introduce a /join command for guild text channels

libdc/include/dc/guild.h

@@ -16,6 +16,7 @@ dc_guild_t dc_guild_from_json(json_t *j);
 
 size_t dc_guild_channels(dc_guild_t d);
 dc_channel_t dc_guild_nth_channel(dc_guild_t d, size_t idx);
+dc_channel_t dc_guild_channel_by_name(dc_guild_t g, char const *name);
 
 char const *dc_guild_name(dc_guild_t d);
 void dc_guild_set_name(dc_guild_t d, char const *val);

libdc/include/dc/session.h

@@ -98,6 +98,7 @@ dc_channel_t dc_session_channel_recipients(dc_session_t s,
  */
 void dc_session_add_guild(dc_session_t s, dc_guild_t g);
 GHashTable *dc_session_guilds(dc_session_t s);
+dc_guild_t dc_session_guild_by_name(dc_session_t s, char const *name);
 
 /**
  * comparision functions for sorting, and finding

libdc/src/guild.c

@@ -58,7 +58,7 @@ dc_guild_t dc_guild_from_json(json_t *j)
     g->id = strdup(json_string_value(val));
 
     /* there is a ton of more information here, that we should look
-     * add, including "member_count", "owner_id", but for channels
+     * to add, including "member_count", "owner_id", but for now "channels"
      * will do nicely
      */
     val = json_object_get(j, "channels");
@@ -91,6 +91,21 @@ dc_channel_t dc_guild_nth_channel(dc_guild_t d, size_t idx)
     return g_ptr_array_index(d->channels, idx);
 }
 
+dc_channel_t dc_guild_channel_by_name(dc_guild_t g, char const *name)
+{
+    return_if_true(g == NULL || name == NULL, NULL);
+    size_t i = 0;
+
+    for (i = 0; i < g->channels->len; i++) {
+        dc_channel_t c = g_ptr_array_index(g->channels, i);
+        if (strcmp(dc_channel_name(c), name) == 0) {
+            return c;
+        }
+    }
+
+    return NULL;
+}
+
 char const *dc_guild_name(dc_guild_t d)
 {
     return_if_true(d == NULL, NULL);

libdc/src/session.c

@@ -450,3 +450,21 @@ void dc_session_add_guild(dc_session_t s, dc_guild_t g)
          */
     }
 }
+
+dc_guild_t dc_session_guild_by_name(dc_session_t s, char const *name)
+{
+    return_if_true(s == NULL || s->guilds == NULL || name == NULL, NULL);
+
+    GHashTableIter iter;
+    gpointer key, value;
+
+    g_hash_table_iter_init(&iter, s->guilds);
+    while (g_hash_table_iter_next(&iter, &key, &value)) {
+        dc_guild_t g = (dc_guild_t)value;
+        if (strcmp(dc_guild_name(g), name) == 0) {
+            return g;
+        }
+    }
+
+    return NULL;
+}