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From: Stefan Beller <sbeller@google.com>
To: Jonathan Tan <jonathantanmy@google.com>
Cc: "git@vger.kernel.org" <git@vger.kernel.org>,
	Jeff King <peff@peff.net>, Junio C Hamano <gitster@pobox.com>,
	Michael Haggerty <mhagger@alum.mit.edu>,
	Jonathan Nieder <jrnieder@gmail.com>,
	Brandon Williams <bmwill@google.com>
Subject: Re: [PATCH 03/19] diff.c: drop 'nofirst' from emit_line_0
Date: Mon, 15 May 2017 11:33:03 -0700	[thread overview]
Message-ID: <CAGZ79kZSixaG2CoO-WV47=-eE96yhtoCm82KFbZ=-=8c-VPXcA@mail.gmail.com> (raw)
In-Reply-To: <115f4d30-5c97-9ee9-e56b-3cf955a5454e@google.com>

On Mon, May 15, 2017 at 11:26 AM, Jonathan Tan <jonathantanmy@google.com> wrote:

> "erroneous"?

yep, words are hard.

>
> I also don't understand the meaning of this paragraph - if you mean that
> this patch teaches other callers to hardcode the sign, I don't see any such
> changes in the diff below.

The last two hunks of the patch switch two callers that call with a sign
that is hard to reason about.

> After reading the patch below, would this commit message be better:
>
> [begin]
> diff.c: teach emit_line_0 to accept sign parameter
>
> Instead of a separate "first" parameter representing the first character of
> the line to be printed, make emit_line_0 take an optional "sign" parameter
> specifically intended to hold the sign of the line. Callers that store the
> sign and line separately can use the "sign" parameter like they used the
> "first" parameter previously, and callers that store the sign and line
> together (or do not have a sign) no longer need to manipulate their
> arguments to fit the requirements of emit_line_0.
>
> (And then mention that you have checked all the callers and that none of
> them send '\n' or '\r' as the sign, as you have done in this version.)
> [end]

That describes the situation better, indeed.

>> @@ -556,7 +547,7 @@ static void emit_line_0(struct diff_options *o, const
>> char *set, const char *res
>>  static void emit_line(struct diff_options *o, const char *set, const char
>> *reset,
>>                       const char *line, int len)
>>  {
>> -       emit_line_0(o, set, reset, line[0], line+1, len-1);
>> +       emit_line_0(o, set, reset, 0, line, len);
>>  }
>
>
> Maybe this function is unnecessary now that emit_line_0 can take the line
> directly.

That would produce a lot of code churn, specifically in later patches;
but I can remove that function if anyone feels strongly about it.

>> +                       char term[2];
>> +                       term[0] = options->line_termination;
>> +                       term[1] = '\0';
>> +
>> +                       emit_line(options, NULL, NULL,
>> +                                 term, 1);
>
>
> If options->line_termination is 0, this is actually a zero-length string
> (not 1).

So passing in !!options->line_termination should be fine?

Thanks,
Stefan

  reply	other threads:[~2017-05-15 18:33 UTC|newest]

Thread overview: 128+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-14  4:00 [RFC PATCH 00/19] Diff machine: highlight moved lines Stefan Beller
2017-05-14  4:00 ` [PATCH 01/19] diff: readability fix Stefan Beller
2017-05-14  4:01 ` [PATCH 02/19] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-15  6:48   ` Junio C Hamano
2017-05-15 16:13     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 03/19] diff.c: drop 'nofirst' from emit_line_0 Stefan Beller
2017-05-15 18:26   ` Jonathan Tan
2017-05-15 18:33     ` Stefan Beller [this message]
2017-05-16 16:05       ` Jonathan Tan
2017-05-15 19:22   ` Brandon Williams
2017-05-15 19:35     ` Stefan Beller
2017-05-15 19:45       ` Brandon Williams
2017-05-14  4:01 ` [PATCH 04/19] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-14  4:01 ` [PATCH 05/19] diff.c: emit_line_0 can handle no color setting Stefan Beller
2017-05-15 18:31   ` Jonathan Tan
2017-05-15 22:11     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 06/19] diff: add emit_line_fmt Stefan Beller
2017-05-15 19:31   ` Brandon Williams
2017-05-14  4:01 ` [PATCH 07/19] diff.c: convert fn_out_consume to use emit_line_* Stefan Beller
2017-05-16  1:00   ` Junio C Hamano
2017-05-16  1:05     ` Junio C Hamano
2017-05-16 16:23       ` Stefan Beller
2017-05-14  4:01 ` [PATCH 08/19] diff.c: convert builtin_diff " Stefan Beller
2017-05-15 18:42   ` Jonathan Tan
2017-05-14  4:01 ` [PATCH 09/19] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-14  4:01 ` [PATCH 10/19] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-15 19:09   ` Jonathan Tan
2017-05-15 19:31     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 11/19] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-14  4:01 ` [PATCH 12/19] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-14  4:01 ` [PATCH 13/19] diff.c: convert show_stats " Stefan Beller
2017-05-14  4:01 ` [PATCH 14/19] diff.c: convert word diffing " Stefan Beller
2017-05-15 22:40   ` Jonathan Tan
2017-05-15 23:12     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 15/19] diff.c: convert diff_flush " Stefan Beller
2017-05-15 20:21   ` Jonathan Tan
2017-05-15 22:08     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 16/19] diff.c: convert diff_summary " Stefan Beller
2017-05-14  4:01 ` [PATCH 17/19] diff.c: factor out emit_line_ws for coloring whitespaces Stefan Beller
2017-05-14  4:01 ` [PATCH 18/19] diff: buffer all output if asked to Stefan Beller
2017-05-14  4:06   ` Jeff King
2017-05-14  4:25     ` Stefan Beller
2017-05-16  4:14   ` Jonathan Tan
2017-05-16 16:42     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 19/19] diff.c: color moved lines differently Stefan Beller
2017-05-15 22:42   ` Brandon Williams
2017-05-16  4:34   ` Jonathan Tan
2017-05-16 12:31   ` Jeff King
2017-05-15 12:43 ` [RFC PATCH 00/19] Diff machine: highlight moved lines Junio C Hamano
2017-05-15 16:33   ` Stefan Beller
2017-05-17  2:58 ` [PATCHv2 00/20] " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 01/20] diff: readability fix Stefan Beller
2017-05-17  2:58   ` [PATCHv2 02/20] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-17  2:58   ` [PATCHv2 03/20] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-17  2:58   ` [PATCHv2 04/20] diff.c: teach emit_line_0 to accept sign parameter Stefan Beller
2017-05-17  2:58   ` [PATCHv2 05/20] diff.c: emit_line_0 can handle no color setting Stefan Beller
2017-05-17  2:58   ` [PATCHv2 06/20] diff.c: emit_line_0 takes parameter whether to output line prefix Stefan Beller
2017-05-17  2:58   ` [PATCHv2 07/20] diff.c: inline emit_line_0 into emit_line Stefan Beller
2017-05-17  2:58   ` [PATCHv2 08/20] diff.c: convert fn_out_consume to use emit_line Stefan Beller
2017-05-17  2:58   ` [PATCHv2 09/20] diff.c: convert builtin_diff to use emit_line_* Stefan Beller
2017-05-17  2:58   ` [PATCHv2 10/20] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 11/20] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-17  5:03     ` Junio C Hamano
2017-05-17 21:16       ` Stefan Beller
2017-05-18  3:35     ` Junio C Hamano
2017-05-17  2:58   ` [PATCHv2 12/20] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-17  5:19     ` Junio C Hamano
2017-05-17 21:05       ` Stefan Beller
2017-05-18  3:25         ` Junio C Hamano
2017-05-18 17:12           ` Stefan Beller
2017-05-20  4:50             ` Junio C Hamano
2017-05-20 22:00               ` Stefan Beller
2017-05-17  2:58   ` [PATCHv2 13/20] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-17  2:58   ` [PATCHv2 14/20] diff.c: convert show_stats " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 15/20] diff.c: convert word diffing " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 16/20] diff.c: convert diff_flush " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 17/20] diff.c: convert diff_summary " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 18/20] diff.c: emit_line includes whitespace highlighting Stefan Beller
2017-05-17  2:58   ` [PATCHv2 19/20] diff: buffer all output if asked to Stefan Beller
2017-05-17  2:58   ` [PATCHv2 20/20] diff.c: color moved lines differently Stefan Beller
2017-05-18 19:37   ` [PATCHv3 00/20] Diff machine: highlight moved lines Stefan Beller
2017-05-18 19:37     ` [PATCHv3 01/20] diff: readability fix Stefan Beller
2017-05-18 19:37     ` [PATCHv3 02/20] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-18 19:37     ` [PATCHv3 03/20] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-18 19:37     ` [PATCHv3 04/20] diff.c: teach emit_line_0 to accept sign parameter Stefan Beller
2017-05-18 23:33       ` Jonathan Tan
2017-05-22 23:36         ` Stefan Beller
2017-05-18 19:37     ` [PATCHv3 05/20] diff.c: emit_line_0 can handle no color setting Stefan Beller
2017-05-18 19:37     ` [PATCHv3 06/20] diff.c: emit_line_0 takes parameter whether to output line prefix Stefan Beller
2017-05-18 19:37     ` [PATCHv3 07/20] diff.c: inline emit_line_0 into emit_line Stefan Beller
2017-05-18 19:37     ` [PATCHv3 08/20] diff.c: convert fn_out_consume to use emit_line Stefan Beller
2017-05-18 19:37     ` [PATCHv3 09/20] diff.c: convert builtin_diff to use emit_line_* Stefan Beller
2017-05-18 19:37     ` [PATCHv3 10/20] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 11/20] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 12/20] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-18 19:37     ` [PATCHv3 13/20] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-18 19:37     ` [PATCHv3 14/20] diff.c: convert show_stats " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 15/20] diff.c: convert word diffing " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 16/20] diff.c: convert diff_flush " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 17/20] diff.c: convert diff_summary " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 18/20] diff.c: emit_line includes whitespace highlighting Stefan Beller
2017-05-18 19:37     ` [PATCHv3 19/20] diff: buffer all output if asked to Stefan Beller
2017-05-18 19:37     ` [PATCHv3 20/20] diff.c: color moved lines differently Stefan Beller
2017-05-19 18:23       ` Jonathan Tan
2017-05-19 18:40         ` Stefan Beller
2017-05-19 19:34           ` Jonathan Tan
2017-05-23  2:40     ` [PATCHv4 00/17] Diff machine: highlight moved lines Stefan Beller
2017-05-23  2:40       ` [PATCHv4 01/17] diff: readability fix Stefan Beller
2017-05-23  2:40       ` [PATCHv4 02/17] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-23  2:40       ` [PATCHv4 03/17] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-23  2:40       ` [PATCHv4 04/17] diff: introduce more flexible emit function Stefan Beller
2017-05-23  2:40       ` [PATCHv4 05/17] diff.c: convert fn_out_consume to use emit_line Stefan Beller
2017-05-23  2:40       ` [PATCHv4 06/17] diff.c: convert builtin_diff to use emit_line_* Stefan Beller
2017-05-23  2:40       ` [PATCHv4 07/17] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 08/17] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 09/17] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-23  5:59         ` Junio C Hamano
2017-05-23 18:14           ` Stefan Beller
2017-05-23  2:40       ` [PATCHv4 10/17] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-23  2:40       ` [PATCHv4 11/17] diff.c: convert show_stats " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 12/17] diff.c: convert word diffing " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 13/17] diff.c: convert diff_flush " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 14/17] diff.c: convert diff_summary " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 15/17] diff.c: emit_line includes whitespace highlighting Stefan Beller
2017-05-23  2:40       ` [PATCHv4 16/17] diff: buffer all output if asked to Stefan Beller
2017-05-23  2:40       ` [PATCHv4 17/17] diff.c: color moved lines differently Stefan Beller
2017-05-27  1:04       ` [PATCHv4 00/17] Diff machine: highlight moved lines Jacob Keller
2017-05-30 21:38         ` Stefan Beller

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