Pass KeyShortcutHandler consumers a printable prefixmap represention. Close #154.

src/kiss_tools/KeyShortcutHandler.hx

@@ -5,7 +5,7 @@ import kiss.Stream;
 import kiss.List;
 
 typedef PrefixMap<T> = Map<String, ShortcutKey<T>>;
-typedef PrefixMapHandler<T> = (Map<String, ShortcutKey<T>>) -> Void;
+typedef PrefixMapHandler<T> = (Map<String, ShortcutKey<T>>, Map<String,String>) -> Void;
 typedef ItemHandler<T> = (T) -> Void;
 typedef FinishHandler = () -> Void;
 typedef BadKeyHandler<T> = (String, PrefixMap<T>) -> Void;

src/kiss_tools/KeyShortcutHandler.kiss

@@ -21,7 +21,7 @@
 
 (method _selectMap [m]
     (set currentMap m)
-    (tryCall onSelectPrefixMap m))
+    (tryCall onSelectPrefixMap m (prefixMapToStrings m)))
 
 (method start []
     (_selectMap rootMap))
@@ -100,3 +100,11 @@
 (method :Void registerItem [description :T item]
     (whenLet [keyboardShortcut (extractKeyboardShortcuts description)]
         (registerShortcut keyboardShortcut description item)))
+
+(method :Map<String,String> prefixMapToStrings [:PrefixMap<T> map]
+    (for =>key mapping map
+        =>key (case mapping
+                        ((Cancel _) "cancel")
+                        ((Final thing) (Std.string thing))
+                        ((Prefix map) (.join (collect (map.keys)) ", "))
+                        (never null))))