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bug#18265: 24.3.92; lisp-completion-at-point should return nil in commen

From: Dmitry Gutov
Subject: bug#18265: 24.3.92; lisp-completion-at-point should return nil in comments, unless after `
Date: Fri, 15 Aug 2014 07:13:04 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0

On 08/15/2014 07:04 AM, Stefan Monnier wrote:

Good point.  Makes me wonder how to extend completion-at-point-functions
such that a function like lisp-completion-at-point could behave
differently for something like Company (which calls it without the user
making an explicit completion request) than for an explicit M-TAB.

Sometimes the user makes an explicit request, though. So it's "idle mode vs manual mode", not "Company vs complete-symbol".

Still, the fact that user called `M-x company-complete' inside a comment doesn't tell me that they actually want to see completions from `company-capf' and not some other backend like `company-dabbrev'.

Likewise, user pressing C-M-i inside a comment might prefer not to talk `lisp-completion-at-point', but some other completion function that goes after it that's more suited for completion in comments.

If we really want to use `lisp-completion-at-point' in comments in more cases, I'd try to detect whether we're probably in a code sample (by the extra indentation, maybe), and otherwise return nil.

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