##parameters=key=None
# $Id: get_csv_names.py 3162 2008-02-14 08:04:50Z joachim $
"""
Return the sessions as an vocabulary

"""
files = context.waeup_tool.get_csv_filenames()
if key is None:
    if files:
        l = [(f[:-4],f) for f in files]
    else:
        l = []
    l.insert(0,('--','without new data'))
    l.sort(cmp=lambda x,y: cmp(x[0].lower(), y[0].lower()))
    return l

if "%s.csv" % key in files:
    return files[files.index("%s.csv" % key)]
return ('--','without new data')