Document all Metatag's hooks

We need to fully document this for the 1.0 release.

A placeholder so other issues have somewhere to add details to.

I've committed this file, but more work is needed.

Sweet, thanks!
I can't wait to define my own (Token based) meta tags.
Great stuff.

Example on how to create your own meta tags using Metatag module.
http://www.agileapproach.com/blog-entry/creating-custom-meta-tags-metata...

@s1l: Excellent post! Thank you!

Marked #1709218: Metatag API Documentation as a duplicate.

Marked #1391968: Document how to disable/modify meta tags as a duplicate.

Marked #1308164: Documentation Please! as a duplicate.

Clarified the issue.

Marked #1655082: How to load metatags/opengraph tags for a specific node? as a duplicate.

Marked #1318182: Custom tags as a duplicate.

Provided more details on what needs to be documented.

Document how to customize form fields.

This is a starting point, all new hooks are at least added to metatag.api.php and everywhere the hooks are triggered there's a comment to say what the hook name is.

I've committed #12 to keep the ball rolling, but it needs further work.

RTFM, manual, readme, help, ponies.

To help people find this page via the issue search. ;)

Is it already possible to make a field (eg Description) required and if so: can anyone help me with it? I'm not a very experienced coder...

Please can you quickly explain how to load meta tags for an entity (including any defaults setup)?

I've tried metatag_metatags_load, but this doesn't seem to work :-(

Lets keep this issue focused on documenting the new hooks, leave #1858116: Document how to use Metatag's functions to manage using Metatag's funtions for other uses.

Re. #5: Can someone please confirm that the proper procedure for adding a metatag, to be managed via metatags module, is to write a module?

Added the question of one of the issues that was marked as duplicate.

Some documentation was added recently, taking this off the blockers list and will work on it further post-1.0.

Can you provide an example on how to trigger your metatag_presave hook? Saving a node with metadata doesn't seem to do it, at least based on my dsm calls. And is the documentation for this hook missing a $language parameter (based on the .module file around like 415 as of beta7) of the function?
Thanks!
Marc

Here's a related issue:

#2678004: Complete api documentation

Maybe one can be marked as duplicate.

Is there any way to make the Meta description field mandatory and limit the field to number of char(160 max) and accordingly change the meta description field description.

Any help will be really useful. Also if we can document it in this page it self it will be great.

https://www.drupal.org/project/metatag/issues/1391968#comment-7291458

https://www.drupal.org/project/metatag/issues/1466292#comment-6874960

I see few folks are also trying to get the answer.

@Devaraj: Please see #2309017: Automatically trim meta tag lengths (D7).