Add opcodes support

src/on-chain/opcode.rs

@@ -0,0 +1,52 @@
+use bitcoin::Opcode;
+
+pub fn opcode_to_str(opcode: Opcode) -> &'static str {
+    match opcode {
+        Opcode::OP_0 => "OP_0",
+        Opcode::OP_1 => "OP_1",
+        Opcode::OP_2 => "OP_2",
+        Opcode::OP_3 => "OP_3",
+        Opcode::OP_4 => "OP_4",
+        Opcode::OP_5 => "OP_5",
+        Opcode::OP_6 => "OP_6",
+        Opcode::OP_7 => "OP_7",
+        Opcode::OP_8 => "OP_8",
+        Opcode::OP_9 => "OP_9",
+        Opcode::OP_10 => "OP_10",
+        Opcode::OP_11 => "OP_11",
+        Opcode::OP_12 => "OP_12",
+        Opcode::OP_13 => "OP_13",
+        Opcode::OP_14 => "OP_14",
+        Opcode::OP_15 => "OP_15",
+        Opcode::OP_16 => "OP_16",
+        Opcode::OP_NOP => "OP_NOP",
+        Opcode::OP_IF => "OP_IF",
+    }
+}
+
+pub fn opcode_to_str_with_arg(opcode: Opcode, arg: u8) -> String {
+    match opcode {
+        Opcode::OP_0 => "OP_0",
+        Opcode::OP_1 => "OP_1",
+        Opcode::OP_2 => "OP_2",
+        Opcode::OP_3 => "OP_3",
+        Opcode::OP_4 => "OP_4",
+        Opcode::OP_5 => "OP_5",
+        Opcode::OP_6 => "OP_6",
+        Opcode::OP_7 => "OP_7",
+        Opcode::OP_8 => "OP_8",
+        Opcode::OP_9 => "OP_9",
+        Opcode::OP_10 => "OP_10",
+        Opcode::OP_11 => "OP_11",
+        Opcode::OP_12 => "OP_12",
+        Opcode::OP_13 => "OP_13",
+        Opcode::OP_14 => "OP_14",
+        Opcode::OP_15 => "OP_15",
+        Opcode::OP_16 => "OP_16",
+        Opcode::OP_NOP => "OP_NOP",
+        Opcode::OP_IF => format!("OP_IF {}", arg),
+        Opcode::OP_NOTIF => format!("OP_NOTIF {}", arg),
+        Opcode::OP_ELSE => "OP_ELSE",
+    }
+    .to_string()
+}