[vega] Sets up working system. [Eww] Moves config to be specific to drew-desktop

system/hosts/drew-desktop/eww/config/scripts/audio-toolkit.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+set -e
+
+SOURCE='@DEFAULT_AUDIO_SOURCE@'
+SINK='@DEFAULT_AUDIO_SINK@'
+
+case $1 in
+  source)
+    device=$SOURCE
+    ;;
+  sink)
+    device=$SINK
+    ;;
+  *)
+    echo "Invalid device: $1"
+    echo "Valid options are 'source' and 'sink'"
+    exit 1
+    ;;
+esac
+
+print_device_info() {
+  # The node description seems to be the most useful value here, though different values are available.
+  # However, we'll strip the "Analog Stereo" part.
+  description=$(wpctl inspect "$device" | sed -n -e 's/.*node.description = "\(.*\) Analog Stereo"/\1/p')
+
+  # The output of a muted device is something like "Volume: 0.55", so we just nab the second field.
+  volume=$(wpctl get-volume "$device" | awk '/Volume/ { print $2 }')
+
+  # The output of a muted device is something like "Volume: 0.55 [MUTED]", so "true" if the third field is present, "false" otherwise.
+  muted=$(wpctl get-volume "$device" | awk '/Volume/ { print ($3 ? "true" : "false") }')
+
+  echo "{ \"description\": \"$description\", \"volume\": $volume, \"muted\": $muted }"
+}
+
+print_device_info
+
+pactl --format=json subscribe | grep --line-buffered $1 | while read -r event; do print_device_info; done