Re: [PATCH 1/4] notes: print note blob to stdout directly

[Junio C Hamano <gitster@pobox.com>]

Maarten Bosmans <mkbosmans@gmail.com> writes:

>> I am not sure if we want to accept an approach that feels somewhat
>> narrow/short sighted, like this patch.  When "git show" learns an
>> improved way to show blob objects, who will update the code this
>> patch touches to teach it to use the same improved way to show the
>> notes?

Another thing I forgot to mention was that I suspected the use of
"git show" was so that we can deal with notes trees whose leaves are
*not* blob objects.  As our "git notes" machinery, including how the
initial contents are populated with "git notes add" and how existing
notes on the same object are merged, all assume and depend on that
the leaves are blobs, we can say "we'll just dump to stdout with
write_in_full()", but who knows what kind of custom crap random
third-party tools and IDEs try to use notes trees to store.

Even if we limit ourselves to blobs, they may not be suitable to be
dumped to tty (or a pager, for that matter), and I can see how
textconv could be used as a way out ("detect that the notes payload
is an image and spawn display" kind of hack in a repository full of
images and notes used to store thumbnails, perhaps).

> That is also a cool idea. That would probably use the functionality of
> the cat-file batch mode, right?

Not really.  I was hoping that "git show" that can take multiple
objects from its command line would directly be used, or with a new
option that gives a separator between these objects.

Perhaps we want a new option, e.g., "git notes show --text" that
passes the contents of the leaf blob object to write_in_full(),
bypassing all the things "git show" does, while in a rare case when
the leaf we find is not a blob to invoke "git show".  That might be
a safe approach to move forward, if we wanted to do this.