Evaluator: Limit; fix crash sukeesh#649

pnhofmann · Feb 15, 2020 · 462a461 · 462a461
1 parent cac5437
commit 462a461
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/jarviscli/plugins/evaluator.py b/jarviscli/plugins/evaluator.py
@@ -148,6 +148,10 @@ def try_limit(term, x, to, directory=''):
         except NotImplementedError:
             return "Sorry, cannot solve..."
 
+    if s == '':
+        jarvis.say("Usage: limit TERM")
+        return
+
     s_split = s.split()
     limit_to = []
     term = ""
@@ -163,7 +167,12 @@ def try_limit(term, x, to, directory=''):
 
     term = remove_equals(jarvis, term)
     term = format_expression(term)
-    term = solve_y(term)
+
+    try:
+        term = solve_y(term)
+    except (sympy.SympifyError, TypeError):
+        jarvis.say('Error, not a valid term')
+        return
 
     x = sympy.Symbol('x')