Since 3f01ad6 (am: Add --committer-date-is-author-date option,
2009-01-22), git-am.sh implemented the --committer-date-is-author-date
option, which tells git-am to use the timestamp recorded in the email
message as both author and committer date.

Re-implement this option in builtin/am.c.

Signed-off-by: Paul Tan <pyoka...@gmail.com>
---
 builtin/am.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 6623b49..608a2da 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -130,6 +130,8 @@ struct am_state {
        /* override error message when patch failure occurs */
        const char *resolvemsg;
 
+       int committer_date_is_author_date;
+
        int ignore_date;
 
        int rebasing;
@@ -1136,6 +1138,10 @@ static void do_commit(const struct am_state *state)
                        state->ignore_date ? NULL : state->author_date.buf,
                        IDENT_STRICT);
 
+       if (state->committer_date_is_author_date)
+               setenv("GIT_COMMITTER_DATE",
+                       state->ignore_date ? "" : state->author_date.buf, 1);
+
        if (commit_tree(state->msg.buf, state->msg.len, tree, parents, commit,
                                author, NULL))
                die(_("failed to write commit object"));
@@ -1524,6 +1530,9 @@ static struct option am_options[] = {
        OPT_CMDMODE(0, "abort", &opt_resume,
                N_("restore the original branch and abort the patching 
operation."),
                RESUME_ABORT),
+       OPT_BOOL(0, "committer-date-is-author-date",
+               &state.committer_date_is_author_date,
+               N_("lie about committer date")),
        OPT_BOOL(0, "ignore-date", &state.ignore_date,
                N_("use current timestamp for author date")),
        OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
-- 
2.1.4

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