Please bottom post - see below.
Javier Domingo Cansino venit, vidit, dixit 12.03.2016 03:48:
> dash is usually used for representing stdin / stdout as a file. I
> think this could drive to error... but I would agree with transforming
> -h1 to @{-1} or -h2 to @{-2} (-h representing head).
>
> I do agree however that all those signs are thought with american
> keyboards in mind. All those punctuation marks are usually hard to
> type in other keyboards, and -h1 is way simpler than HEAD~ or @{-1}
>
> This links provides an example of my worry:
> http://stackoverflow.com/questions/15270970/is-it-possible-to-git-diff-a-file-against-standard-input
>
> On Sat, Mar 12, 2016 at 2:11 AM, Senorsen <senorsen.zhang@xxxxxxxxx> wrote:
>>
>> Currently it just replace "-" in argv[] into "@{-1}".
>>
>> For example,
>>
>> git diff -
>>
>> equals to
>>
>> git diff @{-1}
>>
>> Signed-off-by: Senorsen <senorsen.zhang@xxxxxxxxx>
>> ---
>> Notes:
>> Hello everyone, I'm Zhang Sen, a college student from Zhejiang University
>> in China, and this is a patch for the microproject of GSoC 2016. I'm
>> looking forward to contributing to Git and participating in GSoC 2016.
>>
>> I have learnt some rules and guides from the documents, and carefully
>> wrote this small patch, according to other code from git.
>>
>> Thanks a lot!
>>
>> builtin/diff.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/builtin/diff.c b/builtin/diff.c
>> index 52c98a9..c110141 100644
>> --- a/builtin/diff.c
>> +++ b/builtin/diff.c
>> @@ -389,6 +389,11 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
>> }
>> }
>>
>> + for (i = 0; i < argc; i++) {
>> + if (!strcmp(argv[i], "-"))
>> + argv[i] = "@{-1}";
>> + }
>> +
>> for (i = 0; i < rev.pending.nr; i++) {
>> struct object_array_entry *entry = &rev.pending.objects[i];
>> struct object *obj = entry->item;
>> --
>> 2.7.0
>>
Please bottom post on this list. Thanks.
In git land, "checkout", "merge" and "revert" know "-" as an
abbreviation for "@{-1}" already. No git command knows "-" as an
abbreviation for "stdin".
The analogy here is "cd -": switch to the previous directory.
So, a user can expect git to switch to the previously checked out branch
with "git checkout -".
The use of "-" in "merge" and "revert" stress that analogy quite a bit
already, and "diff" goes even further - I'm not a big fan of this. I
feel we should think about the meaning of "-":
"-" = "@{-1}": Then why not implement it at the revision machinery level
(rather than per command)? Otherwise, we raise expectations that we
don't meet.
OR:
"-" = "previous <thing>", with <thing> depending on the command context:
Then <thing> may be the content of HEAD or a commit or what not, and,
correspondingly, "-" should resolve to "@{-1}" (i.e. "HEAD@{1}") or
"HEAD^" or what not.
"git diff" is already a chameleon, diffing files, commits, blobs, index,
automatically choosing the second side in the diff if you specify only
one (or give options), and the questions which "-" blends in naturally
may very well depend on the actual color of the chameleon :)
Michael
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