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triple click selection in rio

same as sam and vt, three clicks selects a
whitespace-delimited line.

--- a/sys/src/cmd/rio/dat.h

+++ b/sys/src/cmd/rio/dat.h

@@ -195,7 +195,7 @@

 void		wcurrent(Window*);

 void		wcut(Window*);

 void		wdelete(Window*, uint, uint);

-void		wdoubleclick(Window*, uint*, uint*);

+void		wstretchsel(Window*, uint*, uint*, int);

 void		wfill(Window*);

 void		wframescroll(Window*, int);

 void		wkeyctl(Window*, Rune);

--- a/sys/src/cmd/rio/fns.h

+++ b/sys/src/cmd/rio/fns.h

@@ -9,6 +9,7 @@

 int	max(int, int);

 Rune*	strrune(Rune*, Rune);

 int	isalnum(Rune);

+int	isspace(Rune);

 void	timerstop(Timer*);

 void	timercancel(Timer*);

 Timer*	timerstart(int);

--- a/sys/src/cmd/rio/util.c

+++ b/sys/src/cmd/rio/util.c

@@ -105,6 +105,13 @@

 	return TRUE;

 }

+int

+isspace(Rune c)

+{

+	return c == 0 || c == ' ' || c == '\t' ||

+		c == '\n' || c == '\r' || c == '\v';

+}

+

 Rune*

 strrune(Rune *s, Rune c)

 {

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -962,6 +962,7 @@

 static Window	*clickwin;

 static uint	clickmsec;

+static uint	clickcount;

 static Window	*selectwin;

 static uint	selectq;

@@ -1007,7 +1008,7 @@

 wselect(Window *w)

 {

 	uint q0, q1;

-	int b, x, y, first;

+	int b, x, y, dx, dy, mode, first;

 	first = 1;

 	selectwin = w;

@@ -1018,16 +1019,25 @@

 	q0 = w->q0;

 	q1 = w->q1;

 	selectq = w->org+frcharofpt(w, w->mc.xy);

-	if(clickwin==w && w->mc.msec-clickmsec<500)

-	if(q0==q1 && selectq==w->q0){

-		wdoubleclick(w, &q0, &q1);

+	clickcount++;

+	if(w->mc.msec-clickmsec >= 500 || clickwin != w || clickcount > 3)

+		clickcount = 0;

+	if(clickwin == w && clickcount >= 1 && w->mc.msec-clickmsec < 500){

+		mode = (clickcount > 2) ? 2 : clickcount;

+		wstretchsel(w, &q0, &q1, mode);

 		wsetselect(w, q0, q1);

 		x = w->mc.xy.x;

 		y = w->mc.xy.y;

 		/* stay here until something interesting happens */

-		do

+		while(1){

 			readmouse(&w->mc);

-		while(w->mc.buttons==b && abs(w->mc.xy.x-x)<3 && abs(w->mc.xy.y-y)<3);

+			dx = abs(w->mc.xy.x-x);

+			dy = abs(w->mc.xy.y-y);

+			if(w->mc.buttons != b || dx >= 3 && dy >= 3)

+				break;

+			clickcount++;

+			clickmsec = w->mc.msec;

+		}

 		w->mc.xy.x = x;	/* in case we're calling frselect */

 		w->mc.xy.y = y;

 		q0 = w->q0;	/* may have changed */

@@ -1034,7 +1044,7 @@

 		q1 = w->q1;

 		selectq = q0;

 	}

-	if(w->mc.buttons == b){

+	if(w->mc.buttons == b && clickcount == 0){

 		w->scroll = framescroll;

 		frselect(w, &w->mc);

 		/* horrible botch: while asleep, may have lost selection altogether */

@@ -1051,15 +1061,13 @@

 			q1 = w->org+w->p1;

 	}

 	if(q0 == q1){

-		if(q0==w->q0 && clickwin==w && w->mc.msec-clickmsec<500){

-			wdoubleclick(w, &q0, &q1);

-			clickwin = nil;

-		}else{

+		mode = (clickcount > 2) ? 2 : clickcount;

+		if(q0==w->q0 && clickwin==w && w->mc.msec-clickmsec<500)

+			wstretchsel(w, &q0, &q1, mode);

+		else

 			clickwin = w;

-			clickmsec = w->mc.msec;

-		}

-	}else

-		clickwin = nil;

+		clickmsec = w->mc.msec;

+	}

 	wsetselect(w, q0, q1);

 	while(w->mc.buttons){

 		w->mc.msec = 0;

@@ -1079,7 +1087,8 @@

 		wscrdraw(w);

 		while(w->mc.buttons == b)

 			readmouse(&w->mc);

-		clickwin = nil;

+		if(w->mc.msec-clickmsec >= 500)

+			clickwin = nil;

 	}

 }

@@ -1483,8 +1492,14 @@

 	nil

 };

+int

+inmode(Rune r, int mode)

+{

+	return (mode == 1) ? isalnum(r) : r && !isspace(r);

+}

+

 void

-wdoubleclick(Window *w, uint *q0, uint *q1)

+wstretchsel(Window *w, uint *q0, uint *q1, int mode)

 {

 	int c, i;

 	Rune *r, *l, *p;

@@ -1522,10 +1537,10 @@

 		}

 	}

 	/* try filling out word to right */

-	while(*q1<w->nr && isalnum(w->r[*q1]))

+	while(*q1<w->nr && inmode(w->r[*q1], mode))

 		(*q1)++;

 	/* try filling out word to left */

-	while(*q0>0 && isalnum(w->r[*q0-1]))

+	while(*q0>0 && inmode(w->r[*q0-1], mode))

 		(*q0)--;

 }