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// 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"
"errors"
"flag"
"fmt"
"golang.org/x/tools/gopls/internal/lsp/protocol"
"golang.org/x/tools/gopls/internal/span"
"golang.org/x/tools/internal/tool"
)
// prepareRename implements the prepare_rename verb for gopls.
type prepareRename struct {
app *Application
}
func (r *prepareRename) Name() string { return "prepare_rename" }
func (r *prepareRename) Parent() string { return r.app.Name() }
func (r *prepareRename) Usage() string { return "<position>" }
func (r *prepareRename) ShortHelp() string { return "test validity of a rename operation at location" }
func (r *prepareRename) DetailedHelp(f *flag.FlagSet) {
fmt.Fprint(f.Output(), `
Example:
$ # 1-indexed location (:line:column or :#offset) of the target identifier
$ gopls prepare_rename helper/helper.go:8:6
$ gopls prepare_rename helper/helper.go:#53
`)
printFlagDefaults(f)
}
// ErrInvalidRenamePosition is returned when prepareRename is run at a position that
// is not a candidate for renaming.
var ErrInvalidRenamePosition = errors.New("request is not valid at the given position")
func (r *prepareRename) Run(ctx context.Context, args ...string) error {
if len(args) != 1 {
return tool.CommandLineErrorf("prepare_rename expects 1 argument (file)")
}
conn, err := r.app.connect(ctx)
if err != nil {
return err
}
defer conn.terminate(ctx)
from := span.Parse(args[0])
file := conn.openFile(ctx, from.URI())
if file.err != nil {
return file.err
}
loc, err := file.mapper.SpanLocation(from)
if err != nil {
return err
}
p := protocol.PrepareRenameParams{
TextDocumentPositionParams: protocol.LocationTextDocumentPositionParams(loc),
}
result, err := conn.PrepareRename(ctx, &p)
if err != nil {
return fmt.Errorf("prepare_rename failed: %w", err)
}
if result == nil {
return ErrInvalidRenamePosition
}
s, err := file.mapper.RangeSpan(result.Range)
if err != nil {
return err
}
fmt.Println(s)
return nil
}
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