= 4; i--)); do
            echo "Moving workspace $i to ${monitors[1]}"
            hyprctl keyword workspace "$i, monitor:${monitors[1]}" > /dev/null
            hyprctl dispatch moveworkspacetomonitor $i ${monitors[1]} > /dev/null
        done
        for ((i = 3; i >= 1; i--)); do
            echo "Moving workspace $i to ${monitors[0]}"
            hyprctl keyword workspace "$i, monitor:${monitors[0]}" > /dev/null
            hyprctl dispatch moveworkspacetomonitor $i ${monitors[0]} > /dev/null
        done
    else  # more than 3 monitors...
        echo "Too many monitors"
    fi
    for id in "${active_workspaces[@]}"; do
        echo "Activating workspace $id"
        hyprctl dispatch workspace $id > /dev/null
    done
}

function configure_monitors() {
    # rely an kanshi for profile detection and output configuration
    # see https://todo.sr.ht/~emersion/kanshi/54#event-235509
    echo "Configuring monitors..."
    kanshi > /dev/null 2>&1 &
    sleep 1
    killall kanshi

    # arrange workspaces to match the new configuration
    echo "Configuring workspaces..."
    arrange_workspaces
}

function handle {
    if [[ ${1:0:12} == "monitoradded" ]]; then
        echo "Event detected: monitor added"
        @throttle configure_monitors
    elif [[ ${1:0:14} == "monitorremoved" ]]; then
        echo "Event detected: monitor removed"
        @throttle configure_monitors
    fi
}

cli_help() {
  cli_name=${0##*/}
  echo "
$cli_name
Hyprland monitors control
Usage: $cli_name [command]
Commands:
  configure_monitors    Configure monitors using kanshi
  arrange_workspaces    Arrange workspaces on monitors
  listen    Listen for hypr monitor events and arrange workspaces automatically
  *         Help
"
  exit 1
}


case "$1" in
    configure_monitors)
        configure_monitors
        ;;
    arrange_workspaces)
        arrange_workspaces
        ;;
    listen)
        echo "Listening to monitor events..."
        socat - UNIX-CONNECT:/tmp/hypr/$(echo $HYPRLAND_INSTANCE_SIGNATURE)/.socket2.sock | while read line; do handle $line; done
        ;;
    *)
        cli_help
        ;;
esac

I now maintain this script in my dotfiles along with the associated hyrpland configuration.