;;; w3m-perldoc.el --- The add-on program to view Perl documents.

;; Copyright (C) 2001 TSUCHIYA Masatoshi <tsuchiya@namazu.org>

;; Author: TSUCHIYA Masatoshi <tsuchiya@namazu.org>
;; Keywords: w3m, perldoc

;; This file is a part of emacs-w3m.

;; 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 2, 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, you can either send email to this
;; program's maintainer or write to: The Free Software Foundation,
;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.


;;; Commentary:

;; w3m-perldoc.el is the add-on program of emacs-w3m to view Perl
;; documents.  For more detail about emacs-w3m, see:
;;
;;    http://emacs-w3m.namazu.org/

;;; Code:
(require 'w3m)

(defgroup w3m-perldoc nil
  "Perldoc front-end for emacs-w3m."
  :group 'w3m
  :prefix "w3m-perldoc-")

(defcustom w3m-perldoc-command "perldoc"
  "*Name of the executable file of perldoc."
  :group 'w3m-perldoc
  :type 'string)

(defcustom w3m-perldoc-pod2html-command "pod2html"
  "*Name of the executable file of pod2html."
  :group 'w3m-perldoc
  :type 'string)

(defcustom w3m-perldoc-pod2html-arguments
  '("--noindex")
  "*Arguments of pod2html."
  :group 'w3m-perldoc
  :type '(repeat string))

;;;###autoload
(defun w3m-about-perldoc (url &optional no-decode no-cache &rest args)
  (when (string-match "\\`about://perldoc/" url)
    (let ((docname (if (= (length url) (match-end 0))
		       "perl"
		     (w3m-url-decode-string (substring url (match-end 0)))))
	  (default-directory w3m-profile-directory)
	  (process-environment (copy-sequence process-environment)))
      ;; To specify the place in which pod2html generates its cache files.
      (setenv "HOME" (expand-file-name w3m-profile-directory))
      (and (zerop (call-process w3m-perldoc-command
				nil t nil "-u" docname))
	   (zerop (apply (function call-process-region)
			 (point-min) (point-max)
			 w3m-perldoc-pod2html-command
			 t '(t nil) nil
			 (append w3m-perldoc-pod2html-arguments
				 '("--htmlroot=about://perldoc"))))
	   (let ((case-fold-search t))
	     (goto-char (point-min))
	     (while (re-search-forward
		     "<a href=\"about://perldoc/\\([^\"]*\\)\\(\\.html\\)\">" nil t)
	       (delete-region (match-beginning 2) (match-end 2))
	       (save-restriction
		 (narrow-to-region (match-beginning 1) (match-end 1))
		 (while (search-backward "/" nil t)
		   (delete-char 1)
		   (insert "::"))
		 (goto-char (point-max))))
	     "text/html")))))

;;;###autoload
(defun w3m-perldoc (docname)
  "View Perl documents."
  (interactive "sDocument: ")
  (w3m-goto-url (concat "about://perldoc/" (w3m-url-encode-string docname))))

(provide 'w3m-perldoc)

;;; w3m-perldoc.el ends here.