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Date: Sun, 17 Jul 2011 00:10:54 +0400
From: Aleksey Cherepanov <>
Subject: Re: coding styles for c/c++? indenter? emacs settings?

I forgot... It is also possible to fix indent to understand casts, to
support if/for/... with fully shared body, to have predefined settings
set for Openwall and so on. May be it will be harder than to write
special indenter. Also indent's application is limited to c code.

Aleksey Cherepanov

2011/7/16, Aleksey Cherepanov <>:
>> This is a very good page IMO:
> Thanks! It looks interesting. By the way I saw that uncrustify
> (indenter) had an option for such indentation.
>> I use emacs and settings that are included (or linked) in that page
>> but I believe they mention how to get the same result for other
>> editors too.
> Yes, there are links about similar indentation for other editors: Vim,
> IntelliJ IDEA and Anjuta.
>> I use a tab width of 4, but because of the basic idea of "tabs for
>> indentation, spaces for alignment", anyone reading my code with *any*
>> other tab setting will get it right.
> I think it may be bad with long lines when change of tab width from 4 to
> 8 makes some lines too long.
> Currently I stoped with Qt style (was not approved by Shinnok yet) and 2
> additional settings for emacs:
> (c-set-style "stroustrup")
> (setq indent-tabs-mode nil)
> I reformatted existing Johnny's code with Qt style so I think I will
> stop searching indenter. However I think it is important to have
> indenter that can do indentation perfectly. May be i will come back to
> that later. Now I just say what I tried and what ideas I have.
> For Qt style I found that there are settings for emacs and Vim in kdesdk
> package. I did not try emacs settings. But I tried Vim settings thinking
> about non-interactive mode. I tried `ex -c 'args *.cpp *.h' -c 'argdo
> exe "normal! gg=G" | update' -c 'q'` with different settings. But such
> way provide only indentation but does not provide formatting ('a+b' ->
> 'a + b', 'if (a)\n{' -> 'if (a) {'). I think it is possible to make Vim
> do formatting. But settings from kdesdk seems to lack this feature.
> I tried astyle and bcpp. In my opinion they are not enough flexible for
> Openwall style.
> But i found uncrustify that seems to me to be more flexible. However I
> did not try it good because it has too many options to read about.
> I found UniversalIndentGui that is suitable for trying different
> indenters by hands. It has somewhat big list of supported indenters that
> could be interesting to check.
> I think it is possible to bruteforce indenter settings to obtain
> autoindented code that is close to code indented by hands. If we have
> alot of code indented by hands we try to indent it with indenter with
> each settings set and remember lengths of diffs. Settings set that has
> smallest diff is that we want. However set of settings sets are too
> big. So we could try only one setting and check lengths with and without
> that option. If diff with setting is smaller than diff without that
> option then setting is needed. This way also have problems. For instance
> if all strings should be affected by two options and without one of them
> diff's sizes are equal. I guess that when we have alot of code it should
> not occur. This method avoids a need to know about each option indenter
> has but needs some coding.
> I guess that probably some indenters can do it itself. I did not see
> any. May be they use other logic to detect style.
> Another way is to write special indenter for only Openwall style with
> hardcoded logic. It is the most flexible way and may be the only 100%
> solution but it seems to be the most hard way too. I think it is
> possible to use a full parser from any modular program that deals with
> code in smart fashion. I think that very possible that only compilers
> are so smart. For instance clang could be used.
> Of course these are only thoughts now.
> Regards,
> Aleksey Cherepanov

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