"git commit --author=$name" sets the author to one whose name
matches the given string from existing commits, when $name is not in
the "Name <e-mail>" format. However, it does not honor the mailmap
to use the canonical name for the author found this way.

Fix it by telling the logic to find a matching existing author to
honor the mailmap, and use the name and email after applying the

Signed-off-by: Antoine Pelisse <apeli...@gmail.com>
So I kept clear_mailmap() where you put it, but I think it could be moved
right after get_revision(). That is because I think format_commit_message()
will run another read_mailmap() with an heap-allocated string_list.
Anyway, I'm not sure it makes a big difference here.


 builtin/commit.c   |  8 +++++++-
 t/t4203-mailmap.sh | 11 +++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 10acc53..a48a7fe 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -30,6 +30,7 @@
 #include "column.h"
 #include "sequencer.h"
 #include "notes-utils.h"
+#include "mailmap.h"

 static const char * const builtin_commit_usage[] = {
        N_("git commit [options] [--] <pathspec>..."),
@@ -935,6 +936,7 @@ static const char *find_author_by_nickname(const char *name)
        struct rev_info revs;
        struct commit *commit;
        struct strbuf buf = STRBUF_INIT;
+       struct string_list mailmap = STRING_LIST_INIT_NODUP;
        const char *av[20];
        int ac = 0;

@@ -945,13 +947,17 @@ static const char *find_author_by_nickname(const char 
        av[++ac] = buf.buf;
        av[++ac] = NULL;
        setup_revisions(ac, av, &revs, NULL);
+       revs.mailmap = &mailmap;
+       read_mailmap(revs.mailmap, NULL);
        commit = get_revision(&revs);
        if (commit) {
                struct pretty_print_context ctx = {0};
                ctx.date_mode = DATE_NORMAL;
-               format_commit_message(commit, "%an <%ae>", &buf, &ctx);
+               format_commit_message(commit, "%aN <%aE>", &buf, &ctx);
+               clear_mailmap(&mailmap);
                return strbuf_detach(&buf, NULL);
        die(_("No existing author found with '%s'"), name);
diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
index baa4685..4d715f0 100755
--- a/t/t4203-mailmap.sh
+++ b/t/t4203-mailmap.sh
@@ -470,4 +470,15 @@ test_expect_success 'Blame output (complex mapping)' '
        test_cmp expect actual.fuzz

+cat >expect <<\EOF
+Some Dude <s...@dude.xx>
+test_expect_success 'commit --author honors mailmap' '
+       test_must_fail git commit --author "nick" --allow-empty -meight &&
+       git commit --author "Some Dude" --allow-empty -meight &&
+       git show --pretty=format:"%an <%ae>%n" >actual &&
+       test_cmp expect actual

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