[Feature] Add support for previous_sha and current_sha outputs

[gm42]

Is this feature missing in the latest version?

• I'm using the latest release

Is your feature request related to a problem? Please describe.

Not related to a problem. I have seen that the action text output tells about which SHAs were used for the comparison:

Retrieving changes between b21edcea84825a0829e057c58fe245e6ca5a00df (main) → 92fbd4595dcaf9a1e2e92723247ce4f38a926817 (feat/my-branch)

This corresponds to this line of code: https://github.com/tj-actions/changed-files/blob/05f0aba931687dcad284e6c7f2e049c258a53fb8/src/main.ts#L131C46-L131C57

Describe the solution you'd like?

It would be great if I could extract these values via outputs, to re-use them in other steps.

Describe alternatives you've considered?

One can use ${{ github.event.pull_request.base.sha }} and ${{ github.event.pull_request.head.sha }} instead.

Anything else?

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[tj-actions-bot]

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[jackton1]

Hi @gm42 , can you provide some more details about your use case?

[gm42]

@jackton1 sure: one example is that after running this action one might want to put the used hashes in a text report telling about which files changed, or call git diff. I think it is necessary for composition with other actions which need a commit hash, in case one wants to also refer to the main branch commits.

[jackton1]

Hi @gm4, okay I’d suggest taking a look at https://github.com/nrwl/nx-set-shas which covers your use case. Since this action primary focus is to retrieve changed files.

[gm42]

Thanks for your answer; I disagree, that action is overkill for this and does not serve the purpose: this action is already deciding which commit SHAs to use, so by using a different action they could be different.

I will use a fork, no problem.