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+;;; scimax-qr.el --- qr code utilities for scimax
+
+;;; Commentary:
+;;
+;; * Utilities for QR codes in scimax.
+;; 
+;; `scimax-insert-qr' will generate and insert a QR code link in your document.
+;; This relies on `org-id' so you need to be in a heading.
+;;
+;; `scimax-read-qr' uses a screencapture method to read a QR code somewhere on
+;; your screen. I use applescript, so this is Mac specific.
+;;
+;; This relies on Python libraries: qrcode, PIL and zbarlight. Installation is
+;; not totally obvious. see https://github.com/Polyconseil/zbarlight/
+
+;; #+BEGIN_SRC sh
+;; brew install zbar
+;; export LDFLAGS="-L$(brew --prefix zbar)/lib"
+;; export CFLAGS="-I$(brew --prefix zbar)/include"
+;; pip install zbarlight
+;; #+END_SRC
+;; 
+;; This is alpha code. It is not obvious what the best thing to save in the QR
+;; code is. At the moment I save an `org-id' which is useful to get you back to
+;; a heading. It is less useful to get to a location though.
+;;
+;; An alternative could be an editmark, or a an nb link, which could be a
+;; pointer to a specific location. You would have to rely on `org-db' to find it
+;; again (I already rely on it for `org-id').
+;;
+;; I use a qr link for this. It has limited export support: LaTeX and HTML for
+;; now. Note when the link is activated, a qr code will be saved in the current
+;; directory. I don't love that, but it is simple, and there is not an obvious
+;; central place to keep them.
+;;
+;; Limitations: If you don't have an `id' corresponding to a QR code, nothing
+;; will happen. It might even be true that if you haven't opened that id before,
+;; so it isn't registered with your db, you won't be able to navigate to it.
+
+(org-link-set-parameters
+ "qr"
+ :follow (lambda (path)
+	   (scimax-qr/body))
+ :help-echo "Click to open the QR code."
+ ;; Overlay the QR code on it
+ :activate-func (lambda (start end path bracketp)
+		  (when
+		      (and
+		       ;; got a path
+		       path 
+		       ;; and there is no overlay here.
+		       (not (ov-at start)))
+		    (let* ((qr (concat path ".png"))
+			   ov
+			   img
+			   (script (format "import qrcode
+qr = qrcode.QRCode(box_size=5)
+qr.add_data('%s')
+qr.make(fit=True)
+img = qr.make_image()
+img.save('%s')
+"
+					   
+					   (format "[[qr:%s]]" path)
+					   qr)))
+		      (unless (file-exists-p qr)
+			(shell-command (format "python -c \"%s\"" script)))
+		      (setq img (create-image (expand-file-name qr))
+			    ov (make-overlay start end))
+		      (overlay-put ov 'display img) 
+		      (overlay-put ov 'face 'default)
+		      (overlay-put ov 'org-image-overlay t)
+		      (overlay-put ov 'modification-hooks
+				   (list
+				    `(lambda (&rest args)
+				       (org-display-inline-remove-overlay ,ov t ,start ,end))))
+		      (push ov org-inline-image-overlays))))
+ ;; export is hard here. There is no easy way to get to the path of the overlay.
+ ;; I don't really want to have to regenerate it.
+ :export (lambda (path desc backend)
+	   (cond
+	    ((eq 'latex backend)
+	     (format "\\includegraphics[width=1in]{%s}" (concat path ".png")))
+	    ((eq 'html backend)
+	     (format "<img src=\"%s\"/>" (concat path ".png")))
+	    (t
+	     (error "%s is not supported yet" backend)))))
+
+
+
+(defun scimax-qr-redraw-thumbnails (&optional include-linked refresh beg end)
+  "Use font-lock to redraw the links."
+  (with-current-buffer (or (buffer-base-buffer) (current-buffer))
+    (org-restart-font-lock)))
+
+
+;; This gets the thumbnails to be redrawn with inline image toggling.
+(advice-add 'org-display-inline-images :after 'scimax-qr-redraw-thumbnails)
+
+
+(defhydra scimax-qr (:color blue :hint nil)
+  "QR actions
+"
+  ("o" (lambda ()
+	 (interactive)
+	 (let ((lnk (org-element-context)))
+	   (org-id-goto (org-element-property :path lnk))))
+   "Open")
+  ("c" (lambda ()
+	 (interactive)
+	 (let ((lnk (org-element-context)))
+	   (kill-new (format "[[qr:%s]]" (org-element-property :path lnk)))))
+   "Copy"))
+
+
+(defun scimax-get-qr ()
+  "Create a qr-code for the current heading at point.
+Relies on `org-id'.
+Returns a string for the qr link."
+  (interactive )
+  (when (org-before-first-heading-p)
+    (error "You are not in an org-heading"))
+  (format "[[qr:%s]]" (org-id-get-create)))
+
+
+(defun scimax-insert-qr (&optional size)
+  "Insert a QR code image link."
+  (interactive "P")
+  (insert (scimax-get-qr)))
+
+
+(defun scimax-read-qr ()
+  "Read a QR code.
+You will be prompted to choose the QR code by a screenshot.
+Returns the contents of the QR code."
+  (interactive)
+  (let* ((fname (make-temp-file "qr-" nil ".png"))
+	 (script (format "from PIL import Image
+import zbarlight
+
+file_path = '%s'
+with open(file_path, 'rb') as image_file:
+    image = Image.open(image_file)
+    image.load()
+
+codes = zbarlight.scan_codes(['qrcode'], image)
+print(codes[0].decode())" fname))
+	 (result))
+    (do-applescript
+     (mapconcat
+      'identity
+      (list (format "set screenshotFilePath to \"%s\"" (expand-file-name fname))
+	    "do shell script \"screencapture \" & \"-i \" & \" \" & quoted form of screenshotFilePath"
+	    (concat "set result to \"[[./" fname "]]\"")
+	    "set the clipboard to result")
+      "\n"))
+    (prog1 (setq result (shell-command-to-string (format "python -c \"%s\"" script)))
+      (message result)
+      (delete-file fname))))
+
+
+(defun scimax-follow-qr ()
+  "Read and follow a QR code.
+Small effort made to only follow QR links to org-id."
+  (interactive)
+  (let ((result (scimax-read-qr)))
+    (cond
+     ((s-starts-with? "[[qr:" result)
+      (with-temp-buffer
+	(insert result)
+	(org-mode)
+	(goto-char (point-min))
+	(org-id-goto (plist-get (cadr (org-element-link-parser)) :path))))
+     (t
+      (message "We don't handle \"%s\" yet." result)))))
+
+
+(provide 'scimax-qr)
+
+;;; scimax-qr.el ends here