A development-mode tool for selectively overriding Composer settings. In particular, it is useful when you are developing multiple Composer projects that interrelate and are on git repositories you have cloned to your local machine.

The haydn.json file allows you to temporarily override, add, or remove package-versions repositories which are defined in composer.json. This allows you to point to local repositories and dev-branches on those repositories.

This example adds/overrides the mycorp/foo and mycorp/baz dependencies, removes the mycorp/bar dependency, and overrides any custom repositories with an url git@repo.corp.net:shared/foo/.git to point to a local git folder. (If none match, it will just add a new repository.)

{
    "override-require": {
        "mycorp/foo" : "dev-featurebranch",
        "mycorp/bar" : ""
    },
    "override-require-dev": {
        "mycorp/baz" : "dev-featurebranch",
    },
    "override-repositories": {
        "git@repo.corp.net:shared/foo/.git" : {
            "type" : "vcs",
            "url" : "/home/jdoe/code/foo/"
        }
    }
}

• Add haydn.php and make it executable with chmod +x
• Create a haydn.json file
• Either composer.phar or composer must be in your path and executable.

This command will create a modified temporary copy of composer.json and trigger Composer to act upon the temporary copy.

haydn.php update

All command-line arguments to haydn are passed on to composer. As far as Composer is concerned, the only difference is that it's been told to operate just this once on a different composer.json file than normal.