Added ability to change composer.json filename

[zlodes]

We are using composer merge plugin and store local repositories and dependencies (for package development) into composer.dev.json.

This patch will add ability to change the composer.json filename via config.

[Jeroen-G]

Cool, thanks!
Are you able to write a test for using this with/without a custom composer file?

[zlodes]

Yeap, I can. I'll do it tomorrow.

[zlodes]

@Jeroen-G added tests

[zlodes]

🌚

[Jeroen-G]

Ok, so help me here: why should one want to change the filename of composer.json to somethingElse.json?

[zlodes]

Ok, so help me here: why should one want to change the filename of composer.json to somethingElse.json?

I wrote about this in the first message: it will be useful with merge plugin by wikimedia: https://github.com/wikimedia/composer-merge-plugin.

Sometimes we doesn't want to foul up our composer.json file. I use composer.dev.json (vcs-ignored) whom will be merged with original composer.json via merge plugin.