Pre-Merge and post-Merge commands

[phayes]

This pull request adds both pre-merge and post-merge command hooks.

Specifically, it adds: pre-merge-require-cmd pre-merge-optional-cmd post-merge-required-cmd post-merge-optional-cmd

This allows users to trigger scripts just before a merge happens or just after a merge happens. For example:

    "scripts": {
        "pre-merge-require-cmd": [
            "\\MyProject\\composer\\ScriptHandler::myPreMergeCommand"
        ]
    }

[phayes]

I'm a little lost on the error that Travis is reporting. Any guidance on how to update the tests to account for this change?

[bd808]

I'm a little lost on the error that Travis is reporting. Any guidance on how to update the tests to account for this change?

The $this->composer member used in the tests is a Prophecy mock and not a live object. You need to update all the tests that will trigger calls to $this->composer->getEventDispatcher()->dispatchScript(...) by the plugin to return a mock when $this->composer->getEventDispatcher() is called and then have that mock expect the appropriate calls from the plugin code.

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This patch also needs documentation updates if we land it. Features that are only discoverable by reading the source code are not generally useful.

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I'm not fundamentally against this relatively small addition, but it is nice to have an associated issue that documents the intended use-case and allows for discussion. Inevitably someone will file a bug saying that this new feature doesn't work for their use-case of X and it is nice to be able to look and see if this is something that we reasonably hoped would be possible when introducing the feature or not.

[bd808]

Closed for inactivity.