Introduce a versioning mechanism, and an `About' box in all front

ends. Versioning will be done solely by Subversion revision number,
since development on these puzzles is very incremental and gradual
and there don't tend to be obvious points to place numbered
releases.

[originally from svn r5781]

osx.m

@@ -232,6 +232,98 @@ NSMenuItem *newitem(NSMenu *parent, char *title, char *key,
 		       parent, title, key, target, action);
 }
 
+/* ----------------------------------------------------------------------
+ * About box.
+ */
+
+@class AboutBox;
+
+@interface AboutBox : NSWindow
+{
+}
+- (id)init;
+@end
+
+@implementation AboutBox
+- (id)init
+{
+    NSRect totalrect;
+    NSView *views[16];
+    int nviews = 0;
+    NSImageView *iv;
+    NSTextField *tf;
+    NSFont *font1 = [NSFont systemFontOfSize:0];
+    NSFont *font2 = [NSFont boldSystemFontOfSize:[font1 pointSize] * 1.1];
+    const int border = 24;
+    int i;
+    double y;
+
+    /*
+     * Construct the controls that go in the About box.
+     */
+
+    iv = [[NSImageView alloc] initWithFrame:NSMakeRect(0,0,64,64)];
+    [iv setImage:[NSImage imageNamed:@"NSApplicationIcon"]];
+    views[nviews++] = iv;
+
+    tf = [[NSTextField alloc]
+	  initWithFrame:NSMakeRect(0,0,400,1)];
+    [tf setEditable:NO];
+    [tf setSelectable:NO];
+    [tf setBordered:NO];
+    [tf setDrawsBackground:NO];
+    [tf setFont:font2];
+    [tf setStringValue:@"Simon Tatham's Portable Puzzle Collection"];
+    [tf sizeToFit];
+    views[nviews++] = tf;
+
+    tf = [[NSTextField alloc]
+	  initWithFrame:NSMakeRect(0,0,400,1)];
+    [tf setEditable:NO];
+    [tf setSelectable:NO];
+    [tf setBordered:NO];
+    [tf setDrawsBackground:NO];
+    [tf setFont:font1];
+    [tf setStringValue:[NSString stringWithCString:ver]];
+    [tf sizeToFit];
+    views[nviews++] = tf;
+
+    /*
+     * Lay the controls out.
+     */
+    totalrect = NSMakeRect(0,0,0,0);
+    for (i = 0; i < nviews; i++) {
+	NSRect r = [views[i] frame];
+	if (totalrect.size.width < r.size.width)
+	    totalrect.size.width = r.size.width;
+	totalrect.size.height += border + r.size.height;
+    }
+    totalrect.size.width += 2 * border;
+    totalrect.size.height += border;
+    y = totalrect.size.height;
+    for (i = 0; i < nviews; i++) {
+	NSRect r = [views[i] frame];
+	r.origin.x = (totalrect.size.width - r.size.width) / 2;
+	y -= border + r.size.height;
+	r.origin.y = y;
+	[views[i] setFrame:r];
+    }
+
+    self = [super initWithContentRect:totalrect
+	    styleMask:(NSTitledWindowMask | NSMiniaturizableWindowMask |
+		       NSClosableWindowMask)
+	    backing:NSBackingStoreBuffered
+	    defer:YES];
+
+    for (i = 0; i < nviews; i++)
+	[[self contentView] addSubview:views[i]];
+
+    [self center];		       /* :-) */
+
+    return self;
+}
+@end
+
 /* ----------------------------------------------------------------------
  * The front end presented to midend.c.
  * 
@@ -1169,6 +1261,7 @@ void status_bar(frontend *fe, char *text)
 {
 }
 - (void)newGameWindow:(id)sender;
+- (void)about:(id)sender;
 @end
 
 @implementation AppController
@@ -1182,6 +1275,14 @@ void status_bar(frontend *fe, char *text)
     [win makeKeyAndOrderFront:self];
 }
 
+- (void)about:(id)sender
+{
+    id win;
+
+    win = [[AboutBox alloc] init];
+    [win makeKeyAndOrderFront:self];    
+}
+
 - (NSMenu *)applicationDockMenu:(NSApplication *)sender
 {
     NSMenu *menu = newmenu("Dock Menu");
@@ -1224,6 +1325,8 @@ int main(int argc, char **argv)
     [NSApp setMainMenu: newmenu("Main Menu")];
 
     menu = newsubmenu([NSApp mainMenu], "Apple Menu");
+    item = newitem(menu, "About Puzzles", "", NULL, @selector(about:));
+    [menu addItem:[NSMenuItem separatorItem]];
     [NSApp setServicesMenu:newsubmenu(menu, "Services")];
     [menu addItem:[NSMenuItem separatorItem]];
     item = newitem(menu, "Hide Puzzles", "h", NSApp, @selector(hide:));