Re: [msysGit] Re: [RFH] GSoC 2015 application

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Hi Matthieu,

On 2015-02-25 00:56, Matthieu Moy wrote:
> Johannes Schindelin <johannes.schindelin@xxxxxx> writes:
> 
>> On 2015-02-24 19:25, Junio C Hamano wrote:
>>> On Tue, Feb 24, 2015 at 9:32 AM, Matthieu Moy
>>> <Matthieu.Moy@xxxxxxxxxxxxxxx> wrote:
>>>> About the proposal:
>>>>
>>>>   The idea of this project is to dive into the Git source code and
>>>>   convert, say, git-add--interactive.perl and/or git stash into proper C
>>>>   code, making it a so-called "built-in".
>>>>
>>>> My advice would be to try converting several small scripts, and avoid
>>>> targetting a big one....
>>>> add--interactive and stash are relatively complex beasts, perhaps
>>>> git-pull.sh would be easier to start with.
>>>
>>> Yeah, I think that is a very good suggestion.
>>
>> Well, git-pull.sh is really small. I did not want to give the impression that the Git project is giving out freebies. But I have no objection to change it if you open that PR.
> 
> To get an idea, I counted the lines of code written by the student I
> mentored last year:
> 
> $ git log --author tanayabh@xxxxxxxxx -p | diffstat -s   
>  43 files changed, 1225 insertions(+), 367 deletions(-)
> 
> I would consider this GSoC as "average" (i.e. not exceptionnally good,
> but certainly not a bad one either), so you may hope for more, but you
> should not _expect_ much more IMHO.
> 
> In comparison:
> 
> $ wc -l git-add--interactive.perl
> 1654 git-add--interactive.perl
> $ wc -l git-stash.sh
> 617 git-stash.sh
> 
> I'd expect a rewrite in C to at least double the number of lines of
> code, so rewriting git-stash would mean writting at least as many lines
> of code as the GSoC above. git-add--interactive.perl would be rather far
> above.

Sure. You're right, I was thinking too big.

> But my point was not to convert _only_ git-pull.sh, but to have a GSoC
> starting with this one and plan more. Then, depending on how it goes,
> you can adjust the target.

That's excellent advice.

> This all depends on what you intend to do if the student does not finish
> the job. If you're going to do the rewrite yourself anyway, then having
> the student do even half of it is good already. If you're not going to
> finish the job by yourself, then a 95%-done-rewrite means a piece of
> code posted on the mailing list and never merged (and a lot of time
> wasted).

Well, all of this is academic at this point. Let's see whether we get accepted, and then, if a student finds this project compelling enough.

If both things happen, I will definitely heed your advice and encourage the student to start with some script that is easily converted, to "get her feet wet".

Ciao,
Dscho
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