Hi Yann,

On Mon, Dec 17, 2012 at 11:40 AM, Yann Dirson <dir...@bertin.fr> wrote:
> On Mon, 17 Dec 2012 09:43:53 +0100
> Thomas Rast <tr...@student.ethz.ch> wrote:
>> Junio C Hamano <gits...@pobox.com> writes:
>> I suppose there's the additional issue that grafts are much easier to
>> use than replacements if you really only want to replace some parent
>> lists.  With replace you need to handcraft the replacement commits, and
>> git-replace(1) unhelpfully does not say this, much less gives an example
>> how to do it.
> Right, replace refs can surely be made easier to use.  The requirement to 
> craft a
> new commit manually is a major step back in ease of use.

Yeah, at one point I wanted to have a command that created to craft a
new commit based on an existing one.
Perhaps it could be useful when using filter-branch or perhaps it
could reuse some filter-branch code.

> Maybe something like "git replace -p <orig-commit> <parent>..." to just 
> provide a simple
> API to the exact graft functionnality would be good.  But it would be 
> commit-specific, whereas
> replace refs are indeed more generic, and, one could want to rewrite any 
> other part of the commit,
> so we could prefer a more general mechanism.

Yeah I wondered at one point if something like the following would do:

git replace --parent <parent1> --parent <parent2> --author <author>
--commiter <commiter> ... <orig-commit>

> Something that could be useful in this respect, would be an --amend like 
> option to git-commit, like
> "git commit --replace".  But unfortunately it does not allow to change 
> parents, and it has the
> drawback of requiring that HEAD points to the commit to be replaced.
> So maybe, if there are no other idea, a simple "git graft" command that would 
> wrap "git replace",
> would fill the gap.

It would not be straightforward to call it "graft" if it uses git replace.

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