go-cover

name	go-cover
description	Generate Go test coverage report with package breakdown.
argument-hint	package-pattern
allowed-tools	Bash
model	haiku

Instructions

1. Validate: Check go.mod exists in cwd or parent dirs

2. Execute:

   • Pattern: <ARG> or default ./...
   • --html: Generate coverage.html and report path
   • Run: go test -coverprofile=coverage.out -covermode=atomic <pattern>

3. Parse: Extract per-package coverage from coverage.out

   • Skip mode/total lines
   • Group by package path
   • Calculate percentage: (covered statements / total statements) × 100

4. Format:

   ## COVERAGE REPORT
   
   | Package        | Coverage | Target | Status |
   |----------------|----------|--------|--------|
   | pkg/domain     | 87.2%    | 80%    | PASS   |
   | pkg/service    | 72.1%    | 80%    | FAIL   |
   
   **Overall:** 83.4% | **Target:** 80% | **Status:** PASS
   

5. Report:

   • Standard: Markdown table with overall status
   • HTML mode: "Coverage report: coverage.html"

6. Edge cases:

   • No tests: "No test files found in <pattern>"
   • Build failure: Report compilation errors (first 5 lines)
   • Target: Env GO_COVER_TARGET or default 80%