Allow disabled options to be created

add_option() now has a "disabled" parameter, which will add the given
option as a simple indented text. This is very similar as calling
add_text(). The advantage of having this as a parameter to add_option()
is that disabled options can now be created from the shorthand function
cli_select_item() by passing each option as a tuple or dict, which has
disabled=True set.

This is a breaking change, as the parameter order of add_option()
changes.

clintermission/climenu.py

@@ -132,12 +132,16 @@ class CliMenu:
         for text in title.split('\n'):
             self._items.append(_CliMenuHeader(text, indent=indent, style=style))
 
-    def add_option(self, text, item=_EmptyParameter, style=None, highlighted_style=None):
-        if item == _EmptyParameter:
-            item = text
-        self._items.append(_CliMenuOption(text, self._item_num, item=item,
-                                          style=style, highlighted_style=highlighted_style))
-        self._item_num += 1
+    def add_option(self, text, item=_EmptyParameter, disabled=False, style=None, highlighted_style=None):
+        if disabled:
+            # this is basically a text option and we just throw the item away
+            self.add_text(title=text, style=style)
+        else:
+            if item == _EmptyParameter:
+                item = text
+            opt = _CliMenuOption(text, self._item_num, item=item, style=style, highlighted_style=highlighted_style)
+            self._items.append(opt)
+            self._item_num += 1
 
     @property
     def success(self):
@@ -272,6 +276,10 @@ class CliMenu:
         event.app.exit()
 
     def _run(self):
+        if self._item_num == 0:
+            self._success = False
+            return
+
         self._preflight()
 
         class MenuColorizer(Processor):
@@ -284,6 +292,7 @@ class CliMenu:
         @self._kb.add('q', filter=~is_searching)
         @self._kb.add('c-c')
         def quit(event):
+            self._success = False
             event.app.exit()
 
         @self._kb.add('down', filter=~is_searching)
@@ -336,7 +345,10 @@ class CliMenu:
                         self._searchbar])
 
         # set initial pos
-        for _ in range(self._initial_pos + 1):
+        while not self._items[self._pos].focusable:
+            self._pos += 1
+
+        for _ in range(self._initial_pos):
             self.next_item(1)
 
         app = Application(layout=Layout(split),
@@ -361,9 +373,11 @@ class CliMultiMenu(CliMenu):
         self._selection_icons = selection_icons if selection_icons is not None else self.default_selection_icons
         super().__init__(*args, **kwargs)
 
-    def add_option(self, text, item=_EmptyParameter, selected=False,
+    def add_option(self, text, item=_EmptyParameter, selected=False, disabled=False,
                    style=None, highlighted_style=None, selected_style=None, selected_highlighted_style=None):
         super().add_option(text, item, style, highlighted_style=highlighted_style)
+        if disabled:
+            return
         self._items[-1].selected_style = selected_style
         self._items[-1].selected_highlighted_style = selected_highlighted_style
         if selected: