From 07a6e4601ac4459fc337f25e140650f4bdf8866b Mon Sep 17 00:00:00 2001
From: Yuchen Pei <id@ypei.org>
Date: Sat, 9 Sep 2023 12:53:02 +1000
Subject: [emacs] Fixing my-fetch-url etc.

---
 emacs/.emacs.d/lisp/my/my-net.el | 45 +++++++++++++++++++++++++++++++++++-----
 emacs/.emacs.d/lisp/my/my-org.el | 10 +++++----
 2 files changed, 46 insertions(+), 9 deletions(-)

(limited to 'emacs/.emacs.d/lisp')

diff --git a/emacs/.emacs.d/lisp/my/my-net.el b/emacs/.emacs.d/lisp/my/my-net.el
index 1ffbfae..0eafb7a 100644
--- a/emacs/.emacs.d/lisp/my/my-net.el
+++ b/emacs/.emacs.d/lisp/my/my-net.el
@@ -36,14 +36,47 @@
     (car (url-path-and-query (url-generic-parse-url
                               (url-unhex-string url)))))))
 
-(defun my-fetch-url (url)
+;; stolen from `eww-make-unique-file-name'
+(defun my-make-unique-file-name (file directory)
+  "Uniquefy FILE under DIRECTORY.
+
+Like `expand-file-name', but make sure the file name has not been taken."
+  (cond
+   ((zerop (length file))
+    (setq file "!"))
+   ((string-match "\\`[.]" file)
+    (setq file (concat "!" file))))
+  (let ((count 1)
+        (stem file)
+        (suffix ""))
+    (when (string-match "\\`\\(.*\\)\\([.][^.]+\\)" file)
+      (setq stem (match-string 1 file)
+            suffix (match-string 2 file)))
+    (while (file-exists-p (expand-file-name file directory))
+      (setq file (format "%s(%d)%s" stem count suffix))
+      (setq count (1+ count)))
+    (expand-file-name file directory)))
+
+(defun my-fetch-url (url &optional no-overwrite)
+  "Fetch URL to a buffer, save it to a file, and switch to the buffer.
+
+The file is saved under `my-download-dir'.
+If NO-OVERWRITE is non-nil, do not overwrite any existing file."
   (interactive "sURL: ")
-  (let ((file-name (expand-file-name (my-make-file-name-from-url url)
-                                     my-download-dir)))
+  (let ((file-name
+         (if no-overwrite
+             (my-make-unique-file-name
+              (my-make-file-name-from-url url)
+              my-download-dir)
+           (expand-file-name
+            (my-make-file-name-from-url url)
+            my-download-dir))))
     (url-retrieve url 'my-fetch-url-save-and-switch (list file-name))))
 
-
 (defun my-fetch-url-save-and-switch (status file-name)
+  "A `url-retrieve' callback that saves the payload and switch to it.
+
+It checks the STATUS, and if it is ok, saves the payload to FILE-NAME."
   (when (plist-get status :error)
     (error "My fetch failed: %s" (plist-get status :error)))
   (my-delete-http-header)
@@ -52,7 +85,9 @@
         (coding-system-for-write 'utf-8))
     (kill-buffer)
     (with-current-buffer buffer
-      (insert to-insert)
+      (let ((inhibit-read-only t))
+        (erase-buffer)
+        (insert to-insert))
       (goto-char (point-min))
       (save-buffer)
       (revert-buffer t t))
diff --git a/emacs/.emacs.d/lisp/my/my-org.el b/emacs/.emacs.d/lisp/my/my-org.el
index 38eca7b..016bdd7 100644
--- a/emacs/.emacs.d/lisp/my/my-org.el
+++ b/emacs/.emacs.d/lisp/my/my-org.el
@@ -1281,10 +1281,12 @@ With a prefix arg, yank and exit immediately."
   (when (equal type "src")
     (insert (string-remove-suffix
              "-mode" (prin1-to-string (my-read-major-mode)))))
-  (org-edit-special)
-  (when current-prefix-arg
-    (yank)
-    (org-edit-src-exit)))
+  (let ((mark-was-active mark-active))
+    (org-edit-special)
+    (when current-prefix-arg
+      (unless mark-was-active
+        (yank))
+      (org-edit-src-exit))))
 
 (defun my-link-to-line-number-in-prog-mode ()
   "When in prog-mode, use line number as search item."
-- 
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