Proof of concept. Duktape engine linked in and echo command implemented.

init.lua

@@ -0,0 +1,9 @@
+require("scriptmine")
+
+minetest.register_chatcommand("js", {
+	params = "<command>",
+	description = "Run javascript command",
+	func = function(name, param)
+  javascript(name, param);
+	end,
+})

scriptmine.c

@@ -0,0 +1,44 @@
+#include <lua.h>
+#include <lauxlib.h>
+#include <lualib.h>
+#include "duktape.h"
+
+duk_context *ctx = NULL;
+lua_State *Lg = NULL;
+const char *name = NULL;
+
+duk_ret_t echo(duk_context *ctx)
+{
+ const char *text = duk_to_lstring(ctx, 0 /*index*/, NULL);
+ lua_getfield(Lg, LUA_GLOBALSINDEX, "minetest");
+ lua_getfield(Lg, -1, "chat_send_player");
+ lua_remove(Lg, -2);
+ lua_pushstring(Lg, name);
+ lua_pushstring(Lg, text);
+ lua_pushboolean(Lg, 0);
+ lua_call(Lg, 3, 1);
+ return 1;
+}
+
+static int javascript(lua_State *L)
+{
+	const char *cmd = lua_tostring(L, -1);
+	name = lua_tostring(L, -2);
+ Lg = L;
+ duk_eval_string(ctx, cmd);
+	return 1;
+}
+
+int luaopen_scriptmine(lua_State *L)
+{
+ ctx = duk_create_heap_default();
+ duk_push_global_object(ctx);
+ duk_push_c_function(ctx, echo, 1 /*nargs*/);
+ duk_put_prop_string(ctx, -2, "echo");
+ if (!ctx) {
+  printf("Failed to create a Duktape heap.\n");
+  exit(1);
+ }
+ lua_register(L, "javascript", javascript);
+	return 0;
+}