dwmstatus: allow muting the microphone

This has a function key on my laptop that has a neat LED on it.

dwmstatus.c

@@ -1718,9 +1718,12 @@ struct app_context
 
 	bool failed;                        ///< General PulseAudio failure
 
-	char *sink_name;                    ///< The sink to watch volume of
+	char *sink_name;                    ///< The default sink name
 	pa_cvolume volume;                  ///< Current volume
 	bool muted;                         ///< Currently muted?
+
+	char *source_name;                  ///< The default source name
+	bool source_muted;                  ///< Currently muted?
 };
 
 static void
@@ -1777,6 +1780,7 @@ app_context_free (struct app_context *self)
 	str_map_free (&self->nut_ups_info);
 
 	free (self->sink_name);
+	free (self->source_name);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -2448,18 +2452,31 @@ on_nut_reconnect (void *user_data)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 static void
-on_sink_info
+on_sink_info (pa_context *context, const pa_sink_info *info, int eol,
-	(pa_context *context, const pa_sink_info *info, int eol, void *userdata)
+	void *userdata)
 {
 	(void) context;
 
-	if (!info && eol)
+	if (info && !eol)
-		return;
+	{
-
 		struct app_context *ctx = userdata;
 		ctx->volume = info->volume;
 		ctx->muted = !!info->mute;
 		refresh_status (ctx);
+	}
+}
+
+static void
+on_source_info (pa_context *context, const pa_source_info *info, int eol,
+	void *userdata)
+{
+	(void) context;
+
+	if (info && !eol)
+	{
+		struct app_context *ctx = userdata;
+		ctx->source_muted = !!info->mute;
+	}
 }
 
 static void
@@ -2467,6 +2484,8 @@ update_volume (struct app_context *ctx)
 {
 	pa_operation_unref (pa_context_get_sink_info_by_name
 		(ctx->context, ctx->sink_name, on_sink_info, ctx));
+	pa_operation_unref (pa_context_get_source_info_by_name
+		(ctx->context, ctx->source_name, on_source_info, ctx));
 }
 
 static void
@@ -2476,7 +2495,9 @@ on_server_info (pa_context *context, const pa_server_info *info, void *userdata)
 
 	struct app_context *ctx = userdata;
 	free (ctx->sink_name);
-	ctx->sink_name = strdup (info->default_sink_name);
+	ctx->sink_name = xstrdup (info->default_sink_name);
+	free (ctx->source_name);
+	ctx->source_name = xstrdup (info->default_source_name);
 	update_volume (ctx);
 }
 
@@ -2484,7 +2505,6 @@ static void
 on_event (pa_context *context, pa_subscription_event_type_t event,
 	uint32_t index, void *userdata)
 {
-	(void) context;
 	(void) index;
 
 	struct app_context *ctx = userdata;
@@ -2493,15 +2513,21 @@ on_event (pa_context *context, pa_subscription_event_type_t event,
 	pa_subscription_event_type_t type =
 		event & PA_SUBSCRIPTION_EVENT_TYPE_MASK;
 
-	// XXX: can the default sink be removed before being changed?
+	switch (facility)
-	if (facility == PA_SUBSCRIPTION_EVENT_SINK
+	{
-	 && type == PA_SUBSCRIPTION_EVENT_CHANGE)
+	case PA_SUBSCRIPTION_EVENT_SINK:
+	case PA_SUBSCRIPTION_EVENT_SOURCE:
+		// XXX: can the defaults be removed before being changed?
+		if (type == PA_SUBSCRIPTION_EVENT_CHANGE)
 			update_volume (ctx);
-
+		break;
-	// Default sink could change
+	case PA_SUBSCRIPTION_EVENT_SERVER:
-	if (facility == PA_SUBSCRIPTION_EVENT_SERVER)
+		// Defaults could change
 		pa_operation_unref (pa_context_get_server_info (context,
 			on_server_info, userdata));
+	default:
+		break;
+	}
 }
 
 static void
@@ -2541,7 +2567,8 @@ on_context_state_change (pa_context *context, void *userdata)
 		pa_context_get_server_info (context, on_server_info, userdata);
 		pa_context_set_subscribe_callback (context, on_event, userdata);
 		pa_operation_unref (pa_context_subscribe (context,
-			PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SERVER,
+			PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SOURCE |
+			PA_SUBSCRIPTION_MASK_SERVER,
 			on_subscribe_finish, userdata));
 	default:
 		return;
@@ -2613,6 +2640,18 @@ on_volume_finish (pa_context *context, int success, void *userdata)
 	// Just like... whatever, man
 }
 
+static void
+on_volume_mic_mute (struct app_context *ctx, int arg)
+{
+	(void) arg;
+
+	if (!ctx->context)
+		return;
+
+	pa_operation_unref (pa_context_set_source_mute_by_name (ctx->context,
+		ctx->source_name, !ctx->source_muted, on_volume_finish, ctx));
+}
+
 static void
 on_volume_mute (struct app_context *ctx, int arg)
 {
@@ -2694,6 +2733,7 @@ g_keys[] =
 	{ Mod4Mask | Mod5Mask, XK_Page_Up,   on_volume_set,        1 },
 	{ Mod4Mask,            XK_Page_Down, on_volume_set,      -10 },
 	{ Mod4Mask | Mod5Mask, XK_Page_Down, on_volume_set,       -1 },
+	{ 0, XF86XK_AudioMicMute,            on_volume_mic_mute,   0 },
 	{ 0, XF86XK_AudioMute,               on_volume_mute,       0 },
 	{ 0, XF86XK_AudioRaiseVolume,        on_volume_set,       10 },
 	{ 0, XF86XK_AudioLowerVolume,        on_volume_set,      -10 },