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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"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"golang.org/x/tools/gopls/internal/lsp/protocol"
"golang.org/x/tools/gopls/internal/lsp/source"
"golang.org/x/tools/gopls/internal/span"
"golang.org/x/tools/internal/diff"
"golang.org/x/tools/internal/tool"
)
// rename implements the rename verb for gopls.
type rename struct {
Diff bool `flag:"d,diff" help:"display diffs instead of rewriting files"`
Write bool `flag:"w,write" help:"write result to (source) file instead of stdout"`
Preserve bool `flag:"preserve" help:"preserve original files"`
app *Application
}
func (r *rename) Name() string { return "rename" }
func (r *rename) Parent() string { return r.app.Name() }
func (r *rename) Usage() string { return "[rename-flags] <position> <name>" }
func (r *rename) ShortHelp() string { return "rename selected identifier" }
func (r *rename) DetailedHelp(f *flag.FlagSet) {
fmt.Fprint(f.Output(), `
Example:
$ # 1-based location (:line:column or :#position) of the thing to change
$ gopls rename helper/helper.go:8:6 Foo
$ gopls rename helper/helper.go:#53 Foo
rename-flags:
`)
printFlagDefaults(f)
}
// Run renames the specified identifier and either;
// - if -w is specified, updates the file(s) in place;
// - if -d is specified, prints out unified diffs of the changes; or
// - otherwise, prints the new versions to stdout.
func (r *rename) Run(ctx context.Context, args ...string) error {
if len(args) != 2 {
return tool.CommandLineErrorf("definition expects 2 arguments (position, new name)")
}
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.RenameParams{
TextDocument: protocol.TextDocumentIdentifier{URI: loc.URI},
Position: loc.Range.Start,
NewName: args[1],
}
edit, err := conn.Rename(ctx, &p)
if err != nil {
return err
}
var orderedURIs []string
edits := map[span.URI][]protocol.TextEdit{}
for _, c := range edit.DocumentChanges {
if c.TextDocumentEdit != nil {
uri := fileURI(c.TextDocumentEdit.TextDocument.URI)
edits[uri] = append(edits[uri], c.TextDocumentEdit.Edits...)
orderedURIs = append(orderedURIs, string(uri))
}
}
sort.Strings(orderedURIs)
changeCount := len(orderedURIs)
for _, u := range orderedURIs {
uri := span.URIFromURI(u)
cmdFile := conn.openFile(ctx, uri)
filename := cmdFile.uri.Filename()
newContent, renameEdits, err := source.ApplyProtocolEdits(cmdFile.mapper, edits[uri])
if err != nil {
return fmt.Errorf("%v: %v", edits, err)
}
switch {
case r.Write:
fmt.Fprintln(os.Stderr, filename)
if r.Preserve {
if err := os.Rename(filename, filename+".orig"); err != nil {
return fmt.Errorf("%v: %v", edits, err)
}
}
ioutil.WriteFile(filename, newContent, 0644)
case r.Diff:
unified, err := diff.ToUnified(filename+".orig", filename, string(cmdFile.mapper.Content), renameEdits)
if err != nil {
return err
}
fmt.Print(unified)
default:
if len(orderedURIs) > 1 {
fmt.Printf("%s:\n", filepath.Base(filename))
}
os.Stdout.Write(newContent)
if changeCount > 1 { // if this wasn't last change, print newline
fmt.Println()
}
changeCount -= 1
}
}
return nil
}
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