Since the current output is not in any guaranteed order, changing the
output ordering should not break anything.

This is one of the easy cases, since we are already making a complete
pass of the matches and storing them in a hash table.
---
 notmuch-search.c     | 19 +++++++++++++++----
 test/T095-address.sh | 28 ++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/notmuch-search.c b/notmuch-search.c
index 47eec601..ff3967fd 100644
--- a/notmuch-search.c
+++ b/notmuch-search.c
@@ -64,6 +64,7 @@ typedef struct {
     int limit;
     int dupe;
     GHashTable *addresses;
+    GList *output_mailboxes;
     int dedup;
 } search_context_t;
 
@@ -507,14 +508,20 @@ print_list_value (void *mailbox, void *context)
     print_mailbox (context, mailbox);
 }
 
+static gint
+compare_count (gconstpointer a, gconstpointer b)
+{
+    return ((mailbox_t *) b)->count - ((mailbox_t *) a)->count;
+}
+
 static void
-print_hash_value (unused (void *key), void *list, void *context)
+process_hash_value (unused (void *key), void *list, void *context)
 {
-    const search_context_t *ctx = context;
+    search_context_t *ctx = context;
 
     if (ctx->dedup == DEDUP_ADDRESS) {
 	mailbox_t *mailbox = summarize_mailboxes (list);
-	print_mailbox (ctx, mailbox);
+	ctx->output_mailboxes = g_list_prepend (ctx->output_mailboxes, mailbox);
     } else
 	g_list_foreach (list, print_list_value, context);
 }
@@ -621,7 +628,10 @@ do_search_messages (search_context_t *ctx)
 
     if (ctx->addresses &&
 	(ctx->output & OUTPUT_COUNT || ctx->dedup == DEDUP_ADDRESS)) {
-	g_hash_table_foreach (ctx->addresses, print_hash_value, ctx);
+	g_hash_table_foreach (ctx->addresses, process_hash_value, ctx);
+	ctx->output_mailboxes = g_list_sort (ctx->output_mailboxes, compare_count);
+	if (ctx->dedup == DEDUP_ADDRESS)
+	    g_list_foreach (ctx->output_mailboxes, print_list_value, ctx);
     }
     notmuch_messages_destroy (messages);
 
@@ -910,6 +920,7 @@ notmuch_address_command (notmuch_database_t *notmuch, int argc, char *argv[])
     ctx->addresses = g_hash_table_new_full (strcase_hash, strcase_equal,
 					    _talloc_free_for_g_hash,
 					    _list_free_for_g_hash);
+    ctx->output_mailboxes = NULL; /* empty list, according to glib */
 
     /* The order is not guaranteed if a full pass is required, so go
      * for fastest. */
diff --git a/test/T095-address.sh b/test/T095-address.sh
index 8bb3627a..53886591 100755
--- a/test/T095-address.sh
+++ b/test/T095-address.sh
@@ -276,6 +276,26 @@ notmuch@notmuchmail.org
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
+test_begin_subtest "--deduplicate=address --output=sender --output=recipients --output=count (sort by frequency)"
+notmuch address --deduplicate=address --output=sender --output=recipients --output=count '*' | head -n 4 >OUTPUT
+cat <<EOF >EXPECTED
+50	notmuch@notmuchmail.org
+12	Carl Worth <cworth@cworth.org>
+8	Keith Packard <keithp@keithp.com>
+6	Alexander Botero-Lowry <alex.boterolowry@gmail.com>
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "--deduplicate=address --output=sender --output=recipients --output=count (sort by frequency)"
+notmuch address --deduplicate=address --output=sender --output=recipients '*' | head -n 4 >OUTPUT
+cat <<EOF >EXPECTED
+notmuch@notmuchmail.org
+Carl Worth <cworth@cworth.org>
+Keith Packard <keithp@keithp.com>
+Alexander Botero-Lowry <alex.boterolowry@gmail.com>
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 generate_message '[from]="Foo Bar <foo.bar@example.com>"'
 generate_message '[from]="Foo Bar <Foo.Bar@Example.Com>"'
 generate_message '[from]="Foo Bar <foo.bar@example.com>"'
@@ -325,6 +345,14 @@ cat <<EOF >EXPECTED
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
+test_begin_subtest "--deduplicate=address --output=sender --output=count (sort by frequency)"
+notmuch address --deduplicate=address --output=sender --output=count from:example.com >OUTPUT
+cat <<EOF >EXPECTED
+7	Foo Bar <foo.bar@example.com>
+3	Baz <foo.bar+baz@example.com>
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 if [[ NOTMUCH_HAVE_SFSEXP = 1 ]]; then
     test_begin_subtest "sexpr query: all messages"
     notmuch address '*' > EXPECTED
-- 
2.34.1

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