id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
490	Alias with missing argument gives cryptic error	meng@…	Greg Couch	"Using an alias without an argument gives a cryptic error message.  It should be a UserError saying ""Missing argument to alias 'snap'"".

alias snap save $1.png

snap

Traceback (most recent call last):
File ""/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/commands/cli.py"", line 2068, in _process_positional_arguments
value, text = self._parse_arg(anno, text, session, False)
File ""/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/commands/cli.py"", line 1915, in _parse_arg
value, replacement, rest = annotation.parse(text, session)
File ""/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/commands/cli.py"", line 646, in parse
raise AnnotationError(""Expected %s"" % StringArg.name)
chimerax.core.commands.cli.AnnotationError: Expected a text string

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File ""/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/cmd_line/tool.py"", line 148, in execute
cmd.run(cmd_text)
File ""/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/commands/cli.py"", line 2213, in run
prev_annos = self._process_positional_arguments()
File ""/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/commands/cli.py"", line 2084, in _process_positional_arguments
_user_kw(kw_name), err)
File ""/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/commands/cli.py"", line 318, in _user_kw
words = kw_name.split('_')
AttributeError: 'int' object has no attribute 'split'
"	defect	closed	major		Command Line		fixed						all	ChimeraX