101 lines
2.3 KiB
Go
101 lines
2.3 KiB
Go
package golinters
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import (
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"fmt"
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"sync"
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"golang.org/x/tools/go/analysis"
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"honnef.co/go/tools/unused"
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"github.com/golangci/golangci-lint/pkg/config"
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"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
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"github.com/golangci/golangci-lint/pkg/lint/linter"
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"github.com/golangci/golangci-lint/pkg/result"
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)
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const unusedName = "unused"
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type UnusedSettings struct {
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GoVersion string
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}
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func NewUnused(settings *config.StaticCheckSettings) *goanalysis.Linter {
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var mu sync.Mutex
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var resIssues []goanalysis.Issue
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analyzer := &analysis.Analyzer{
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Name: unusedName,
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Doc: unused.Analyzer.Analyzer.Doc,
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Requires: unused.Analyzer.Analyzer.Requires,
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Run: func(pass *analysis.Pass) (interface{}, error) {
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issues, err := runUnused(pass)
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if err != nil {
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return nil, err
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}
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if len(issues) == 0 {
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return nil, nil
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}
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mu.Lock()
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resIssues = append(resIssues, issues...)
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mu.Unlock()
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return nil, nil
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},
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}
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setAnalyzerGoVersion(analyzer, getGoVersion(settings))
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return goanalysis.NewLinter(
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unusedName,
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"Checks Go code for unused constants, variables, functions and types",
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[]*analysis.Analyzer{analyzer},
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nil,
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).WithIssuesReporter(func(lintCtx *linter.Context) []goanalysis.Issue {
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return resIssues
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}).WithLoadMode(goanalysis.LoadModeTypesInfo)
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}
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func runUnused(pass *analysis.Pass) ([]goanalysis.Issue, error) {
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res, err := unused.Analyzer.Analyzer.Run(pass)
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if err != nil {
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return nil, err
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}
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sr := unused.Serialize(pass, res.(unused.Result), pass.Fset)
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used := make(map[string]bool)
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for _, obj := range sr.Used {
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used[fmt.Sprintf("%s %d %s", obj.Position.Filename, obj.Position.Line, obj.Name)] = true
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}
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var issues []goanalysis.Issue
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// Inspired by https://github.com/dominikh/go-tools/blob/d694aadcb1f50c2d8ac0a1dd06217ebb9f654764/lintcmd/lint.go#L177-L197
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for _, object := range sr.Unused {
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if object.Kind == "type param" {
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continue
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}
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if object.InGenerated {
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continue
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}
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key := fmt.Sprintf("%s %d %s", object.Position.Filename, object.Position.Line, object.Name)
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if used[key] {
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continue
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}
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issue := goanalysis.NewIssue(&result.Issue{
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FromLinter: unusedName,
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Text: fmt.Sprintf("%s %s is unused", object.Kind, object.Name),
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Pos: object.Position,
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}, pass)
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issues = append(issues, issue)
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}
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return issues, nil
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}
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