graphical: set volume settings via window manager

sound.mediaKeys doesn't work with pulseaudio enabled, but some programs
e.g. Firefox require it.

profiles/graphical/default.nix

@@ -5,7 +5,7 @@ in {
 
   hardware.opengl.enable = true;
   hardware.opengl.driSupport = true;
-  hardware.pulseaudio.enable = false;
+  hardware.pulseaudio.enable = true;
 
   environment = {
     etc = {
@@ -37,6 +37,7 @@ in {
     };
 
     systemPackages = with pkgs; [
+      pulsemixer
       adapta-gtk-theme
       cursor
       dzen2

profiles/graphical/sway/config

@@ -96,9 +96,9 @@ for_window [app_id=".*"] inhibit_idle fullscreen
     bindsym $mod+f fullscreen
 
     # display volume level when pushed
-    bindsym XF86AudioRaiseVolume exec $volume
-    bindsym XF86AudioLowerVolume exec $volume
-    bindsym XF86AudioMute exec $volume
+    bindsym XF86AudioRaiseVolume exec $volume; $mixer 2%+ unmute
+    bindsym XF86AudioLowerVolume exec $volume; $mixer 2%- unmute
+    bindsym XF86AudioMute exec $volume; $mixer toggle
 
     # Drag floating windows by holding down $mod and left mouse button.
     # Resize them with right mouse button + $mod.

profiles/graphical/sway/default.nix

@@ -40,6 +40,7 @@ in {
       let volnoti = import ../misc/volnoti.nix { inherit pkgs; };
       in ''
         set $volume ${volnoti}
+        set $mixer "${pkgs.alsaUtils}/bin/amixer -q set Master"
 
         # set background
         output * bg ${pkgs.adapta-backgrounds}/share/backgrounds/adapta/tri-fadeno.jpg fill

profiles/graphical/xmonad/_xmonad.nix

@@ -1,4 +1,6 @@
-{ autostart, screenshots, touchtoggle, pkgs, stoggle, volnoti }: ''
+{ autostart, screenshots, touchtoggle, pkgs, stoggle, volnoti }:
+let inherit (pkgs) alsaUtils;
+in ''
   -- Function for fullscreen toggle
   fullToggle :: X ()
   fullToggle = do
@@ -6,6 +8,11 @@
     sendMessage $ Toggle NBFULL
     sendMessage $ SetStruts [] [minBound .. maxBound]
 
+  setVolume :: String -> X ()
+  setVolume options = do
+    spawn ("${alsaUtils}/bin/amixer -q set Master " ++ options)
+    spawn "${volnoti}"
+
   myAutostart :: X ()
   myAutostart = do
     spawn "${autostart}"
@@ -41,15 +48,15 @@
       )
     -- lower volume
     , ( ( 0                                     , xF86XK_AudioLowerVolume )
-      , spawn "${volnoti}"
+      , setVolume "2%- unmute"
       )
     -- raise volume
     , ( ( 0                                     , xF86XK_AudioRaiseVolume )
-      , spawn "${volnoti}"
+      , setVolume "2%+ unmute"
       )
     -- mute volume
     , ( ( 0                                     , xF86XK_AudioMute        )
-      , spawn "${volnoti}"
+      , setVolume "toggle"
       )
     -- start qutebrowser
     , ( ( myModKey                              , xK_b                    )

profiles/laptop/default.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }: {
+{ config, pkgs, lib, ... }: {
   environment.systemPackages = with pkgs; [
     acpi
     lm_sensors
@@ -27,7 +27,7 @@
     ];
   };
 
-  sound.mediaKeys = {
+  sound.mediaKeys = lib.mkIf (!config.hardware.pulseaudio.enable) {
     enable = true;
     volumeStep = "1dB";
   };