Added [theme] hidden= attribute...

...that makes a theme unavailable for selection in Preferences or
:theme (defaults to no)

The many "null" themes, and the editor theme make use of this now.

This could be useful for campaign cutscene themes, for example, which
shouldn't be used by users for regular gameplay.

changelog

@@ -91,6 +91,8 @@ Version 1.9.9+svn:
      [note]
    * Implemented red=, green=, and blue= for [objective], [gold_carryover], and
      [note]
+   * Added [theme] hidden= attribute that makes a theme unavailable for selection
+     in Preferences or :theme (defaults to no)
  * Miscellaneous and bug fixes:
    * Add --language/-L commandline option to set the language for that session
    * Fixed: Avoid copying of singular iterators in the whiteboard code

data/themes/default.cfg

@@ -8,6 +8,7 @@
 
 [theme]
     name=null
+    hidden=yes
     [resolution]
         width=1
         height=1

data/themes/dfool.cfg

@@ -5,6 +5,7 @@
 
 [theme]
     name=null
+    hidden=yes
     [resolution]
         width=1
         height=1

data/themes/editor.cfg

@@ -8,6 +8,7 @@
 
 [theme]
     name=null
+    hidden=yes
     [resolution]
         width=1
         height=1
@@ -16,6 +17,7 @@
 
 [theme]
     name=editor
+    hidden=yes
 
 #define DEFAULT_EDITOR_FONT_NORMAL
     14 #enddef

data/themes/experimental.cfg

@@ -7,6 +7,7 @@
 
 [theme]
     name=null
+    hidden=yes
     [resolution]
         width=1
         height=1

data/themes/widescreen.cfg

@@ -8,6 +8,7 @@
 
 [theme]
     name=null
+    hidden=yes
     [resolution]
         width=1
         height=1

src/theme.cpp

@@ -761,7 +761,7 @@ void theme::set_known_themes(const config* cfg)
 	foreach (const config &thm, cfg->child_range("theme"))
 	{
 		std::string thm_name = thm["name"];
-		if (thm_name != "null" && thm_name != "editor")
+		if (!thm["hidden"].to_bool(false))
 			known_themes[thm_name] = thm;
 	}
 }