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-;;; 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