ability to turn off the toolbar

When the toolbar was made customizable, there was already a default
toolbar.  To be extra sure we were compatible with any myclirc in the
world, the empty value for a toolbar format was made the same as the
default toolbar.

This introduces a special value None which makes the toolbar disappear
in the UI.

Motivation: the user may prefer the information in, for instance, a
tmux window title, or the prompt.  Or just a simpler UI.

Author: rolandwalker

changelog.md

@@ -1,3 +1,11 @@
+Upcoming (TBD)
+==============
+
+Features
+---------
+* Ability to turn off the toolbar.
+
+
 1.61.0 (2026/03/07)
 ==============
 

mycli/main.py

@@ -1267,11 +1267,15 @@ def one_iteration(text: str | None = None) -> None:
             query = Query(text, successful, mutating)
             self.query_history.append(query)
 
-        get_toolbar_tokens = create_toolbar_tokens_func(
-            self,
-            show_initial_toolbar_help,
-            self.toolbar_format,
-        )
+        if self.toolbar_format.lower() == 'none':
+            get_toolbar_tokens = None
+        else:
+            get_toolbar_tokens = create_toolbar_tokens_func(
+                self,
+                show_initial_toolbar_help,
+                self.toolbar_format,
+            )
+
         if self.wider_completion_menu:
             complete_style = CompleteStyle.MULTI_COLUMN
         else:

mycli/myclirc

@@ -136,7 +136,8 @@ prompt_continuation = '->'
 #
 # If \B is included, the additional content will begin on the next line.  More
 # lines can be added with \n.  If \B is not included, the customized toolbar
-# can be a single line.
+# can be a single line.  An empty value is the same as the default "\B".  The
+# special literal value "None" will suppress the toolbar from appearing.
 toolbar = ''
 
 # Skip intro info on startup and outro info on exit

test/myclirc

@@ -134,7 +134,8 @@ prompt_continuation = ->
 #
 # If \B is included, the additional content will begin on the next line.  More
 # lines can be added with \n.  If \B is not included, the customized toolbar
-# can be a single line.
+# can be a single line.  An empty value is the same as the default "\B".  The
+# special literal value "None" will suppress the toolbar from appearing.
 toolbar = ''
 
 # Skip intro info on startup and outro info on exit