Re: [PATCH v4 3/4] notes: add notes.merge option to select default strategy

> From: Jacob Keller <jacob.keller@gmail.com>
>
> Teach git-notes about "notes.merge" to select a general strategy for all
> notes merges. This enables a user to always get expected merge strategy
> such as "cat_sort_uniq" without having to pass the "-s" option manually.
>
> Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
> ---
>  Documentation/config.txt            |  7 ++++++
>  Documentation/git-notes.txt         | 14 +++++++++++-
>  builtin/notes.c                     | 44 +++++++++++++++++++++++--------------
>  notes-merge.h                       | 16 ++++++++------
>  t/t3309-notes-merge-auto-resolve.sh | 29 ++++++++++++++++++++++++
>  5 files changed, 86 insertions(+), 24 deletions(-)
>

> diff --git a/builtin/notes.c b/builtin/notes.c
> index 63f95fc55439..3c705f5e26ff 100644
> --- a/builtin/notes.c
> +++ b/builtin/notes.c
> @@ -737,6 +737,24 @@ static int merge_commit(struct notes_merge_options *o)
>         return ret;
>  }
>
> +static int parse_notes_strategy(const char *arg, enum notes_merge_strategy *strategy)
> +{
> +       if (!strcmp(arg, "manual"))
> +               *strategy = NOTES_MERGE_RESOLVE_MANUAL;
> +       else if (!strcmp(arg, "ours"))
> +               *strategy = NOTES_MERGE_RESOLVE_OURS;
> +       else if (!strcmp(arg, "theirs"))
> +               *strategy = NOTES_MERGE_RESOLVE_THEIRS;
> +       else if (!strcmp(arg, "union"))
> +               *strategy = NOTES_MERGE_RESOLVE_UNION;
> +       else if (!strcmp(arg, "cat_sort_uniq"))
> +               *strategy = NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ;
> +       else
> +               return -1;
> +
> +       return 0;
> +}
> +
>  static int merge(int argc, const char **argv, const char *prefix)
>  {
>         struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
> @@ -745,7 +763,7 @@ static int merge(int argc, const char **argv, const char *prefix)
>         struct notes_merge_options o;
>         int do_merge = 0, do_commit = 0, do_abort = 0;
>         int verbosity = 0, result;
> -       const char *strategy = NULL;
> +       const char *strategy = NULL, *configured_strategy = NULL;
>         struct option options[] = {
>                 OPT_GROUP(N_("General options")),
>                 OPT__VERBOSITY(&verbosity),
> @@ -795,21 +813,15 @@ static int merge(int argc, const char **argv, const char *prefix)
>         expand_notes_ref(&remote_ref);
>         o.remote_ref = remote_ref.buf;
>
> -       if (strategy) {
> -               if (!strcmp(strategy, "manual"))
> -                       o.strategy = NOTES_MERGE_RESOLVE_MANUAL;
> -               else if (!strcmp(strategy, "ours"))
> -                       o.strategy = NOTES_MERGE_RESOLVE_OURS;
> -               else if (!strcmp(strategy, "theirs"))
> -                       o.strategy = NOTES_MERGE_RESOLVE_THEIRS;
> -               else if (!strcmp(strategy, "union"))
> -                       o.strategy = NOTES_MERGE_RESOLVE_UNION;
> -               else if (!strcmp(strategy, "cat_sort_uniq"))
> -                       o.strategy = NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ;
> -               else {
> -                       error("Unknown -s/--strategy: %s", strategy);
> -                       usage_with_options(git_notes_merge_usage, options);
> -               }
> +       git_config_get_string_const("notes.merge", &configured_strategy);
> +
> +       if (configured_strategy &&
> +           parse_notes_strategy(configured_strategy, &o.strategy))
> +               die("Unknown notes merge strategy: %s", configured_strategy);
> +
> +       if (strategy && parse_notes_strategy(strategy, &o.strategy)) {
> +               error("Unknown -s/--strategy: %s", strategy);
> +               usage_with_options(git_notes_merge_usage, options);
>         }