Is there a package to get a popup of the documentation for the thing at the point?
Here's an example that flycheck uses.
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Don't know what kind of documentation you want, I use the following to display a short summary of elisp function/variable's docstring with popup:
(defun chunyang-elisp-function-or-variable-quickhelp (symbol) "Display summary of function or variable at point. Adapted from `describe-function-or-variable'." (interactive (let* ((v-or-f (variable-at-point)) (found (symbolp v-or-f)) (v-or-f (if found v-or-f (function-called-at-point)))) (list v-or-f))) (if (not (and symbol (symbolp symbol))) (message "You didn't specify a function or variable") (let* ((fdoc (when (fboundp symbol) (or (documentation symbol t) "Not documented."))) (fdoc-short (and (stringp fdoc) (substring fdoc 0 (string-match "\n" fdoc)))) (vdoc (when (boundp symbol) (or (documentation-property symbol 'variable-documentation t) "Not documented as a variable."))) (vdoc-short (and (stringp vdoc) (substring vdoc 0 (string-match "\n" vdoc))))) (and (require 'popup nil 'no-error) (popup-tip (or (and fdoc-short vdoc-short (concat fdoc-short "\n\n" (make-string 30 ?-) "\n" (symbol-name symbol) " is also a " "variable." "\n\n" vdoc-short)) fdoc-short vdoc-short) :margin t)))))
Here is what it looks like: