bookmark-completing-readbookmark-completing-read is a compiled Lisp function in `
bookmark.el'. (bookmark-completing-read PROMPT &optional DEFAULT) Prompting with PROMPT, read a bookmark name in completion. PROMPT will get a ": " stuck on the end no matter what, so you probably don't want to include one yourself. Optional arg DEFAULT is a string to return if the user input is empty. If DEFAULT is nil then return empty string for empty input.