Re: RFC: git status --amend

[Jeff King <peff@peff.net>]

On Fri, Apr 03, 2015 at 02:57:48PM -0700, David Aguilar wrote:

> > But I discarded it as a useless suggestion before writing it down,
> > primarily because I couldn't come up with an explanation _why_ being
> > able to say "git status --relative-to=next Makefile" is useful when
> > on the 'master' branch.
> 
> Aesthetically it's appealing because it mirrors commands like
> "git diff HEAD^", etc.
> 
> I can see it being useful for script writers but it's a minority
> case that's already handled by having "status --amend" for the
> common case of needing to mimic "commit --amend".
> 
> Beyond that use case, someone could use it to write a butchery
> tool that gets a quick high-level diff of changes for both index
> and worktree against an arbitrary ref, and then apply those
> changes selectively using other git tools.

Hmm. What if you had a tool that created commits out of an alternate
working tree and index, and then committed directly to a branch without
touching HEAD? Then you might run:

  GIT_WORK_TREE=... GIT_INDEX_FILE=... git status --relative-to=mybranch

right before running:

  old=$(git rev-parse refs/heads/mybranch) &&
  tree=$(GIT_INDEX_FILE=... git commit-tree) &&
  commit=$(echo whatever | git commit-tree -p $old $tree) &&
  git update-ref refs/heads/mybranch $old

or similar. That is basically "git-new-workdir", but with no per-workdir
HEAD. Which is probably crazy, but maybe useful for a one-off commit to
another branch or something.

I dunno. I do not have such a tool or plan to work on one, but it is at
least plausible to me.

-Peff