Add support for Ruby, ERB and slim

[afriqs]

See apache/skywalking#7744 😅

[Copilot]

Pull request overview

This PR adds comment-style and test coverage to support applying Apache license headers to Ruby (.rb), ERB (.erb / .js.erb), and Slim (.slim) files within the skywalking-eyes header tooling.

Changes:

• Add new comment styles for ERB (<% ... %> wrapping with # lines) and Slim (single / line comments).
• Wire new/updated comment_style_id mappings for Ruby, ERB-containing languages, and Slim in assets/languages.yaml.
• Extend header fixing tests and add include-test fixtures for Ruby/ERB/Slim with and without license headers.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

File	Description
assets/styles.yaml	Adds ERB and Slim comment-style definitions used by header generation/fixing.
assets/languages.yaml	Maps Ruby / ERB languages and Slim to the new/existing comment styles.
pkg/header/fix_test.go	Adds fix/insert expectations for Ruby (with/without shebang), ERB, and Slim.
test/testdata/include_test/**	Adds new fixture files for header check tests across Ruby/ERB/Slim.

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[afriqs]

Is this a a char or a regexp? Others only seem to be chars and not regexp but it fails with a regexp see https://github.com/apache/skywalking-eyes/actions/runs/23291104829/job/67726951492?pr=266#step:6:940 🤷

[kezhenxu94]

Please fix the CI

[kezhenxu94]

@copilot fix the CI

[wu-sheng]

I checked out this PR locally to debug the CI failure. There are two separate problems, and fixing only the first one is not enough:

1. The Slash comment style must be literal text, not a regular expression (the inline suggestion below). The style markers are joined literally by GenerateLicenseHeader, which is why the generated headers currently contain a literal ^\/. That's what breaks TestFix/test.slim and TestRewriteContent/Slim*.

2. header check cannot recognize single-/ comments at all, which is why TestCheckFile/WithLicense/.../testcase.slim fails even after reverting to a literal / (this is probably what prompted the ^\/ attempt in 23c1445). The license normalizer in pkg/license/norm.go strips //, /*, */ etc. from headers before matching, but has no rule for a single /, so Slim headers never match the configured license. Please add this rule (it must come after the /* family so it doesn't interfere):

--- a/pkg/license/norm.go
+++ b/pkg/license/norm.go
@@ -52,6 +52,7 @@
 		regexp.MustCompile(`(?m)^\s*/\*+`), // /*
 		regexp.MustCompile(`(?m)^\s*\*+/`), //  */
 		regexp.MustCompile(`(?m)^\s*\*+`),  //  *
+		regexp.MustCompile(`(?m)^\s*/`),    //  / e.g. Slim, must come after the /* and // patterns
 
 		regexp.MustCompile(`(?m)^\s*<!--+`), // <!--
 		regexp.MustCompile(`(?m)^\s*--+>`),  // -->

With both changes applied I verified locally on a clean checkout of this branch (and on its merge with current main): the full test suite passes, golangci-lint is clean, and an end-to-end round-trip works — header fix on fresh .slim/.erb/.rb files writes correct headers and header check then validates all of them.

Since "Allow edits by maintainers" is disabled on the fork, I can't push these two changes to this branch myself — please apply the suggestion below and the diff above, and the CI should turn green.

[wu-sheng]

Suggested change

	start: '^\/'
	middle: '^\/'
	end: '^\/'
	start: '/'
	middle: '/'
	end: '/'

The comment style markers are literal texts joined by GenerateLicenseHeader, not regular expressions, so these should be the literal /.

[afriqs]

Thanks for troubleshooting it. Just pushed the updated commits.