ui.backend: adding ui-stop-after-last-window?.

This defaults to true, except for the "ui.tools".  Also, this only
works on macOS right now.  Linux and Windows always stop after the
last window closes.

basis/ui/backend/backend.factor

@@ -5,6 +5,9 @@ IN: ui.backend
 
 SYMBOL: ui-backend
 
+SYMBOL: ui-stop-after-last-window?
+ui-stop-after-last-window? [ t ] initialize
+
 HOOK: set-title ui-backend ( string world -- )
 
 HOOK: (set-fullscreen) ui-backend ( world ? -- )

basis/ui/backend/cocoa/cocoa.factor

@@ -196,7 +196,12 @@ M: cocoa-ui-backend system-alert
     ] [ 2drop ] if* ;
 
 CLASS: FactorApplicationDelegate < NSObject
+
     METHOD: void applicationDidUpdate: id obj [ reset-thread-timer ] ;
+
+    METHOD: char applicationShouldTerminateAfterLastWindowClosed: id app [
+        ui-stop-after-last-window? get 1 0 ?
+    ] ;
 ;
 
 : install-app-delegate ( -- )

basis/ui/tools/tools.factor

@@ -1,12 +1,10 @@
 ! Copyright (C) 2006, 2009 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: memory system ui ui.commands ui.gestures ui.tools.browser
+USING: memory namespaces system ui ui.backend ui.commands
-ui.tools.common ui.tools.error-list ui.tools.listener
+ui.gestures ui.tools.browser ui.tools.common
-vocabs.refresh ;
+ui.tools.error-list ui.tools.listener vocabs.refresh ;
 IN: ui.tools
 
-MAIN: listener-window
-
 \ refresh-all H{ { +nullary+ t } { +listener+ t } } define-command
 
 \ save H{ { +nullary+ t } } define-command
@@ -29,3 +27,9 @@ tool "common" f {
     { T{ key-down f f "F2" } refresh-all }
     { T{ key-down f f "F3" } show-error-list }
 } define-command-map
+
+: ui-tools-main ( -- )
+    f ui-stop-after-last-window? set-global
+    listener-window ;
+
+MAIN: ui-tools-main