shithub: dmenu

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dmenu: do not redraw when the list did not change

--- a/dmenu.c

+++ b/dmenu.c

@@ -154,12 +154,13 @@

 filter(char **lines, int nlines)

 {

 	char *buf, *words[64], **l, **m;

-	int nwords;

+	int nwords, old;

 	if((buf = smprint("%S", kbinput)) == nil)

 		sysfatal("malloc");

 	nwords = tokenize(buf, words, sizeof words / sizeof *words);

+	old = nmatches;

 	nmatches = 0;

 	m = matches;

 	for(l = lines; l < lines + nlines; l++)

@@ -171,7 +172,10 @@

 	selected = 0;

 	scroll = 0;

 	free(buf);

-	eresized(0); /* possibly different lines: redraw everything */

+	if (nmatches == old)  /* optimization */

+		drawprompt();

+	else

+		eresized(0);

 }

 static void

@@ -257,17 +261,17 @@

 static void

 mselect(Point pt)

 {

-	int old, sel = pointtoline(pt);

+	int old, new = pointtoline(pt);

-	if(sel < 0)

-		sel = 0;

-	if(nmatches > 0 && sel >= nmatches)

-		sel = nmatches - 1;

-	if(sel != selected){

+	if(new < 0)

+		new = 0;

+	if(nmatches > 0 && new >= nmatches)

+		new = nmatches - 1;

+	if(new != selected){

 		old = selected;

-		selected = sel;

+		selected = new;

 		drawline(old);

-		drawline(sel);

+		drawline(new);

 	}

 }

@@ -331,9 +335,11 @@

 			case Ctl('U'):

 				kbclear();

 				break;

+			case Ctl('P'):

 			case Kup:

 				kbmove(-1);

 				break;

+			case Ctl('N'):

 			case Kdown:

 				kbmove(+1);

 				break;