dotfiles/.config/polybar/scripts/task_manager

#!/usr/bin/env bash

STATUS_FILE=/dev/shm/polybar_task_manager
REFRESH=2
MAX_TASKS=10

get_icon_by_name()
{
    name=$(echo "$1" | tr '[:upper:]' '[:lower:]')
    declare -A ICON_MAP=(
        [firefox]=
        [code]=
        [tilix]=
        [nautilus]=
        [gnome-calculator]=
        [gnome-calendar]=
    )

    if [ ${ICON_MAP[$name]+_} ]; then
        echo "${ICON_MAP[$name]}"
    fi
}

show_tasks()
{
    wmctrl -lx | awk '{if ($2 > -1) print $3,$1}' \
               | awk -F'.' '{ print $NF }' \
               | tail -$MAX_TASKS | sort > $STATUS_FILE.current

    diff -q $STATUS_FILE $STATUS_FILE.current > /dev/null 2>&1
    if [ $? -ne 1 ]; then
        rm -rf $STATUS_FILE.current
        return 0
    fi

    mv $STATUS_FILE.current $STATUS_FILE

    counter=1
    num_windows=$(wc -l $STATUS_FILE | cut -f 1 -d " ")
    while [ $counter -le "$MAX_TASKS" ]; do
        if [ $counter -le "$num_windows" ]; then
            polybar-msg hook taskbar$counter 2 > /dev/null
        else
            polybar-msg hook taskbar"$counter" 1 > /dev/null
        fi

        sleep 0.1
        counter=$((counter+1))
    done
}

print_task_name()
{
    name=$(sed "${1}q;d" $STATUS_FILE | cut -f 1 -d " ")
    icon=$(get_icon_by_name "$name")

    if [ -n "$icon" ]; then
        name="$name "
    fi

    printf "%s%s" "$name" "$icon"
}

get_task_id()
{
    sed "${1}q;d" $STATUS_FILE | cut -f 2 -d " "
}

daemon()
{
    while true; do
        show_tasks
        sleep $REFRESH
    done
}

case "$1" in
    --daemon)
        > /dev/shm/polybar_task_manager
        daemon
    ;;
    --set-task)
        print_task_name "$2"
    ;;
    --show-window)
        id=$(get_task_id "$2")
        wmctrl -ia "$id"
        print_task_name "$2"
    ;;
    --close-window)
        id=$(get_task_id "$2")
        wmctrl -ic "$id"
    ;;
esac

exit 0