From: Anselm Schüler <mail@anselmschueler.com>
Date: Mon, 24 Feb 2025 14:11:26 GMT
Subject: Re: Possible bug: Empty magic word list in pathspec is handled differently in short vs. long form
Message-ID: <5f312413-0b7d-4bcb-b180-57857afa3898@anselmschueler.com>
In-Reply-To: <xmqqr03tg8q1.fsf@gitster.g>

Thank you and Lucas Oshiro <lucasseikioshiro@gmail.com> for the 
clarification

On 19/02/2025 18:11, Junio C Hamano wrote:
> Anselm Schüler <mail@anselmschueler.com> writes:
>
>> If you run git diff for a pathspec with an empty magic word/symbol
>> list in short form (prefixed by ::) and in long form (prefixed by
>> :():), you get different results.
> The short form is prefixed by a ":" and optionally ends by a ":",
> but the optional termination may not be required when there is no
> ambiguity (e.g. ":/!path" is "from the top, not matching "path", as
> "p" cannot be a magic signature; ":/:!path" is "from the top,
> matching "!path", as the set of magic signatures ends with the
> second disambiguating colon).
>
> The long form is prefixed by a ":(" and ends by a ")".
>
>
>> Here’s an example use of git that illustrates this:
>>
>> ~☭ mkdir gittest
>> ~☭ y gittest/
>> ~/gittest☭ git init
>> Initialized empty Git repository in /home/anselmschueler/gittest/.git/
>> ~/gittest (b0)☭ uuidgen >file
>> ~/gittest (b0)☭ git add file && git commit -m "$(read)"
>> read> initial commit
>> [b0 (root-commit) cd3bd43] initial commit
>>   1 file changed, 1 insertion(+)
>>   create mode 100644 file
>> ~/gittest (b0)☭ uuidgen >file
>> ~/gittest (b0)☭ git diff -- "::file"
>>
>> file
>> ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>>
>> ───┐
>> 1: │
>> ───┘
>> 66d18ffa-1128-42a5-8d4e-f9d75eb86b92
>> 9acea2b5-50a6-4f87-ae1a-64019a93e55e
>> ~/gittest (b0)☭ git diff -- ":():file"
>> ~/gittest (b0)☭
> Doesn't ":():file" ask for a match for the pattern ":file", with a
> leading colon?