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Doing C-h f looks up the help for a function in emacs, and by clicking the link in the help box I can go to the source.

Is there a way to go from the function help window to info, searching specifically for the chapter that function is documented in.

Or if not a way to quickly search info for the selected function name.

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up vote 1 down vote accepted

The command you're looking for is Info-goto-emacs-command-node, bound to C-h F. Unfortunately there doesn't seem to be any integration between the two different forms of documentation.

This is a bit rough, but drop this in your .emacs file and from the C-h f documentation for a function you'll be able to hit i ("info") to jump to the corresponding C-h F documentation.

(defun Info-goto-from-command-help ()
  "Go to the Info node in the Emacs manual for the command
currently being viewed in `help-mode'."
  (when (eq 'describe-function (car help-xref-stack-item))
    (Info-goto-emacs-command-node (cadr help-xref-stack-item))))

(define-key help-mode-map "i" 'Info-goto-from-command-help)
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That's neat thanks! I add this condition to the when ... (commandp (cadr help-xref-stack-item))) because it wasn't working for me initially and I didn't realize that it works only for interactive commands. – justinhj Aug 25 '12 at 17:01
Original question asked for function definition. Info-goto-emacs-command-node works only for, you guessed it, commands. – Jürgen A. Erhard Nov 25 '12 at 21:46

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