mirror of https://github.com/golang/go.git
114 lines
3.0 KiB
Go
114 lines
3.0 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cmd
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import (
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"context"
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"flag"
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"fmt"
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"io/ioutil"
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"golang.org/x/tools/internal/lsp/diff"
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"golang.org/x/tools/internal/lsp/protocol"
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"golang.org/x/tools/internal/lsp/source"
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"golang.org/x/tools/internal/span"
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"golang.org/x/tools/internal/tool"
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errors "golang.org/x/xerrors"
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)
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// suggestedfix implements the fix verb for gopls.
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type suggestedfix struct {
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Diff bool `flag:"d" help:"display diffs instead of rewriting files"`
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Write bool `flag:"w" help:"write result to (source) file instead of stdout"`
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All bool `flag:"a" help:"apply all fixes, not just preferred fixes"`
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app *Application
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}
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func (s *suggestedfix) Name() string { return "fix" }
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func (s *suggestedfix) Usage() string { return "<filename>" }
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func (s *suggestedfix) ShortHelp() string { return "apply suggested fixes" }
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func (s *suggestedfix) DetailedHelp(f *flag.FlagSet) {
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fmt.Fprintf(f.Output(), `
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Example: apply suggested fixes for this file:
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$ gopls fix -w internal/lsp/cmd/check.go
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gopls fix flags are:
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`)
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f.PrintDefaults()
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}
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// Run performs diagnostic checks on the file specified and either;
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// - if -w is specified, updates the file in place;
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// - if -d is specified, prints out unified diffs of the changes; or
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// - otherwise, prints the new versions to stdout.
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func (s *suggestedfix) Run(ctx context.Context, args ...string) error {
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if len(args) != 1 {
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return tool.CommandLineErrorf("fix expects 1 argument")
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}
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conn, err := s.app.connect(ctx)
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if err != nil {
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return err
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}
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defer conn.terminate(ctx)
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from := span.Parse(args[0])
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uri := from.URI()
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file := conn.AddFile(ctx, uri)
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if file.err != nil {
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return file.err
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}
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if err := conn.diagnoseFiles(ctx, []span.URI{uri}); err != nil {
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return err
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}
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p := protocol.CodeActionParams{
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TextDocument: protocol.TextDocumentIdentifier{
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URI: protocol.NewURI(uri),
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},
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Context: protocol.CodeActionContext{
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Only: []protocol.CodeActionKind{protocol.QuickFix},
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Diagnostics: file.diagnostics,
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},
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}
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actions, err := conn.CodeAction(ctx, &p)
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if err != nil {
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return errors.Errorf("%v: %v", from, err)
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}
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var edits []protocol.TextEdit
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for _, a := range actions {
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if !a.IsPreferred && !s.All {
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continue
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}
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for _, c := range a.Edit.DocumentChanges {
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if c.TextDocument.URI == string(uri) {
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edits = append(edits, c.Edits...)
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}
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}
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}
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sedits, err := source.FromProtocolEdits(file.mapper, edits)
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if err != nil {
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return errors.Errorf("%v: %v", edits, err)
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}
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newContent := diff.ApplyEdits(string(file.mapper.Content), sedits)
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filename := file.uri.Filename()
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switch {
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case s.Write:
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if len(edits) > 0 {
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ioutil.WriteFile(filename, []byte(newContent), 0644)
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}
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case s.Diff:
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diffs := diff.ToUnified(filename+".orig", filename, string(file.mapper.Content), sedits)
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fmt.Print(diffs)
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default:
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fmt.Print(string(newContent))
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}
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return nil
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}
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