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From: Eric Sunshine <sunshine@sunshineco.com>
To: Olga Telezhnaya <olyatelezhnaya@gmail.com>
Cc: Git List <git@vger.kernel.org>
Subject: Re: [PATCH v4 2/5] ref-filter: add return value && strbuf to handlers
Date: Tue, 20 Mar 2018 14:18:42 -0400
Message-ID: <CAPig+cT5jh0y9Rmw0E6ns0k5mSwaxAqdaN8oWCayCE8V+jYZow@mail.gmail.com> (raw)
In-Reply-To: <010201624428190c-441272b2-bc7d-42af-82f8-6a805bb27f6c-000000@eu-west-1.amazonses.com>

On Tue, Mar 20, 2018 at 12:05 PM, Olga Telezhnaya
<olyatelezhnaya@gmail.com> wrote:
> Continue removing die() calls from ref-filter formatting logic,
> so that it could be used by other commands.
> [...]
> Signed-off-by: Olga Telezhnaia <olyatelezhnaya@gmail.com>
> ---
> diff --git a/ref-filter.c b/ref-filter.c
> @@ -596,19 +603,24 @@ static int is_empty(const char *s)
> +static int then_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state,
> +                            struct strbuf *err)
>  {
>         struct ref_formatting_stack *cur = state->stack;
>         struct if_then_else *if_then_else = NULL;
>
>         if (cur->at_end == if_then_else_handler)
>                 if_then_else = (struct if_then_else *)cur->at_end_data;
> -       if (!if_then_else)
> -               die(_("format: %%(then) atom used without an %%(if) atom"));
> -       if (if_then_else->then_atom_seen)
> -               die(_("format: %%(then) atom used more than once"));
> -       if (if_then_else->else_atom_seen)
> -               die(_("format: %%(then) atom used after %%(else)"));
> +       if (!if_then_else) {
> +               strbuf_addstr(err, _("format: %(then) atom used without an %(if) atom"));
> +               return -1;
> +       } else if (if_then_else->then_atom_seen) {
> +               strbuf_addstr(err, _("format: %(then) atom used more than once"));
> +               return -1;
> +       } else if (if_then_else->else_atom_seen) {
> +               strbuf_addstr(err, _("format: %(then) atom used after %(else)"));
> +               return -1;
> +       }

This pattern of transforming:

    if (cond)
        die("...");

to:

    if (cond) {
        strbuf_add*(...);
        return -1;
    }

is repeated many, many times throughout this patch series and makes
for quite noisy diffs. Such repetition and noise suggests that this
patch series (and other similar ones) could benefit from a convenience
function similar to the existing error() function. For instance:

    int strbuf_error(struct strbuf *buf, const char *fmt, ...);

which appends the formatted message to 'buf' and unconditionally
returns -1. Thus, the above transformation simplifies to:

    if (cond)
        return strbuf_error(&err, "...", ...);

which makes for a much less noisy diff, thus is easier to review.

A new patch introducing such a function at the head of this patch
series might be welcome.

  reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-13 10:16 [RFC 1/4] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-13 10:16 ` [RFC 2/4] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-13 19:13   ` Martin Ågren
2018-03-13 10:16 ` [RFC 3/4] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-13 19:18   ` Martin Ågren
2018-03-14 13:36     ` Оля Тележная
2018-03-13 10:16 ` [RFC 4/4] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-13 19:12 ` [RFC 1/4] ref-filter: start adding strbufs with errors Martin Ågren
2018-03-14 13:30   ` Оля Тележная
2018-03-14 19:04 ` [PATCH v2 1/5] " Olga Telezhnaya
2018-03-14 19:04   ` [PATCH v2 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-14 19:04   ` [PATCH v2 5/5] ref-filter: get_ref_atom_value() error handling Olga Telezhnaya
2018-03-15 20:47     ` Martin Ågren
2018-03-15 21:01       ` Eric Sunshine
2018-03-16  7:20         ` Оля Тележная
2018-03-15 21:05       ` Junio C Hamano
2018-03-16  7:17       ` Оля Тележная
2018-03-14 19:04   ` [PATCH v2 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-14 19:04   ` [PATCH v2 3/5] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-15 22:48     ` Junio C Hamano
2018-03-16  7:22       ` Оля Тележная
2018-03-19 13:01   ` [PATCH v3 1/5] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-19 13:01     ` [PATCH v3 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-19 13:01     ` [PATCH v3 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-19 19:24       ` Junio C Hamano
2018-03-19 13:01     ` [PATCH v3 5/5] ref-filter: get_ref_atom_value() error handling Olga Telezhnaya
2018-03-19 13:01     ` [PATCH v3 3/5] ref-filter: change parsing function " Olga Telezhnaya
2018-03-19 19:41       ` Junio C Hamano
2018-03-20 16:05     ` [PATCH v4 1/5] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-20 16:05       ` [PATCH v4 5/5] ref-filter: get_ref_atom_value() error handling Olga Telezhnaya
2018-03-20 18:19         ` Eric Sunshine
2018-03-20 22:30           ` Junio C Hamano
2018-03-20 22:50             ` Eric Sunshine
2018-03-21 19:30               ` Junio C Hamano
2018-03-21 19:58                 ` Eric Sunshine
2018-03-20 16:05       ` [PATCH v4 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-20 18:18         ` Eric Sunshine [this message]
2018-03-20 16:05       ` [PATCH v4 3/5] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-20 16:05       ` [PATCH v4 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-21 18:28       ` [PATCH v5 1/6] strbuf: add shortcut to work with error messages Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 4/6] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-21 20:36           ` Junio C Hamano
2018-03-23  6:56             ` Оля Тележная
2018-03-21 18:28         ` [PATCH v5 5/6] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 3/6] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 6/6] ref-filter: libify get_ref_atom_value() Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 2/6] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-21 20:20         ` [PATCH v5 1/6] strbuf: add shortcut to work with error messages Junio C Hamano
2018-03-23  6:48           ` Оля Тележная
2018-03-29 12:49         ` [PATCH v6 1/6] ref-filter: add shortcut to work with strbufs Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 6/6] ref-filter: libify get_ref_atom_value() Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 5/6] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 3/6] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 4/6] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 2/6] ref-filter: start adding strbufs with errors Olga Telezhnaya

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