From: Derrick Stolee <dsto...@microsoft.com>

There are a few things that need to move around a little before
making a big refactoring in the topo-order logic:

1. We need access to record_author_date() and
   compare_commits_by_author_date() in revision.c. These are used
   currently by sort_in_topological_order() in commit.c.

2. Moving these methods to commit.h requires adding the author_slab
   definition to commit.h.

3. The add_parents_to_list() method in revision.c performs logic
   around the UNINTERESTING flag and other special cases depending
   on the struct rev_info. Allow this method to ignore a NULL 'list'
   parameter, as we will not be populating the list for our walk.

Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
 commit.c   | 11 ++++-------
 commit.h   |  8 ++++++++
 revision.c |  6 ++++--
 3 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/commit.c b/commit.c
index d0f199e122..f68e04b2f1 100644
--- a/commit.c
+++ b/commit.c
@@ -655,11 +655,8 @@ struct commit *pop_commit(struct commit_list **stack)
 /* count number of children that have not been emitted */
 define_commit_slab(indegree_slab, int);
 
-/* record author-date for each commit object */
-define_commit_slab(author_date_slab, timestamp_t);
-
-static void record_author_date(struct author_date_slab *author_date,
-                              struct commit *commit)
+void record_author_date(struct author_date_slab *author_date,
+                       struct commit *commit)
 {
        const char *buffer = get_commit_buffer(commit, NULL);
        struct ident_split ident;
@@ -684,8 +681,8 @@ fail_exit:
        unuse_commit_buffer(commit, buffer);
 }
 
-static int compare_commits_by_author_date(const void *a_, const void *b_,
-                                         void *cb_data)
+int compare_commits_by_author_date(const void *a_, const void *b_,
+                                  void *cb_data)
 {
        const struct commit *a = a_, *b = b_;
        struct author_date_slab *author_date = cb_data;
diff --git a/commit.h b/commit.h
index 2b1a734388..ff0eb5f8ef 100644
--- a/commit.h
+++ b/commit.h
@@ -8,6 +8,7 @@
 #include "gpg-interface.h"
 #include "string-list.h"
 #include "pretty.h"
+#include "commit-slab.h"
 
 #define COMMIT_NOT_FROM_GRAPH 0xFFFFFFFF
 #define GENERATION_NUMBER_INFINITY 0xFFFFFFFF
@@ -328,6 +329,13 @@ extern int remove_signature(struct strbuf *buf);
  */
 extern int check_commit_signature(const struct commit *commit, struct 
signature_check *sigc);
 
+/* record author-date for each commit object */
+define_commit_slab(author_date_slab, timestamp_t);
+
+void record_author_date(struct author_date_slab *author_date,
+                       struct commit *commit);
+
+int compare_commits_by_author_date(const void *a_, const void *b_, void 
*unused);
 int compare_commits_by_commit_date(const void *a_, const void *b_, void 
*unused);
 int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_, 
void *unused);
 
diff --git a/revision.c b/revision.c
index 2dcde8a8ac..92012d5f45 100644
--- a/revision.c
+++ b/revision.c
@@ -808,7 +808,8 @@ static int add_parents_to_list(struct rev_info *revs, 
struct commit *commit,
                        if (p->object.flags & SEEN)
                                continue;
                        p->object.flags |= SEEN;
-                       commit_list_insert_by_date_cached(p, list, cached_base, 
cache_ptr);
+                       if (list)
+                               commit_list_insert_by_date_cached(p, list, 
cached_base, cache_ptr);
                }
                return 0;
        }
@@ -847,7 +848,8 @@ static int add_parents_to_list(struct rev_info *revs, 
struct commit *commit,
                p->object.flags |= left_flag;
                if (!(p->object.flags & SEEN)) {
                        p->object.flags |= SEEN;
-                       commit_list_insert_by_date_cached(p, list, cached_base, 
cache_ptr);
+                       if (list)
+                               commit_list_insert_by_date_cached(p, list, 
cached_base, cache_ptr);
                }
                if (revs->first_parent_only)
                        break;
-- 
gitgitgadget

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