Add maven shell script formatting support via shfmt

[tcrawford-figure]

This adds Maven support for shfmt and addresses #1567. This is a follow up to #1994. Closes #1567 #1776

[tcrawford-figure]

Please let me know if I missed some detail that enables these types of formatters (ones that need to shell out) to run in GitHub action workflows. I'd be happy to add whatever is needed to get this to run in GHA.

[nedtwigg]

I replaced @Disabled with @ShfmtTest. If you run gradlew test these tests will not run. They only run when you run ./gradlew testShfmt to run them.

• https://github.com/diffplug/spotless/blob/main/gradle/special-tests.gradle

If you want them to run on CI, you should add them with the npm test

spotless/.github/workflows/ci.yml

Lines 79 to 81 in 797a665

	- name: test npm
	if: matrix.kind == 'npm'
	run: ./gradlew testNpm

• change it to ./gradlew testNpm testShfmt

The only tricky part is getting shfmt onto the CI runner. Not that hard though. Feel free to open a PR for it and mess around.

[tcrawford-figure]

Perfect! Thank you for the clarification.

[nedtwigg]

Published in plugin-maven 2.43.0.