Expand notes on lists.gnu.org ↔ message-id mappings

- move function to correct section, and tweak it

- add function for retrieving a lists.gnu.org URL from a
  message-id (unfinished, would like to automatically grab the
  list-id)

- remove indentation; pandoc sees how the #+begin_src tag is indented
  and does TRT

- say "emacs-lisp" instead of "elisp", as pandoc does not know the
  latter
  https://github.com/jgm/pandoc/blob/2.11.2/src/Text/Pandoc/Readers/Org/Shared.hs#L71

1 files changed, 52 insertions, 21 deletions

diff --git a/itches/emacs/development.org b/itches/emacs/development.org
index a3e05da..755330b 100644
--- a/itches/emacs/development.org
+++ b/itches/emacs/development.org
@@ -35,35 +35,66 @@ trick, e.g.
 * Mailing lists
 ** Message IDs
 *** Summary buffer → Message-ID
-#+begin_src elisp
+#+begin_src emacs-lisp
 (kill-new (mail-header-message-id (gnus-summary-article-header)))
 #+end_src
 *** TODO Message-ID → HTTP archive
 - <https://lists.gnu.org>:
   #+begin_example
-  https://lists.gnu.org/archive/cgi-bin/namazu.cgi
-      ?query=%2Bmessage-id:<$MESSAGE_ID>
-      &submit=Search!
-      &idxname=$LIST
+https://lists.gnu.org/archive/cgi-bin/namazu.cgi
+    ?query=%2Bmessage-id:<$MESSAGE_ID>
+    &submit=Search!
+    &idxname=$LIST
   #+end_example
   ⇒
-  #+begin_src elisp
-  (defun mhonarc-to-messageid (url)
-    "Retrieve the Message-ID from an article archived on MHonArc."
-    (interactive
-     (list
-      (let* ((default (or (thing-at-point-url-at-point)
-                          (and (derived-mode-p 'eww-mode)
-                               (shr-url-at-point nil))))
-             (prompt (if default
-                         (format "URL? (%s) " default)
-                       "URL? ")))
-        (read-string prompt nil nil default))))
-    (with-current-buffer (url-retrieve-synchronously url)
-      (search-forward-regexp "^<!--X-Message-Id: \\(.+\\) -->$")
-      (message (xml-substitute-numeric-entities (match-string 1)))))
+  #+begin_src emacs-lisp
+(defun messageid-to-lgo-url (list id)
+  "Find the lists.gnu.org URL for a given Message-ID."
+  (interactive
+   (list
+    (read-string "List: ")            ; TODO: default to current list.
+    (let ((default-id
+            (mail-header-message-id (gnus-summary-article-header))))
+      (read-string (format-prompt "Message-ID" default-id)
+                   nil nil default-id))))
+  (with-current-buffer
+      (url-retrieve-synchronously
+       (concat
+       ;; For some reason, literal "+" chars cause the search to fail.
+       ;; Escape them.
+        "https://lists.gnu.org/archive/cgi-bin/namazu.cgi"
+        "?query=%2Bmessage-id:"
+        (replace-regexp-in-string "\\+" "%2B" id)
+        "&submit=Search!"
+        "&idxname=" list))
+    (search-forward-regexp
+     (rx "<a href=\""
+         (group "/archive/html/" (literal list) "/"
+                (+ (any "0-9-")) "/msg" (+ (any "0-9")) ".html")
+         "\">"))
+    (let ((url (concat "https://lists.gnu.org" (match-string 1))))
+      (kill-new url)
+      (message url))))
   #+end_src
+
 - public-inbox: trivial
-*** TODO HTTP archive → Message-ID
+*** DONE HTTP archive → Message-ID
 - <https://lists.gnu.org>: cf. =X-Message-Id= comment in HTML
+  ⇒
+  #+begin_src emacs-lisp
+(defun mhonarc-to-messageid (url)
+  "Retrieve the Message-ID from an article archived on MHonArc."
+  (interactive
+   (list
+    (let ((default (or (thing-at-point-url-at-point)
+                       (and (derived-mode-p 'eww-mode)
+                            (shr-url-at-point nil)))))
+      (read-string (format-prompt "URL" default) nil nil default))))
+  (with-current-buffer (url-retrieve-synchronously url)
+    (search-forward-regexp "^<!--X-Message-Id: \\(.+\\) -->$")
+    (let ((id (xml-substitute-numeric-entities (match-string 1))))
+    (kill-new id)
+    (message id))))  
+  #+end_src
+
 - public-inbox: cf. URL