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;;; ol-info.el --- Links to Info Nodes -*- lexical-binding: t; -*-
;; Copyright (C) 2004-2019 Free Software Foundation, Inc.
;; Author: Carsten Dominik <carsten at orgmode dot org>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: https://orgmode.org
;;
;; This file is part of GNU Emacs.
;;
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;; This file implements links to Info nodes from within Org mode.
;; Org mode loads this module by default - if this is not what you want,
;; configure the variable `org-modules'.
;;; Code:
(require 'ol)
;; Declare external functions and variables
(declare-function Info-find-node "info"
(filename nodename &optional no-going-back strict-case))
(defvar Info-current-file)
(defvar Info-current-node)
;; Install the link type
(org-link-set-parameters "info"
:follow #'org-info-open
:export #'org-info-export
:store #'org-info-store-link)
;; Implementation
(defun org-info-store-link ()
"Store a link to an Info file and node."
(when (eq major-mode 'Info-mode)
(let ((link (concat "info:"
(file-name-nondirectory Info-current-file)
"#" Info-current-node))
(desc (concat (file-name-nondirectory Info-current-file)
"#" Info-current-node)))
(org-link-store-props :type "info" :file Info-current-file
:node Info-current-node
:link link :desc desc)
link)))
(defun org-info-open (path)
"Follow an Info file and node link specified by PATH."
(org-info-follow-link path))
(defun org-info-follow-link (name)
"Follow an Info file and node link specified by NAME."
(if (or (string-match "\\(.*\\)\\(?:#\\|::\\)\\(.*\\)" name)
(string-match "\\(.*\\)" name))
(let ((filename (match-string 1 name))
(nodename-or-index (or (match-string 2 name) "Top")))
(require 'info)
;; If nodename-or-index is invalid node name, then look it up
;; in the index.
(condition-case nil
(Info-find-node filename nodename-or-index)
(user-error (Info-find-node filename "Top")
(condition-case nil
(Info-index nodename-or-index)
(user-error "Could not find '%s' node or index entry"
nodename-or-index)))))
(user-error "Could not open: %s" name)))
(defconst org-info-emacs-documents
'("ada-mode" "auth" "autotype" "bovine" "calc" "ccmode" "cl" "dbus" "dired-x"
"ebrowse" "ede" "ediff" "edt" "efaq-w32" "efaq" "eieio" "eintr" "elisp"
"emacs-gnutls" "emacs-mime" "emacs" "epa" "erc" "ert" "eshell" "eudc" "eww"
"flymake" "forms" "gnus" "htmlfontify" "idlwave" "ido" "info" "mairix-el"
"message" "mh-e" "newsticker" "nxml-mode" "octave-mode" "org" "pcl-cvs"
"pgg" "rcirc" "reftex" "remember" "sasl" "sc" "semantic" "ses" "sieve"
"smtpmail" "speedbar" "srecode" "todo-mode" "tramp" "url" "vip" "viper"
"widget" "wisent" "woman")
"List of emacs documents available.
Taken from <https://www.gnu.org/software/emacs/manual/html_mono/.>")
(defconst org-info-other-documents
'(("libc" . "https://www.gnu.org/software/libc/manual/html_mono/libc.html")
("make" . "https://www.gnu.org/software/make/manual/make.html"))
"Alist of documents generated from Texinfo source.
When converting info links to HTML, links to any one of these manuals are
converted to use these URL.")
(defun org-info-map-html-url (filename)
"Return URL or HTML file associated to Info FILENAME.
If FILENAME refers to an official GNU document, return a URL pointing to
the official page for that document, e.g., use \"gnu.org\" for all Emacs
related documents. Otherwise, append \".html\" extension to FILENAME.
See `org-info-emacs-documents' and `org-info-other-documents' for details."
(cond ((member filename org-info-emacs-documents)
(format "https://www.gnu.org/software/emacs/manual/html_mono/%s.html"
filename))
((cdr (assoc filename org-info-other-documents)))
(t (concat filename ".html"))))
(defun org-info--expand-node-name (node)
"Expand Info NODE to HTML cross reference."
;; See (info "(texinfo) HTML Xref Node Name Expansion") for the
;; expansion rule.
(let ((node (replace-regexp-in-string
"\\([ \t\n\r]+\\)\\|\\([^a-zA-Z0-9]\\)"
(lambda (m)
(if (match-end 1) "-" (format "_%04x" (string-to-char m))))
(org-trim node))))
(cond ((string= node "") "")
((string-match-p "\\`[0-9]" node) (concat "g_t" node))
(t node))))
(defun org-info-export (path desc format)
"Export an info link.
See `org-link-parameters' for details about PATH, DESC and FORMAT."
(let* ((parts (split-string path "#\\|::"))
(manual (car parts))
(node (or (nth 1 parts) "Top")))
(pcase format
(`html
(format "<a href=\"%s#%s\">%s</a>"
(org-info-map-html-url manual)
(org-info--expand-node-name node)
(or desc path)))
(`texinfo
(let ((title (or desc "")))
(format "@ref{%s,%s,,%s,}" node title manual)))
(_ nil))))
(provide 'ol-info)
;;; ol-info.el ends here
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