Re: [PATCH] commit: make default of "cleanup" option configurable

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Hi,

2013/1/9 Jonathan Nieder <jrnieder@xxxxxxxxx>:
> Hi,
>
> Ralf Thielow wrote:
>
>> The default of the "cleanup" option in "git commit"
>> is not configurable. Users who don't want to use the
>> default have to pass this option on every commit since
>> there's no way to configure it.
>
> Could you give an example?  I'm trying to get a sense of whether these
> habitual --cleanup= passers would use --cleanup=verbatim or
> --cleanup=strip.
>

It's actually my own usecase :). The bugtracker I'm using is able
to create relationships between issues and related commits. It
expects that a part of the commit message contains the issue number
in format "#<issueId>". So I need to use a cleanup mode different
from "default" to keep the commentary. The mode I'd use is "whitespace",
"verbatim" is also possible.

> I'm a bit worried that a setting like 'commit.cleanup = strip' would
> be likely to break scripts.  Yes, scripts using "git commit" instead
> of commit-tree while caring about detailed semantics are asking for
> trouble, but I'm worried about importers, for example, which are
> sometimes written by new git users.  Some scripts might assume that
> "git commit" preserves the entire change description from their source
> data, even when some lines happen to start by listing the ways the
> author is #1.
>

When a user uses a script/importer which expects that the "default" option
is used without setting it explicitly, and then the user changes the default,
isn't it the users fault if that would break things?

> I don't think that necessarily rules out this change, but:
>
>  1. We need more of an explanation of the purpose than "this lets
>     people type less".  What workflow does setting this option fit
>     into?
>
>  2. I would prefer to see a little thought about whether it's possible
>     to avoid silently impacting scripts.  E.g., depending on the
>     answer to (1), maybe supporting "verbatim" but not "strip" would be
>     ok?  Or alternatively, maybe a search of public code repositories
>     would reveal that new git users tend to write their importers in a
>     way that this doesn't break.
>
> As a side effect, the information gathered to answer (1) and (2) could
> have the potential to make the user-level documentation more useful,
> by adding context to the description of the configuration item.
>

I'll add a sentence of my bugtracker example to it. I think many developers
are using such a tool, so it'd makes sense.

> [...]
>> --- a/builtin/commit.c
>> +++ b/builtin/commit.c
>> @@ -103,7 +103,7 @@ static enum {
>>       CLEANUP_NONE,
>>       CLEANUP_ALL
>>  } cleanup_mode;
>> -static char *cleanup_arg;
>> +const static char *cleanup_arg;
>
> Style nit: storage class comes first, then the type.  Otherwise the
> typename "const char *" is split up.
>

Thanks.
I'll send a new version of the patch including changes of your and
Junios comments.

Ralf
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