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add generic pipe menu option

	this new option allows to pipe the image to any external command.
	The external command is obviously expected to output an image in
	9 format.

--- a/view.c

+++ b/view.c

@@ -30,6 +30,7 @@

 	Mvflip,

 	Mrotleft,

 	Mrotright,

+	Mpipeto,

 };

 char *menu2str[] =

 {

@@ -37,6 +38,7 @@

 	"flip vert.",

 	"rotate left",

 	"rotate right",

+	"pipe to...",

 	nil,

 };

 Menu menu2 = { menu2str };

@@ -257,15 +259,35 @@

 {

 	Image *i;

 	int n;

+	char buf[255];

+	i = nil;

 	n = menuhit(2, mctl, &menu2, nil);

-	if(n >= 0){

+	switch(n){

+	case Mhflip:

+	case Mvflip:

+	case Mrotleft:

+	case Mrotright:

 		i = rotate(n);

-		freeimage(img);

-		img = i;

-		pos = subpt(ZP, img->r.min);

-		redraw();

+		if(i == nil){

+			fprint(2, "unable to rotate image: %r\n");

+			return;

+		}

+		break;

+	case Mpipeto:

+		if(enter("command:", buf, sizeof buf, mctl, kctl, nil) > 0){

+			i = ipipeto(img, buf);

+			if(i == nil){

+				fprint(2, "unable to pipe image: %r\n");

+				return;

+			}

+		}

+		break;

 	}

+	freeimage(img);

+	img = i;

+	pos = subpt(ZP, img->r.min);

+	redraw();

 }

 void