Method prepareFileEdit

agent/agentfiles/files.go:499–563

prepareFileEdit validates, reads, and computes edits for a single file without writing anything to disk.

(path string, edits []workspacesdk.FileEdit)

// prepareFileEdit validates, reads, and computes edits for a single
// file without writing anything to disk.
func (api *API) prepareFileEdit(path string, edits []workspacesdk.FileEdit) (int, *pendingEdit, error) {
	if path == "" {
		return http.StatusBadRequest, nil, xerrors.New("\"path\" is required")
	}

	if !filepath.IsAbs(path) {
		return http.StatusBadRequest, nil, xerrors.Errorf("file path must be absolute: %q", path)
	}

	if len(edits) == 0 {
		return http.StatusBadRequest, nil, xerrors.New("must specify at least one edit")
	}

	resolved, err := api.resolvePath(path)
	if err != nil {
		return http.StatusInternalServerError, nil, xerrors.Errorf("resolve symlink %q: %w", path, err)
	}
	origPath := path
	path = resolved

	f, err := api.filesystem.Open(path)
	if err != nil {
		status := http.StatusInternalServerError
		switch {
		case errors.Is(err, os.ErrNotExist):
			status = http.StatusNotFound
		case errors.Is(err, os.ErrPermission):
			status = http.StatusForbidden
		}
		return status, nil, err
	}
	defer f.Close()

	stat, err := f.Stat()
	if err != nil {
		return http.StatusInternalServerError, nil, err
	}

	if stat.IsDir() {
		return http.StatusBadRequest, nil, xerrors.Errorf("open %s: not a file", path)
	}

	data, err := io.ReadAll(f)
	if err != nil {
		return http.StatusInternalServerError, nil, xerrors.Errorf("read %s: %w", path, err)
	}
	content := string(data)
	oldContent := content

	for _, edit := range edits {
		var err error
		content, err = fuzzyReplace(content, edit)
		if err != nil {
			return http.StatusBadRequest, nil, xerrors.Errorf("edit %s: %w", path, err)
		}
	}

	return 0, &pendingEdit{