notmuch search: Avoid printing duplicate author names.

We add a hash to the thread object so that we can detect author names
that have already been added to the list, and avoid adding them
redundantly. This avoids the giant chain of "bugzilla-daemon,
bugzilla-daemon, bugzilla-daemon, bugzilla-daemon, ..." author lists
that we would get otherwise, for example.

lib/thread.cc

@@ -30,6 +30,7 @@ struct _notmuch_thread {
     notmuch_database_t *notmuch;
     char *thread_id;
     char *subject;
+    GHashTable *authors_hash;
     char *authors;
     GHashTable *tags;
 
@@ -41,11 +42,33 @@ struct _notmuch_thread {
 static int
 _notmuch_thread_destructor (notmuch_thread_t *thread)
 {
+    g_hash_table_unref (thread->authors_hash);
     g_hash_table_unref (thread->tags);
 
     return 0;
 }
 
+static void
+_thread_add_author (notmuch_thread_t *thread,
+		    const char *author)
+{
+    if (author == NULL)
+	return;
+
+    if (g_hash_table_lookup_extended (thread->authors_hash,
+				      author, NULL, NULL))
+	return;
+
+    g_hash_table_insert (thread->authors_hash, xstrdup (author), NULL);
+
+    if (thread->authors)
+	thread->authors = talloc_asprintf (thread, "%s, %s",
+					   thread->authors,
+					   author);
+    else
+	thread->authors = talloc_strdup (thread, author);
+}
+
 static void
 _thread_add_message (notmuch_thread_t *thread,
 		     notmuch_message_t *message)
@@ -68,14 +91,7 @@ _thread_add_message (notmuch_thread_t *thread,
 		mailbox = INTERNET_ADDRESS_MAILBOX (address);
 		author = internet_address_mailbox_get_addr (mailbox);
 	    }
-	    if (author) {
+	    _thread_add_author (thread, author);
-		if (thread->authors)
-		    thread->authors = talloc_asprintf (thread, "%s, %s",
-						       thread->authors,
-						       author);
-		else
-		    thread->authors = talloc_strdup (thread, author);
-	    }
 	}
 	g_object_unref (G_OBJECT (list));
     }
@@ -150,6 +166,8 @@ _notmuch_thread_create (const void *ctx,
     thread->notmuch = notmuch;
     thread->thread_id = talloc_strdup (thread, thread_id);
     thread->subject = NULL;
+    thread->authors_hash = g_hash_table_new_full (g_str_hash, g_str_equal,
+						  free, NULL);
     thread->authors = NULL;
     thread->tags = g_hash_table_new_full (g_str_hash, g_str_equal,
 					  free, NULL);