Add node-type to support sources and sinks

Before this commit, pulseaudio-control supported solely sinks. After
this commit, it supports sinks and sources, under a new name "node".

A new flag `--node-type` changing the behavior of the script to
handle sources instead of sinks.

All the existing mentions of sinks have been changed to node when
appropriate.

Sinks and sources almost share the same commands, with the main
difference being the command name (i.e. sink for Sinks).

Thus, this commit adds a simple and hacky way to handle sources:
a variable SINK_OR_SOURCE holds either `ink` or `ource` so that
commands that were using `Sink` `Sinks` `sinks` `sink` can be
transformed to `Source` `Sources` `sources` `source` easily.

Author: Aerion

README.md

@@ -2,8 +2,8 @@
 
 A feature-full volume control module for PulseAudio. Also known as Pavolume. Main features:
 
-* Increase/Decrease and Mute the default sink's audio.
-* Switch between sinks easily. You can also blacklist useless devices.
+* Increase/Decrease and Mute the default audio node (can be sink or source).
+* Switch between nodes easily. You can also blacklist useless devices.
 * Optionally enable notifications and OSD messages.
 * Works as a shortcut to pavucontrol or your favorite audio manager tool.
 * Highly customizable: check the [Usage](#usage) section for details.
@@ -51,62 +51,74 @@ exec = pulseaudio-control [option...] <action>
 where `action`, and (optionally) `option`s are as specified in `pulseaudio-control help`:
 
 ```
-Usage: pulseaudio-control [OPTION...] ACTION
+Usage: ./pulseaudio-control.bash [OPTION...] ACTION
+
+Terminology: A node represents either a sink (output) or source (input).
 
 Options:
   --autosync | --no-autosync
         Whether to maintain same volume for all programs.
-        Default: no
+        Default: "no"
   --color-muted <rrggbb>
         Color in which to format when muted.
-        Default: 6b6b6b
+        Default: "6b6b6b"
   --notifications | --no-notifications
-        Whether to show notifications when changing sinks.
-        Default: no
+        Whether to show notifications when changing nodes.
+        Default: "no"
   --osd | --no-osd
         Whether to display KDE's OSD message.
-        Default: no
+        Default: "no"
   --icon-muted <icon>
         Icon to use when muted.
         Default: none
-  --icon-sink <icon>
-        Icon to use for sink.
+  --icon-node <icon>
+        Icon to use for node.
         Default: none
   --format <string>
         Use a format string to control the output.
+        Remember to pass this argument wrapped in single quotes (`'`) instead
+        of double quotes (`"`) to avoid your shell from evaluating the
+        variables early.
         Available variables:
         * $VOL_ICON
         * $VOL_LEVEL
-        * $ICON_SINK
-        * $SINK_NICKNAME
+        * $ICON_NODE
+        * $NODE_NICKNAME
         * $IS_MUTED (yes/no)
-        Default: $VOL_ICON ${VOL_LEVEL}%  $ICON_SINK $SINK_NICKNAME
+        Default: '$VOL_ICON ${VOL_LEVEL}%  $ICON_NODE $NODE_NICKNAME'
   --icons-volume <icon>[,<icon>...]
         Icons for volume, from lower to higher.
         Default: none
+  --node-type <node_type>
+        Whether to consider PulseAudio sinks (output) or sources (input).
+        All the operations of pulseaudio-control will apply to one of the two.
+        Pass `input` for the sources, e.g. a microphone
+        Pass `output` for the sinks, e.g. speakers, headphones
+        Default: "output"
   --volume-max <int>
         Maximum volume to which to allow increasing.
-        Default: 130
+        Default: "130"
   --volume-step <int>
         Step size when inc/decrementing volume.
-        Default: 2
-  --sink-blacklist <name>[,<name>...]
-        Sinks to ignore when switching. You can use globs. Don't forget to
+        Default: "2"
+  --node-blacklist <name>[,<name>...]
+        Nodes to ignore when switching. You can use globs. Don't forget to
         quote the string when using globs, to avoid unwanted shell glob
         extension.
         Default: none
-  --sink-nicknames-from <prop>
-        pactl property to use for sink names, unless overriden by
-        --sink-nickname. Its possible values are listed under the 'Properties'
-        key in the output of `pactl list sinks`
+  --node-nicknames-from <prop>
+        pactl property to use for node names, unless overriden by
+        --node-nickname. Its possible values are listed under the 'Properties'
+        key in the output of `pactl list sinks` and `pactl list sources`
         Default: none
-  --sink-nickname <name>:<nick>
-        Nickname to assign to given sink name, taking priority over
-        --sink-nicknames-from. May be given multiple times, and 'name' is
-        exactly as listed in the output of `pactl list sinks short | cut -f2`.
-        Note that you can also specify a port name for the sink with
+  --node-nickname <name>:<nick>
+        Nickname to assign to given node name, taking priority over
+        --node-nicknames-from. May be given multiple times, and 'name' is
+        exactly as listed in the output of `pactl list sinks short | cut -f2`
+        and `pactl list sources short | cut -f2`.
+        Note that you can also specify a port name for the node with
         `<name>/<port>`.
-        It is also possible to use glob matching to match sink and port names.
+        It is also possible to use glob matching to match node and port names.
         Exact matches are prioritized. Don't forget to quote the string when
         using globs, to avoid unwanted shell glob extension.
         Default: none
@@ -116,12 +128,17 @@ Actions:
   output            print the PulseAudio status once
   listen            listen for changes in PulseAudio to automatically update
                     this script's output
-  up, down          increase or decrease the default sink's volume
-  mute, unmute      mute or unmute the default sink's audio
+  up, down          increase or decrease the default node's volume
+  mute, unmute      mute or unmute the default node's audio
   togmute           switch between muted and unmuted
-  next-sink         switch to the next available sink
+  next-node         switch to the next available node
   sync              synchronize all the output streams volume to be the same as
-                    the current sink's volume
+                    the current node's volume
+
+Author:
+    Mario Ortiz Manero
+More info on GitHub:
+    https://github.com/marioortizmanero/polybar-pulseaudio-control
 ```
 
 See the [Module](#module) section for an example, or the [Useful icons](#useful-icons) section for some packs of icons.
@@ -137,7 +154,7 @@ The example from the screenshot can:
 * Open `pavucontrol` on right click
 
 ```ini
-[module/pulseaudio-control]
+[module/pulseaudio-control-output]
 type = custom/script
 tail = true
 format-underline = ${colors.cyan}
@@ -147,25 +164,39 @@ label-foreground = ${colors.foreground}
 # Icons mixed from Font Awesome 5 and Material Icons
 # You can copy-paste your options for each possible action, which is more
 # trouble-free but repetitive, or apply only the relevant ones (for example
-# --sink-blacklist is only needed for next-sink).
-exec = pulseaudio-control --icons-volume " , " --icon-muted " " --sink-nicknames-from "device.description" --sink-nickname "alsa_output.pci-0000_00_1b.0.analog-stereo:  Speakers" --sink-nickname "alsa_output.usb-Kingston_HyperX_Virtual_Surround_Sound_00000000-00.analog-stereo:  Headphones" listen
+# --node-blacklist is only needed for next-node).
+exec = pulseaudio-control --icons-volume " , " --icon-muted " " --node-nicknames-from "device.description" --node-nickname "alsa_output.pci-0000_00_1b.0.analog-stereo:  Speakers" --node-nickname "alsa_output.usb-Kingston_HyperX_Virtual_Surround_Sound_00000000-00.analog-stereo:  Headphones" listen
 click-right = exec pavucontrol &
 click-left = pulseaudio-control togmute
-click-middle = pulseaudio-control --sink-blacklist "alsa_output.pci-0000_01_00.1.hdmi-stereo-extra2" next-sink
+click-middle = pulseaudio-control --node-blacklist "alsa_output.pci-0000_01_00.1.hdmi-stereo-extra2" next-node
 scroll-up = pulseaudio-control --volume-max 130 up
 scroll-down = pulseaudio-control --volume-max 130 down
+
+[module/pulseaudio-control-input]
+type = custom/script
+tail = true
+format-underline = ${colors.cyan}
+label-padding = 2
+label-foreground = ${colors.foreground}
+
+exec = pulseaudio-control  --node-type input --icons-volume "" --icon-muted "" --node-nickname "alsa_output.pci-0000_0c_00.3.analog-stereo:  Webcam" --node-nickname "alsa_output.usb-Kingston_HyperX_Virtual_Surround_Sound_00000000-00.analog-stereo:  Headphones" listen
+click-right = exec pavucontrol &
+click-left = pulseaudio-control --node-type input togmute
+click-middle = pulseaudio-control --node-type input next-node
+scroll-up = pulseaudio-control --node-type input --volume-max 130 up
+scroll-down = pulseaudio-control --node-type input --volume-max 130 down
 ```
 
 ## Useful icons
 
 Here's a list with some icons from different fonts you can copy-paste. Most have an space afterwards so that the module has a bit of spacing. They may appear bugged on your browser if the font isn't available there. Please add yours if they aren't in the list.
 
-| Font name                                       | Volumes         | Muted   | Sink icons                 |
-| ----------------------------------------------- | :-------------: | :-----: | :------------------------: |
-| [FontAwesome](https://fontawesome.com)          | `" , "`       | `" "`  | `" "` or `" "`           |
-| [Material](https://material.io/resources/icons) | `" , , "`    | `" "`  | `" "` or `" "` or `" "` |
-| Emoji                                           | `"🔈 ,🔉 ,🔊 "` | `"🔇 "` | `"🔈 "` or `"🎧 "`         |
-| Emoji v2                                        | `"🕨 ,🕩 ,🕪 "`    | `"🔇 "` | `"🕨 "` or `"🎧 "`          |
+| Font name                                       | Volumes         | Muted            | Output icons               | Input icons   |
+| ----------------------------------------------- | :-------------: | :--------------: | :------------------------: | :-----------: |
+| [FontAwesome](https://fontawesome.com)          | `" , "`       | `" "` or `" "`  | `" "` or `" "`           | `", "`      |
+| [Material](https://material.io/resources/icons) | `" , , "`    | `" "` or `"󰍭 "` | `" "` or `" "` or `" "` | `"󰍬, 󰍮"`      |
+| Emoji                                           | `"🔈 ,🔉 ,🔊 "` | `"🔇 "`          | `"🔈 "` or `"🎧 "`         | `"🎙️ "`        |
+| Emoji v2                                        | `"🕨 ,🕩 ,🕪 "`    | `"🔇 "`          | `"🕨 "` or `"🎧 "`          | `"🎤 "`       |
 
 Most of these can be used after downloading a [Nerd Font](https://www.nerdfonts.com/) and including it in your [Polybar config](https://github.com/polybar/polybar/wiki/Fonts). For example: