Add Panels support

Verified #5 on a local site with many Panels configs. Found and reported via IRC the issue that is resolved in #5. Seems to be working great now. I'd recommend #1863116: Support selective output per module get merged along with this, as the Panels report can be quite verbose. Additional improvements would be to support a different output format, e.g. --pipe or newline delimited as opposed to tabular. However, the patch as-is is highly useful.

I tried to verify using a fresh install of Panopoly 7.x-1.0-rc3 with the included Demo configuration (Panels 7.x-3.3+10-dev), but changes to cache settings weren't reflected by subsequent cacheaudits. I tried clearing Drush & Drupal caches, with no change. It seems like panels_load_display() isn't getting called.

I'll leave this in "needs review" since I wasn't testing with stable releases, and I'll see if I can track down the issue.

Examining the data after enabling caching, it appears that the values I'm setting in the Panels UI show up in _cacheaudit_load_panes() in $display->cache, even though $display->content[N]->cache is empty. I might be mistaken, but I presume the display's content would inherit the display cache settings (I am not a Panels expert by any means, so please correct me if I'm wrong), so the attached patch pushes that cache value from the display to its content if it is empty. Also I changed the first column to display the title instead of machine-name.

Erik it looks like your panels patch in comment 11 snuck in with commit 1f3407f. The attached patch builds off that.

Ah yes, I can see now - my issue previously was that Panopoly as a CSS issue which was preventing me from seeing the full set of options on the pane settings selector (including the pane cache setting).

Should we show the display cache settings together with the pane cache settings or as a separate report section?

This will fail when running on a D6 site with

PHP Fatal error:  Call to undefined function page_manager_get_tasks() in /Users/balu/.drush/cacheaudit/cacheaudit.drush.inc on line 274

Fatal error: Call to undefined function page_manager_get_tasks() in /Users/balu/.drush/cacheaudit/cacheaudit.drush.inc on line 274
Drush command terminated abnormally due to an unrecoverable error.                                                                                                                            [error]
Error: Call to undefined function page_manager_get_tasks() in /Users/balu/.drush/cacheaudit/cacheaudit.drush.inc, line 274

I'm seeing a similar error on a D7 site.

The issue mainly with #18 is because page_manager module is not enabled (even if panels is). There is no issue if the page_manager module is enabled and the output reports as expected.

Initially I used module_load within panels_cacheaudit() to load page_manager module, although I changed my mind and instead implemented hook_cacheaudit for page_manager module rather than panels. This means the hook will only fire when page_manager module is enabled (which is necessary for panels pages/panel nodes anyway).

I've also slightly altered functionality to clean up the output and not print the headers if there are no panels available.

Patch inclusive of patch at #14 and interdiff included.

Page manager is a dep for panelizer so I don't see why it shouldn't. I installed panopoly (which uses panelizer) and ran cacheaudit on the freshly installed site. This output the following extract which appears to be what is desired.

{above snip}
panels
----------------------------------------------------------------------------------------------------
 Panel                             Pane                                                 Region          Cache  Lifetime  Granularity
 User Login Page                   pm_existing_pages                                    contentmain                      <not set>
 User Password Page                pm_existing_pages                                    contentmain                      <not set>
 User Register Page                pm_existing_pages                                    contentmain                      <not set>
 Node Edit Page                    node_form_title                                      contentmain                      <not set>
{below snip}