RE: completion-auto-help

[Drew Adams]

        > gets called inside `completing-read', upon insertion, but I
        > see no way to get `completing-read' to display *Completions*
        > without any user action.

        IIRC you can do it from minibuffer-setup-hook.

    I've tried that. This is not about minibuffer setup, and it's not about
    completion-list setup (for which there is also a hook). This is about
    _completion_ setup.

    I believe that what's needed is a hook that kicks in as soon as
    completing-read (and read-file-name...) displays its prompt
    (just before or
    after). That hook doesn't exist.


My bad. I did try `minibuffer-setup-hook' previously with no luck, but I
must not have done things correctly. I just retried, and it does what I want
in this regard.

 (add-hook 'minibuffer-setup-hook 'show-it)

 (defun show-it ()
    "Show *Completions* on empty input."
    (with-output-to-temp-buffer "*Completions*"
      (display-completion-list (all-completions "" my-completions)))