Re: [PATCH] fetch: prefer suffix substitution in compact fetch.output

[Junio C Hamano <gitster@xxxxxxxxx>]

Nguyễn Thái Ngọc Duy  <pclouds@xxxxxxxxx> writes:

> I have a remote named "jch" and it has a branch with the same name. And
> fetch.output is set to "compact". Fetching this remote looks like this
>
>  From https://github.com/gitster/git
>   + eb7fd39f6b...835363af2f jch                -> */jch  (forced update)
>     6f11fd5edb..59b12ae96a  nd/config-move-to  -> jch/*
>   * [new branch]            nd/diff-parseopt   -> jch/*
>   * [new branch]            nd/the-index-final -> jch/*
>
> Notice that the local side of branch jch starts with "*" instead of
> ending with it like the rest. It's not exactly wrong. It just looks
> weird.
>
> This patch changes the find-and-replace code a bit to try finding prefix
> first before falling back to strstr() which finds a substring from left
> to right. Now we have something less OCD
>
>  From https://github.com/gitster/git
>   + eb7fd39f6b...835363af2f jch                -> jch/*  (forced update)
>     6f11fd5edb..59b12ae96a  nd/config-move-to  -> jch/*
>   * [new branch]            nd/diff-parseopt   -> jch/*
>   * [new branch]            nd/the-index-final -> jch/*

Sounds good.  I do not think strstr() would ever be correct in this
application in the first place.  In what situation would it produce
a reasonable result, I wonder?

> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
> ---
>  builtin/fetch.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/builtin/fetch.c b/builtin/fetch.c
> index e0140327aa..e0173f8a33 100644
> --- a/builtin/fetch.c
> +++ b/builtin/fetch.c
> @@ -629,9 +629,14 @@ static int find_and_replace(struct strbuf *haystack,
>  			    const char *needle,
>  			    const char *placeholder)
>  {
> -	const char *p = strstr(haystack->buf, needle);
> +	const char *p = NULL;
>  	int plen, nlen;
>  
> +	nlen = strlen(needle);
> +	if (ends_with(haystack->buf, needle))
> +		p = haystack->buf + haystack->len - nlen;
> +	else
> +		p = strstr(haystack->buf, needle);
>  	if (!p)
>  		return 0;
>  
> @@ -639,7 +644,6 @@ static int find_and_replace(struct strbuf *haystack,
>  		return 0;
>  
>  	plen = strlen(p);
> -	nlen = strlen(needle);
>  	if (plen > nlen && p[nlen] != '/')
>  		return 0;