consult environment variable TREPAN_PYGMENTS_STYLE

in order to get a default value for pygments style

Author: rocky

trepan/lib/default.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-#   Copyright (C) 2008-2009, 2013, 2015, 2017, 2020-2021, 2023-2024
+#   Copyright (C) 2008-2009, 2013, 2015, 2017, 2020-2021, 2023-2025
 #   Rocky Bernstein <rocky@gnu.org>
 #
 #   This program is free software: you can redistribute it and/or modify
@@ -26,7 +26,15 @@
 
 width = computed_displaywidth()
 is_dark_bg = is_dark_background()
-default_style = "zenburn" if is_dark_bg else "tango"
+
+
+# If TREPAN_PYGMENTS_STYLE has been set, use that as the defalt.
+pygments_style_from_environment = os.environ.get("TREPAN_PYGMENTS_STYLE", None)
+
+if pygments_style_from_environment is not None:
+    default_style = pygments_style_from_environment
+else:
+    default_style = "zenburn" if is_dark_bg else "tango"
 
 # Below are the default debugger settings. The debugger object version
 # of this may change. A setting is something a user may want to

trepan/processor/command/set_subcmd/style.py

@@ -1,7 +1,8 @@
 # -*- coding: utf-8 -*-
-#   Copyright (C) 2015, 2017-2018, 2020, 2024 Rocky Bernstein
+#   Copyright (C) 2015, 2017-2018, 2020, 2024-2025 Rocky Bernstein
 #
 
+import os
 from pygments.styles import STYLE_MAP
 from trepan.lib.complete import complete_token
 from trepan.processor.command.base_subcmd import DebuggerSubcommand
@@ -51,6 +52,8 @@ def run(self, args):
             return
 
         self.debugger.settings[self.name] = args[0]
+        # Set an environment variable so subshells pick up this setting.
+        os.environ["TREPAN_PYGMENTS_STYLE"] = args[0]
         return
 
     pass