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plan9: (un)comment a block with # instead of filling it all

--- a/plan9.c

+++ b/plan9.c

@@ -476,10 +476,29 @@

 static void

 selset(Rune key)

 {

-	int y;

+	int y, commented;

-	for (y = cury; y < cury+selh && y < field.height; y++)

-		memset(&field.buffer[curx + field.width*y], key, MIN(field.width-curx, selw));

+	if (key == '#') {

+		commented = 1;

+		for (y = cury; y < cury+selh && y < field.height && commented; y++) {

+			commented =

+				field.buffer[curx + field.width*y] == key &&

+				field.buffer[MIN(field.width-1, curx + selw-1) + field.width*y] == key;

+		}

+		if (commented)

+			key = '.';

+	} else {

+		commented = 0;

+	}

+

+	for (y = cury; y < cury+selh && y < field.height; y++) {

+		if (key == '#' || commented) {

+			field.buffer[curx + field.width*y] = key;

+			field.buffer[MIN(field.width-1, curx + selw-1) + field.width*y] = key;

+		} else {

+			memset(&field.buffer[curx + field.width*y], key, MIN(field.width-curx, selw));

+		}

+	}

 }

 static void