Actually exclude the vendor dir

[radford]

This avoids including the entire vendor directory twice which greatly speeds up phar generation.

[radford]

This might be better done by getting $this->package['config']['vendor-dir'] directly or by adding a getPathVendorRelative() which does that.

[radford]

I went ahead an implemented getPathVendorRelative() and pushed it. the combined patch looks much better. I'd happy to squash these if you'd prefer that.

[clue]

Awesome, I'd love to get this in! 👍 Can you add a test case to confirm this doesn't break anything?

[radford]

Looks like I forgot to actually commit my change to add getPathVendorRelative(). I pushed that and rebased the fix on top of it.

[clue]

Thanks for the update, the code looks good to me! 👍 Can you add some tests?

The CI setup is currently broken (see #49), so I'll have to postpone merging this for now.

[clue]

I'm currently in the process of reviewing this and I'm testing several approaches to reducing the build time.

Just for the reference, this PR alone brings the build time for composer/composer from 340s down to 150s.

[clue]

Thanks for your effort and your patience @radford!