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[PATCH] ref-filter: allow merged and no-merged filters

From
Aaron Lipman <alipman88@gmail.com>
Date
Sep 8, 2020, 15:37 UTC
Message-ID
<20200908153759.36504-1-alipman88@gmail.com>

Enable ref-filter to process multiple merged and no-merged filters, and extend functionality to git branch, git tag and git for-each-ref. This provides an easy way to check for branches that are "graduation candidates:"

$ git branch --no-merged master --merged next

To accomplish this, store the merged and no-merged filters in two commit_list structs (reachable_from and unreachable_from) rather than using a single commit struct (merge_commit).

If passed more than one merged (or more than one no-merged) filter, mirror the existing boolean logic used by contains/no-contains filters: refs must satisfy any of the merged filters, and all of the no-merged filters.

Signed-off-by: Aaron Lipman <alipman88@gmail.com>
---
This functionality was originally proposed in 2013:
https://lore.kernel.org/git/87fvzwmp23.fsf@59A2.org/T/

In deciding how to handle multiple merged or multiple no-merged filters, I mirrored the existing behavior for contains/no-contains filters. However, I noticed this existing behavior isn't documented or covered by tests. I think it makes sense to hold off on officially documenting this behavior for now in case we wish to refine it later, but I'm curious what others think.

If merging into next, please be sure to also include my previous patch correcting tests in t3200: https://lore.kernel.org/git/20200830224200.21103-1-alipman88@gmail.com

(Apologies, realizing I should have submitted both together.)
 Documentation/git-branch.txt       |  6 +--
 Documentation/git-for-each-ref.txt |  6 +--
 Documentation/git-tag.txt          |  4 +-
 builtin/branch.c                   |  4 +-
 builtin/tag.c                      |  6 +--
 ref-filter.c                       | 71 ++++++++++++++++--------------
 ref-filter.h                       |  9 +---
 t/t3200-branch.sh                  |  4 +-
 t/t3201-branch-contains.sh         | 12 +++++
 t/t6302-for-each-ref-filter.sh     |  4 +-
 t/t7004-tag.sh                     |  2 +-
 11 files changed, 68 insertions(+), 60 deletions(-)
diff --git a/Documentation/git-branch.txt b/Documentation/git-branch.txt
index 03c0824d52..8f0dbcd0ac 100644
--- a/Documentation/git-branch.txt
+++ b/Documentation/git-branch.txt
@@ -252,13 +252,11 @@ start-point is either a local or remote-tracking branch.
 
 --merged [<commit>]::
 	Only list branches whose tips are reachable from the
-	specified commit (HEAD if not specified). Implies `--list`,
-	incompatible with `--no-merged`.
+	specified commit (HEAD if not specified). Implies `--list`.
 
 --no-merged [<commit>]::
 	Only list branches whose tips are not reachable from the
-	specified commit (HEAD if not specified). Implies `--list`,
-	incompatible with `--merged`.
+	specified commit (HEAD if not specified). Implies `--list`.
 
 <branchname>::
 	The name of the branch to create or delete.
diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index 2ea71c5f6c..bb113da5a2 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -76,13 +76,11 @@ OPTIONS
 
 --merged[=<object>]::
 	Only list refs whose tips are reachable from the
-	specified commit (HEAD if not specified),
-	incompatible with `--no-merged`.
+	specified commit (HEAD if not specified).
 
 --no-merged[=<object>]::
 	Only list refs whose tips are not reachable from the
-	specified commit (HEAD if not specified),
-	incompatible with `--merged`.
+	specified commit (HEAD if not specified).
 
 --contains[=<object>]::
 	Only list refs which contain the specified commit (HEAD if not
diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index f6d9791780..786d4dfd6f 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -149,11 +149,11 @@ This option is only applicable when listing tags without annotation lines.
 
 --merged [<commit>]::
 	Only list tags whose commits are reachable from the specified
-	commit (`HEAD` if not specified), incompatible with `--no-merged`.
+	commit (`HEAD` if not specified).
 
 --no-merged [<commit>]::
 	Only list tags whose commits are not reachable from the specified
-	commit (`HEAD` if not specified), incompatible with `--merged`.
+	commit (`HEAD` if not specified).
 
 --points-at <object>::
 	Only list tags of the given object (HEAD if not
diff --git a/builtin/branch.c b/builtin/branch.c
index e82301fb1b..4bdb700dd5 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -688,8 +688,8 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 	    !show_current && !unset_upstream && argc == 0)
 		list = 1;
 
-	if (filter.with_commit || filter.merge != REF_FILTER_MERGED_NONE || filter.points_at.nr ||
-	    filter.no_commit)
+	if (filter.with_commit || filter.no_commit ||
+	    filter.reachable_from || filter.unreachable_from || filter.points_at.nr)
 		list = 1;
 
 	if (!!delete + !!rename + !!copy + !!new_upstream + !!show_current +
diff --git a/builtin/tag.c b/builtin/tag.c
index 5cbd80dc3e..b1a0398c85 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -457,8 +457,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 		if (argc == 0)
 			cmdmode = 'l';
 		else if (filter.with_commit || filter.no_commit ||
-			 filter.points_at.nr || filter.merge_commit ||
-			 filter.lines != -1)
+			 filter.reachable_from || filter.unreachable_from ||
+			 filter.points_at.nr || filter.lines != -1)
 			cmdmode = 'l';
 	}
 
@@ -509,7 +509,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 		die(_("--no-contains option is only allowed in list mode"));
 	if (filter.points_at.nr)
 		die(_("--points-at option is only allowed in list mode"));
-	if (filter.merge_commit)
+	if (filter.reachable_from || filter.unreachable_from)
 		die(_("--merged and --no-merged options are only allowed in list mode"));
 	if (cmdmode == 'd')
 		return for_each_tag_name(argv, delete_tag, NULL);
diff --git a/ref-filter.c b/ref-filter.c
index 8ba0e31915..21dca5e68b 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2119,9 +2119,9 @@ static int ref_filter_handler(const char *refname, const struct object_id *oid,
 	 * obtain the commit using the 'oid' available and discard all
 	 * non-commits early. The actual filtering is done later.
 	 */
-	if (filter->merge_commit || filter->with_commit || filter->no_commit || filter->verbose) {
-		commit = lookup_commit_reference_gently(the_repository, oid,
-							1);
+	if (filter->reachable_from || filter->unreachable_from ||
+	    filter->with_commit || filter->no_commit || filter->verbose) {
+		commit = lookup_commit_reference_gently(the_repository, oid, 1);
 		if (!commit)
 			return 0;
 		/* We perform the filtering for the '--contains' option... */
@@ -2183,11 +2183,17 @@ void ref_array_clear(struct ref_array *array)
 	}
 }
 
-static void do_merge_filter(struct ref_filter_cbdata *ref_cbdata)
+static void do_merge_filter(struct ref_filter_cbdata *ref_cbdata, int reachable)
 {
+	struct commit_list *check_reachable_list = reachable ?
+		ref_cbdata->filter->reachable_from :
+		ref_cbdata->filter->unreachable_from;
+
+	if (!check_reachable_list)
+		return;
+
 	struct rev_info revs;
 	int i, old_nr;
-	struct ref_filter *filter = ref_cbdata->filter;
 	struct ref_array *array = ref_cbdata->array;
 	struct commit **to_clear = xcalloc(sizeof(struct commit *), array->nr);
 
@@ -2199,12 +2205,15 @@ static void do_merge_filter(struct ref_filter_cbdata *ref_cbdata)
 		to_clear[i] = item->commit;
 	}
 
-	filter->merge_commit->object.flags |= UNINTERESTING;
-	add_pending_object(&revs, &filter->merge_commit->object, "");
+	for (struct commit_list *rl = check_reachable_list; rl; rl = rl->next) {
+		struct commit *merge_commit = rl->item;
+		merge_commit->object.flags |= UNINTERESTING;
+		add_pending_object(&revs, &merge_commit->object, "");
 
-	revs.limited = 1;
-	if (prepare_revision_walk(&revs))
-		die(_("revision walk setup failed"));
+		revs.limited = 1;
+		if (prepare_revision_walk(&revs))
+			die(_("revision walk setup failed"));
+	}
 
 	old_nr = array->nr;
 	array->nr = 0;
@@ -2215,14 +2224,19 @@ static void do_merge_filter(struct ref_filter_cbdata *ref_cbdata)
 
 		int is_merged = !!(commit->object.flags & UNINTERESTING);
 
-		if (is_merged == (filter->merge == REF_FILTER_MERGED_INCLUDE))
+		if (is_merged == reachable)
 			array->items[array->nr++] = array->items[i];
 		else
 			free_array_item(item);
-	}
+  }
 
 	clear_commit_marks_many(old_nr, to_clear, ALL_REV_FLAGS);
-	clear_commit_marks(filter->merge_commit, ALL_REV_FLAGS);
+
+	while (check_reachable_list) {
+		struct commit *merge_commit = pop_commit(&check_reachable_list);
+		clear_commit_marks(merge_commit, ALL_REV_FLAGS);
+	}
+
 	free(to_clear);
 }
 
@@ -2274,8 +2288,8 @@ int filter_refs(struct ref_array *array, struct ref_filter *filter, unsigned int
 	clear_contains_cache(&ref_cbdata.no_contains_cache);
 
 	/*  Filters that need revision walking */
-	if (filter->merge_commit)
-		do_merge_filter(&ref_cbdata);
+	do_merge_filter(&ref_cbdata, 1);
+	do_merge_filter(&ref_cbdata, 0);
 
 	return ret;
 }
@@ -2493,31 +2507,22 @@ int parse_opt_merge_filter(const struct option *opt, const char *arg, int unset)
 {
 	struct ref_filter *rf = opt->value;
 	struct object_id oid;
-	int no_merged = starts_with(opt->long_name, "no");
 
 	BUG_ON_OPT_NEG(unset);
 
-	if (rf->merge) {
-		if (no_merged) {
-			return error(_("option `%s' is incompatible with --merged"),
-				     opt->long_name);
-		} else {
-			return error(_("option `%s' is incompatible with --no-merged"),
-				     opt->long_name);
-		}
-	}
-
-	rf->merge = no_merged
-		? REF_FILTER_MERGED_OMIT
-		: REF_FILTER_MERGED_INCLUDE;
-
 	if (get_oid(arg, &oid))
 		die(_("malformed object name %s"), arg);
 
-	rf->merge_commit = lookup_commit_reference_gently(the_repository,
-							  &oid, 0);
-	if (!rf->merge_commit)
+	struct commit *merge_commit = lookup_commit_reference_gently(the_repository,
+								     &oid, 0);
+
+	if (!merge_commit)
 		return error(_("option `%s' must point to a commit"), opt->long_name);
 
+	if (starts_with(opt->long_name, "no"))
+		commit_list_insert(merge_commit, &rf->unreachable_from);
+	else
+		commit_list_insert(merge_commit, &rf->reachable_from);
+
 	return 0;
 }
diff --git a/ref-filter.h b/ref-filter.h
index 8ecc33cdfa..feaef4a8fd 100644
--- a/ref-filter.h
+++ b/ref-filter.h
@@ -54,13 +54,8 @@ struct ref_filter {
 	struct oid_array points_at;
 	struct commit_list *with_commit;
 	struct commit_list *no_commit;
-
-	enum {
-		REF_FILTER_MERGED_NONE = 0,
-		REF_FILTER_MERGED_INCLUDE,
-		REF_FILTER_MERGED_OMIT
-	} merge;
-	struct commit *merge_commit;
+	struct commit_list *reachable_from;
+	struct commit_list *unreachable_from;
 
 	unsigned int with_commit_tag_algo : 1,
 		match_as_path : 1,
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 028c88d1b2..be8f61b751 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -1299,8 +1299,8 @@ test_expect_success '--merged catches invalid object names' '
 	test_must_fail git branch --merged 0000000000000000000000000000000000000000
 '
 
-test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git branch --merged HEAD --no-merged HEAD
+test_expect_success '--merged is compatible with --no-merged' '
+	git branch --merged master --no-merged master
 '
 
 test_expect_success '--list during rebase' '
diff --git a/t/t3201-branch-contains.sh b/t/t3201-branch-contains.sh
index 40251c9f8f..6e73789995 100755
--- a/t/t3201-branch-contains.sh
+++ b/t/t3201-branch-contains.sh
@@ -211,4 +211,16 @@ test_expect_success 'branch --contains combined with --no-contains' '
 
 '
 
+test_expect_success 'branch --merged combined with --no-merged' '
+	git checkout master &&
+	git checkout -b next &&
+	git merge side &&
+	git branch --merged next --no-merged master >actual &&
+	cat >expect <<-\EOF &&
+	* next
+	  side
+	EOF
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6302-for-each-ref-filter.sh b/t/t6302-for-each-ref-filter.sh
index 35408d53fd..781e470aea 100755
--- a/t/t6302-for-each-ref-filter.sh
+++ b/t/t6302-for-each-ref-filter.sh
@@ -437,8 +437,8 @@ test_expect_success 'check %(if:notequals=<string>)' '
 	test_cmp expect actual
 '
 
-test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git for-each-ref --merged HEAD --no-merged HEAD
+test_expect_success '--merged is compatible with --no-merged' '
+	git for-each-ref --merged HEAD --no-merged HEAD
 '
 
 test_expect_success 'validate worktree atom' '
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 74b637deb2..7d544eceda 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -2016,7 +2016,7 @@ test_expect_success '--merged can be used in non-list mode' '
 '
 
 test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git tag --merged HEAD --no-merged HEAD
+	git tag --merged HEAD --no-merged HEAD
 '
 
 test_expect_success '--merged shows merged tags' '

-- 
2.24.3 (Apple Git-128)
Next: Junio C Hamano
Message 1 of 36 in “ref-filter: allow merged and no-merged filters”
  1. ref-filter: allow merged and no-merged filtersAaron Lipman, Sep 8, 2020
  2. Junio C HamanoSep 8, 2020
  3. Aaron LipmanSep 8, 2020
  4. Junio C HamanoSep 9, 2020
  5. 0/2 git branch: allow combining merged and no-merged filtersAaron Lipman, Sep 11, 2020
  6. 1/2 t3201: test multiple branch filter combinationsAaron Lipman, Sep 11, 2020
  7. 2/2 ref-filter: allow merged and no-merged filtersAaron Lipman, Sep 11, 2020
  8. Junio C HamanoSep 11, 2020
  9. 0/3 git branch: allow combining merged and no-merged filtersAaron Lipman, Sep 13, 2020
  10. 1/3 t3201: test multiple branch filter combinationsAaron Lipman, Sep 13, 2020
  11. Eric SunshineSep 13, 2020
  12. Junio C HamanoSep 14, 2020
  13. 2/3 Doc: cover multiple contains/no-contains filtersAaron Lipman, Sep 13, 2020
  14. Eric SunshineSep 13, 2020
  15. Junio C HamanoSep 14, 2020
  16. 3/3 ref-filter: allow merged and no-merged filtersAaron Lipman, Sep 13, 2020
  17. Eric SunshineSep 13, 2020
  18. Junio C HamanoSep 13, 2020
  19. Eric SunshineSep 13, 2020
  20. 0/3 git branch: allow combining merged and no-merged filtersAaron Lipman, Sep 16, 2020
  21. 1/3 t3201: test multiple branch filter combinationsAaron Lipman, Sep 16, 2020
  22. 2/3 Doc: cover multiple contains/no-contains filtersAaron Lipman, Sep 16, 2020
  23. Junio C HamanoSep 16, 2020
  24. 3/3 ref-filter: allow merged and no-merged filtersAaron Lipman, Sep 16, 2020
  25. Junio C HamanoSep 16, 2020
  26. Eric SunshineSep 16, 2020
  27. 0/2 ref-filter: merged & no-merged touch-upsAaron Lipman, Sep 18, 2020
  28. 1/2 ref-filter: refactor do_merge_filter()Aaron Lipman, Sep 18, 2020
  29. Eric SunshineSep 18, 2020
  30. Eric SunshineSep 18, 2020
  31. Junio C HamanoSep 18, 2020
  32. 2/2 Doc: prefer more specific file nameAaron Lipman, Sep 18, 2020
  33. Eric SunshineSep 18, 2020
  34. 0/2 ref-filter: merged & no-merged touch-upsAaron Lipman, Sep 18, 2020
  35. 1/2 ref-filter: make internal reachable-filter API more preciseAaron Lipman, Sep 18, 2020
  36. 2/2 Doc: prefer more specific file nameAaron Lipman, Sep 18, 2020

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