FM / ice-9

/usr/share/guile/2.0/ice-9

Name	Size	Mode	Actions
and-let-star.scm	2593	0644	edit dl rm
binary-ports.scm	1921	0644	edit dl rm
boot-9.scm	154720	0644	edit dl rm
buffered-input.scm	4935	0644	edit dl rm
calling.scm	10790	0644	edit dl rm
channel.scm	5312	0644	edit dl rm
command-line.scm	18655	0644	edit dl rm
common-list.scm	9160	0644	edit dl rm
control.scm	4036	0644	edit dl rm
curried-definitions.scm	1829	0644	edit dl rm
debug.scm	1114	0644	edit dl rm
deprecated.scm	31993	0644	edit dl rm
documentation.scm	7432	0644	edit dl rm
eval-string.scm	2997	0644	edit dl rm
eval.scm	21354	0644	edit dl rm
expect.scm	5628	0644	edit dl rm
format.scm	76284	0644	edit dl rm
ftw.scm	24753	0644	edit dl rm
futures.scm	11186	0644	edit dl rm
gap-buffer.scm	10384	0644	edit dl rm
getopt-long.scm	16888	0644	edit dl rm
hash-table.scm	1813	0644	edit dl rm
hcons.scm	2614	0644	edit dl rm
history.scm	2343	0644	edit dl rm
i18n.scm	17778	0644	edit dl rm
iconv.scm	3735	0644	edit dl rm
lineio.scm	3941	0644	edit dl rm
list.scm	1319	0644	edit dl rm
local-eval.scm	9946	0644	edit dl rm
ls.scm	3275	0644	edit dl rm
mapping.scm	4955	0644	edit dl rm
match.scm	2045	0644	edit dl rm
match.upstream.scm	36459	0644	edit dl rm
networking.scm	3407	0644	edit dl rm
null.scm	1157	0644	edit dl rm
occam-channel.scm	7436	0644	edit dl rm
optargs.scm	16123	0644	edit dl rm
poe.scm	3382	0644	edit dl rm
poll.scm	6166	0644	edit dl rm
popen.scm	5806	0644	edit dl rm
posix.scm	2793	0644	edit dl rm
pretty-print.scm	16211	0644	edit dl rm
psyntax-pp.scm	166774	0644	edit dl rm
psyntax.scm	147118	0644	edit dl rm
q.scm	4297	0644	edit dl rm
quasisyntax.scm	5348	0644	edit dl rm
r4rs.scm	9645	0644	edit dl rm
r5rs.scm	1602	0644	edit dl rm
r6rs-libraries.scm	9164	0644	edit dl rm
rdelim.scm	7648	0644	edit dl rm
readline.scm	9786	0644	edit dl rm
receive.scm	1082	0644	edit dl rm
regex.scm	9084	0644	edit dl rm
runq.scm	8379	0644	edit dl rm
rw.scm	1047	0644	edit dl rm
safe-r5rs.scm	3814	0644	edit dl rm
safe.scm	1275	0644	edit dl rm
save-stack.scm	2197	0644	edit dl rm
scm-style-repl.scm	11986	0644	edit dl rm
serialize.scm	3859	0644	edit dl rm
session.scm	18143	0644	edit dl rm
slib.scm	1583	0644	edit dl rm
stack-catch.scm	1983	0644	edit dl rm
streams.scm	7488	0644	edit dl rm
string-fun.scm	8798	0644	edit dl rm
syncase.scm	1556	0644	edit dl rm
threads.scm	6388	0644	edit dl rm
time.scm	2088	0644	edit dl rm
top-repl.scm	2812	0644	edit dl rm
unicode.scm	1005	0644	edit dl rm
vlist.scm	22081	0644	edit dl rm
weak-vector.scm	1288	0644	edit dl rm

Edit: /usr/share/guile/2.0/ice-9/session.scm (18143B)

;;;; Copyright (C) 1997, 2000, 2001, 2003, 2006, 2009, 2010, 2011,
;;;;    2012 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
;;;;

(define-module (ice-9 session)
  #:use-module (ice-9 documentation)
  #:use-module (ice-9 regex)
  #:use-module (ice-9 rdelim)
  #:use-module (ice-9 match)
  #:export (help
            add-value-help-handler! remove-value-help-handler!
            add-name-help-handler! remove-name-help-handler!
            apropos-hook
            apropos apropos-internal apropos-fold apropos-fold-accessible
            apropos-fold-exported apropos-fold-all source arity
            procedure-arguments
            module-commentary))

(define *value-help-handlers*
  `(,(lambda (name value)
       (object-documentation value))))

(define (add-value-help-handler! proc)
  "Adds a handler for performing `help' on a value.

`proc' will be called as (PROC NAME VALUE). `proc' should return #t to
indicate that it has performed help, a string to override the default
object documentation, or #f to try the other handlers, potentially
falling back on the normal behavior for `help'."
  (set! *value-help-handlers* (cons proc *value-help-handlers*)))

(define (remove-value-help-handler! proc)
  "Removes a handler for performing `help' on a value."
  (set! *value-help-handlers* (delete! proc *value-help-handlers*)))

(define (try-value-help name value)
  (or-map (lambda (proc) (proc name value)) *value-help-handlers*))

(define *name-help-handlers* '())

(define (add-name-help-handler! proc)
  "Adds a handler for performing `help' on a name.

`proc' will be called with the unevaluated name as its argument. That is
to say, when the user calls `(help FOO)', the name is FOO, exactly as
the user types it.

`proc' should return #t to indicate that it has performed help, a string
to override the default object documentation, or #f to try the other
handlers, potentially falling back on the normal behavior for `help'."
  (set! *name-help-handlers* (cons proc *name-help-handlers*)))

(define (remove-name-help-handler! proc)
  "Removes a handler for performing `help' on a name."
  (set! *name-help-handlers* (delete! proc *name-help-handlers*)))

(define (try-name-help name)
  (or-map (lambda (proc) (proc name)) *name-help-handlers*))

;;; Documentation
;;;
(define-macro (help . exp)
  "(help [NAME])
Prints useful information.  Try `(help)'."
  (cond ((not (= (length exp) 1))
         (help-usage)
         '(begin))
        ((not (provided? 'regex))
         (display "`help' depends on the `regex' feature.
You don't seem to have regular expressions installed.\n")
         '(begin))
        (else
         (let ((name (car exp))
               (not-found (lambda (type x)
                            (simple-format #t "No ~A found for ~A\n"
                                           type x))))
           (cond
            
            ;; User-specified
            ((try-name-help name)
             => (lambda (x) (if (not (eq? x #t)) (display x))))

;; SYMBOL
            ((symbol? name)
             (help-doc name
                       (simple-format
                        #f "^~A$"
                        (regexp-quote (symbol->string name)))))
            
            ;; "STRING"
            ((string? name)
             (help-doc name name))

;; (unquote SYMBOL)
            ((and (list? name)
                  (= (length name) 2)
                  (eq? (car name) 'unquote))
             (let ((doc (try-value-help (cadr name)
                                        (module-ref (current-module)
                                                    (cadr name)))))
               (cond ((not doc) (not-found 'documentation (cadr name)))
                     ((eq? doc #t)) ;; pass
                     (else (write-line doc)))))

;; (quote SYMBOL)
            ((and (list? name)
                  (= (length name) 2)
                  (eq? (car name) 'quote)
                  (symbol? (cadr name)))
             (cond ((search-documentation-files (cadr name))
                    => write-line)
                   (else (not-found 'documentation (cadr name)))))

;; (SYM1 SYM2 ...)
            ((and (list? name)
                  (and-map symbol? name)
                  (not (null? name))
                  (not (eq? (car name) 'quote)))
             (cond ((module-commentary name)
                    => (lambda (doc)
                         (display name) (write-line " commentary:")
                         (write-line doc)))
                   (else (not-found 'commentary name))))

;; unrecognized
            (else
             (help-usage)))
           '(begin)))))

(define (module-filename name)          ; fixme: better way? / done elsewhere?
  (let* ((name (map symbol->string name))
         (reverse-name (reverse name))
	 (leaf (car reverse-name))
	 (dir-hint-module-name (reverse (cdr reverse-name)))
	 (dir-hint (apply string-append
                          (map (lambda (elt)
                                 (string-append elt "/"))
                               dir-hint-module-name))))
    (%search-load-path (in-vicinity dir-hint leaf))))

(define (module-commentary name)
  (cond ((module-filename name) => file-commentary)
        (else #f)))

(define (help-doc term regexp)
  (let ((entries (apropos-fold (lambda (module name object data)
				 (cons (list module
					     name
					     (try-value-help name object)
					     (cond ((procedure? object)
						    "a procedure")
						   (else
						    "an object")))
				       data))
			       '()
			       regexp
			       apropos-fold-exported))
	(module car)
	(name cadr)
	(doc caddr)
	(type cadddr))
    (cond ((not (null? entries))
           (let ((first? #t)
                 (undocumented-entries '())
                 (documented-entries '())
                 (documentations '()))

(for-each (lambda (entry)
                         (let ((entry-summary (simple-format
                                               #f "~S: ~S\n"
                                               (module-name (module entry))
                                               (name entry))))
                           (if (doc entry)
                               (begin
                                 (set! documented-entries
                                       (cons entry-summary documented-entries))
                                 ;; *fixme*: Use `describe' when we have GOOPS?
                                 (set! documentations
                                       (cons (simple-format
                                              #f "`~S' is ~A in the ~S module.\n\n~A\n"
                                              (name entry)
                                              (type entry)
                                              (module-name (module entry))
                                              (doc entry))
                                             documentations)))
                               (set! undocumented-entries
                                     (cons entry-summary
                                           undocumented-entries)))))
                       entries)

(if (and (not (null? documented-entries))
                      (or (> (length documented-entries) 1)
                          (not (null? undocumented-entries))))
                 (begin
                   (display "Documentation found for:\n")
                   (for-each (lambda (entry) (display entry))
                             documented-entries)
                   (set! first? #f)))

(for-each (lambda (entry)
                         (if first?
                             (set! first? #f)
                             (newline))
                         (display entry))
                       documentations)

(if (not (null? undocumented-entries))
                 (begin
                   (if first?
                       (set! first? #f)
                       (newline))
                   (display "No documentation found for:\n")
                   (for-each (lambda (entry) (display entry))
                             undocumented-entries)))))
          ((search-documentation-files term)
           => (lambda (doc)
                (write-line "Documentation from file:")
                (write-line doc)))
          (else
           ;; no matches
           (display "Did not find any object ")
           (simple-format #t
                          (if (symbol? term)
                              "named `~A'\n"
                              "matching regexp \"~A\"\n")
                          term)))))

(define (help-usage)
  (display "Usage: (help NAME) gives documentation about objects named NAME (a symbol)
       (help REGEXP) ditto for objects with names matching REGEXP (a string)
       (help 'NAME) gives documentation for NAME, even if it is not an object
       (help ,EXPR) gives documentation for object returned by EXPR
       (help (my module)) gives module commentary for `(my module)'
       (help) gives this text

`help' searches among bindings exported from loaded modules, while
`apropos' searches among bindings visible from the \"current\" module.

Examples: (help help)
          (help cons)
          (help \"output-string\")

Other useful sources of helpful information:

(apropos STRING)
(arity PROCEDURE)
(name PROCEDURE-OR-MACRO)
(source PROCEDURE-OR-MACRO)

Tools:

(backtrace)				;show backtrace from last error
(debug)					;enter the debugger
(trace [PROCEDURE])			;trace procedure (no arg => show)
(untrace [PROCEDURE])			;untrace (no arg => untrace all)

(OPTIONSET-options 'full)		;display option information
(OPTIONSET-enable 'OPTION)
(OPTIONSET-disable 'OPTION)
(OPTIONSET-set! OPTION VALUE)

where OPTIONSET is one of debug, read, eval, print

"))

;;; {Apropos}
;;;
;;; Author: Roland Orre <orre@nada.kth.se>
;;;

;; Two arguments: the module, and the pattern, as a string.
;;
(define apropos-hook (make-hook 2))

(define (apropos rgx . options)
  "Search for bindings: apropos regexp {options= 'full 'shadow 'value}"
  (run-hook apropos-hook (current-module) rgx)
  (if (zero? (string-length rgx))
      "Empty string not allowed"
      (let* ((match (make-regexp rgx))
	     (uses (module-uses (current-module)))
	     (modules (cons (current-module)
			    (if (and (not (null? uses))
				     (eq? (module-name (car uses))
					  'duplicates))
				(cdr uses)
				uses)))
	     (separator #\tab)
	     (shadow (member 'shadow options))
	     (value (member 'value options)))
	(cond ((member 'full options)
	       (set! shadow #t)
	       (set! value #t)))
	(for-each
	 (lambda (module)
	   (let* ((name (module-name module))
		  (obarray (module-obarray module)))
	     ;; XXX - should use hash-fold here
	     (hash-for-each
	      (lambda (symbol variable)
		(cond ((regexp-exec match (symbol->string symbol))
		       (display name)
		       (display ": ")
		       (display symbol)
		       (cond ((variable-bound? variable)
			      (let ((val (variable-ref variable)))
				(cond ((or (procedure? val) value)
				       (display separator)
				       (display val)))))
			     (else
			      (display separator)
			      (display "(unbound)")))
		       (if (and shadow
				(not (eq? (module-ref module symbol)
					  (module-ref (current-module) symbol))))
			   (display " shadowed"))
		       (newline))))
	      obarray)))
	 modules))))

(define (apropos-internal rgx)
  "Return a list of accessible variable names."
  (apropos-fold (lambda (module name var data)
		  (cons name data))
		'()
		rgx
		(apropos-fold-accessible (current-module))))

(define (apropos-fold proc init rgx folder)
  "Folds PROCEDURE over bindings matching third arg REGEXP.

Result is

(PROCEDURE MODULE1 NAME1 VALUE1
    (PROCEDURE MODULE2 NAME2 VALUE2
      ...
      (PROCEDURE MODULEn NAMEn VALUEn INIT)))

where INIT is the second arg to `apropos-fold'.

Fourth arg FOLDER is one of

(apropos-fold-accessible MODULE) ;fold over bindings accessible in MODULE
  apropos-fold-exported		   ;fold over all exported bindings
  apropos-fold-all		   ;fold over all bindings"
  (run-hook apropos-hook (current-module) rgx)
  (let ((match (make-regexp rgx))
	(recorded (make-hash-table)))
    (let ((fold-module
	   (lambda (module data)
	     (let* ((obarray-filter
		     (lambda (name val data)
		       (if (and (regexp-exec match (symbol->string name))
				(not (hashq-get-handle recorded name)))
			   (begin
			     (hashq-set! recorded name #t)
			     (proc module name val data))
			   data)))
		    (module-filter
		     (lambda (name var data)
		       (if (variable-bound? var)
			   (obarray-filter name (variable-ref var) data)
			   data))))
	       (cond (module (hash-fold module-filter
					data
					(module-obarray module)))
		     (else data))))))
      (folder fold-module init))))

(define (make-fold-modules init-thunk traverse extract)
  "Return procedure capable of traversing a forest of modules.
The forest traversed is the image of the forest generated by root
modules returned by INIT-THUNK and the generator TRAVERSE.
It is an image under the mapping EXTRACT."
  (lambda (fold-module init)
    (let* ((table (make-hash-table 31))
	   (first? (lambda (obj)
		     (let* ((handle (hash-create-handle! table obj #t))
			    (first? (cdr handle)))
		       (set-cdr! handle #f)
		       first?))))
      (let rec ((data init)
		(modules (init-thunk)))
	(do ((modules modules (cdr modules))
	     (data data (if (first? (car modules))
			    (rec (fold-module (extract (car modules)) data)
				 (traverse (car modules)))
			    data)))
	    ((null? modules) data))))))

(define (apropos-fold-accessible module)
  (make-fold-modules (lambda () (list module))
		     module-uses
		     identity))

(define (root-modules)
  (submodules (resolve-module '() #f)))

(define (submodules mod)
  (hash-map->list (lambda (k v) v) (module-submodules mod)))

(define apropos-fold-exported
  (make-fold-modules root-modules submodules module-public-interface))

(define apropos-fold-all
  (make-fold-modules root-modules submodules identity))

(define (source obj)
  (cond ((procedure? obj) (procedure-source obj))
	((macro? obj) (procedure-source (macro-transformer obj)))
	(else #f)))

(define (arity obj)
  (define (display-arg-list arg-list)
    (display #\`)
    (display (car arg-list))
    (let loop ((ls (cdr arg-list)))
      (cond ((null? ls)
	     (display #\'))
	    ((not (pair? ls))
	     (display "', the rest in `")
	     (display ls)
	     (display #\'))
	    (else
	     (if (pair? (cdr ls))
		 (display "', `")
		 (display "' and `"))
	     (display (car ls))
	     (loop (cdr ls))))))
  (define (display-arg-list/summary arg-list type)
    (let ((len (length arg-list)))
      (display len)
      (display " ")
      (display type)
      (if (> len 1)
	  (display " arguments: ")
	  (display " argument: "))
      (display-arg-list arg-list)))
  (cond
   ((procedure-property obj 'arglist)
    => (lambda (arglist)
	 (let ((required-args (car arglist))
	       (optional-args (cadr arglist))
	       (keyword-args (caddr arglist))
	       (allow-other-keys? (cadddr arglist))
	       (rest-arg (car (cddddr arglist)))
	       (need-punctuation #f))
	   (cond ((not (null? required-args))
		  (display-arg-list/summary required-args "required")
		  (set! need-punctuation #t)))
	   (cond ((not (null? optional-args))
		  (if need-punctuation (display ", "))
		  (display-arg-list/summary optional-args "optional")
		  (set! need-punctuation #t)))
	   (cond ((not (null? keyword-args))
		  (if need-punctuation (display ", "))
		  (display-arg-list/summary keyword-args "keyword")
		  (set! need-punctuation #t)))
	   (cond (allow-other-keys?
		  (if need-punctuation (display ", "))
		  (display "other keywords allowed")
		  (set! need-punctuation #t)))
	   (cond (rest-arg
		  (if need-punctuation (display ", "))
		  (display "the rest in `")
		  (display rest-arg)
		  (display "'"))))))
   (else
    (let ((arity (procedure-minimum-arity obj)))
      (display (car arity))
      (cond ((caddr arity)
	     (display " or more"))
	    ((not (zero? (cadr arity)))
	     (display " required and ")
	     (display (cadr arity))
	     (display " optional")))
      (if (and (not (caddr arity))
	       (= (car arity) 1)
	       (<= (cadr arity) 1))
	  (display " argument")
	  (display " arguments")))))
  (display ".\n"))

(define (procedure-arguments proc)
  "Return an alist describing the arguments that `proc' accepts, or `#f'
if the information cannot be obtained.

The alist keys that are currently defined are `required', `optional',
`keyword', `allow-other-keys?', and `rest'."
  (cond
   ((procedure-property proc 'arglist)
    => (match-lambda
        ((req opt keyword aok? rest)
         `((required . ,(if (number? req)
                            (make-list req '_)
                            req))
           (optional . ,(if (number? opt)
                            (make-list opt '_)
                            opt))
           (keyword . ,keyword)
           (allow-other-keys? . ,aok?)
           (rest . ,rest)))))
   ((procedure-source proc)
    => cadr)
   (((@ (system vm program) program?) proc)
    ((@ (system vm program) program-arguments-alist) proc))
   (else #f)))

;;; session.scm ends here

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