Re: [Feature] add a new org-attach dispatcher command to offline save web page

[stardiviner <numbchild@gmail.com>]

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Bastien <bzg@gnu.org> writes:

> Hi Stardiviner,
>
> stardiviner <numbchild@gmail.com> writes:
>
>> I think maybe Org maintainer can improve the org-attach code to suitable to add
>> custom function. 
>
> Sorry, I don't understand.
>
> Can you to use M-x customize-option RET org-attach-commands RET then
> add a custom command pointing to the command you have written, bound
> to a keybinding of your choice?
>
> If something does not work with this approach, can you show me what
> you tried and what does not work?

Here is my patch, I try to annotate on my patch code to express my words:

#+begin_src diff
- From 6c667461b45e93059c6f801e485f7da4bfc3606c Mon Sep 17 00:00:00 2001
From: stardiviner <numbchild@gmail.com>
Subject: [PATCH] * org-attach.el: add a new command to archive web page

,* lisp/org-attach.el (org-attach-url-archive): A new org-attach
dispatcher command to archive web page to a single file.

,* lisp/org-agenda.el (org-attach-url-archive-command): A customize
option to specify external command for archiving web page.

,* lisp/org-attach.el (org-attach-url-archive-page): A command
invoke external command to offline archive save web page.
- ---
 lisp/org-attach.el | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/lisp/org-attach.el b/lisp/org-attach.el
index 57d1360fc..80855d147 100644
- --- a/lisp/org-attach.el
+++ b/lisp/org-attach.el
@@ -204,6 +204,8 @@ (defcustom org-attach-commands
      "Attach a file using symbolic-link method.")
     ((?u ?\C-u) org-attach-url
      "Attach a file from URL (downloading it).")
+    ((?U) org-attach-url-archive
+     "Attach an offline version of web page URL.")             <----- This `org-attach-commands' is an option which indeead can be customized.
     ((?b) org-attach-buffer
      "Select a buffer and attach its contents to the task.")
     ((?n ?\C-n) org-attach-new
@@ -467,6 +469,31 @@ (defun org-attach-url (url)
   (let ((org-attach-method 'url))
     (org-attach-attach url)))
 
+(defun org-attach-url-archive (url)                            <-----------------+
+  (interactive "MURL of the web page be archived to attach: \n")                 |
+  (let ((org-attach-method 'archive))                                            |
+    (org-attach-attach url)))                                                    |
+                                                                                 |
+(defcustom org-attach-url-archive-command                                        |  You can see, all those function code can be put in user configuration. Yes.
+  (file-name-nondirectory (executable-find "monolith"))                          |
+  "The command used to offline archive web page.                                 |
+monolith can be found here: https://github.com/Y2Z/monolith."                    |
+  :type 'string                                                                  |
+  :safe #'stringp                                                                |
+  :group 'org-attach)                                                            |
+                                                                                 |
+(defun org-attach-url-archive-page (url target-file)                             |
+  "Save an offline archive of web page."                                         |
+  (pcase org-attach-url-archive-command                                          |
+    ("monolith"                                                                  |
+     (make-process                                                               |
+      :name "org-attach-offline"                                                 |
+      :command (list org-attach-url-archive-command url "-o" target-file)        |
+      :sentinel (lambda (proc event) (message "org-attach-offline finished!"))   |
+      :buffer "*org-attach-url-archive*"))                                       |
+    (nil (warn "You must have a command availble for offline save web page!      |
+Set variable `org-attach-url-archive-command'."))))               <--------------+
+
 (defun org-attach-buffer (buffer-name)
   "Attach BUFFER-NAME's contents to current outline node.
 BUFFER-NAME is a string.  Signals a `file-already-exists' error
@@ -504,7 +531,8 @@ (defun org-attach-attach (file &optional visit-dir method)
        ((eq method 'cp) (copy-file file attach-file))
        ((eq method 'ln) (add-name-to-file file attach-file))
        ((eq method 'lns) (make-symbolic-link file attach-file))
- -       ((eq method 'url) (url-copy-file file attach-file)))
+       ((eq method 'url) (url-copy-file file attach-file))        <-------------- But this can't be don'e through advice or something else. Unless copy whole function code.
+       ((eq method 'archive) (org-attach-url-archive-page file attach-file)))     In my less elisp knowledge, I don't have any idea how to add a new org-attach method in `org-attach-attach'.
       (run-hook-with-args 'org-attach-after-change-hook attach-dir)               Maybe you have better idea. I might consider publish this as a tiny Emacs extension.
       (org-attach-tag)
       (cond ((eq org-attach-store-link-p 'attached)
- -- 
2.26.2
#+end_src

- -- 
[ stardiviner ]
       I try to make every word tell the meaning that I want to express.

       Blog: https://stardiviner.github.io/
       IRC(freenode): stardiviner, Matrix: stardiviner
       GPG: F09F650D7D674819892591401B5DF1C95AE89AC3
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