[PATCH v6 2/4] branch: let delete_branches() name where a branch landed

["Harald Nordgren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Harald Nordgren <haraldnordgren@gmail.com>

A later commit lets "git branch" delete branches whose commits are not
in their upstream but whose changes are, such as after a squash merge.
Their tips are not reachable from the upstream, so the merge check in
delete_branches() would refuse to delete them, and the output should
say where their changes went.

Let delete_branches() take a map from branch names to the upstream
commit where each branch landed. A branch in the map skips the merge
check and is reported as

    Deleted branch topic (was 1a2b3c4, landed as 9f8e7d6).

No caller passes a map yet, so there is no change in behavior.

Signed-off-by: Harald Nordgren <haraldnordgren@gmail.com>
---
 builtin/branch.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/builtin/branch.c b/builtin/branch.c
index 171b13b081..99b0dd45e9 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -236,7 +236,7 @@ static void delete_branch_config(const char *branchname)
 }
 
 static int delete_branches(int argc, const char **argv, int kinds,
-			   unsigned int flags)
+			   unsigned int flags, struct strmap *landed_commits)
 {
 	struct commit *head_rev = NULL;
 	struct object_id oid;
@@ -334,6 +334,8 @@ static int delete_branches(int argc, const char **argv, int kinds,
 		}
 
 		if (!(ref_flags & (REF_ISSYMREF|REF_ISBROKEN)) &&
+		    !(landed_commits &&
+		      strmap_contains(landed_commits, bname.buf)) &&
 		    check_branch_commit(bname.buf, name, &oid, head_rev, kinds,
 					flags)) {
 			if (!(flags & DELETE_BRANCH_SKIP_UNMERGED))
@@ -357,15 +359,33 @@ static int delete_branches(int argc, const char **argv, int kinds,
 	for_each_string_list_item(item, &refs_to_delete) {
 		char *describe_ref = item->util;
 		char *name = item->string;
+		struct commit *landed = landed_commits ?
+			strmap_get(landed_commits, name + branch_name_pos) : NULL;
+		const char *landed_abbrev = landed ?
+			repo_find_unique_abbrev(the_repository,
+						&landed->object.oid,
+						DEFAULT_ABBREV) : NULL;
+
 		if (flags & DELETE_BRANCH_DRY_RUN) {
-			if (!(flags & DELETE_BRANCH_QUIET))
+			if (flags & DELETE_BRANCH_QUIET)
+				;
+			else if (landed)
+				printf(_("Would delete branch %s (was %s, landed as %s).\n"),
+				       name + branch_name_pos, describe_ref,
+				       landed_abbrev);
+			else
 				printf(remote_branch
 					? _("Would delete remote-tracking branch %s (was %s).\n")
 					: _("Would delete branch %s (was %s).\n"),
 					name + branch_name_pos, describe_ref);
 		} else if (!refs_ref_exists(get_main_ref_store(the_repository), name)) {
 			char *refname = name + branch_name_pos;
-			if (!(flags & DELETE_BRANCH_QUIET))
+			if (flags & DELETE_BRANCH_QUIET)
+				;
+			else if (landed)
+				printf(_("Deleted branch %s (was %s, landed as %s).\n"),
+				       refname, describe_ref, landed_abbrev);
+			else
 				printf(remote_branch
 					? _("Deleted remote-tracking branch %s (was %s).\n")
 					: _("Deleted branch %s (was %s).\n"),
@@ -901,7 +921,7 @@ static int delete_merged_branches(const struct strvec *upstreams,
 				      FILTER_REFS_BRANCHES,
 				      DELETE_BRANCH_SKIP_UNMERGED |
 				      DELETE_BRANCH_NO_HEAD_FALLBACK |
-				      flags);
+				      flags, NULL);
 
 	if (!ret && !(flags & DELETE_BRANCH_DRY_RUN))
 		clear_deleted_upstreams(&protected_branch_names,
@@ -1141,7 +1161,7 @@ int cmd_branch(int argc,
 			die(_("branch name required"));
 		ret = delete_branches(argc, argv, filter.kind,
 				      (delete > 1 ? DELETE_BRANCH_FORCE : 0) |
-				      (quiet ? DELETE_BRANCH_QUIET : 0));
+				      (quiet ? DELETE_BRANCH_QUIET : 0), NULL);
 		goto out;
 	} else if (delete_merged.nr) {
 		ret = delete_merged_branches(&delete_merged, argv,
-- 
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