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reform/shortcuts: negative step values

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

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

@@ -135,7 +135,10 @@

 .I -l

 for LCD light level (default is 5) and

 .I -v

-for volume (default is 3).

+for volume (default is 3).  Values can be negative to essentially swap

+.I F1

+with

+.IR F2 .

 .SH SOURCE

 .B /sys/src/cmd/reform

 .SH SEE ALSO

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

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

@@ -37,13 +37,13 @@

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

 			if(*s == 'c'){

 				if(r == (KF|1))

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

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

 				else if(r == (KF|2))

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

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

 				else if(r == (KF|3))

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

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

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

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

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

 			}

 			continue;

 			}