polybar_alsa_module

#!/usr/bin/env bash

# =================================================================== #
# DESCRIPTION:
# =================================================================== #
# This script is a polybar module.

# It allows the user to toggle between headphones and speakers
# without plugging/unplugging headphones. You can leave your
# headphones plugged in switch between the two ports by clicking
# on the icon for the module on your polybar.

# =================================================================== #
# CONFIGURATION
# =================================================================== #
# 4. Set `headphones` & `speakers` variable in script to the name
#    of your headphone and speaker ports.
#    The following will list all ports for your current sink, assuming
#    only one sink is available:
#
#    $(pacmd list | grep analog-output | awk '($1 !~ /active/) && (!x[$0]++) && gsub(":","") {print $1}')
#
# example:
#
#  > $(pacmd list | grep analog-output | awk '($1 !~ /active/) && (!x[$0]++) && gsub(":","") {print $1}')
#    analog-output-lineout
#    analog-output-headphones
#
# You would set the folowing in this script:
# headphones="analog-output-headphones"
# speakers="analog-output-lineout"


# Although it's not completely relevant, if you'd like to see what your
# default port is:
# pacmd stat | awk -F": " '/^Default sink name: /{print $2}' | awk -F"." '{print $NF}'

# =================================================================== #
# USAGE
# =================================================================== #
# To use this script, include the following custom module definition
# to your polybar config file (replace values in brackets with your own):

# [module/{YOUR_MODULE_NAME}]
# type = custom/script
# exec = {PATH_TO_THIS_SCRIPT}/polybar_alsa_module
# tail = true
# interval = 0
# click-left = zsh -c "kill -SIGUSR1 %pid%"
# format-background = {COLOR_FOR_BACKGROUND_HEX}
# format-foreground = {COLOR_FOR_ICON_HEX}

# include the module in your bar section:
# example: placing 'alsa-switcher' module on the left side of a
# bar named 'main'

# [bar/main]
# ...
# modules-left = alsa-switcher
# ...

# More information on Polybar 'script' modules can be found here:
# https://github.com/jaagr/polybar/wiki/Module:-script

# =================================================================== #
# KNOWN BUGS:
# =================================================================== #

# 1:
# TLDR: Do not plug in your speakers into line out. Choose rear
# center speaker or something else.

# On one of my desktops the rear 'line out' jack and the front
# 'headphone' jack share the 'Front' alsa 'Simple Control'.
# This wouldn't be a problem except for...
# When you set the sink port using pacmd to either headphones or
# lineout, it will keep the Front port at 100% volume. You can
# confirm this using alsamixer. It will contiue to output audio
# through the speakers even when this script sets headphones as
# output.

headphones="analog-output-headphones"
speakers="analog-output-lineout"

listen() {
    while true; do
        muted=$(volume status | awk '/^muted/ {print $2}')
        [[ $(dot sound port) == $speakers ]] && icon="" || icon=""
        [[ $(volume status | awk '/^muted/ {print $2}') == true ]] && colors="%{ F#$mute_fg B#$mute_bg }" || colors="%{ F#$fg B#$bg }"
        # the expra space on the left acts as a pad-left: 1
        echo "$padleft$colors $icon"
        sleep 0.5 &
        wait
    done
}

switch() {
    sink_id=$(pacmd list | grep '*' | awk 'NR==1{print $3}')
    current_port=$(dot sound port)
    if [[ $current_port == $speakers ]]; then
        vol=$(volume get)
        pacmd set-sink-port $sink_id $headphones > /dev/null 2>&1
        dot sound port $headphones
        volume set $vol
        amixer sset Front 0 1&2>/dev/null
        # set front channel to 0 volume, because muting it mutes headphones as well...
        # annoying bug with alsa..
    elif [[ $current_port == $headphones ]]; then
        vol=$(volume get)
        pacmd set-sink-port $sink_id $speakers > /dev/null 2>&1
        dot sound port $speakers
        volume set $vol
    else
       echo 'ERROR: $current_port is '$current_port" expected either $headphones or $speakers"
       exit 1
    fi

    exit 0
}

while test $# -gt 0; do
	  case "$1" in
        --switch)
            switch;;
        --mutefg)
            mute_fg=$2
            shift;;
        --mutebg)
            mute_bg=$2
            shift;;
        --bg)
            bg=$2
            shift;;
        --fg)
            fg=$2
            shift;;
        --padleft)
            padleft=$2
            shift;;
        \?)
            echo "Invalid option: -$OPTARG" >&2
            exit 1;;
        *)
            break;;
    esac
    shift
done
if [[ -z $padleft ]]; then
    padleft=""
fi

listen