Add WordPress dropin support

[bueltge]

WordPress alows to replace some functions with Dropins.
This small change in the commit allow to add via composer the dropin.

Below is a table with all Dropins I know or I have found. The possible Dropins are echoing via the function _get_dropins().

FILE	TYPE OF DROPIN	ACTIVE SINCE	CONTEXT
advanced-cache.php	Advanced or Alternative Cache	Constant WP_CACHEis TRUE	Single Installation
db.php	Own database class	Always	Single installation
db-error.php	Own database error alert	At DB Error	Single installation
install.php	Own installation routine	At installation	Single installation
maintenance.php	Own maintenance message	At updates, maintenance	Single installation
object-cache.php	External Object Cache	Always	Single installation
sunrise.php	Before the WP Multisite Installation gets loaded	If constant SUNRISEset	Multisite installation
blog-deleted.php	Own message, when a blog gets deleted	If a blog gets deleted	Multisite installation
blog-inactive.php	Own message, if a blog is set inactive	If a blog becomes inactive	Multisite installation
blog-suspended.php	Own message, if a blog got suspended	When a blog gets marked as archive or spam	Multisite installation
$locale.php	functions at active language key	When language key set in constant WP_LANG	Single & multisite installation

[johnpbloch]

👍 would love to see this. It might also make sense to look for these files in the package (maybe with a composer.json extra override hash?) and manage them directly as part of the install/update/delete process.

[sbuzonas]

I'm not sure it's feasible to add drop-in support to this project. Drop-ins are single files, and composer installs a directory of files and dependencies.

[bueltge]

Same idea, new pull request, but redundant - #288

[bueltge]

@slbmeh This should work. Composer have the feature, but is not documented.
see composer/composer#946
"type": "file"

[pySilver]

@bueltge i'm not sure I got you right. Where exactly "type": "file" should go? To my drop-in? It already has wordpress-dropin type ...

[bueltge]

This type is for the dist parameter.

"dist": {
    "type": "file",
    "url": "path/to/file"
},

like this context

    "repositories": [
    {
        "type": "package",
        "package": {
            "name": "user/repo-dropin",
            "type": "wordpress-dropin",
            "version": "1.5",
            "dist": {
                "type": "file",
                "url": ""
            },
            "require": {
                "composer/installers": "v1.0.7"
            }
        }
    }

Sorry, I haven't currently a project or access to a topic. Also I haven't currently possibilities to work with composer, a client behind a proxy.