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initial plumber support

	for the time being, only accept plumb messages with filename but not
	showdata messages.

--- a/view.c

+++ b/view.c

@@ -4,6 +4,7 @@

 #include <thread.h>

 #include <mouse.h>

 #include <keyboard.h>

+#include <plumb.h>

 #include <stb.h>

 #include "a.h"

@@ -127,6 +128,36 @@

 }

 void

+plumbproc(void*)

+{

+	Plumbmsg *m;

+	int fd;

+	char *a;

+

+	threadsetname("plumbproc");

+	fd = plumbopen("image", OREAD);

+	if(fd < 0)

+		sysfatal("plumbopen: %r");

+	for(;;){

+		m = plumbrecv(fd);

+		if(m == nil)

+			sysfatal("plumbrecv: %r");

+		a = plumblookup(m->attr, "action");

+		if(a != nil && strncmp(a, "showdata", 8) == 0){

+			fprint(2, "showdata: not implemented");

+		}else{

+			free(img);

+			img = load(m->data);

+			if(img == nil)

+				sysfatal("load: %r");

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

+			redraw();

+		}

+		plumbfree(m);

+	}

+}

+

+void

 evtresize(int new)

 {

 	if(new && getwindow(display, Refnone)<0)

@@ -196,6 +227,7 @@

 	alts[Eresize].c = mctl->resizec;

 	alts[Ekeyboard].c = kctl->c;

 	initbg();

+	proccreate(plumbproc, nil, 8192);

 	img = load(*argv);

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

 	evtresize(0);