[PATCH v2 04/33] revision: provide implementation for diff merges tweaks

[Sergey Organov <sorganov@xxxxxxxxx>]

Use these implementations from show_setup_revisions_tweak() and
log_setup_revisions_tweak() in builtin/log.c.

This completes moving of management of diff merges parameters to a
single place, where we can finally observe them simultaneously.

Signed-off-by: Sergey Organov <sorganov@xxxxxxxxx>
---
 builtin/log.c | 13 ++-----------
 revision.c    | 17 +++++++++++++++++
 revision.h    |  3 +++
 3 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/builtin/log.c b/builtin/log.c
index 0a7ed4bef92b..717855a49e90 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -598,15 +598,7 @@ static int show_tree_object(const struct object_id *oid,
 static void show_setup_revisions_tweak(struct rev_info *rev,
 				       struct setup_revision_opt *opt)
 {
-	if (rev->ignore_merges < 0) {
-		/* There was no "-m" variant on the command line */
-		rev->ignore_merges = 0;
-		if (!rev->first_parent_only && !rev->combine_merges) {
-			/* No "--first-parent", "-c", or "--cc" */
-			rev->combine_merges = 1;
-			rev->dense_combined_merges = 1;
-		}
-	}
+	rev_diff_merges_default_to_dense_combined(rev);
 	if (!rev->diffopt.output_format)
 		rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 }
@@ -731,8 +723,7 @@ static void log_setup_revisions_tweak(struct rev_info *rev,
 	if (!rev->diffopt.output_format && rev->combine_merges)
 		rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 
-	if (rev->first_parent_only && rev->ignore_merges < 0)
-		rev->ignore_merges = 0;
+	rev_diff_merges_first_parent_defaults_to_enable(rev);
 }
 
 int cmd_log(int argc, const char **argv, const char *prefix)
diff --git a/revision.c b/revision.c
index da82663c8ce1..7b5b59a3c848 100644
--- a/revision.c
+++ b/revision.c
@@ -2207,6 +2207,23 @@ static void setup_diff_merges_revs(struct rev_info *revs)
 		die("--combined-all-paths makes no sense without -c or --cc");
 }
 
+void rev_diff_merges_first_parent_defaults_to_enable(struct rev_info *revs) {
+	if (revs->first_parent_only && revs->ignore_merges < 0)
+		revs->ignore_merges = 0;
+}
+
+void rev_diff_merges_default_to_dense_combined(struct rev_info *revs) {
+	if (revs->ignore_merges < 0) {
+		/* There was no "-m" variant on the command line */
+		revs->ignore_merges = 0;
+		if (!revs->first_parent_only && !revs->combine_merges) {
+			/* No "--first-parent", "-c", or "--cc" */
+			revs->combine_merges = 1;
+			revs->dense_combined_merges = 1;
+		}
+	}
+}
+
 static int handle_revision_opt(struct rev_info *revs, int argc, const char **argv,
 			       int *unkc, const char **unkv,
 			       const struct setup_revision_opt* opt)
diff --git a/revision.h b/revision.h
index f6bf860d19e5..3dd0229f4edc 100644
--- a/revision.h
+++ b/revision.h
@@ -456,4 +456,7 @@ int rewrite_parents(struct rev_info *revs,
  */
 struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit);
 
+void rev_diff_merges_default_to_dense_combined(struct rev_info *revs);
+void rev_diff_merges_first_parent_defaults_to_enable(struct rev_info *revs);
+
 #endif
-- 
2.25.1