Recover links to VCS web viewers and issue tracker at views

There's actually internal support for this within VCAPI, though it's old and needs revisiting. Properly resolving a path for a viewer can be complicated (in the cross-vcs context, anyway), so it's gonna take more than a theme function.

The current configuration lets you map several links per repository, but, as mentioned by sdboyer, it worked on the old commitlog module, so now we just lack of that functionality on the views commitlog.

I think we can stick with that, but also providing a default list of urls per backend, anyway we need to revisit the implementation of VersioncontrolRepositoryUrlHandler class and how it interacts with current API.

Moving to bug as it is a regression.

Now that ctools plugins is proposed for #979040: Make pluggable the process of mapping of raw vcs data to Drupal users, I think we should do the same here(a plugin for providing replacements, IMHO as one array from a plugin callback), naturally I would like to wait until the first ctools patch gets in, so marking this as postponed until that happens.

This will be postponed also until the conversion of VersioncontrolRepositoryUrlHandler to ctools plugins is done: #354509: Make repository URL backends pluggable

this will probably be affected by #990644: Improve backend interaction with views too :-/

Tagging Git Sprint 8, ought to be resolved when all other repo viewing issues are resolved.

I am going to propose something based on #354509-12: Make repository URL backends pluggable.

Ok, here a patch that implement the links at views handlers, but it still needs work for bug tracker url on commit messages.

Gitweb diff url for the url handler depend on #1024428: Add blob hashes for item revisions.

What the patch does:

• Operation revision handler url webviewer integration.
• Add a views handler for item revision path
• Independent plugin class for gitweb url handler.
• url handlers: file and directory view for gitweb
• Add diff url for gitweb url handler depending on #1024428.

Removing gitweb stuff from this patch and based on the committed #354509: Make repository URL backends pluggable.

What the patch does:

• Operation revision handler url webviewer integration.
• Add a views handler for item revision path
• Add file and directory view URLs to handlers.

Finally, the issue tracker links working.

This patch:

• Add a views handler for operation message which handle issue tracker auto-links.

I forgot to handle empty links, here I do it.

upps