From 66fb229bc11dff59c839527e001d8767eb532d81 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <id@ypei.org>
Date: Sat, 9 Sep 2023 12:19:04 +1000
Subject: [emacs] some convenience editing functions in message mode

---
 emacs/.emacs.d/init/ycp-gnus.el   | 10 +++++--
 emacs/.emacs.d/lisp/my/my-gnus.el | 63 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 2 deletions(-)

diff --git a/emacs/.emacs.d/init/ycp-gnus.el b/emacs/.emacs.d/init/ycp-gnus.el
index fd15e7f..43d56cc 100644
--- a/emacs/.emacs.d/init/ycp-gnus.el
+++ b/emacs/.emacs.d/init/ycp-gnus.el
@@ -32,7 +32,7 @@
 
 ;;; `mm-encode'
 (my-package mm-encode
-  (setq mm-encrypt-option nil             ; use 'guided if you need more control
+  (setq mm-encrypt-option nil   ; use 'guided if you need more control
         mm-sign-option nil))  ; same
 
 ;;; `mml-sec'
@@ -52,10 +52,14 @@
         message-ignored-cited-headers ""  ; default is "." for all headers
         message-confirm-send nil
         message-kill-buffer-on-exit t
-        message-wide-reply-confirm-recipients t
+        message-wide-reply-confirm-recipients nil
         message-citation-line-format
 	      "On %a %Y-%m-%d %H:%M:%S %z, %N wrote:\n")
   (add-hook 'message-setup-hook #'message-sort-headers)
+  (require 'my-gnus)
+  (my-keybind message-mode-map
+    "M-n" #'my-message-after-next-cited
+    "M-p" #'my-message-before-previous-cited)
   )
 
 (my-package smtpmail
@@ -103,6 +107,8 @@
   (setq gnus-message-replysign t)
   (my-setq-from-local gnus-posting-styles)
   (my-override mm-display-external)
+  (add-hook 'gnus-message-setup-hook #'message-remove-blank-cited-lines)
+  (add-hook 'gnus-message-setup-hook #'my-message-remove-trailing-cited-lines)
   )
 
 ;; checking sources
diff --git a/emacs/.emacs.d/lisp/my/my-gnus.el b/emacs/.emacs.d/lisp/my/my-gnus.el
index 9c42204..599a19c 100644
--- a/emacs/.emacs.d/lisp/my/my-gnus.el
+++ b/emacs/.emacs.d/lisp/my/my-gnus.el
@@ -27,6 +27,69 @@
 ;;; Code:
 
 
+;;; `message-mode', the mode to compose messages
+(defun my-message-elide-remaining ()
+  "Elide all cited text after point."
+  (interactive)
+  (when-let* ((beg (point))
+              (citexp (concat "^\\("
+			                        (concat message-yank-cited-prefix "\\|")
+			                        message-yank-prefix
+			                        "\\)"))
+              (end (save-excursion
+                     (goto-char (point-max))
+                     (when (re-search-backward citexp nil t)
+                       (beginning-of-line 2)
+                       (point)))))
+    (when (< beg end) (message-elide-region beg end))))
+
+(defun my-message-remove-trailing-cited-lines ()
+  "Remove all trailing cited lines."
+  (interactive)
+  (save-excursion
+    (when-let* ((citexp (concat "^\\("
+			                          (concat message-yank-cited-prefix "\\|")
+			                          message-yank-prefix
+			                          "\\)+ *\n"))
+                (end (progn
+                       (goto-char (point-max))
+                       (when (re-search-backward citexp nil t)
+                         (beginning-of-line 2)
+                         (point))))
+                (beg (progn (beginning-of-line 0)
+                            (while (looking-at-p citexp)
+                              (beginning-of-line 0))
+                            (beginning-of-line 2)
+                            (point))))
+      (when (< beg end) (delete-region beg end)))))
+
+(defun my-message-before-previous-cited ()
+  "Move point to before previous cited portion."
+  (interactive)
+  (let ((citexp (concat "^\\("
+			                  (concat message-yank-cited-prefix "\\|")
+			                  message-yank-prefix
+			                  "\\)")))
+    (beginning-of-line 1)
+    (unless (looking-at-p citexp)
+      (re-search-backward citexp nil t))
+    (beginning-of-line 0)
+    (while (looking-at-p citexp)
+      (beginning-of-line 0))))
+
+(defun my-message-after-next-cited ()
+  "Move point to after the next cited portion."
+  (interactive)
+  (let ((citexp (concat "^\\("
+			                  (concat message-yank-cited-prefix "\\|")
+			                  message-yank-prefix
+			                  "\\)")))
+    (beginning-of-line 1)
+    (unless (looking-at-p citexp)
+      (re-search-forward citexp nil t))
+    (beginning-of-line 2)
+    (while (looking-at-p citexp)
+      (beginning-of-line 2))))
 
 (defun my-gnus-summary-exit-like-mu4e () (interactive)
        (if (get-buffer-window (gnus-buffer-live-p gnus-article-buffer))
-- 
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