The (ice-9 getopt-long) facility is designed to help parse
arguments that are passed to Guile programs on the command line, and is
modelled after the C library’s facility of the same name
(see Getopt in The GNU C Library Reference Manual). For a more
low-level interface to command-line argument parsing, See SRFI-37 - args-fold.
The (ice-9 getopt-long) module exports two procedures:
getopt-long and option-ref.
getopt-long takes a list of strings — the command line
arguments — an option specification, and some optional keyword
parameters. It parses the command line arguments according to the
option specification and keyword parameters, and returns a data
structure that encapsulates the results of the parsing.
option-ref then takes the parsed data structure and a specific
option’s name, and returns information about that option in particular.
To make these procedures available to your Guile script, include the
expression (use-modules (ice-9 getopt-long)) somewhere near the
top, before the first usage of getopt-long or option-ref.