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Re: [O] patch for HTML links to GNU documents

From: Richard Y. Kim
Subject: Re: [O] patch for HTML links to GNU documents
Date: Mon, 28 Mar 2016 22:24:41 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.92 (gnu/linux)

Nicolas Goaziou <address@hidden> writes:

> Hello,
> Richard Kim <address@hidden> writes:
>> Attached patch affects how 'info' links in org mode are converted to HTML
>> links.  Today info links such as
>>     [[info:emacs#List Buffers]]
>> are converted to this HTML link:
>>     <a href="emacs.html#List-Buffers">emacs#List Buffers</a>
>> With the patch applied, the HTML link generated would be
>>     <a href="
>> http://www.gnu.org/software/emacs/manual/html_mono/emacs.html#List-Buffers";>emacs#List
>> Buffers</a>
> Thank you. Some comments follow.
>> +(defvar org-info-emacs-documents
> I suggest to use `defconst' instead, since you're not modifying or
> let-binding the variable whatsoever.
>> +  '("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 at the official URL
>> +<http://www.gnu.org/software/emacs/manual/html_mono/.>")
> The first sentence in the docstring is expected to be on a single line,
> e.g.
>   "List of emacs documents available.
>   Taken from <http://www.gnu.org/software/emacs/manual/html_mono/.>"
>> +(defvar org-info-other-documents
> `defconst'
> Could you also write an entry about it in ORG-NEWS?


I made all the changes that you suggested in the attached patch.
Please let me know if further changes are needed.

I mailed in my signed licensing paper for emacs to FSF today, so that it
FSF should get it later this week.

>From 20adf43716f602e0c4be1a427bf8c6afd5e44c7e Mon Sep 17 00:00:00 2001
From: Richard Kim <address@hidden>
Date: Thu, 10 Mar 2016 06:29:48 -0800
Subject: [PATCH] org-info.el: generate HTML links to gnu.org

* lisp/org-info.el (org-info-export): Convert info links to HTML URL's
that point to appropriate gnu.org or other pages.  User's can customize
the behavior using `org-info-emacs-documents' and
`org-info-other-documets' new variables.

 etc/ORG-NEWS     | 14 ++++++++++++++
 lisp/org-info.el | 35 +++++++++++++++++++++++++++++++++--
 2 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 4e6c7cb..3ddc3f9 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -317,6 +317,20 @@ called with 6 parameters.
 *** =ITEM= special property returns headline without stars
 *** Rename ~org-insert-columns-dblock~ into ~org-columns-insert-dblock~
 The previous name is, for the time being, kept as an obsolete alias.
+*** Function ~org-info-export~ changes.
+HTML links created from certain info links now point to =gnu.org= URL's rather
+than just to local files. For example info links such as =info:emacs#List
+Buffers= used to be converted to HTML links like this:
+: <a href="emacs.html#List-Buffers">emacs#List Buffers</a>
+where local file =emacs.html= is referenced.
+For most folks this file does not exist.
+Thus the new behavior is to generate this HTML link instead:
+: <a 
+All emacs related info links are similarly translated plus few other =gnu.org= 
 * Version 8.3
 ** Incompatible changes
diff --git a/lisp/org-info.el b/lisp/org-info.el
index 270c19f..07693fe 100644
--- a/lisp/org-info.el
+++ b/lisp/org-info.el
@@ -81,6 +81,37 @@
     (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 <http://www.gnu.org/software/emacs/manual/html_mono/.>")
+(defconst org-info-other-documents
+  '(("libc" . "http://www.gnu.org/software/libc/manual/html_mono/libc.html";)
+    ("make" . "http://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's.")
+(defun org-info-map-html-url (filename)
+  "Given info FILENAME, either return it (plus '.html' suffix added) or convert
+it to URL pointing to the official page on internet, e.g., use gnu.org for all
+emacs related documents. See `org-info-official-gnu-document' and
+`org-info-other-documents' for details."
+  (if (member filename org-info-emacs-documents)
+      (format "http://www.gnu.org/software/emacs/manual/html_mono/%s.html";
+              filename)
+    (let ((url (cdr (assoc filename org-info-other-documents))))
+      (or url (concat filename ".html")))))
 (defun org-info-export (path desc format)
   "Export an info link.
 See `org-add-link-type' for details about PATH, DESC and FORMAT."
@@ -89,8 +120,8 @@ See `org-add-link-type' for details about PATH, DESC and 
        (string-match "\\(.*\\)" path))
     (let ((filename (match-string 1 path))
          (node (or (match-string 2 path) "Top")))
-      (format "<a href=\"%s.html#%s\">%s</a>"
-             filename
+      (format "<a href=\"%s#%s\">%s</a>"
+             (org-info-map-html-url filename)
              (replace-regexp-in-string " " "-" node)
              (or desc path)))))

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