Re: Please support add -p with a new file, to add only part of the file

[Josh Triplett <josh@joshtriplett.org>]

On Tue, Jan 10, 2012 at 02:38:57PM -0500, Jeff King wrote:
> On Tue, Jan 10, 2012 at 11:33:39AM -0800, Junio C Hamano wrote:
> 
> > Jeff King <peff@peff.net> writes:
> > 
> > >> Even if you start with "add -N", there won't be individual "hunks" you can
> > >> pick and choose from diffing emptiness and the whole new file, so you end
> > >> up using "edit hunk" interface.
> > >
> > > I don't think the main impetus for this is that people necessarily want
> > > to pick and choose hunks from added files.
> > 
> > Well, read the subject of your e-mail and tell me what it says ;-)
> 
> Heh. Oops.
> 
> Yes, I agree that "add -p" is not especially useful for that case, and
> the workflow I was describing is very different[1].

I've gotten used to editing diffs directly, and when I just want to
include subsets of a file on a chunk-by-chunk basis (for instance, one
new function but not another new function), I'd find it a lot easier and
less error-prone to "git add -p newfile" and edit a diff than to copy
the file aside, edit the original to delete pieces I don't want, add,
commit, and copy the file back.

Most importantly, I want to use "git add -p" because I know it'll
*never* modify my working copy, only the index.  I find that a useful
safety property.

Apart from that, it also means I have less mental state to track
("remember to copy the original file back later").

- Josh Triplett