Add option to select DIFF_HEAD for changed files comparsion

[henry2423]

There's an issue report on https://github.com/norio-nomura/action-swiftlint/issues/23. The DIFF_BASE: ${{ github.base_ref }} may not work in some cases, for example, the pull_request checking. The reason for that is: For the pull_request, the actions/checkout will set the HEAD to the refs/remotes/pull/{PR_NUMBER}/merge, but the ${{ github.base_ref }} isn't set. So we have to fetch the ${{ github manually.base_ref }} (usually the master). The original diff comparison only runs on FETCH_HEAD and given base_ref. But in this case, the FETCH_HEAD will be the base_ref because we call the git fetch. Therefore, I set up a customizable HEAD and BASE parameters gives us more flexibility to deal with more jobs scenario, like the above case.

And for the backward compatibility, I didn't remove the old implement to ensure the others won't break.

name: CI

on: pull_request

jobs:
  PR-Check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Fetch base ref
        if: ${{ always() }}
        run: |
          git fetch --prune --no-tags --depth=1 origin +refs/heads/${{ github.base_ref }}:refs/heads/${{ github.base_ref }}
      - name: SwiftLint (Only files changed in the PR)
        if: ${{ always() }}
        uses: henry2423/action-swiftlint@Fix-PR-Lint
        with:
          args: --force-exclude --strict --config build-swiftlint.yml
        env:
           DIFF_BASE: ${{ github.base_ref }}
           DIFF_HEAD: HEAD

[richimf]

This solution works for me, but I removed this line. What is this for?

with:
 args: --force-exclude --strict --config build-swiftlint.yml

[henry2423]

This solution works for me, but I removed this line. What is this for?

with:
 args: --force-exclude --strict --config build-swiftlint.yml

@richimf These configs are the options you can give to swiftlint lint. You can check it out with swiftlint help lint locally.

$swiftlint help lint

Print lint warnings and errors (default command)

[--path (string)]
	the path to the file or directory to lint

[--use-stdin]
	lint standard input

[--config (string)]
	the path to one or more SwiftLint configuration files, evaluated as a parent-child hierarchy

[--strict]
	upgrades warnings to serious violations (errors)

[--lenient]
	downgrades serious violations to warnings, warning threshold is disabled

[--force-exclude]
	exclude files in config `excluded` even if their paths are explicitly specified

[--use-alternative-excluding]
	alternative exclude paths algorithm for `excluded`.may speed up excluding for some cases

[--use-script-input-files]
	read SCRIPT_INPUT_FILE* environment variables as files

[--benchmark]
	save benchmarks to benchmark_files.txt and benchmark_rules.txt

[--reporter (string)]
	the reporter used to log errors and warnings

[--quiet]
	don't print status logs like 'Linting <file>' & 'Done linting'

[--cache-path (string)]
	the directory of the cache used when linting

[--no-cache]
	ignore cache when linting

[--enable-all-rules]
	run all rules, even opt-in and disabled ones, ignoring `only_rules`

[[""]]
	list of paths to the files or directories to lint

[jklein24]

Any chance we can get this merged soon? It's a pretty major improvement and a ticket has been open for this issue for a pretty long time now.

[CalebeRios]

Any news? This update is an important issue @norio-nomura

[hervenivon]

In case you don't already know,

I had issues with this https://github.com/norio-nomura/action-swiftlint. @sinoru's version https://github.com/sinoru/actions-swiftlint solved most of them, and the code is clearly maintained.

[kyzmitch]

In case you don't already know,

I had issues with this https://github.com/norio-nomura/action-swiftlint. @sinoru's version https://github.com/sinoru/actions-swiftlint solved most of them, and the code is clearly maintained.

I don't see that it is clearly maintained, there are no pull requests, it is not nice to promote own fork in the original repo