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rio: implement "look" (thanks lf94)

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

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

@@ -210,6 +210,7 @@

 void		wmovemouse(Window*, Point);

 void		wpaste(Window*);

 void		wplumb(Window*);

+void		wlook(Window*);

 void		wrefresh(Window*, Rectangle);

 void		wrepaint(Window*);

 void		wresize(Window*, Image*, int);

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

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

@@ -62,6 +62,7 @@

 	Paste,

 	Snarf,

 	Plumb,

+	Look,

 	Send,

 	Scroll,

 };

@@ -71,6 +72,7 @@

  [Paste]		"paste",

  [Snarf]		"snarf",

  [Plumb]		"plumb",

+ [Look]		"look",

  [Send]		"send",

  [Scroll]		"scroll",

 			nil

@@ -814,6 +816,10 @@

 	case Plumb:

 		wplumb(w);

+		break;

+

+	case Look:

+		wlook(w);

 		break;

 	case Send:

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

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

@@ -889,6 +889,28 @@

 	plumbfree(m);

 }

+void

+wlook(Window *w)

+{

+	int i, n, e;

+

+	i = w->q1;

+	n = i - w->q0;

+	e = w->nr - n;

+	if(n <= 0 || e < n)

+		return;

+

+	while(runestrncmp(w->r+w->q0, w->r+i, n) != 0){

+		if(i < e)

+			i++;

+		else

+			i = 0;

+	}

+

+	wsetselect(w, i, i+n);

+	wshow(w, i);

+}

+

 int

 winborder(Window *w, Point xy)

 {