Assets Packing

[Sander Boer <sanderboer@yahoo.com>]

Hi all,

Maybe this already exists in org, but I needed a function that looks at 
all the image links, signals if the link is broken or not, copies the 
files into a folder and relinks it.

Comments and crits are greatly appreciated, I started coding elisp 2 
weeks ago, so any and all pointers and tips are welcome.

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(defcustom sndr-assets-dir nil
"the directory org linked assets are moved to, do not forget trailing 
slash..."
:type '(string)
:group'sndr
   )

(defun sndr-assets-package()
"finds file links and moves them to a dir specified, or ./assets , 
relative to the org file"
(interactive)
(let (p0 p1)
(save-excursion
   (goto-char (point-min))
   (while (search-forward-regexp 
"\\[\\[\\([^][]+\\)\\]\\(\\[\\([^][]+\\)\\]\\)?\\]" nil t)
     (match-beginning 1)
     (setq p0 (match-beginning 1))
     (setq p1 (match-end 1))
     (sndr-link-check-and-move p0 p1)
     )
)))

(defun sndr-link-check-and-move (p0 p1)
   "gets a buffer section, checks if it is a file, moves the file to a 
dir specified (or ./assets) and updates the buffer accordingly"
   (let (file newdir newfile)
     (setq file (buffer-substring-no-properties p0 p1 ))
     (file-exists-p file)
     (setq newdir (or sndr-assets-dir (concat (file-name-directory 
buffer-file-name) "assets/")))
     (setq newfile (concat newdir(file-name-nondirectory file)))
     (if (not (file-exists-p newdir))
       (make-directory newdir t))
     (if (file-exists-p file)
       (progn
	(if (not(file-exists-p newfile)) (copy-file file newfile))
	(goto-char p0)
	(delete-region p0 p1)
	(insert newfile)
	)
       (progn
	(goto-char p0)
	(delete-region p0 p1)
	(insert (concat "BROKEN#" file "#BROKEN"))
	))))

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sander.