[Linux] Add pahelper.sh command

This was copied directly from
https://raw.githubusercontent.com/mpapis/home_dotfiles/master/bin/mypa

dotfiles/lib/bin/pahelper.sh

@@ -0,0 +1,98 @@
+#!/usr/bin/env bash
+
+# Taken from https://raw.githubusercontent.com/mpapis/home_dotfiles/master/bin/mypa
+
+function list_sinks()
+{
+  pacmd list-sinks | grep -E 'index:|name:'
+}
+
+function switch_sink_default()
+{
+  echo switching default
+  pacmd set-default-sink $1 || echo failed
+}
+
+function switch_sink_applications()
+{
+  echo switching applications
+  pacmd list-sink-inputs |
+    awk '/index:/{print $2}' |
+    xargs -r -I{} pacmd move-sink-input {} $1 ||
+      echo failed
+}
+
+function switch_sink_kmix_master()
+{
+  qdbus org.kde.kmix >/dev/null 2>&1 || return 0 # kmix not found
+
+  typeset name mixer
+  # get the device name in pulseaudio
+  name="$(
+    pacmd list-sinks | awk -v search=$1 '
+      /index:/{found=$2}
+      /* index:/{found=$3}
+      /name:/&&found==search{print $2}
+    '
+  )"
+  # format device name to a name in kmix
+  name="${name#<}"
+  name="${name%>}"
+  name="${name//[.-]/_}"
+  # grab full path in kmix dbus
+  mixer="$( qdbus org.kde.kmix | \grep "/${name}$" )"
+  mixer="${mixer#/Mixers/}"
+  mixer="${mixer%/*}"
+  # get the kmix ids
+  name="$( qdbus org.kde.kmix "/Mixers/${mixer}/${name}" org.kde.KMix.Control.id)"
+  mixer="$(qdbus org.kde.kmix "/Mixers/${mixer}"         org.kde.KMix.Mixer.id  )"
+  echo "set master channel in kmix"
+  qdbus org.kde.kmix /Mixers org.kde.KMix.MixSet.setCurrentMaster "$mixer" "$name" >/dev/null || echo failed
+}
+
+function switch_sink()
+{
+  switch_sink_default      "$@"
+  switch_sink_applications "$@"
+  switch_sink_kmix_master  "$@"
+}
+
+# Use a zenity gui to switch audio outputs
+function switch_gui()
+{
+# get current output id, all output ids and the sink names
+   current_id=$(pacmd list-sinks | egrep '\* index:' | egrep -o '[0-9]+$')
+   ids=( $(pacmd list-sinks | egrep 'index:' | egrep -o '[0-9]+$' | tr '\n' ' ') )
+   names=( $(pacmd list-sinks | egrep 'name:' | egrep -o '\..*>$' | tr -d '>' | tr '\n' ' ') )
+
+   zen_pars="--list --radiolist --column '' --column 'ID' --column 'Sink_name'"
+
+# construct the zenity command
+   for i in "${!ids[@]}"
+   do
+      if [ ${ids[$i]} = $current_id ]; then
+         zen_pars="$zen_pars TRUE"
+      else
+         zen_pars="$zen_pars FALSE"
+      fi
+      zen_pars="$zen_pars ${ids[$i]} ${names[$i]}"
+   done
+
+# change the audio sink with the switch_sink function
+   new_sink_id=$(zenity $zen_pars || echo "")
+   if [ -n $new_sink_id ]; then
+      switch_sink $new_sink_id
+   fi
+}
+
+function help_me()
+{
+  echo "Usage: $0 [gui|list|<sink name to switch to>]"
+}
+
+case "${1:-}" in
+  (""|list) list_sinks       ;;
+  ([0-9]*)  switch_sink "$@" ;;
+  (gui)     switch_gui       ;;
+  (*)       help_me          ;;
+esac