blob: 19a53dc312b84cd0df0c655ae95b6b2a97672d6c [file] [log] [blame]
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cmd
import (
"context"
"flag"
"fmt"
"io/ioutil"
"golang.org/x/tools/internal/lsp/diff"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/span"
"golang.org/x/tools/internal/tool"
errors "golang.org/x/xerrors"
)
// suggestedfix implements the fix verb for gopls.
type suggestedfix struct {
Diff bool `flag:"d" help:"display diffs instead of rewriting files"`
Write bool `flag:"w" help:"write result to (source) file instead of stdout"`
All bool `flag:"a" help:"apply all fixes, not just preferred fixes"`
app *Application
}
func (s *suggestedfix) Name() string { return "fix" }
func (s *suggestedfix) Usage() string { return "<filename>" }
func (s *suggestedfix) ShortHelp() string { return "apply suggested fixes" }
func (s *suggestedfix) DetailedHelp(f *flag.FlagSet) {
fmt.Fprintf(f.Output(), `
Example: apply suggested fixes for this file:
  $ gopls fix -w internal/lsp/cmd/check.go
gopls fix flags are:
`)
f.PrintDefaults()
}
// Run performs diagnostic checks on the file specified and either;
// - if -w is specified, updates the file in place;
// - if -d is specified, prints out unified diffs of the changes; or
// - otherwise, prints the new versions to stdout.
func (s *suggestedfix) Run(ctx context.Context, args ...string) error {
if len(args) != 1 {
return tool.CommandLineErrorf("fix expects 1 argument")
}
conn, err := s.app.connect(ctx)
if err != nil {
return err
}
defer conn.terminate(ctx)
from := span.Parse(args[0])
uri := from.URI()
file := conn.AddFile(ctx, uri)
if file.err != nil {
return file.err
}
if err := conn.diagnoseFiles(ctx, []span.URI{uri}); err != nil {
return err
}
conn.Client.filesMu.Lock()
defer conn.Client.filesMu.Unlock()
p := protocol.CodeActionParams{
TextDocument: protocol.TextDocumentIdentifier{
URI: protocol.NewURI(uri),
},
Context: protocol.CodeActionContext{
Only: []protocol.CodeActionKind{protocol.QuickFix},
Diagnostics: file.diagnostics,
},
}
actions, err := conn.CodeAction(ctx, &p)
if err != nil {
return errors.Errorf("%v: %v", from, err)
}
var edits []protocol.TextEdit
for _, a := range actions {
if !a.IsPreferred && !s.All {
continue
}
for _, c := range a.Edit.DocumentChanges {
if c.TextDocument.URI == string(uri) {
edits = append(edits, c.Edits...)
}
}
}
sedits, err := source.FromProtocolEdits(file.mapper, edits)
if err != nil {
return errors.Errorf("%v: %v", edits, err)
}
newContent := diff.ApplyEdits(string(file.mapper.Content), sedits)
filename := file.uri.Filename()
switch {
case s.Write:
if len(edits) > 0 {
ioutil.WriteFile(filename, []byte(newContent), 0644)
}
case s.Diff:
diffs := diff.ToUnified(filename+".orig", filename, string(file.mapper.Content), sedits)
fmt.Print(diffs)
default:
fmt.Print(string(newContent))
}
return nil
}