From: Junio C Hamano <gitster@pobox.com>
To: "Linus Arver via GitGitGadget" <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Glen Choo <glencbz@gmail.com>,
Christian Couder <chriscool@tuxfamily.org>,
Phillip Wood <phillip.wood123@gmail.com>,
Jonathan Tan <jonathantanmy@google.com>,
Linus Arver <linusa@google.com>
Subject: Re: [PATCH v5 2/3] trailer: find the end of the log message
Date: Fri, 20 Oct 2023 14:29:08 -0700 [thread overview]
Message-ID: <xmqqr0lpoue3.fsf@gitster.g> (raw)
In-Reply-To: <ce25420db29c9953095db652584dbed4e35d67ad.1697828495.git.gitgitgadget@gmail.com> (Linus Arver via GitGitGadget's message of "Fri, 20 Oct 2023 19:01:34 +0000")
"Linus Arver via GitGitGadget" <gitgitgadget@gmail.com> writes:
> From: Linus Arver <linusa@google.com>
>
> Previously, trailer_info_get() computed the trailer block end position
> by
>
> (1) checking for the opts->no_divider flag and optionally calling
> find_patch_start() to find the "patch start" location (patch_start), and
> (2) calling find_trailer_end() to find the end of the trailer block
> using patch_start as a guide, saving the return value into
> "trailer_end".
>
> The logic in (1) was awkward because the variable "patch_start" is
> misleading if there is no patch in the input. The logic in (2) was
> misleading because it could be the case that no trailers are in the
> input (yet we are setting a "trailer_end" variable before even searching
> for trailers, which happens later in find_trailer_start()). The name
> "find_trailer_end" was misleading because that function did not look for
> any trailer block itself --- instead it just computed the end position
> of the log message in the input where the end of the trailer block (if
> it exists) would be (because trailer blocks must always come after the
> end of the log message).
>
> Combine the logic in (1) and (2) together into find_patch_start() by
> renaming it to find_end_of_log_message(). The end of the log message is
> the starting point which find_trailer_start() needs to start searching
> backward to parse individual trailers (if any).
>
> Helped-by: Jonathan Tan <jonathantanmy@google.com>
> Helped-by: Junio C Hamano <gitster@pobox.com>
> Signed-off-by: Linus Arver <linusa@google.com>
> ---
> trailer.c | 64 +++++++++++++++++++++++++++++++++++--------------------
> 1 file changed, 41 insertions(+), 23 deletions(-)
>
> diff --git a/trailer.c b/trailer.c
> index 3c54b38a85a..70c81fda710 100644
> --- a/trailer.c
> +++ b/trailer.c
> @@ -809,21 +809,50 @@ static ssize_t last_line(const char *buf, size_t len)
> }
>
> /*
> - * Return the position of the start of the patch or the length of str if there
> - * is no patch in the message.
> + * Find the end of the log message as an offset from the start of the input
> + * (where callers of this function are interested in looking for a trailers
> + * block in the same input). We have to consider two categories of content that
> + * can come at the end of the input which we want to ignore (because they don't
> + * belong in the log message):
> + *
> + * (1) the "patch part" which begins with a "---" divider and has patch
> + * information (like the output of git-format-patch), and
> + *
> + * (2) any trailing comment lines, blank lines like in the output of "git
> + * commit -v", or stuff below the "cut" (scissor) line.
> + *
> + * As a formula, the situation looks like this:
> + *
> + * INPUT = LOG MESSAGE + IGNORED
> + *
> + * where IGNORED can be either of the two categories described above. It may be
> + * that there is nothing to ignore. Now it may be the case that the LOG MESSAGE
> + * contains a trailer block, but that's not the concern of this function.
> */
> -static size_t find_patch_start(const char *str)
> +static size_t find_end_of_log_message(const char *input, int no_divider)
> {
> + size_t end;
> const char *s;
>
> - for (s = str; *s; s = next_line(s)) {
> + /* Assume the naive end of the input is already what we want. */
> + end = strlen(input);
> +
> + if (no_divider) {
> + return end;
> + }
OK. The early return may make sense, as we are essentially
declaring that everything is the "INPUT (= message + ignored)".
You do not need {braces} around a single-statement block, though.
Other than that, I didn't find anything quesionable in any of the
patches in this round. Looking good.
Thanks.
next prev parent reply other threads:[~2023-10-20 21:29 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-05 5:04 [PATCH 0/5] Trailer readability cleanups Linus Arver via GitGitGadget
2023-08-05 5:04 ` [PATCH 1/5] trailer: separate public from internal portion of trailer_iterator Linus Arver via GitGitGadget
2023-08-07 21:16 ` Glen Choo
2023-08-08 12:19 ` Phillip Wood
2023-08-10 23:15 ` Linus Arver
2023-08-10 22:50 ` Linus Arver
2023-08-05 5:04 ` [PATCH 2/5] trailer: split process_input_file into separate pieces Linus Arver via GitGitGadget
2023-08-07 22:39 ` Glen Choo
2023-08-11 0:41 ` Linus Arver
2023-08-05 5:04 ` [PATCH 3/5] trailer: split process_command_line_args into separate functions Linus Arver via GitGitGadget
2023-08-07 22:51 ` Glen Choo
2023-08-11 0:59 ` Linus Arver
2023-08-11 1:02 ` Linus Arver
2023-08-11 21:11 ` Glen Choo
2023-08-05 5:04 ` [PATCH 4/5] trailer: teach find_patch_start about --no-divider Linus Arver via GitGitGadget
2023-08-07 23:28 ` Glen Choo
2023-08-11 1:25 ` Linus Arver
2023-08-11 20:51 ` Glen Choo
2023-08-05 5:04 ` [PATCH 5/5] trailer: rename *_DEFAULT enums to *_UNSPECIFIED Linus Arver via GitGitGadget
2023-08-07 23:45 ` Glen Choo
2023-08-11 18:00 ` Linus Arver
2023-09-09 6:16 ` [PATCH v2 0/6] Trailer readability cleanups Linus Arver via GitGitGadget
2023-09-09 6:16 ` [PATCH v2 1/6] trailer: separate public from internal portion of trailer_iterator Linus Arver via GitGitGadget
2023-09-11 17:10 ` Junio C Hamano
2023-09-09 6:16 ` [PATCH v2 2/6] trailer: split process_input_file into separate pieces Linus Arver via GitGitGadget
2023-09-11 17:10 ` Junio C Hamano
2023-09-09 6:16 ` [PATCH v2 3/6] trailer: split process_command_line_args into separate functions Linus Arver via GitGitGadget
2023-09-09 6:16 ` [PATCH v2 4/6] trailer: teach find_patch_start about --no-divider Linus Arver via GitGitGadget
2023-09-11 17:25 ` Junio C Hamano
2023-09-14 2:19 ` Linus Arver
2023-09-14 3:12 ` Junio C Hamano
2023-09-14 5:31 ` Linus Arver
2023-09-09 6:16 ` [PATCH v2 5/6] trailer: rename *_DEFAULT enums to *_UNSPECIFIED Linus Arver via GitGitGadget
2023-09-11 18:54 ` Junio C Hamano
2023-09-14 2:41 ` Linus Arver
2023-09-14 3:16 ` Junio C Hamano
2023-09-22 18:23 ` Linus Arver
2023-09-22 19:48 ` Junio C Hamano
2023-09-26 5:30 ` Linus Arver
2023-09-09 6:16 ` [PATCH v2 6/6] trailer: use offsets for trailer_start/trailer_end Linus Arver via GitGitGadget
2023-09-11 19:01 ` Junio C Hamano
2023-09-14 1:21 ` Linus Arver
2023-09-14 3:18 ` Linus Arver
2023-09-22 19:50 ` [PATCH v3 0/9] Trailer readability cleanups Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 1/9] trailer: separate public from internal portion of trailer_iterator Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 2/9] trailer: split process_input_file into separate pieces Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 3/9] trailer: split process_command_line_args into separate functions Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 4/9] trailer: rename *_DEFAULT enums to *_UNSPECIFIED Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 5/9] commit: ignore_non_trailer computes number of bytes to ignore Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 6/9] trailer: find the end of the log message Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 7/9] trailer: use offsets for trailer_start/trailer_end Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 8/9] trailer: only use trailer_block_* variables if trailers were found Linus Arver via GitGitGadget
2023-09-22 19:50 ` [PATCH v3 9/9] trailer: make stack variable names match field names Linus Arver via GitGitGadget
2023-09-22 22:47 ` [PATCH v3 0/9] Trailer readability cleanups Junio C Hamano
2023-09-22 23:13 ` Linus Arver
2023-09-23 0:48 ` Junio C Hamano
2023-09-26 5:40 ` Linus Arver
2023-09-26 6:22 ` [PATCH v4 0/4] " Linus Arver via GitGitGadget
2023-09-26 6:22 ` [PATCH v4 1/4] commit: ignore_non_trailer computes number of bytes to ignore Linus Arver via GitGitGadget
2023-09-26 6:22 ` [PATCH v4 2/4] trailer: find the end of the log message Linus Arver via GitGitGadget
2023-09-28 23:16 ` Jonathan Tan
2023-10-20 0:24 ` Linus Arver
2023-10-20 0:36 ` Junio C Hamano
2023-09-26 6:22 ` [PATCH v4 3/4] trailer: use offsets for trailer_start/trailer_end Linus Arver via GitGitGadget
2023-09-26 6:22 ` [PATCH v4 4/4] trailer: only use trailer_block_* variables if trailers were found Linus Arver via GitGitGadget
2023-10-20 19:01 ` [PATCH v5 0/3] Trailer readability cleanups Linus Arver via GitGitGadget
2023-10-20 19:01 ` [PATCH v5 1/3] commit: ignore_non_trailer computes number of bytes to ignore Linus Arver via GitGitGadget
2023-10-20 19:01 ` [PATCH v5 2/3] trailer: find the end of the log message Linus Arver via GitGitGadget
2023-10-20 21:29 ` Junio C Hamano [this message]
2023-12-29 6:42 ` Linus Arver
2023-12-29 21:03 ` Linus Arver
2023-10-20 19:01 ` [PATCH v5 3/3] trailer: use offsets for trailer_start/trailer_end Linus Arver via GitGitGadget
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