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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"
"sort"
"golang.org/x/tools/gopls/internal/lsp/protocol"
"golang.org/x/tools/gopls/internal/span"
"golang.org/x/tools/internal/tool"
)
// references implements the references verb for gopls
type references struct {
IncludeDeclaration bool `flag:"d,declaration" help:"include the declaration of the specified identifier in the results"`
app *Application
}
func (r *references) Name() string { return "references" }
func (r *references) Parent() string { return r.app.Name() }
func (r *references) Usage() string { return "[references-flags] <position>" }
func (r *references) ShortHelp() string { return "display selected identifier's references" }
func (r *references) DetailedHelp(f *flag.FlagSet) {
fmt.Fprint(f.Output(), `
Example:
$ # 1-indexed location (:line:column or :#offset) of the target identifier
$ gopls references helper/helper.go:8:6
$ gopls references helper/helper.go:#53
references-flags:
`)
printFlagDefaults(f)
}
func (r *references) Run(ctx context.Context, args ...string) error {
if len(args) != 1 {
return tool.CommandLineErrorf("references expects 1 argument (position)")
}
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.ReferenceParams{
Context: protocol.ReferenceContext{
IncludeDeclaration: r.IncludeDeclaration,
},
TextDocumentPositionParams: protocol.LocationTextDocumentPositionParams(loc),
}
locations, err := conn.References(ctx, &p)
if err != nil {
return err
}
var spans []string
for _, l := range locations {
f := conn.openFile(ctx, fileURI(l.URI))
// convert location to span for user-friendly 1-indexed line
// and column numbers
span, err := f.mapper.LocationSpan(l)
if err != nil {
return err
}
spans = append(spans, fmt.Sprint(span))
}
sort.Strings(spans)
for _, s := range spans {
fmt.Println(s)
}
return nil
}
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