diff --git a/src/cli/_wren.inc b/src/cli/_wren.inc
index de8d0466..2f141225 100644
--- a/src/cli/_wren.inc
+++ b/src/cli/_wren.inc
@@ -120,6 +120,17 @@ static const char* resolverModuleSource =
 "  }\n"
 "}\n"
 "\n"
+"class File {\n"
+"  foreign static loadDynamicLibrary(name, path)\n"
+"  foreign static existsSync(s)\n"
+"  foreign static realPathSync(s)\n"
+"}\n"
+"\n"
+"Resolver.boot()\n"
+"\n"
+"\n"
+"\n\n"
+"//module=resolver,cli\n"
 "class PathType {\n"
 "  static SIMPLE { 1 }\n"
 "  static ABSOLUTE { 2 }\n"
@@ -138,18 +149,8 @@ static const char* resolverModuleSource =
 "    return PathType.SIMPLE\n"
 "  }\n"
 "}\n"
-"\n"
-"class File {\n"
-"  foreign static loadDynamicLibrary(name, path)\n"
-"  foreign static existsSync(s)\n"
-"  foreign static realPathSync(s)\n"
-"}\n"
-"\n"
-"Resolver.boot()\n"
-"\n"
-"\n"
 "\n\n"
-"#module=resolver\n"
+"//module=resolver,cli\n"
 "class Path {\n"
 "  construct new(path) { \n"
 "    _path = path \n"
@@ -228,15 +229,7 @@ static const char* resolverModuleSource =
 
 // Generated automatically from src/cli/*.wren. Do not edit.
 static const char* cliModuleSource =
-"import \"repl\" for Repl, AnsiRepl, SimpleRepl\n"
-"import \"os\" for Platform, Process\n"
-"import \"io\" for Stdin, Stderr, File, Stdout, Stat\n"
-"import \"mirror\" for Mirror\n"
-"import \"meta\" for Meta\n"
-"import \"runtime\" for Runtime\n"
-"\n"
-"// TODO: how to avoid duplication?\n"
-"// we only use this for absolute path\n"
+"//module=resolver,cli\n"
 "class PathType {\n"
 "  static SIMPLE { 1 }\n"
 "  static ABSOLUTE { 2 }\n"
@@ -255,6 +248,13 @@ static const char* cliModuleSource =
 "    return PathType.SIMPLE\n"
 "  }\n"
 "}\n"
+"\n\n"
+"import \"repl\" for Repl, AnsiRepl, SimpleRepl\n"
+"import \"os\" for Platform, Process\n"
+"import \"io\" for Stdin, Stderr, File, Stdout, Stat\n"
+"import \"mirror\" for Mirror\n"
+"import \"meta\" for Meta\n"
+"import \"runtime\" for Runtime\n"
 "\n"
 "class StackTrace {\n"
 "  construct new(fiber) {\n"
@@ -314,7 +314,7 @@ static const char* cliModuleSource =
 "    \n"
 "  }\n"
 "  static dirForModule(file) {\n"
-"    return file.split(\"/\")[0..-2].join(\"/\")\n"
+"    return Path.new(file).dirname.toString\n"
 "  }\n"
 "  static missingScript(file) {\n"
 "    Stderr.print(\"wrenc: No such file -- %(file)\")\n"
@@ -364,5 +364,83 @@ static const char* cliModuleSource =
 "  }\n"
 "  foreign static setRootDirectory_(dir) \n"
 "}\n"
-"CLI.start()\n";
+"// CLI.start()\n"
+"\n"
+"\n\n"
+"//module=resolver,cli\n"
+"class Path {\n"
+"  construct new(path) { \n"
+"    _path = path \n"
+"    _sep = appearsWindows() ? \"\\\\\" : \"/\"\n"
+"  }\n"
+"  appearsWindows() {\n"
+"    if (_path.contains(\"\\\\\")) return true\n"
+"    if (_path.count>=2 && _path[1] == \":\") return true\n"
+"  }\n"
+"  sep { _sep || \"/\" }\n"
+"  toString { _path }\n"
+"  up() { join(\"..\") }\n"
+"  join(path) { Path.new(_path + sep + path).normalize }\n"
+"  isRoot { \n"
+"    return _path == \"/\"  || \n"
+"      // C:\n"
+"      (_path.count == 2 && _path[1] == \":\") ||\n"
+"      // F:\\\n"
+"      (_path.count == 3 && _path[1..2] == \":\\\\\") \n"
+"  }\n"
+"  dirname {\n"
+"    if (_path==\"/\") return this\n"
+"    if (_path.endsWith(sep)) return Path.new(_path[0..-2])\n"
+"    return up()\n"
+"  }\n"
+"  static split(path) {\n"
+"    var segments = []\n"
+"    var last = 0\n"
+"    var i = 0\n"
+"    while (i < path.count) {\n"
+"      var char = path[i]\n"
+"      if (char == \"/\" || char == \"\\\\\") {\n"
+"        if (last==i) {\n"
+"          segments.add(\"\")\n"
+"        } else {\n"
+"          segments.add(path[last...i])\n"
+"        }\n"
+"        last = i + 1\n"
+"      }\n"
+"      i = i + 1\n"
+"    }\n"
+"    if (last<path.count) {\n"
+"      segments.add(path[last..-1])\n"
+"    } else if (last==i) {\n"
+"      segments.add(\"\")\n"
+"    }\n"
+"    return segments\n"
+"  }\n"
+"  normalize {\n"
+"    // var paths = _path.split(sep)\n"
+"    var paths = Path.split(_path)\n"
+"    var finalPaths = []\n"
+"    if (_path.startsWith(\"/\")) finalPaths.add(\"/\") \n"
+"    if (paths[0]==\".\") finalPaths.add(\".\") \n"
+"    for (path in paths) {\n"
+"      var last = finalPaths.count>0 ? finalPaths[-1] : null\n"
+"      if (path == \"..\") {\n"
+"        if (last == \"/\") continue\n"
+"        if (last == \"..\" || last == null) {\n"
+"          finalPaths.add(\"%(path)\")  \n"
+"        } else {\n"
+"          if (finalPaths.count > 0) finalPaths.removeAt(finalPaths.count - 1)\n"
+"        }\n"
+"      } else if (path == \"\" || path == \".\") {\n"
+"        continue\n"
+"      } else {\n"
+"        finalPaths.add(path)\n"
+"      }\n"
+"    }\n"
+"    if (finalPaths.count>1 && finalPaths[0] == \"/\") finalPaths[0] = \"\"\n"
+"    var path = finalPaths.join(sep)\n"
+"    if (path == \"\") path = \".\"\n"
+"    return Path.new(path)\n"
+"  }\n"
+"}";
 
diff --git a/src/cli/cli.wren b/src/cli/cli.wren
index 2fa6d6be..de80ed37 100644
--- a/src/cli/cli.wren
+++ b/src/cli/cli.wren
@@ -5,27 +5,6 @@ import "mirror" for Mirror
 import "meta" for Meta
 import "runtime" for Runtime
 
-// TODO: how to avoid duplication?
-// we only use this for absolute path
-class PathType {
-  static SIMPLE { 1 }
-  static ABSOLUTE { 2 }
-  static RELATIVE { 3 }
-
-  static unixAbsolute(path) { path.startsWith("/") }
-  static windowsAbsolute(path) {
-    // TODO: is this not escaped properly by the stock Python code generator
-    return path.count >= 3 && path[1..2] == ":\\"
-  }
-  static resolve(path) {
-    if (path.startsWith(".")) return PathType.RELATIVE
-    if (unixAbsolute(path)) return PathType.ABSOLUTE
-    if (windowsAbsolute(path)) return PathType.ABSOLUTE
-
-    return PathType.SIMPLE
-  }
-}
-
 class StackTrace {
   construct new(fiber) {
     _fiber = fiber
@@ -84,7 +63,7 @@ class CLI {
     
   }
   static dirForModule(file) {
-    return file.split("/")[0..-2].join("/")
+    return Path.new(file).dirname.toString
   }
   static missingScript(file) {
     Stderr.print("wrenc: No such file -- %(file)")
@@ -134,5 +113,5 @@ class CLI {
   }
   foreign static setRootDirectory_(dir) 
 }
-CLI.start()
+// CLI.start()
 
diff --git a/src/cli/path.wren b/src/cli/path.wren
index 0bbd5484..ad95558f 100644
--- a/src/cli/path.wren
+++ b/src/cli/path.wren
@@ -1,4 +1,4 @@
-#module=resolver
+//module=resolver,cli
 class Path {
   construct new(path) { 
     _path = path 
diff --git a/src/cli/path_type.wren b/src/cli/path_type.wren
new file mode 100644
index 00000000..17a0180b
--- /dev/null
+++ b/src/cli/path_type.wren
@@ -0,0 +1,19 @@
+//module=resolver,cli
+class PathType {
+  static SIMPLE { 1 }
+  static ABSOLUTE { 2 }
+  static RELATIVE { 3 }
+
+  static unixAbsolute(path) { path.startsWith("/") }
+  static windowsAbsolute(path) {
+    // TODO: is this not escaped properly by the stock Python code generator
+    return path.count >= 3 && path[1..2] == ":\\"
+  }
+  static resolve(path) {
+    if (path.startsWith(".")) return PathType.RELATIVE
+    if (unixAbsolute(path)) return PathType.ABSOLUTE
+    if (windowsAbsolute(path)) return PathType.ABSOLUTE
+
+    return PathType.SIMPLE
+  }
+}
diff --git a/src/cli/resolver.wren b/src/cli/resolver.wren
index ba2fa29e..b2275e49 100644
--- a/src/cli/resolver.wren
+++ b/src/cli/resolver.wren
@@ -118,25 +118,6 @@ class Resolver {
   }
 }
 
-class PathType {
-  static SIMPLE { 1 }
-  static ABSOLUTE { 2 }
-  static RELATIVE { 3 }
-
-  static unixAbsolute(path) { path.startsWith("/") }
-  static windowsAbsolute(path) {
-    // TODO: is this not escaped properly by the stock Python code generator
-    return path.count >= 3 && path[1..2] == ":\\"
-  }
-  static resolve(path) {
-    if (path.startsWith(".")) return PathType.RELATIVE
-    if (unixAbsolute(path)) return PathType.ABSOLUTE
-    if (windowsAbsolute(path)) return PathType.ABSOLUTE
-
-    return PathType.SIMPLE
-  }
-}
-
 class File {
   foreign static loadDynamicLibrary(name, path)
   foreign static existsSync(s)
diff --git a/src/cli/vm.c b/src/cli/vm.c
index 73ac5fb5..b41e1953 100644
--- a/src/cli/vm.c
+++ b/src/cli/vm.c
@@ -225,7 +225,8 @@ WrenInterpretResult runCLI()
   rootDirectory = (char*)".";
   initVM();
 
-  WrenInterpretResult result = wrenInterpret(vm, "<cli>", "import \"cli\"\n");
+  WrenInterpretResult result = wrenInterpret(vm, "<cli>", "import \"cli\" for CLI\n");
+  if (result == WREN_RESULT_SUCCESS) { result = wrenInterpret(vm, "<cli>", "CLI.start()"); }
   
   if (result == WREN_RESULT_SUCCESS)
   {
diff --git a/util/cli_to_c_string.py b/util/cli_to_c_string.py
index 4abcc7bb..5fb029d0 100755
--- a/util/cli_to_c_string.py
+++ b/util/cli_to_c_string.py
@@ -43,17 +43,18 @@ def process_file(path, modules):
     wren_source_lines = f.readlines() + ["\n\n"]
 
   first = wren_source_lines[0]
-  m = re.search(r'#module=(.*)',first)
+  m = re.search(r'//module=(.*)',first)
   if (m):
-    module = m.group(1)
+    moduleNames = m.group(1).split(",")
   else:
-    module = os.path.splitext(infile)[0]
-  module = module.replace("opt_", "")
-  module = module.replace("wren_", "")
+    moduleNames = [os.path.splitext(infile)[0]]
 
-  modules[module] = modules.get(module,[])
-  modules[module].extend(wren_source_lines)
-  # return wren_to_c_string(infile, wren_source_lines, module)
+  for module in moduleNames:
+    module = module.replace("opt_", "")
+    module = module.replace("wren_", "")
+    modules[module] = modules.get(module,[])
+    modules[module].extend(wren_source_lines)
+    # return wren_to_c_string(infile, wren_source_lines, module)
 
 
 module_files = {}