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paint: open existing files for editing

--- a/sys/man/1/paint

+++ b/sys/man/1/paint

@@ -3,7 +3,7 @@

 .SH NAME

 paint \- create image files by drawing with a mouse or other pointing device

 .SH SYNOPSIS

-.B paint

+.B paint [file]

 .SH DESCRIPTION

 .I Paint

 provides a window upon which can be drawn lines by moving the cursor while

@@ -24,6 +24,9 @@

 .TP

 .B c

 Clear the screen. Any unsaved work will be lost.

+.TP

+.B o

+Open a bitmap image file for editing.

 .TP

 .B s

 Save the current screen as a bitmap image. A pop-up box appears

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

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

@@ -10,6 +10,22 @@

 		sysfatal("resize failed");

 }

+void

+loadimg(char *name)

+{

+	Image *b;

+	int fd;

+

+	fd=open(name, OREAD);

+	if(fd==-1)

+		sysfatal("can't open file");

+	if((b=readimage(display, fd, 0)) == nil)

+		sysfatal("can't read image");

+	draw(screen, screen->r, b, 0, b->r.min);

+	flushimage(display, 1);

+	close(fd);

+}

+

 /* stolen from mothra */

 void

 screendump(char *name, int full)

@@ -35,7 +51,7 @@

 }

 void

-main()

+main(int argc, char *argv[])

 {

 	Event e;

 	Point last;

@@ -52,6 +68,23 @@

 	einit(Emouse | Ekeyboard);

 	draw(screen, screen->r, display->white, 0, ZP);

 	flushimage(display, 1);

+

+	ARGBEGIN{

+	default:

+		goto Usage;

+	}ARGEND

+	switch(argc){

+	default:

+	Usage:

+		fprint(2, "Usage: [file]\n");

+		exits("usage");

+	case 0:

+		break;

+	case 1:

+		loadimg(argv[0]);

+		break;

+	}

+

 	while(1){

 		switch(event(&e)){

 		case Emouse:

@@ -79,6 +112,11 @@

 			}

 			if(e.kbdc == 'c')

 				draw(screen, screen->r, display->white, 0, ZP);

+			if(e.kbdc == 'o'){

+				if(eenter("Open file", file, sizeof(file), &e.mouse) <= 0)

+					break;

+				loadimg(file);

+			}

 			if(e.kbdc == 'q')

 				exits(nil);

 			if(e.kbdc == 's'){