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;;; Copyright © 2021 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; This program is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; This program 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;;; Commentary:
;;;
;;; This script extracts docstrings from a module and spits out a
;;; TexInfo file.
;;;
;;;; Code:
(use-modules (ice-9 match)
(ice-9 session))
(define (arguments->string proc)
(match (procedure-arguments proc)
((('required . req-names)
('optional . opt-names)
('keyword . kw-names)
('allow-other-keys? . any)
('rest . rest))
(string-join
(list
(format #false "~{@var{~a}~^ ~}" req-names)
(format #false "~:[[~{@var{~a}~^ ~}]~;~]" (null? opt-names) opt-names)
(format #false "~:[[~{@var{~a}~^ ~}]~;~]" (null? kw-names) (map car kw-names))
(format #false "~@[@var{~a} ...~]" rest))))))
(define (fancy-docstring proc known-procedures)
(define arguments
(match (procedure-arguments proc)
((('required . req-names)
('optional . opt-names)
('keyword . kw-names)
('allow-other-keys? . any)
('rest . rest))
(let ((kws (map (compose keyword->symbol car)
kw-names)))
(map symbol->string
(append req-names opt-names kws
(if rest (list rest) '())))))))
(define (argument? word)
(member (string-downcase word) arguments))
(define* (maybe-wrap word #:optional (trail ""))
(let ((word* (string-drop-right word (string-length trail))))
(if (or (member word* '("#TRUE" "#FALSE" "*"))
(member word* known-procedures)
(argument? word*))
(string-append "@var{" (string-downcase word*) "}" trail)
(string-append word* trail))))
(let ((words (string-tokenize (procedure-documentation proc))))
(string-join (map (lambda (word)
(cond
((string-suffix? "." word)
(maybe-wrap word "."))
((string-suffix? "," word)
(maybe-wrap word ","))
((string-suffix? ";" word)
(maybe-wrap word ";"))
(else
(maybe-wrap word))))
words))))
(define (docs module)
(define known-procedures
(module-map (lambda (sym var)
(string-upcase (symbol->string sym)))
(resolve-interface module)))
(let ((unsorted
(filter identity
(module-map
(lambda (sym var)
(false-if-exception
(let ((proc (variable-ref var)))
(cons sym (format #false
"\
@cindex ~a
@deffn {Scheme Procedure} ~a ~a
~a
@end deffn
" sym sym
(arguments->string proc)
(fancy-docstring proc known-procedures))))))
(resolve-interface module)))))
(sort unsorted (lambda (a b)
(string< (symbol->string (car a))
(symbol->string (car b)))))))
(define (main . args)
(match (command-line)
((_ module file)
(let ((directory (dirname file)))
(unless (file-exists? directory)
(mkdir directory)))
(with-output-to-file file
(lambda ()
(for-each (match-lambda
((sym . doc)
(display doc)
(newline)))
(docs (call-with-input-string module read))))))))
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