Re: [PATCH/RFC 0/9] add long forms for format placeholders

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Junio C Hamano venit, vidit, dixit 29.03.2011 02:28:
> Will Palmer <wmpalmer@xxxxxxxxx> writes:
> 
>> I've been kicking around this series for a while now as part of a larger
>> effort of refactoring the pretty formats. A recent discussion on the
>> list has lead me to believe that this smaller subset may be of use
>> sooner, rather than later.
>>
>> This series attempts to add "long forms" for common format placeholders
>> in the "git log" family of commands, making the way for yet more
>> placeholders to be added without needing to worry too much about the
>> increasingly limited set of available one-letter mnemonics. It also
>> moves towards the possibility of eventual unification with the format
>> options in for-each-ref.
> 
> I don't claim that I read 1300+ long [PATCH 5/9] carefully, but I like the
> direction in which this topic is going very much.
> 
> Except that [PATCH 2/9] looked quite out of place---more like "I wanted to
> sneak this feature in" than "this was needed to keep the resulting code
> backward compatible" or anything like that.
> 
> Off the top of my head, I don't think of a reason to say that [PATCH 3/9]
> is going in a wrong direction---is there a reason to make you worried in
> the particular change?

I'm wondering how much of this could and should be shared with
for-each-ref. Notable differences that I'm aware of:

- for-each-ref is about (named) refs which can point to any type of
object; rev-list/log is about commit objects

- for-each-ref deals with "few" objects typically, rev-list/log with many

So, other than %(refname), %(upstream) and %(tagger...), all
for-each-ref placeholders make sense for rev-list/log.

Sharing the parser would serve several purposes:

- reduced code
- increased test coverage (for-each-ref tests would test the parser)
- speed up for for-each-ref (due to your nice separation)
- short placeholders for for-each-ref
- automatic consistency between the two

Michael
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