Given the following code
(defn parse-opts
"Using the newer cli library, parses command line args."
[args]
(cli args
(optional ["--in-file-name" ".csv input file" :default
"resultset.csv"] identity)
(optional ["--out-file-name" ".csv pipe delimited output file"
:default "accumail_out.unl"] )))
What is the origin of optional, and why do tools.cli examples that I can
find now leave out (optional ... ?
Would current examples still use identity?
Here is why I'm asking:
http://stackoverflow.com/questions/12112403/how-do-i-mix-non-optional-cli-arguments-with-optional-ones
Thanks for any pointers or help.
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