todo-read-file-name
todo-read-file-name is a compiled Lisp function in `todo-mode.el
'.
(todo-read-file-name PROMPT &optional ARCHIVE MUSTMATCH)
Choose and return the name of a todo file, prompting with PROMPT.
Show completions with TAB or SPC; the names are shown in short
form but the absolute truename is returned. With non-nil ARCHIVE
return the absolute truename of a todo archive file. With non-nil
MUSTMATCH the name of an existing file must be chosen;
otherwise, a new file name is allowed.