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.
What is it 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." (save-excursion (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." (interactive "r") (func-region start end #'url-hexify-string)) (defun unhex-region (start end) "de-urlencode the region between START and END in current buffer." (interactive "r") (func-region start end #'url-unhex-string))
Add salt, I mean bind to keys according to taste.
Emacs is shipped with a 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 (url-parse-query-string ;; Decode hexas (url-unhex-string ;; Retrieve argument list (url-filename ;; Parse URL, return a struct (url-generic-parse-url url))))) => (("meta" "") ("btnG" "Google+keresés") ("/search?q" "elisp+decode+url"))
I think is better to rely on it rather than Org-mode as it is its main purpose to parse a 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.
You can grab
urlenc from MELPA and use
urlenc:decode-region for a region or
urlenc:decode-insert to insert your text interactively.