make displaying volume level in statusbar optional

doc/config

@@ -314,6 +314,8 @@
 #
 #clock_display_seconds = "no"
 #
+#display_volume_level = "yes"
+#
 #display_bitrate = "no"
 #
 #display_remaining_time = "no"

doc/ncmpcpp.1

@@ -240,6 +240,9 @@ If enabled, user will be asked if he really wants to clear the main playlist aft
 .B clock_display_seconds = yes/no
 If enabled, clock will display time in format hh:mm:ss, otherwise hh:mm.
 .TP 
+.B display_volume_level = yes/no
+If enabled, volume level will be displayed in statusbar, otherwise not.
+.TP 
 .B display_bitrate = yes/no
 If enabled, bitrate of currently playing song will be displayed in statusbar.
 .TP 

src/settings.cpp

@@ -357,6 +357,7 @@ void NcmpcppConfig::SetDefaults()
 	display_screens_numbers_on_start = true;
 	jump_to_now_playing_song_at_start = true;
 	clock_display_seconds = false;
+	display_volume_level = true;
 	display_bitrate = false;
 	display_remaining_time = false;
 	ignore_leading_the = false;
@@ -907,6 +908,10 @@ void NcmpcppConfig::Read()
 			{
 				clock_display_seconds = v == "yes";
 			}
+			else if (cl.find("display_volume_level") != std::string::npos)
+			{
+				display_volume_level = v == "yes";
+			}
 			else if (cl.find("display_bitrate") != std::string::npos)
 			{
 				display_bitrate = v == "yes";

src/settings.h

@@ -210,6 +210,7 @@ struct NcmpcppConfig
 	bool display_screens_numbers_on_start;
 	bool jump_to_now_playing_song_at_start;
 	bool clock_display_seconds;
+	bool display_volume_level;
 	bool display_bitrate;
 	bool display_remaining_time;
 	bool ignore_leading_the;

src/status.cpp

@@ -600,7 +600,7 @@ void NcmpcppStatusChanged(MPD::Connection *, MPD::StatusChanges changed, void *)
 			refresh();
 		}
 	}
-	if (changed.Volume && (Config.header_visibility || Config.new_design))
+	if (changed.Volume && Config.display_volume_level && (Config.header_visibility || Config.new_design))
 	{
 		VolumeState = Config.new_design ? " Vol: " : " Volume: ";
 		int volume = Mpd.GetVolume();