This library uses OS X CoreLocation services to put useful
information into variables osx-location-latitude and
osx-location-longitude.
If you choose not to use one of the convenient packages in
MELPA, you'll need to add the
directory containing osx-location.el and EmacsLocationHelper to
your load-path, and then (require 'osx-location).
If you don't trust the required bundled executable
(EmacsLocationHelper) which does the communication with
CoreServices, you can build it yourself from the
instructions here or using the
bundled Makefile.
Start monitoring the location asynchronously like this:
M-x osx-location-watch
To add code which responds to location changes, use
osx-location-changed-hook. For example, you might add a hook
function which updates calendar-latitude and calendar-longitude
(defined in the built-in library solar), and then use
rase.el to execute code
automatically at sunrise or sunset.
Hook functions take no arguments; when your hook function runs, it can
use the freshly-updated values of osx-location-latitude and
osx-location-longitude.
Here's an example:
(eval-after-load 'osx-location
'(when (eq system-type 'darwin)
(add-hook 'osx-location-changed-hook
(lambda ()
(setq calendar-latitude osx-location-latitude
calendar-longitude osx-location-longitude
calendar-location-name (format "%s, %s" osx-location-latitude osx-location-longitude))))))