#+TITLE: ElDoc box
This package displays ElDoc documentations in a childframe.

#+CAPTION: Using with eglot in python-mode
[[./screenshot.png]]

* Install
Get the file, add to load path, and
#+BEGIN_SRC emacs-lisp
(require 'eldoc-box)
#+END_SRC
* Usage
** Function
Enable either mode will make eldoc display documentation on a popup childframe. The difference is the position of the childframe — the first minor mode displays the childframe on the (left or right) upper corner, while the second displays the childframe right below point.

Note that =eldoc-box-hover-at-point-mode= enables =eldoc-box-hover-mode= — it just adds some more configuration on top of the latter, so you want to disable “at-point” mode before switching to =eldoc-box-hover-mode=.

- =eldoc-box-hover-mode= :: Display documentation of the symbol at point in a childframe on upper corner.
- =eldoc-box-hover-at-point-mode= :: Display documentation of the symbol at point in a childframe below point. (That's what the =at-point= part mean)
** Face
-  =eldoc-box-border= :: Adjust =:background= of this face for border color.
- =eldoc-box-body= :: Adjust =:background= and =:font= of  this face for background color and font of the childframe. I suggest to use a nice Sans Serif font, such as Source Sans Pro.
** Variable
- =eldoc-box-max-pixel-width= & =eldoc-box-max-pixel-height= :: Set them according to the screen resolution of your machine.
- =eldoc-box-only-multi-line= :: Set this to non-nil and eldoc-box only display multi-line message in childframe. One line messages are left in minibuffer.
- =eldoc-box-cleanup-interval= :: After this amount of seconds will eldoc-box attempt to cleanup the childframe. E.g. if it is set to 1, the childframe is cleared 1 second after you moved the point to somewhere else (that doesn't have a doc to show). This doesn't apply to =eldoc-box-hover-at-point-mode=, in that mode the childframe is cleared as soon as point moves.
** Use with eglot
As of writing this README, eglot doesn't have a public mode hook, use this hook:
#+BEGIN_SRC emacs-lisp
(add-hook 'eglot--managed-mode-hook #'eldoc-box-hover-mode t)
#+END_SRC
** Help at point hack
If all you need is a "help at point" popup to be used with eglot, here is my hack. You don't need to enable any minor mode, just call this command on the symbol. (In fact, I don’t even use =eldoc-box-hover-mode= anymore. I bind this hack to =C-h C-h= and lived happily ever after.)
#+BEGIN_SRC emacs-lisp
(defun eldoc-box-hack-cleanup ()
  "Try to clean up the childframe made by eldoc-box hack."
  (if (eq (point) eldoc-box-hack-last-point)
      (run-with-timer 0.1 nil #'eldoc-box-hack-cleanup)
    (eldoc-box-quit-frame)))

(defun moon-help-at-point ()
  (interactive)
  (when eglot--managed-mode
    (require 'eldoc-box)
    (let ((eldoc-box-position-function #'eldoc-box--default-at-point-position-function))
      (eldoc-box--display
       (eglot--dbind ((Hover) contents range)
           (jsonrpc-request (eglot--current-server-or-lose) :textDocument/hover
                            (eglot--TextDocumentPositionParams))
         (when (seq-empty-p contents) (eglot--error "No hover info here"))
         (eglot--hover-info contents range))))
    (setq eldoc-box-hack-last-point (point))
    (run-with-timer 0.1 nil #'eldoc-box-hack-cleanup)))
#+END_SRC

* Contributors
- [[https://github.com/joaotavora][João Távora]]