Adjust style="" to do the right thing...

and squelch "set:raw" error in trying set PygmentsStyle

Author: rocky

mathicsscript/autoload/settings.m

@@ -16,10 +16,10 @@
 
 Settings`$ShowFullFormInput = False
 
-(* This is a workarund for a bug in mathicsscript of mathics-core.
+(* This is a workaround for a bug in mathicsscript of mathics-core.
  Remove this and we get error:
  Set::setraw: Cannot assign to raw object colorful. *)
-Settings`$PygmentsStyle = False
+Settings`$PygmentsStyle = Null
 
 Settings`$PygmentsStyle::usage = "This variable sets the Pygments style used to colorize output. The value should be a string.
 

mathicsscript/termshell.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-#   Copyright (C) 2020-2022, 2024 Rocky Bernstein <[email protected]>
+#   Copyright (C) 2020-2022, 2024, 2025 Rocky Bernstein <[email protected]>
 
 from columnize import columnize
 
@@ -67,7 +67,7 @@
 SymbolPygmentsStylesAvailable = Symbol("Settings`PygmentsStylesAvailable")
 
 
-def is_pygments_style(style: str):
+def is_pygments_style(style: str) -> bool:
     if style not in ALL_PYGMENTS_STYLES:
         print(f"Pygments style name '{style}' not found.")
         print(f"Style names are:\n{columnize(ALL_PYGMENTS_STYLES)}")
@@ -154,7 +154,7 @@ def __init__(
         )
 
     def change_pygments_style(self, style: str):
-        if style == self.pygments_style:
+        if not style or style == self.pygments_style:
             return False
         if is_pygments_style(style):
             self.terminal_formatter = Terminal256Formatter(style=style)

screenshots/README.md

@@ -12,7 +12,7 @@ I hit the _Tab_ key after `Inte` to get the completions
 
 Ater adding `gr` though there was just one completion: `Integrate`.
 
-To get the theta (θ), I entered: _escape_ theta _escape_.
+To get the theta (θ), I entered: _escape_ .Theta _escape_.
 
 The next time around I entered `\[The` and the _Tab_ key.