mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-11-18 20:57:12 -05:00
1959fb04dc
* srfi/srfi-37.scm.in: New file, taken from Guile 2.0.9. * m4/guix.m4: New macro. * configure.ac: Use it. Define Automake conditional `INSTALL_SRFI_37'. * Makefile.am (nobase_nodist_guilemodule_DATA)[INSTALL_SRFI_37]: Add srfi/srfi-37.scm. (GOBJECTS)[INSTALL_SRFI_37]: Add srfi/srfi-37.go. (srfi/srfi-37.scm)[INSTALL_SRFI_37]: New target. (EXTRA_DIST): Add srfi/srfi-37.scm.in.
233 lines
8.4 KiB
Scheme
233 lines
8.4 KiB
Scheme
;;; srfi-37.scm --- args-fold
|
||
|
||
;; Copyright (C) 2007, 2008, 2013 Free Software Foundation, Inc.
|
||
;;
|
||
;; This library is free software; you can redistribute it and/or
|
||
;; modify it under the terms of the GNU Lesser General Public
|
||
;; License as published by the Free Software Foundation; either
|
||
;; version 3 of the License, or (at your option) any later version.
|
||
;;
|
||
;; This library is distributed in the hope that it will be useful,
|
||
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
;; Lesser General Public License for more details.
|
||
;;
|
||
;; You should have received a copy of the GNU Lesser General Public
|
||
;; License along with this library; if not, write to the Free Software
|
||
;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
||
|
||
;;; Commentary:
|
||
;;
|
||
;; To use this module with Guile, use (cdr (program-arguments)) as
|
||
;; the ARGS argument to `args-fold'. Here is a short example:
|
||
;;
|
||
;; (args-fold (cdr (program-arguments))
|
||
;; (let ((display-and-exit-proc
|
||
;; (lambda (msg)
|
||
;; (lambda (opt name arg)
|
||
;; (display msg) (quit) (values)))))
|
||
;; (list (option '(#\v "version") #f #f
|
||
;; (display-and-exit-proc "Foo version 42.0\n"))
|
||
;; (option '(#\h "help") #f #f
|
||
;; (display-and-exit-proc
|
||
;; "Usage: foo scheme-file ..."))))
|
||
;; (lambda (opt name arg)
|
||
;; (error "Unrecognized option `~A'" name))
|
||
;; (lambda (op) (load op) (values)))
|
||
;;
|
||
;;; Code:
|
||
|
||
|
||
;;;; Module definition & exports
|
||
(define-module (srfi srfi-37)
|
||
#:use-module (srfi srfi-9)
|
||
#:export (option option-names option-required-arg?
|
||
option-optional-arg? option-processor
|
||
args-fold))
|
||
|
||
(cond-expand-provide (current-module) '(srfi-37))
|
||
|
||
;;;; args-fold and periphery procedures
|
||
|
||
;;; An option as answered by `option'. `names' is a list of
|
||
;;; characters and strings, representing associated short-options and
|
||
;;; long-options respectively that should use this option's
|
||
;;; `processor' in an `args-fold' call.
|
||
;;;
|
||
;;; `required-arg?' and `optional-arg?' are mutually exclusive
|
||
;;; booleans and indicate whether an argument must be or may be
|
||
;;; provided. Besides the obvious, this affects semantics of
|
||
;;; short-options, as short-options with a required or optional
|
||
;;; argument cannot be followed by other short options in the same
|
||
;;; program-arguments string, as they will be interpreted collectively
|
||
;;; as the option's argument.
|
||
;;;
|
||
;;; `processor' is called when this option is encountered. It should
|
||
;;; accept the containing option, the element of `names' (by `equal?')
|
||
;;; encountered, the option's argument (or #f if none), and the seeds
|
||
;;; as variadic arguments, answering the new seeds as values.
|
||
(define-record-type srfi-37:option
|
||
(option names required-arg? optional-arg? processor)
|
||
option?
|
||
(names option-names)
|
||
(required-arg? option-required-arg?)
|
||
(optional-arg? option-optional-arg?)
|
||
(processor option-processor))
|
||
|
||
(define (error-duplicate-option option-name)
|
||
(scm-error 'program-error "args-fold"
|
||
"Duplicate option name `~A~A'"
|
||
(list (if (char? option-name) #\- "--")
|
||
option-name)
|
||
#f))
|
||
|
||
(define (build-options-lookup options)
|
||
"Answer an `equal?' Guile hash-table that maps OPTIONS' names back
|
||
to the containing options, signalling an error if a name is
|
||
encountered more than once."
|
||
(let ((lookup (make-hash-table (* 2 (length options)))))
|
||
(for-each
|
||
(lambda (opt)
|
||
(for-each (lambda (name)
|
||
(let ((assoc (hash-create-handle!
|
||
lookup name #f)))
|
||
(if (cdr assoc)
|
||
(error-duplicate-option (car assoc))
|
||
(set-cdr! assoc opt))))
|
||
(option-names opt)))
|
||
options)
|
||
lookup))
|
||
|
||
(define (args-fold args options unrecognized-option-proc
|
||
operand-proc . seeds)
|
||
"Answer the results of folding SEEDS as multiple values against the
|
||
program-arguments in ARGS, as decided by the OPTIONS'
|
||
`option-processor's, UNRECOGNIZED-OPTION-PROC, and OPERAND-PROC."
|
||
(let ((lookup (build-options-lookup options)))
|
||
;; I don't like Guile's `error' here
|
||
(define (error msg . args)
|
||
(scm-error 'misc-error "args-fold" msg args #f))
|
||
|
||
(define (mutate-seeds! procedure . params)
|
||
(set! seeds (call-with-values
|
||
(lambda ()
|
||
(apply procedure (append params seeds)))
|
||
list)))
|
||
|
||
;; Clean up the rest of ARGS, assuming they're all operands.
|
||
(define (rest-operands)
|
||
(for-each (lambda (arg) (mutate-seeds! operand-proc arg))
|
||
args)
|
||
(set! args '()))
|
||
|
||
;; Call OPT's processor with OPT, NAME, an argument to be decided,
|
||
;; and the seeds. Depending on OPT's *-arg? specification, get
|
||
;; the parameter by calling REQ-ARG-PROC or OPT-ARG-PROC thunks;
|
||
;; if no argument is allowed, call NO-ARG-PROC thunk.
|
||
(define (invoke-option-processor
|
||
opt name req-arg-proc opt-arg-proc no-arg-proc)
|
||
(mutate-seeds!
|
||
(option-processor opt) opt name
|
||
(cond ((option-required-arg? opt) (req-arg-proc))
|
||
((option-optional-arg? opt) (opt-arg-proc))
|
||
(else (no-arg-proc) #f))))
|
||
|
||
;; Compute and answer a short option argument, advancing ARGS as
|
||
;; necessary, for the short option whose character is at POSITION
|
||
;; in the current ARG.
|
||
(define (short-option-argument position)
|
||
(cond ((< (1+ position) (string-length (car args)))
|
||
(let ((result (substring (car args) (1+ position))))
|
||
(set! args (cdr args))
|
||
result))
|
||
((pair? (cdr args))
|
||
(let ((result (cadr args)))
|
||
(set! args (cddr args))
|
||
result))
|
||
((pair? args)
|
||
(set! args (cdr args))
|
||
#f)
|
||
(else #f)))
|
||
|
||
;; Interpret the short-option at index POSITION in (car ARGS),
|
||
;; followed by the remaining short options in (car ARGS).
|
||
(define (short-option position)
|
||
(if (>= position (string-length (car args)))
|
||
(begin
|
||
(set! args (cdr args))
|
||
(next-arg))
|
||
(let* ((opt-name (string-ref (car args) position))
|
||
(option-here (hash-ref lookup opt-name)))
|
||
(cond ((not option-here)
|
||
(mutate-seeds! unrecognized-option-proc
|
||
(option (list opt-name) #f #f
|
||
unrecognized-option-proc)
|
||
opt-name #f)
|
||
(short-option (1+ position)))
|
||
(else
|
||
(invoke-option-processor
|
||
option-here opt-name
|
||
(lambda ()
|
||
(or (short-option-argument position)
|
||
(error "Missing required argument after `-~A'" opt-name)))
|
||
(lambda ()
|
||
;; edge case: -xo -zf or -xo -- where opt-name=#\o
|
||
;; GNU getopt_long resolves these like I do
|
||
(short-option-argument position))
|
||
(lambda () #f))
|
||
(if (not (or (option-required-arg? option-here)
|
||
(option-optional-arg? option-here)))
|
||
(short-option (1+ position))))))))
|
||
|
||
;; Process the long option in (car ARGS). We make the
|
||
;; interesting, possibly non-standard assumption that long option
|
||
;; names might contain #\=, so keep looking for more #\= in (car
|
||
;; ARGS) until we find a named option in lookup.
|
||
(define (long-option)
|
||
(let ((arg (car args)))
|
||
(let place-=-after ((start-pos 2))
|
||
(let* ((index (string-index arg #\= start-pos))
|
||
(opt-name (substring arg 2 (or index (string-length arg))))
|
||
(option-here (hash-ref lookup opt-name)))
|
||
(if (not option-here)
|
||
;; look for a later #\=, unless there can't be one
|
||
(if index
|
||
(place-=-after (1+ index))
|
||
(mutate-seeds!
|
||
unrecognized-option-proc
|
||
(option (list opt-name) #f #f unrecognized-option-proc)
|
||
opt-name #f))
|
||
(invoke-option-processor
|
||
option-here opt-name
|
||
(lambda ()
|
||
(if index
|
||
(substring arg (1+ index))
|
||
(error "Missing required argument after `--~A'" opt-name)))
|
||
(lambda () (and index (substring arg (1+ index))))
|
||
(lambda ()
|
||
(if index
|
||
(error "Extraneous argument after `--~A'" opt-name))))))))
|
||
(set! args (cdr args)))
|
||
|
||
;; Process the remaining in ARGS. Basically like calling
|
||
;; `args-fold', but without having to regenerate `lookup' and the
|
||
;; funcs above.
|
||
(define (next-arg)
|
||
(if (null? args)
|
||
(apply values seeds)
|
||
(let ((arg (car args)))
|
||
(cond ((or (not (char=? #\- (string-ref arg 0)))
|
||
(= 1 (string-length arg))) ;"-"
|
||
(mutate-seeds! operand-proc arg)
|
||
(set! args (cdr args)))
|
||
((char=? #\- (string-ref arg 1))
|
||
(if (= 2 (string-length arg)) ;"--"
|
||
(begin (set! args (cdr args)) (rest-operands))
|
||
(long-option)))
|
||
(else (short-option 1)))
|
||
(next-arg))))
|
||
|
||
(next-arg)))
|
||
|
||
;;; srfi-37.scm ends here
|