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Re: Why post-command-hook so difficult to debug?

From: Tassilo Horn
Subject: Re: Why post-command-hook so difficult to debug?
Date: Fri, 24 Aug 2012 08:11:13 +0200
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.2.50 (gnu/linux)

Leo <address@hidden> writes:

> On 2012-08-24 02:37 +0800, Tassilo Horn wrote:
>> Anyway, could you please elaborate what was the 100 miles away function
>> in your case?  Maybe it's similar here...
> Check the entries in completion-at-point-functions.

| completion-at-point-functions is a variable defined in `minibuffer.el'.
| Its value is (nrepl-complete-at-point tags-completion-at-point-function)

`nrepl-complete-at-point' is the completion at point function I've just
written.  To my best understanding and debugging, it always returns
completely valid


triples or nil if there's no completion.  The definition is

--8<---------------cut here---------------start------------->8---
(defun nrepl-complete-at-point ()
  (let ((sap (symbol-at-point)))
    (when (and sap (not (in-string-p)))
      (nrepl-send-string "(require 'complete.core)" "user" 'identity)
      (let ((form (format "(complete.core/completions \"%s\" *ns*)" sap))
            (bounds (bounds-of-thing-at-point 'symbol)))
        (let ((completions (car (read-from-string
                                 (plist-get (nrepl-send-string-sync form 
          (when completions
            (list (car bounds) (cdr bounds) completions)))))))
--8<---------------cut here---------------end--------------->8---

For example, I have (ide|) in my clojure buffer and try to complete (|
is point, here).  The function returns

  (1232 1235 ("identical?" "identity"))

and the common prefix is completed: (identi).  Then, my function is
immediately ran again (why?) and my function returns

  (1232 1238 ("identical?" "identity"))

1235 and 1238 are the current location of point in these examples.

I tried removing `tags-completion-at-point-function' from
`completion-at-point-functions' but the error persists.  So it seems I'm
the culprit although I cannot spot the problem...


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