From a12e799bd326e0b745a50401e0f4d5336d89fb34 Mon Sep 17 00:00:00 2001
From: dgw <dgw@technobabbl.es>
Date: Thu, 21 Sep 2023 01:52:22 -0500
Subject: [PATCH] calc: gracefully handle `ExpressionEvaluator.Error`

We might consider making this exception a standalone class, for less
wacky-looking error handling in this and other consumers of the
`tools.calculation` submodule. Doing `except a_function.Subclass` feels
weird and wrong.
---
 sopel/modules/calc.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sopel/modules/calc.py b/sopel/modules/calc.py
index 2c87bb217c..f591a3ab01 100644
--- a/sopel/modules/calc.py
+++ b/sopel/modules/calc.py
@@ -30,6 +30,9 @@ def c(bot, trigger):
     try:
         result = eval_equation(eqn)
         result = "{:.10g}".format(result)
+    except eval_equation.Error as err:
+        bot.reply("Can't process expression: {}".format(str(err)))
+        return
     except ZeroDivisionError:
         bot.reply('Division by zero is not supported in this universe.')
         return