Add support for nostr: bech32 urls in posts and DMs (NIP19)

Changelog-Added: Add support for nostr: bech32 urls in posts and DMs (NIP19)

damus-c/damus.h

@@ -9,15 +9,27 @@
 #define damus_h
 
 #include <stdio.h>
+typedef unsigned char u8;
 
 #define MAX_BLOCKS 1024
+#define MAX_RELAYS 10
 
 enum block_type {
     BLOCK_HASHTAG = 1,
     BLOCK_TEXT = 2,
-    BLOCK_MENTION = 3,
-    BLOCK_URL = 4,
-    BLOCK_INVOICE = 5,
+    BLOCK_MENTION_INDEX = 3,
+    BLOCK_MENTION_BECH32 = 4,
+    BLOCK_URL = 5,
+    BLOCK_INVOICE = 6,
+};
+
+enum nostr_bech32_type {
+    NOSTR_BECH32_NOTE = 1,
+    NOSTR_BECH32_NPUB = 2,
+    NOSTR_BECH32_NPROFILE = 3,
+    NOSTR_BECH32_NEVENT = 4,
+    NOSTR_BECH32_NRELAY = 5,
+    NOSTR_BECH32_NADDR = 6,
 };
 
 typedef struct str_block {
@@ -32,12 +44,27 @@ typedef struct invoice_block {
     };
 } invoice_block_t;
 
+typedef struct mention_bech32_block {
+    struct str_block str;
+    enum nostr_bech32_type type;
+
+    u8 *event_id;
+    u8 *pubkey;
+    char *identifier;
+    char *relays[MAX_RELAYS];
+    int relays_count;
+    int kind;
+
+    u8* buffer;
+} mention_bech32_block_t;
+
 typedef struct block {
     enum block_type type;
     union {
         struct str_block str;
         struct invoice_block invoice;
-        int mention;
+        struct mention_bech32_block mention_bech32;
+        int mention_index;
     } block;
 } block_t;