Merge pull request #117 from python-cmd2/history_exception

Bug fix for history exception

Author: tleonhardt

cmd2.py

@@ -1610,8 +1610,11 @@ def do_history(self, arg, opts):
         if arg:
             # If a character indicating a slice is present, retrieve a slice of the history
             if '..' in arg or ':' in arg:
-                # Get a slice of history
-                history = self.history.span(arg)
+                try:
+                    # Get a slice of history
+                    history = self.history.span(arg)
+                except IndexError:
+                    history = self.history.get(arg)
             else:
                 # Get item(s) from history by index or string search
                 history = self.history.get(arg)

tests/test_cmd2.py

@@ -206,6 +206,17 @@ def test_history_with_span_end(base_app):
 """)
     assert out == expected
 
+def test_history_with_span_index_error(base_app):
+    run_cmd(base_app, 'help')
+    run_cmd(base_app, 'help history')
+    run_cmd(base_app, '!ls -hal :')
+    out = run_cmd(base_app, 'history "hal :"')
+    expected = normalize("""
+-------------------------[3]
+!ls -hal :
+""")
+    assert out == expected
+
 
 def test_base_cmdenvironment(base_app):
     out = run_cmd(base_app, 'cmdenvironment')