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accessing repeated flagged values using (ice-9 getopt-long)

From: Matt Wette
Subject: accessing repeated flagged values using (ice-9 getopt-long)
Date: Mon, 21 Dec 2015 11:03:55 -0800

Hi Folks,

This was filed to address@hidden  (feature addition) about two months ago, #21698.   There has been no reaction there so I was wondering what others thought .  This is in context to guile-2.0.11.   The issue is that getopt-long goes not handle repeated flags like some may like.  I have provided a patch to add a new procedure “option-ref/many”.



The (ice-9 getopt-long) module does not provide a process for accessing multiple command line arguments.

A patch for ice-9/getopt-long.scm is attached which adds the procedure getopt-ref/many to access multiple argument values.

The following program and results illustrate the use of the current getopt-ref and the proposed getopt-ref/many:

mwette$ ./gotest.scm -f foo1 -b bar1 -f foo2 baz1 baz2
program arguments:
("./gotest.scm" "-f" "foo1" "-b" "bar1" "-f" "foo2" "baz1" "baz2")

getopt using option-ref:
foo: "foo2"
bar: "bar1"

getopt using option-ref/many:
foo: ("foo1" "foo2")

bar: "bar1"


mwette$ cat gotest.scm 
(use-modules (ice-9 getopt-long))

(define spec
 '((foo (single-char #\f) (value #t))
   (bar (single-char #\b) (value #t))))

(let* ((args (program-arguments))
       (opts (getopt-long args spec)))
  (simple-format #t "program arguments:\n")
  (simple-format #t "~S\n" args)

  (simple-format #t "\ngetopt using option-ref:\n")
  (simple-format #t "foo: ~S\n" (option-ref opts 'foo #f))
  (simple-format #t "bar: ~S\n" (option-ref opts 'bar #f))

  (simple-format #t "\ngetopt using option-ref/many:\n")
  (simple-format #t "foo: ~S\n" (option-ref/many opts 'foo #f))
  (simple-format #t "bar: ~S\n" (option-ref/many opts 'bar #f))

Attachment: getopt-long.patch
Description: Binary data

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