Xiaolong Ye <xiaolong.ye@xxxxxxxxx> writes:
> Introduce --base=auto to record the base commit info automatically, the base_commit
> will be the merge base of tip commit of the upstream branch and revision-range
> specified in cmdline.
This line is probably a bit too long.
>
> Helped-by: Junio C Hamano <gitster@xxxxxxxxx>
> Helped-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
> Signed-off-by: Xiaolong Ye <xiaolong.ye@xxxxxxxxx>
> ---
> Documentation/git-format-patch.txt | 4 ++++
> builtin/log.c | 31 +++++++++++++++++++++++++++----
> 2 files changed, 31 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
> index 067d562..d8fe651 100644
> --- a/Documentation/git-format-patch.txt
> +++ b/Documentation/git-format-patch.txt
> @@ -290,6 +290,10 @@ you can use `--suffix=-patch` to get `0001-description-of-my-change-patch`.
> patches for A, B and C, and the identifiers for P, X, Y, Z are appended
> at the end of the _first_ message.
>
> + If set '--base=auto' in cmdline, it will track base commit automatically,
> + the base commit will be the merge base of tip commit of the remote-tracking
> + branch and revision-range specified in cmdline.
> +
> --root::
> Treat the revision argument as a <revision range>, even if it
> is just a single commit (that would normally be treated as a
> diff --git a/builtin/log.c b/builtin/log.c
> index 03cbab0..c5efe73 100644
> --- a/builtin/log.c
> +++ b/builtin/log.c
> @@ -1200,6 +1200,9 @@ static void prepare_bases(struct base_tree_info *bases,
> struct rev_info revs;
> struct diff_options diffopt;
> struct object_id *patch_id;
> + struct branch *curr_branch;
> + struct commit_list *base_list;
> + const char *upstream;
> unsigned char sha1[20];
> int i;
>
> @@ -1207,10 +1210,30 @@ static void prepare_bases(struct base_tree_info *bases,
> DIFF_OPT_SET(&diffopt, RECURSIVE);
> diff_setup_done(&diffopt);
>
> - base = lookup_commit_reference_by_name(base_commit);
> - if (!base)
> - die(_("Unknown commit %s"), base_commit);
> - oidcpy(&bases->base_commit, &base->object.oid);
> + if (!strcmp(base_commit, "auto")) {
> + curr_branch = branch_get(NULL);
Can branch_get() return NULL? Which ...
> + upstream = branch_get_upstream(curr_branch, NULL);
... would cause branch_get_upstream() to give you an error (which
you ignore)? I guess that is OK because upstream will safely be set
to NULL in that case.
> + if (upstream) {
> + if (get_sha1(upstream, sha1))
> + die(_("Failed to resolve '%s' as a valid ref."), upstream);
> + commit = lookup_commit_or_die(sha1, "upstream base");
> + base_list = get_merge_bases_many(commit, total, list);
> + if (!bases)
> + die(_("Could not find merge base."));
> + base = base_list->item;
> + free_commit_list(base_list);
What should happen when there are multiple merge bases? The code
picks one at random and ignores the remainder, if I am reading this
correctly.
> + oidcpy(&bases->base_commit, &base->object.oid);
> + } else {
> + die(_("Failed to get upstream, if you want to record base commit automatically,\n"
> + "please use git branch --set-upstream-to to track a remote branch.\n"
> + "Or you could specify base commit by --base=<base-commit-id> manually."));
> + }
> + } else {
> + base = lookup_commit_reference_by_name(base_commit);
> + if (!base)
> + die(_("Unknown commit %s"), base_commit);
> + oidcpy(&bases->base_commit, &base->object.oid);
> + }
>
> init_revisions(&revs, NULL);
> revs.max_parents = 1;
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