macos: clipboard image paste via cmd+v (pngpaste)

my/smart-paste bound to s-v (cmd+v) in org-mode and markdown-mode:
- clipboard has image → my/paste-image-from-clipboard
- clipboard has text  → normal yank

my/paste-image-from-clipboard:
- saves to attachments/ relative to current file
- filename: image-YYYYMMDD-HHMMSS.png
- org-mode:      [[./attachments/image-....png]]
- markdown-mode: ![filename](./attachments/image-....png)
- creates attachments/ dir if missing

Requires: brew install pngpaste

config.el

@@ -84,6 +84,64 @@
 (after! evil
   (setq evil-want-clipboard t))
 
+;;; ============================================================
+;;; CLIPBOARD IMAGE PASTE (macOS — cmd+v)
+;;; ============================================================
+;; Requires: brew install pngpaste
+;;
+;; cmd+v behaviour:
+;;   clipboard has image → saves to attachments/ → inserts link
+;;   clipboard has text  → normal paste (yank)
+;;
+;; Org:      [[./attachments/image-TIMESTAMP.png]]
+;; Markdown: ![image-TIMESTAMP.png](./attachments/image-TIMESTAMP.png)
+;;
+;; attachments/ is always relative to the current file's directory.
+
+(defun my/clipboard-has-image-p ()
+  "Return non-nil if macOS clipboard contains an image (requires pngpaste)."
+  (and (executable-find "pngpaste")
+       (let ((tmp (make-temp-file "emacs-imgcheck" nil ".png")))
+         (prog1 (= 0 (call-process "pngpaste" nil nil nil tmp))
+           (ignore-errors (delete-file tmp))))))
+
+(defun my/paste-image-from-clipboard ()
+  "Save clipboard image to attachments/ subdir and insert link at point.
+File: image-YYYYMMDD-HHMMSS.png. Supports org-mode and markdown-mode."
+  (interactive)
+  (let* ((base-dir   (if buffer-file-name
+                         (file-name-directory (buffer-file-name))
+                       default-directory))
+         (attach-dir (expand-file-name "attachments" base-dir))
+         (filename   (format-time-string "image-%Y%m%d-%H%M%S.png"))
+         (filepath   (expand-file-name filename attach-dir))
+         (relpath    (concat "attachments/" filename)))
+    (make-directory attach-dir t)
+    (if (= 0 (call-process "pngpaste" nil nil nil filepath))
+        (progn
+          (insert (pcase major-mode
+                    ('org-mode      (format "[[./%s]]" relpath))
+                    ('markdown-mode (format "![%s](./%s)" filename relpath))
+                    (_              relpath)))
+          (message "✓ Image saved: %s" relpath))
+      (error "pngpaste failed — no image in clipboard?"))))
+
+(defun my/smart-paste ()
+  "Paste image if clipboard has one, else normal yank (text paste).
+Bound to cmd+v in org-mode and markdown-mode."
+  (interactive)
+  (if (my/clipboard-has-image-p)
+      (my/paste-image-from-clipboard)
+    (yank)))
+
+;; Bind cmd+v to smart paste in org and markdown
+(map! :after org
+      :map org-mode-map
+      "s-v" #'my/smart-paste)
+(map! :after markdown-mode
+      :map markdown-mode-map
+      "s-v" #'my/smart-paste)
+
 ;; macOS Zoom accessibility — cancel persp-mode's 2.5s cache timer after startup
 ;; (reduces unnecessary redraws that cause Zoom to jump)
 (run-with-timer 3 nil