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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"
"encoding/json"
"flag"
"fmt"
"os"
"golang.org/x/tools/gopls/internal/protocol"
"golang.org/x/tools/internal/tool"
)
// links implements the links verb for gopls.
type links struct {
JSON bool `flag:"json" help:"emit document links in JSON format"`
app *Application
}
func (l *links) Name() string { return "links" }
func (l *links) Parent() string { return l.app.Name() }
func (l *links) Usage() string { return "[links-flags] <filename>" }
func (l *links) ShortHelp() string { return "list links in a file" }
func (l *links) DetailedHelp(f *flag.FlagSet) {
fmt.Fprintf(f.Output(), `
Example: list links contained within a file:
$ gopls links internal/cmd/check.go
links-flags:
`)
printFlagDefaults(f)
}
// Run finds all the links within a document
// - if -json is specified, outputs location range and uri
// - otherwise, prints the a list of unique links
func (l *links) Run(ctx context.Context, args ...string) error {
if len(args) != 1 {
return tool.CommandLineErrorf("links expects 1 argument")
}
conn, err := l.app.connect(ctx)
if err != nil {
return err
}
defer conn.terminate(ctx)
from := parseSpan(args[0])
uri := from.URI()
if _, err := conn.openFile(ctx, uri); err != nil {
return err
}
results, err := conn.DocumentLink(ctx, &protocol.DocumentLinkParams{
TextDocument: protocol.TextDocumentIdentifier{
URI: uri,
},
})
if err != nil {
return fmt.Errorf("%v: %v", from, err)
}
if l.JSON {
enc := json.NewEncoder(os.Stdout)
enc.SetIndent("", "\t")
return enc.Encode(results)
}
for _, v := range results {
fmt.Println(*v.Target)
}
return nil
}
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