From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 21 Nov 2016 19:07:40 GMT
Subject: Re: [PATCH 3/3] rebase -i: handle core.commentChar=auto
Message-ID: <xmqqy40circz.fsf@gitster.mtv.corp.google.com>
In-Reply-To: <8b783f3d-8fda-b5cb-239f-895b10a22a73@kdbg.org>

Johannes Sixt <j6t@kdbg.org> writes:

> Am 21.11.2016 um 19:40 schrieb Junio C Hamano:
>> Johannes Sixt <j6t@kdbg.org> writes:
>>> It could be written without forking a process:
>>>
>>> 	comment_char=${comment_char%${comment_char#?}}
>>>
>>> (aka "remove from the end what remains after removing the first character")
>>
>> Hopefully nobody would include any glob metacharacters in there,
>> e.g. "core.commentchar='=*'", which would break that?
>
> Heh. I tested a few variations, but not this one. Make it
>
>  	comment_char=${comment_char%"${comment_char#?}"}

I tried a few implementations of shells, and decided that this is
not worth the portability hassle.

Setting comment-char to multi-letter sequence is not supported at
all, and this code is protecting itself from that nonsense---it does
not need to be fast, and Dscho already gives a fast path for a
single letter case in his patch.