git-log --first-parent: show only the first parent log

diff --git a/revision.c b/revision.c
index 3c2eb125e6e9332fe32be9bcec6fb2005228c211..8afc1968470c88827a2c3da05ece345520b2d336 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -350,6 +350,7 @@ static void add_parents_to_list(struct rev_info *revs, struct commit *commit, st
 {
        struct commit_list *parent = commit->parents;
        unsigned left_flag;
+       int add, rest;
 
        if (commit->object.flags & ADDED)
                return;
@@ -395,18 +396,19 @@ static void add_parents_to_list(struct rev_info *revs, struct commit *commit, st
                return;
 
        left_flag = (commit->object.flags & SYMMETRIC_LEFT);
-       parent = commit->parents;
-       while (parent) {
+
+       rest = !revs->first_parent_only;
+       for (parent = commit->parents, add = 1; parent; add = rest) {
                struct commit *p = parent->item;
 
                parent = parent->next;
-
                parse_commit(p);
                p->object.flags |= left_flag;
                if (p->object.flags & SEEN)
                        continue;
                p->object.flags |= SEEN;
-               insert_by_date(p, list);
+               if (add)
+                       insert_by_date(p, list);
        }
 }
 
@@ -836,6 +838,10 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
                                handle_all(revs, flags);
                                continue;
                        }
+                       if (!strcmp(arg, "--first-parent")) {
+                               revs->first_parent_only = 1;
+                               continue;
+                       }
                        if (!strcmp(arg, "--reflog")) {
                                handle_reflog(revs, flags);
                                continue;