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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"
"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"
)
// format implements the format verb for gopls.
type format 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"`
List bool `flag:"l,list" help:"list files whose formatting differs from gofmt's"`
app *Application
}
func (c *format) Name() string { return "format" }
func (c *format) Parent() string { return c.app.Name() }
func (c *format) Usage() string { return "[format-flags] <filerange>" }
func (c *format) ShortHelp() string { return "format the code according to the go standard" }
func (c *format) DetailedHelp(f *flag.FlagSet) {
fmt.Fprint(f.Output(), `
The arguments supplied may be simple file names, or ranges within files.
Example: reformat this file:
$ gopls format -w internal/lsp/cmd/check.go
format-flags:
`)
printFlagDefaults(f)
}
// Run performs the check on the files specified by args and prints the
// results to stdout.
func (c *format) Run(ctx context.Context, args ...string) error {
if len(args) == 0 {
// no files, so no results
return nil
}
// now we ready to kick things off
conn, err := c.app.connect(ctx)
if err != nil {
return err
}
defer conn.terminate(ctx)
for _, arg := range args {
spn := span.Parse(arg)
file := conn.openFile(ctx, spn.URI())
if file.err != nil {
return file.err
}
filename := spn.URI().Filename()
loc, err := file.mapper.SpanLocation(spn)
if err != nil {
return err
}
if loc.Range.Start != loc.Range.End {
return fmt.Errorf("only full file formatting supported")
}
p := protocol.DocumentFormattingParams{
TextDocument: protocol.TextDocumentIdentifier{URI: loc.URI},
}
edits, err := conn.Formatting(ctx, &p)
if err != nil {
return fmt.Errorf("%v: %v", spn, err)
}
formatted, sedits, err := source.ApplyProtocolEdits(file.mapper, edits)
if err != nil {
return fmt.Errorf("%v: %v", spn, err)
}
printIt := true
if c.List {
printIt = false
if len(edits) > 0 {
fmt.Println(filename)
}
}
if c.Write {
printIt = false
if len(edits) > 0 {
ioutil.WriteFile(filename, formatted, 0644)
}
}
if c.Diff {
printIt = false
unified, err := diff.ToUnified(filename+".orig", filename, string(file.mapper.Content), sedits)
if err != nil {
return err
}
fmt.Print(unified)
}
if printIt {
os.Stdout.Write(formatted)
}
}
return nil
}
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