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diff --git a/compiler/nimfix.nim b/compiler/nimfix.nim
new file mode 100644
index 000000000..15174fd48
--- /dev/null
+++ b/compiler/nimfix.nim
@@ -0,0 +1,105 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2014 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Nimfix is a tool that helps to convert old-style Nimrod code to Nim code.
+
+import strutils, os, parseopt
+import options, commands, modules, sem, passes, passaux, pretty, msgs, nimconf,
+  extccomp, condsyms, lists
+
+const Usage = """
+Nimfix - Tool to patch Nim code
+Usage:
+  nimfix [options] projectflie.nim
+
+Options:
+  --overwriteFiles:on|off          overwrite the original nim files.
+                                   DEFAULT is ON!
+  --onlyMainfile                   overwrite only the main file.
+  --checkExtern:on|off             style check also extern names
+  --styleCheck:on|off|auto         performs style checking for identifiers
+                                   and suggests an alternative spelling; 
+                                   'auto' corrects the spelling.
+
+In addition, all command line options of Nim are supported.
+"""
+
+proc mainCommand =
+  #msgs.gErrorMax = high(int)  # do not stop after first error
+  registerPass verbosePass
+  registerPass semPass
+  gCmd = cmdPretty
+  appendStr(searchPaths, options.libpath)
+  if gProjectFull.len != 0:
+    # current path is always looked first for modules
+    prependStr(searchPaths, gProjectPath)
+
+  compileProject()
+  pretty.overwriteFiles()
+
+proc processCmdLine*(pass: TCmdLinePass, cmd: string) =
+  var p = parseopt.initOptParser(cmd)
+  var argsCount = 0
+  while true: 
+    parseopt.next(p)
+    case p.kind
+    of cmdEnd: break 
+    of cmdLongoption, cmdShortOption: 
+      case p.key.normalize
+      of "overwritefiles":
+        case p.val.normalize
+        of "on": gOverWrite = true
+        of "off": gOverWrite = false
+        else: localError(gCmdLineInfo, errOnOrOffExpected)
+      of "checkextern":
+        case p.val.normalize
+        of "on": gCheckExtern = true
+        of "off": gCheckExtern = false
+        else: localError(gCmdLineInfo, errOnOrOffExpected)
+      of "stylecheck": 
+        case p.val.normalize
+        of "off": gStyleCheck = StyleCheck.None
+        of "on": gStyleCheck = StyleCheck.Warn
+        of "auto": gStyleCheck = StyleCheck.Auto
+        else: localError(gCmdLineInfo, errOnOrOffExpected)
+      of "onlymainfile": gOnlyMainfile = true
+      else:
+        processSwitch(pass, p)
+    of cmdArgument:
+      options.gProjectName = unixToNativePath(p.key)
+      # if processArgument(pass, p, argsCount): break
+
+proc handleCmdLine() =
+  if paramCount() == 0:
+    stdout.writeln(Usage)
+  else:
+    processCmdLine(passCmd1, "")
+    if gProjectName != "":
+      try:
+        gProjectFull = canonicalizePath(gProjectName)
+      except OSError:
+        gProjectFull = gProjectName
+      var p = splitFile(gProjectFull)
+      gProjectPath = p.dir
+      gProjectName = p.name
+    else:
+      gProjectPath = getCurrentDir()
+    loadConfigs(DefaultConfig) # load all config files
+    # now process command line arguments again, because some options in the
+    # command line can overwite the config file's settings
+    extccomp.initVars()
+    processCmdLine(passCmd2, "")
+    mainCommand()
+
+when compileOption("gc", "v2") or compileOption("gc", "refc"):
+  GC_disableMarkAndSweep()
+
+condsyms.initDefines()
+defineSymbol "nimfix"
+handleCmdline()