129 lines
3.1 KiB
Go
129 lines
3.1 KiB
Go
package golinters
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"sync"
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"github.com/pkg/errors"
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"github.com/shazow/go-diff/difflib"
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"golang.org/x/tools/go/analysis"
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"mvdan.cc/gofumpt/format"
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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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)
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const gofumptName = "gofumpt"
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type differ interface {
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Diff(out io.Writer, a io.ReadSeeker, b io.ReadSeeker) error
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}
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func NewGofumpt(settings *config.GofumptSettings) *goanalysis.Linter {
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var mu sync.Mutex
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var resIssues []goanalysis.Issue
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diff := difflib.New()
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var options format.Options
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if settings != nil {
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options = format.Options{
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LangVersion: getLangVersion(settings),
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ModulePath: settings.ModulePath,
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ExtraRules: settings.ExtraRules,
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}
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}
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analyzer := &analysis.Analyzer{
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Name: gofumptName,
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Doc: goanalysis.TheOnlyanalyzerDoc,
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Run: goanalysis.DummyRun,
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}
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return goanalysis.NewLinter(
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gofumptName,
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"Gofumpt checks whether code was gofumpt-ed.",
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[]*analysis.Analyzer{analyzer},
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nil,
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).WithContextSetter(func(lintCtx *linter.Context) {
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analyzer.Run = func(pass *analysis.Pass) (interface{}, error) {
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issues, err := runGofumpt(lintCtx, pass, diff, options)
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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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}).WithIssuesReporter(func(*linter.Context) []goanalysis.Issue {
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return resIssues
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}).WithLoadMode(goanalysis.LoadModeSyntax)
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}
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func runGofumpt(lintCtx *linter.Context, pass *analysis.Pass, diff differ, options format.Options) ([]goanalysis.Issue, error) {
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var fileNames []string
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for _, f := range pass.Files {
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pos := pass.Fset.PositionFor(f.Pos(), false)
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fileNames = append(fileNames, pos.Filename)
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}
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var issues []goanalysis.Issue
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for _, f := range fileNames {
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input, err := os.ReadFile(f)
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if err != nil {
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return nil, fmt.Errorf("unable to open file %s: %w", f, err)
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}
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output, err := format.Source(input, options)
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if err != nil {
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return nil, fmt.Errorf("error while running gofumpt: %w", err)
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}
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if !bytes.Equal(input, output) {
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out := bytes.Buffer{}
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_, err = out.WriteString(fmt.Sprintf("--- %[1]s\n+++ %[1]s\n", f))
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if err != nil {
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return nil, fmt.Errorf("error while running gofumpt: %w", err)
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}
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err = diff.Diff(&out, bytes.NewReader(input), bytes.NewReader(output))
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if err != nil {
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return nil, fmt.Errorf("error while running gofumpt: %w", err)
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}
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diff := out.String()
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is, err := extractIssuesFromPatch(diff, lintCtx, gofumptName)
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if err != nil {
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return nil, errors.Wrapf(err, "can't extract issues from gofumpt diff output %q", diff)
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}
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for i := range is {
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issues = append(issues, goanalysis.NewIssue(&is[i], pass))
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}
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}
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}
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return issues, nil
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}
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func getLangVersion(settings *config.GofumptSettings) string {
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if settings == nil || settings.LangVersion == "" {
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// TODO: defaults to "1.15", in the future (v2) must be set by using build.Default.ReleaseTags like staticcheck.
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return "1.15"
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}
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return settings.LangVersion
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}
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