In the same way as there is for_each_ref() to
iterate on refs, it might be useful to have
for_each_mergetag() to iterate on the mergetags
of a given commit.

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 commit.c   | 13 +++++++++++++
 commit.h   |  5 +++++
 log-tree.c | 15 ++++-----------
 3 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/commit.c b/commit.c
index 54e157d..0f83ff7 100644
--- a/commit.c
+++ b/commit.c
@@ -1348,6 +1348,19 @@ struct commit_extra_header 
*read_commit_extra_headers(struct commit *commit,
        return extra;
 }
 
+void for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data)
+{
+       struct commit_extra_header *extra, *to_free;
+
+       to_free = read_commit_extra_headers(commit, NULL);
+       for (extra = to_free; extra; extra = extra->next) {
+               if (strcmp(extra->key, "mergetag"))
+                       continue; /* not a merge tag */
+               fn(commit, extra, data);
+       }
+       free_commit_extra_headers(to_free);
+}
+
 static inline int standard_header_field(const char *field, size_t len)
 {
        return ((len == 4 && !memcmp(field, "tree ", 5)) ||
diff --git a/commit.h b/commit.h
index 4234dae..c81ba85 100644
--- a/commit.h
+++ b/commit.h
@@ -312,6 +312,11 @@ extern struct commit_extra_header 
*read_commit_extra_headers(struct commit *, co
 
 extern void free_commit_extra_headers(struct commit_extra_header *extra);
 
+typedef void (*each_mergetag_fn)(struct commit *commit, struct 
commit_extra_header *extra,
+                                void *cb_data);
+
+extern void for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void 
*data);
+
 struct merge_remote_desc {
        struct object *obj; /* the named object, could be a tag */
        const char *name;
diff --git a/log-tree.c b/log-tree.c
index 10e6844..706ed4c 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -413,10 +413,11 @@ static int is_common_merge(const struct commit *commit)
                && !commit->parents->next->next);
 }
 
-static void show_one_mergetag(struct rev_info *opt,
+static void show_one_mergetag(struct commit *commit,
                              struct commit_extra_header *extra,
-                             struct commit *commit)
+                             void *data)
 {
+       struct rev_info *opt = (struct rev_info *)data;
        unsigned char sha1[20];
        struct tag *tag;
        struct strbuf verify_message;
@@ -463,15 +464,7 @@ static void show_one_mergetag(struct rev_info *opt,
 
 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 {
-       struct commit_extra_header *extra, *to_free;
-
-       to_free = read_commit_extra_headers(commit, NULL);
-       for (extra = to_free; extra; extra = extra->next) {
-               if (strcmp(extra->key, "mergetag"))
-                       continue; /* not a merge tag */
-               show_one_mergetag(opt, extra, commit);
-       }
-       free_commit_extra_headers(to_free);
+       for_each_mergetag(show_one_mergetag, commit, opt);
 }
 
 void show_log(struct rev_info *opt)
-- 
2.0.0.421.g786a89d.dirty


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