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reform/shortcuts: use Kmod4+esc to (un)mute the audio

--- a/sys/man/1/reform

+++ b/sys/man/1/reform

@@ -130,7 +130,9 @@

 .I Super+F1/F2

 decreases/increases LCD brightness,

 .I Super+F3/F4

-decreases/increases "master" volume.

+decreases/increases "master" volume,

+.I Super+Escape

+(un)mutes the audio.

 Optionally, a single step amount can be set with

 .I -l

 for LCD light level (default is 5) and

--- a/sys/src/cmd/reform/shortcuts.c

+++ b/sys/src/cmd/reform/shortcuts.c

@@ -3,7 +3,7 @@

 #include <keyboard.h>

 static int lightstep = 5, volstep = 3;

-static int light, vol, mod;

+static int light, vol, actl, mod;

 static void

 process(char *s)

@@ -34,7 +34,7 @@

 				continue;

 			if(r == Kmod4)

 				mod = 0;

-		}else if(mod && r >= (KF|1) && r <= (KF|4)){

+		}else if(mod && ((r >= (KF|1) && r <= (KF|4) || r == Kesc))){

 			if(*s == 'c'){

 				if(r == (KF|1))

 					fprint(light, "lcd %+d", -lightstep);

@@ -44,9 +44,11 @@

 					fprint(vol, "master %+d", -volstep);

 				else if(r == (KF|4))

 					fprint(vol, "master %+d", volstep);

+				else if(r == Kesc)

+					fprint(actl, "master toggle");

 			}

 			continue;

-			}

+		}

 		memmove(b+o, p, n);

 		o += n;

@@ -87,6 +89,7 @@

 	light = open("/dev/light", OWRITE);

 	vol = open("/dev/volume", OWRITE);

+	actl = open("/dev/audioctl", OWRITE);

 	for(i = 0;;){

 		if((n = read(0, b+i, sizeof(b)-i)) <= 0)

 			break;