loadstring, loadfile, and dofile moonscript functions

Makefile

@@ -1,4 +1,7 @@
 
+compile:
+	moonc moon/ moonscript/
+
 local:
 	luarocks make --local moonscript-dev-1.rockspec
 

bin/moon

@@ -36,7 +36,7 @@ if not script_fname then
 end
 
 local file, err = io.open(script_fname)
-if not file then error(err) end
+if not file then error(err, 2) end
 
 local new_arg = {
 	[-1] = arg[0],

moonscript/init.lua

@@ -4,6 +4,10 @@ require("moonscript.parse")
 require("moonscript.util")
 local concat, insert = table.concat, table.insert
 local split, dump = util.split, util.dump
+local lua = {
+  loadstring = loadstring,
+  load = load
+}
 dirsep = "/"
 line_tables = { }
 local create_moonpath
@@ -17,20 +21,22 @@ create_moonpath = function(package_path)
   end
   return concat(paths, ";")
 end
-moon_chunk = function(file, file_path)
-  local text = file:read("*a")
-  if not text then
-    error("Could not read file")
-  end
+to_lua = function(text)
   local tree, err = parse.string(text)
   if not tree then
-    error("Parse error: " .. err)
+    error("Parse error: " .. err, 2)
   end
   local code, ltable, pos = compile.tree(tree)
   if not code then
-    error(compile.format_error(ltable, pos, text))
+    error(compile.format_error(ltable, pos, text), 2)
+  end
+  return code, ltable
+end
+moon_chunk = function(text, source_path)
+  local code, ltable = to_lua(text)
+  if source_path then
+    line_tables[source_path] = ltable
   end
-  line_tables[file_path] = ltable
   local runner
   runner = function()
     do
@@ -39,23 +45,25 @@ moon_chunk = function(file, file_path)
       return _with_0
     end
   end
-  return load(runner, file_path)
+  return lua.load(runner, source_path)
 end
 moon_loader = function(name)
   local name_path = name:gsub("%.", dirsep)
   local file, file_path = nil, nil
-  do
-    local _item_0 = split(package.moonpath, ";")
-    for _index_0 = 1, #_item_0 do
-      local path = _item_0[_index_0]
+  local _list_0 = split(package.moonpath, ";")
+  for _index_0 = 1, #_list_0 do
+    local path = _list_0[_index_0]
     file_path = path:gsub("?", name_path)
     file = io.open(file_path)
     if file then
       break
     end
   end
-  end
   if file then
+    local text = file:read("*a")
+    if not text then
+      error("Could not read file", 2)
+    end
     return moon_chunk(file, file_path)
   else
     return nil, "Could not find moon file"
@@ -71,3 +79,18 @@ end
 if not _G.moon_no_loader then
   init_loader()
 end
+loadstring = function(str)
+  local code = to_lua(str)
+  return lua.loadstring(code)
+end
+loadfile = function(fname)
+  local file, err = io.open(fname)
+  if not file then
+    return nil, err
+  end
+  return loadstring(file:read("*a"))
+end
+dofile = function(fname)
+  local f = assert(loadfile(fname))
+  return f()
+end