Implement parsing of IRC 3.2 message tags

It's still in the making and we don't use it, but let's not fail on it if e.g.
a plugin decides to enable it.

1 files changed, 43 insertions, 3 deletions

diff --git a/src/common.c b/src/common.c
index be523a9..ae5814f 100644
--- a/src/common.c
+++ b/src/common.c
@@ -1483,18 +1483,57 @@ xssl_get_error (SSL *ssl, int result, const char **error_info)
 
 struct irc_message
 {
-	char *prefix;
-	char *command;
-	struct str_vector params;
+	struct str_map tags;                ///< IRC 3.2 message tags
+	char *prefix;                       ///< Message prefix
+	char *command;                      ///< IRC command
+	struct str_vector params;           ///< Command parameters
 };
 
 static void
+irc_parse_message_tags (const char *tags, struct str_map *out)
+{
+	struct str_vector v;
+	str_vector_init (&v);
+	split_str_ignore_empty (tags, ';', &v);
+
+	for (size_t i = 0; i < v.len; i++)
+	{
+		char *key = v.vector[i], *equal_sign = strchr (key, '=');
+		if (equal_sign)
+		{
+			*equal_sign = '\0';
+			str_map_set (out, key, xstrdup (equal_sign + 1));
+		}
+		else
+			str_map_set (out, key, xstrdup (""));
+	}
+
+	str_vector_free (&v);
+}
+
+static void
 irc_parse_message (struct irc_message *msg, const char *line)
 {
+	str_map_init (&msg->tags);
+	msg->tags.free = free;
+
 	msg->prefix = NULL;
 	msg->command = NULL;
 	str_vector_init (&msg->params);
 
+	// IRC 3.2 message tags
+	if (*line == '@')
+	{
+		size_t tags_len = strcspn (++line, " ");
+		char *tags = xstrndup (line, tags_len);
+		irc_parse_message_tags (tags, &msg->tags);
+		free (tags);
+
+		line += tags_len;
+		while (*line == ' ')
+			line++;
+	}
+
 	// Prefix
 	if (*line == ':')
 	{
@@ -1537,6 +1576,7 @@ irc_parse_message (struct irc_message *msg, const char *line)
 static void
 irc_free_message (struct irc_message *msg)
 {
+	str_map_free (&msg->tags);
 	free (msg->prefix);
 	free (msg->command);
 	str_vector_free (&msg->params);