3 files changed, 53 insertions, 3 deletions
diff --git a/src/directives.c b/src/directives.c
index 5ff3b4d..829a736 100644
--- a/src/directives.c
+++ b/src/directives.c
@@ -10,13 +10,50 @@
 #include <config.h>
 #endif /* HAVE_CONFIG_H */
 
+#include <string.h>
+
 #include "utils/utils.h"
+#include "directives.h"
 #include "error.h"
 
+
+blogc_directive_t registry[] = {
+    {"youtube", blogc_directive_youtube},
+    {NULL, NULL},
+};
+
+
 char*
 blogc_directive_loader(const char *name, const char *argument, b_trie_t *params,
     blogc_error_t **err)
 {
-    // TODO: implement me!
-    return b_strdup("TODO\n");
+    for (unsigned int i = 0; registry[i].name != NULL; i++)
+        if (0 == strcmp(name, registry[i].name))
+            return registry[i].callback(argument, params, err);
+    return NULL;
+}
+
+
+char*
+blogc_directive_youtube(const char *argument, b_trie_t *params, blogc_error_t **err)
+{
+    if (err != NULL && *err != NULL)
+        return NULL;
+    if (argument == NULL) {
+        *err = blogc_error_new_printf(BLOGC_WARNING_CONTENT_PARSER,
+            "youtube: Invalid video ID: %s", argument);
+        return NULL;
+    }
+
+    char *width = b_trie_lookup(params, "width");
+    char *height = b_trie_lookup(params, "height");
+
+    // using default 16:9 sizes provided by youtube as of 2015-11-04
+    return b_strdup_printf(
+        "<iframe width=\"%s\" height=\"%s\" "
+        "src=\"https://www.youtube.com/embed/%s\" frameborder=\"0\" "
+        "allowfullscreen></iframe>\n",
+        width == NULL ? "560" : width,
+        height == NULL ? "315" : height,
+        argument);
 }
diff --git a/src/directives.h b/src/directives.h
index d03102a..cbfd213 100644
--- a/src/directives.h
+++ b/src/directives.h
@@ -12,7 +12,20 @@
 #include "utils/utils.h"
 #include "error.h"
 
+typedef char* (*blogc_directive_func_t)(const char *argument, b_trie_t *params,
+    blogc_error_t **err);
+
+typedef struct {
+    const char *name;
+    blogc_directive_func_t callback;
+} blogc_directive_t;
+
 char* blogc_directive_loader(const char *name, const char *argument,
     b_trie_t *params, blogc_error_t **err);
 
+
+// built-in directives (that are everything we support right now
+char* blogc_directive_youtube(const char *argument, b_trie_t *params,
+    blogc_error_t **err);
+
 #endif /* _DIRECTIVES_H */
diff --git a/src/utils/trie.c b/src/utils/trie.c
index 72a62f6..db64e1d 100644
--- a/src/utils/trie.c
+++ b/src/utils/trie.c
@@ -110,7 +110,7 @@ clean:
 void*
 b_trie_lookup(b_trie_t *trie, const char *key)
 {
-    if (trie->root == NULL || key == NULL)
+    if (trie == NULL || trie->root == NULL || key == NULL)
         return NULL;
 
     b_trie_node_t *parent = trie->root;