bug#55278: 29.0.50; OSM package

[Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Richard Stallman <rms@gnu.org> writes:

> That is strange.  If the function json-parse-string is defined in the
> Emacs sources, why compile it only if something else is enabled?

Jansson is a library for parsing JSON.  Emacs provides two mechanisms
for parsing JSON into Lisp data, one of which is based on the Jansson
library, and the other is implemented in Lisp inside json.el.

OSM uses the former, but it can trivially be made to use the latter:

--- a/osm.el
+++ b/osm.el
@@ -39,6 +39,7 @@
 
 (require 'bookmark)
 (require 'dom)
+(require 'json)
 (eval-when-compile
   (require 'cl-lib)
   (require 'subr-x))
@@ -1376,14 +1377,12 @@
 
 (defun osm--fetch-json (url)
   "Get json from URL."
-  (json-parse-string
+  (json-read-from-string
    (let ((default-process-coding-system '(utf-8-unix . utf-8-unix)))
      (shell-command-to-string
       (concat
        "curl " osm-curl-options " "
-       (shell-quote-argument url))))
-   :array-type 'list
-   :object-type 'alist))
+       (shell-quote-argument url))))))
 
 ;;;###autoload
 (defun osm-search (search &optional lucky)