Presentation mode button for Waybar+Sway+Swayidle

# Waybar "Presentation mode" custom button

~/.config
├── sway
│   ├── config
│   ├── presentation_mode.sh
│   ├── swayidle.sh
│   └── swayidle_status
└── waybar
    └── config.jsonc
/tmp
└── presentation_mode_pipe  

config (sway)

set  $CONFIG ~/.config/sway
exec $CONFIG/swayidle.sh

config.jsonc (waybar)

{
    "modules-center" : [ "custom/presentation_mode" ],
    "custom/presentation_mode" :
    {
        "exec"          : "~/.config/sway/presentation_mode.sh",
        "on-click"      : "~/.config/sway/presentation_mode.sh --toggle",
        "return-type"   : "json",
        "exec-on-event" : true,
        "tooltip"       : true,
    },
}

presentation_mode.sh

#! /usr/bin/bash

read -r -d '' ON <<- EOM
{
	"text": "⚪",
	"alt": "on",
	"tooltip": "Swayidle is off",
	"class": ["on"]
}
EOM

read -r -d '' OFF <<- EOM
{
	"text": "⚫",
	"alt": "off",
	"tooltip": "Swayidle is on",
	"class": ["off"]
}
EOM

SRC_DIR=`dirname "$(readlink -f "${BASH_SOURCE[0]}")"`
SIDLE_STS="$SRC_DIR/swayidle_status"
PMODE_PIPE='/tmp/presentation_mode_pipe'

toggle_state() {
    if [[ $1 == '1' ]]; then
        pkill swayidle
        echo 0 > "$SIDLE_STS"
        echo 1 > $PMODE_PIPE
    else
        swayidle -w -S seat0 &>/dev/null & disown
        echo 1 > "$SIDLE_STS"
        echo 0 > $PMODE_PIPE
    fi
}

send_msg() {
    [[ $1 == '1' ]] && MSG="$ON" || MSG="$OFF"
    stdbuf -oL -eL       \
        echo "$MSG" |    \
        jq --unbuffered  \
        --compact-output \
        --monochrome-output
}

if [[ $1 == '--toggle' ]]; then
    toggle_state `cat "$SIDLE_STS"`
else
    send_msg $((`cat "$SIDLE_STS"` ^ 1))
    rm  -f $PMODE_PIPE
    mkfifo $PMODE_PIPE
    while true; do
        send_msg `cat $PMODE_PIPE`
    done
fi

swayidle.sh

#! /usr/bin/bash

SRC_DIR=`dirname "$(readlink -f "${BASH_SOURCE[0]}")"`
ENABLED=`cat "$SRC_DIR/swayidle_status"`

if [[ $ENABLED == '1' ]]; then
    swayidle -w -S seat0
fi

swayidle_status

1