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// Copyright 2018 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 server
import (
"bytes"
"context"
"fmt"
cueformat "cuelang.org/go/cue/format"
"cuelang.org/go/internal/golangorgx/gopls/protocol"
"cuelang.org/go/internal/golangorgx/tools/diff"
"cuelang.org/go/internal/golangorgx/tools/event"
"cuelang.org/go/internal/golangorgx/tools/event/tag"
)
// Formatting formats the params.TextDocument.URI as canonical cue.
//
// The file must be within a cue module.
//
// Formatting implements [protocol.Server]
func (s *server) Formatting(ctx context.Context, params *protocol.DocumentFormattingParams) ([]protocol.TextEdit, error) {
_, done := event.Start(ctx, "lsp.Server.formatting", tag.URI.Of(params.TextDocument.URI))
defer done()
uri := params.TextDocument.URI
mod, err := s.workspace.FindModuleForFile(uri)
if err != nil {
return nil, err
} else if mod == nil {
//lint:ignore ST1005 Errors that go back to the editor can enjoy grammar.
return nil, fmt.Errorf("No module found for %v", uri)
}
parsedFile, fh, err := mod.ReadCUEFile(uri)
if err != nil {
return nil, err
} else if parsedFile == nil {
return nil, fmt.Errorf("%v is not a CUE file", uri)
}
formatted, err := cueformat.Node(parsedFile)
if err != nil {
// TODO fix up the AST like gopls so we can do more with
// partial/incomplete code.
//
// For now return early because there is nothing we can do.
return nil, nil
}
src := fh.Content()
if bytes.Equal(formatted, src) {
return nil, nil
}
mapper := protocol.NewMapper(fh.URI(), src)
edits := diff.Strings(string(src), string(formatted))
return protocol.EditsFromDiffEdits(mapper, edits)
}
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