I've got a string like "foo%20bar" and I want "foo bar" out of it.
I know there's got to be a built-in function to decode a URL-encoded string (query string) in Emacs Lisp, but for the life of me I can't find it today, either in my lisp/ folder or with google.
Anybody remember what it's called?
org-link-unescape does the job for very simple cases ...
w3m-url-decode-string is better, but it isn't built in and the version I have locally isn't working with Emacs 23.
In my case I needed to do this interactively. The previous answers gave me the right functions to call, then it was just a matter of wrapping it a little to make them interactive:
(defun func-region (start end func)
"run a function over the region between START and END in current buffer."
(let ((text (delete-and-extract-region start end)))
(insert (funcall func text)))))
(defun hex-region (start end)
"urlencode the region between START and END in current buffer."
(func-region start end #'url-hexify-string))
(defun unhex-region (start end)
"de-urlencode the region between START and END in current buffer."
(func-region start end #'url-unhex-string))
Add salt, I mean bind to keys according to taste.
Emacs is shipped with an URL library, that provides a bunch of URL parsing functions—as huaiyuan and Charlie Martin already pointed out. Here is a small example that'd give you an idea how to use it:
(let ((url "http://www.google.hu/search?q=elisp+decode+url&btnG=Google+keres%E9s&meta="))
;; Return list of arguments and values
;; Decode hexas
;; Retrieve argument list
;; Parse URL, return a struct
=> (("meta" "") ("btnG" "Google+keresés") ("/search?q" "elisp+decode+url"))
I think is better to rely on it than
org-mode as it is its main purpose to parse URL.
I think you're making it a little too hard:
split-string will probably do most of what you want. For fancier stuff, have a look at the functions in
url-expand.el; unfortunately, many of them don't have doc-strings, so you may have to read code.
url-generic-parse-url looks like a potential winner.