Re: [PATCH/RFC][GSoC] make "git diff --no-index $directory $file" DWIM better.

[t.gummerer@gmail.com]

Hi,

On 03/15, Yurii Shevtsov wrote:
> Changes 'git diff --no-index $directory $file' behaviour.
> Now it is transformed to 'git diff --no-index $directory/&file $file'
> instead of throwing an error.

The commit message should describe why the change is made, see
Documentation/SubmittingPatches, section (2)

> Signed-off-by: Yurii Shevtsov <ungetch <at> gmail.com>

Please use your full email here, without replacing @ with <at>

> ---
>  diff-no-index.c |   21 +++++++++++++++++++--

You should probably add a test for the new behaviour in
t/t4053-diff-no-index.sh.

>  1 files changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/diff-no-index.c b/diff-no-index.c
> index 265709b..4e71b36 100644
> --- a/diff-no-index.c
> +++ b/diff-no-index.c
> @@ -97,8 +97,25 @@ static int queue_diff(struct diff_options *o,
>         if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
>                 return -1;
> 
> -       if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
> -               return error("file/directory conflict: %s, %s", name1, name2);
> +       if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) {
> +               struct strbuf dirnfile;
> +               const char *dir, *file;
> +               char *filename;
> +               int ret = 0;
> +
> +               dir = S_ISDIR(mode1) ? name1 : name2;
> +               file = (dir == name1) ? name2 : name1;

This makes git diff --no-index $directory $file the same as
git diff --no-index $file $directory.  Shouldn't these commands give
different results?  (See the behaviour of diff in this case, and
compare it to the behaviour you introduced here)

> +               strbuf_init(&dirnfile, strlen(name1) + strlen(name2) + 2);
> +               strbuf_addstr(&dirnfile, dir);
> +               if (dirnfile.buf[dirnfile.len - 1] != '/')
> +                       strbuf_addch(&dirnfile, '/');
> +               filename = strrchr(file, '/');
> +               strbuf_addstr(&dirnfile, filename ? (filename + 1) : file);
> +               ret = queue_diff(o, dirnfile.buf, file);
> +               strbuf_release(&dirnfile);
> +
> +               return ret;
> +       }

Your MUA seems to have replaced tabs with spaces in this email.  The
easiest way to get the formatting correct is the git send-email tool.
You should also try to sending the mail to yourself first and see if
it applies correctly with git am.

> 
>         if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
>                 struct strbuf buffer1 = STRBUF_INIT;
> --
> 
> I hope I understood task correct. I think this patch requires writing
> additional tests, so that's what I'm going to do now.
> --
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