lua.lua works as a standalone interpreter

luainlua-0.1-0.rockspec

@@ -20,6 +20,9 @@ dependencies = {
 }
 build = {
    type = "builtin",
+   install = {
+     bin = {"luainlua/lua.lua"},
+   },
    modules = {
      ['luainlua.bytecode.dump'] = 'luainlua/bytecode/dump.lua',
      ['luainlua.bytecode.ir'] = 'luainlua/bytecode/ir.lua',

luainlua/bytecode/undump.lua

@@ -38,10 +38,10 @@ local function constant(ctx)
 end
 
 function undump.load_header(ctx)
-  assert(ctx:int() == 0x61754c1b) -- ESC. Lua
-  assert(ctx:byte() == 0x52) -- version
-  assert(ctx:byte() == 0) -- format version
-  assert(ctx:byte() == 1) -- little endian
+  assert(ctx:int() == 0x61754c1b, "Make sure you're running vanilla Lua 5.2") -- ESC. Lua
+  assert(ctx:byte() == 0x52, "Make sure you're running vanilla Lua 5.2") -- version
+  assert(ctx:byte() == 0, "Not expecting extensions.") -- format version
+  assert(ctx:byte() == 1, "Not expecting big-endianess.") -- little endian
   if not undump.sizeof_int then
     undump.sizeof_int = assert(ctx:byte()) -- sizeof(int)
     undump.sizeof_sizet = assert(ctx:byte()) -- sizeof(size_t)

luainlua/lua.lua

@@ -3,11 +3,17 @@ local argparse = require 'argparse'
 
 function main(arg)
     local parser = argparse("script", "An example.")
-    parser:argument("input", "Input file.")
+    parser:argument("input", "Input file.", "--")
     parser:option("-d --dump"):args "?"
-
     local args = parser:parse()
-    local func, bytecode, prototype, dumper = luac.compile(io.open(args.input, 'r'):read('*all'))
+    local code
+    if (args.input == '--') then
+        code = io.read("*all")
+    else
+        code = io.open(args.input, 'r'):read('*all')
+    end
+    local args = parser:parse()
+    local func, bytecode, prototype, dumper = luac.compile(code)
     if args.dump then
         dumper(prototype)
         print("--- END OF DUMP ---")