On Wednesday, October 12, 2016 at 3:15:11 PM UTC-4, Ian Thomas wrote:
> On Wednesday, October 12, 2016 at 10:19:28 AM UTC-4, Ben Greenman wrote:
> > Alright, here's something that I think does what you want.
> > #lang racket
> > (require racket/base
> > racket/cmdline)
> > (parse-command-line "com_line"
> > ;; argv
> > (current-command-line-arguments)
> > ;; table
> > `((once-each
> > [("-i" "--input-file")
> > ,(lambda (flag) (displayln "Using <in>"))
> > ("Use input file as the input file.")]))
> > ;; finish-proc
> > (lambda (flag-accum file) file)
> > ;; arg-help-strs
> > '("Input file.")
> > ;; help-proc
> > (lambda (flag) (raise-user-error "com_line -i | --input-file input file")))
> > ;; $ ./com_line --input-file "hacking.rkt"
> > ;; Using <in>
> > ;; "hacking.rkt"
> > ;; $ ./com_line --help
> > ;; com_line -i | --input-file input file
> > The code in your last message expects 1 flag, 1 argument to the flag
> > (`in`), and 1 `file` argument.
> Okay - I've figured this out. Output from testing below. I'll add in exit
> codes for the help-proc and unknown-proc so the finish-proc is never executed
> in cases where the user asks for help or uses an unknown flag. I'd rather
> return exit codes instead of raising an error as this code will likely be
> interacting with other code via a shell. Thanks for the exception handling
I now believe I have a handle on how parse-command-line works. Working code
that does what I want is below. Marking this post complete.
(define usage "date_analyzer [-l --enable-logging] <input file>")
(displayln "Enable logging of errors to a log
("Enable logging to a log file.")]))
(lambda (flag-accum input_file)
(displayln (string-append "Run analysis on the data in "
(displayln (string-append "Unknown flag: " unknown_flag))
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