diff --git a/main.go b/main.go
new file mode 100644
index 0000000..df48b4e
--- /dev/null
+++ b/main.go
@@ -0,0 +1,281 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"runtime/pprof"
+	"strings"
+
+	"gopkg.in/yaml.v2"
+	"git.wow.st/gmp/nswrap/ast"
+	"git.wow.st/gmp/nswrap/wrap"
+)
+
+var Debug = false
+var Profile = false
+
+type conf struct {
+	Positions bool
+	Package string
+	Inputfiles []string
+	Classes []string
+	Functions []string
+	Enums []string
+	Delegates map[string]map[string][]string
+	Subclasses map[string]map[string][]string
+	Frameworks []string
+	Imports []string
+	Sysimports []string
+	Pragma []string
+	Vaargs int
+}
+
+var Config conf
+
+func readAST(data []byte) []string {
+	return strings.Split(string(data), "\n")
+}
+
+type treeNode struct {
+	indent int
+	node   ast.Node
+}
+
+func convertLinesToNodes(lines []string) []treeNode {
+	nodes := make([]treeNode, len(lines))
+	var counter int
+	for _, line := range lines {
+		if strings.TrimSpace(line) == "" {
+			continue
+		}
+
+		// It is tempting to discard null AST nodes, but these may
+		// have semantic importance: for example, they represent omitted
+		// for-loop conditions, as in for(;;).
+		line = strings.Replace(line, "<<<NULL>>>", "NullStmt", 1)
+		trimmed := strings.TrimLeft(line, "|\\- `")
+		node := ast.Parse(trimmed)
+		indentLevel := (len(line) - len(trimmed)) / 2
+		nodes[counter] = treeNode{indentLevel, node}
+		counter++
+	}
+	nodes = nodes[0:counter]
+
+	return nodes
+}
+
+func convertLinesToNodesParallel(lines []string) []treeNode {
+	// function f separate full list on 2 parts and
+	// then each part can recursive run function f
+	var f func([]string, int) []treeNode
+
+	f = func(lines []string, deep int) []treeNode {
+		deep = deep - 2
+		part := len(lines) / 2
+
+		var tr1 = make(chan []treeNode)
+		var tr2 = make(chan []treeNode)
+
+		go func(lines []string, deep int) {
+			if deep <= 0 || len(lines) < deep {
+				tr1 <- convertLinesToNodes(lines)
+				return
+			}
+			tr1 <- f(lines, deep)
+		}(lines[0:part], deep)
+
+		go func(lines []string, deep int) {
+			if deep <= 0 || len(lines) < deep {
+				tr2 <- convertLinesToNodes(lines)
+				return
+			}
+			tr2 <- f(lines, deep)
+		}(lines[part:], deep)
+
+		defer close(tr1)
+		defer close(tr2)
+
+		return append(<-tr1, <-tr2...)
+	}
+
+	// Parameter of deep - can be any, but effective to use
+	// same amount of CPU
+	return f(lines, runtime.NumCPU())
+}
+
+// buildTree converts an array of nodes, each prefixed with a depth into a tree.
+func buildTree(nodes []treeNode, depth int) []ast.Node {
+	if len(nodes) == 0 {
+		return []ast.Node{}
+	}
+
+	// Split the list into sections, treat each section as a tree with its own
+	// root.
+	sections := [][]treeNode{}
+	for _, node := range nodes {
+		if node.indent == depth {
+			sections = append(sections, []treeNode{node})
+		} else {
+			sections[len(sections)-1] = append(sections[len(sections)-1], node)
+		}
+	}
+
+	results := []ast.Node{}
+	for _, section := range sections {
+		slice := []treeNode{}
+		for _, n := range section {
+			if n.indent > depth {
+				slice = append(slice, n)
+			}
+		}
+
+		children := buildTree(slice, depth+1)
+		for _, child := range children {
+			section[0].node.AddChild(child)
+		}
+		results = append(results, section[0].node)
+	}
+
+	return results
+}
+
+func matches(x string, rs []string) bool {
+	for _,r := range rs {
+		if m, _ := regexp.MatchString("^" + r + "$",x); m {
+			return true
+		}
+	}
+	return false
+}
+
+// Start begins transpiling an input file.
+func Start() (err error) {
+	for _, in := range Config.Inputfiles {
+		_, err := os.Stat(in)
+		if err != nil {
+			return fmt.Errorf("Input file %s is not found", in)
+		}
+	}
+
+	// Generate AST
+	cargs := []string{"-xobjective-c", "-Xclang", "-ast-dump",
+			"-fsyntax-only","-fno-color-diagnostics"}
+	cargs = append(cargs,Config.Inputfiles...)
+	fmt.Printf("Generating AST\n")
+	astPP, err := exec.Command("clang",cargs...).Output()
+	if err != nil {
+		// If clang fails it still prints out the AST, so we have to run it
+		// again to get the real error.
+		//errBody, _ := exec.Command("clang", cargs...).CombinedOutput()
+		var txt string
+		switch x := err.(type) {
+		case *exec.ExitError:
+			txt = string(x.Stderr)
+		default:
+			txt = err.Error()
+		}
+		fmt.Printf("clang failed:\n%s\n", txt)
+		os.Exit(-1)
+	}
+
+	lines := readAST(astPP)
+
+	// Converting to nodes
+	fmt.Printf("Building nodes\n")
+	if Config.Positions {
+		ast.TrackPositions = true
+	}
+	//NOTE: converting in parallel is slower on my system
+	//nodes := convertLinesToNodesParallel(lines)
+	nodes := convertLinesToNodes(lines)
+
+	// build tree
+	fmt.Printf("Assembling tree\n")
+	tree := buildTree(nodes, 0)
+	w := wrap.NewWrapper(Debug)
+	w.Package = Config.Package
+	w.Frameworks(Config.Frameworks)
+	w.Import(Config.Imports)
+	w.SysImport(Config.Sysimports)
+	w.Pragma(Config.Pragma)
+	w.Delegate(Config.Delegates)
+	w.Subclass(Config.Subclasses)
+	if Config.Vaargs == 0 {
+		Config.Vaargs = 16
+	}
+	w.Vaargs = Config.Vaargs
+	for _, u := range tree {
+		fmt.Printf("--processing translation unit\n")
+		for _, n := range(u.Children()) {
+			switch x := n.(type) {
+			case *ast.ObjCInterfaceDecl:
+				w.AddInterface(x)
+				for _,ss := range Config.Subclasses {
+					if sc,ok := ss["superclass"]; ok {
+						if matches(x.Name,sc) {
+							Config.Classes = append(Config.Classes,x.Name)
+						}
+					}
+				}
+			case *ast.ObjCCategoryDecl:
+				w.AddCategory(x)
+			case *ast.TypedefDecl:
+				w.AddTypedef(x.Name,x.Type)
+			case *ast.FunctionDecl:
+				if matches(x.Name,Config.Functions) {
+					w.AddFunction(x)
+				}
+			case *ast.ObjCProtocolDecl:
+				w.AddProtocol(x)
+			case *ast.EnumDecl:
+				w.AddEnum(x,Config.Enums)
+			}
+		}
+	}
+	w.Wrap(Config.Classes)
+	return nil
+}
+
+func main() {
+	if Profile {
+		f1, err := os.Create("cpuprofile.pprof")
+		if err != nil {
+			log.Fatal("could not create CPU profile: ", err)
+		}
+		defer f1.Close()
+		if err := pprof.StartCPUProfile(f1); err != nil {
+			log.Fatal("could not start CPU profile: ", err)
+		}
+		defer pprof.StopCPUProfile()
+	}
+
+	confbytes, err := ioutil.ReadFile("nswrap.yaml")
+	if err != nil {
+		fmt.Printf("Cannot open config file nswrap.yaml. %s\n",err)
+		os.Exit(-1)
+	}
+	if err = yaml.Unmarshal(confbytes,&Config); err != nil {
+		fmt.Printf("Cannot decode config file nswrap.yaml. %s\n",err)
+		os.Exit(-1)
+	}
+	if err := Start(); err != nil {
+		fmt.Printf("Error: %v\n", err)
+		os.Exit(-1)
+	}
+	if Profile {
+		f2, err := os.Create("memprofile.pprof")
+		if err != nil {
+			log.Fatal("could not create memory profile: ", err)
+		}
+		defer f2.Close()
+		runtime.GC() // get up-to-date statistics
+		if err := pprof.WriteHeapProfile(f2); err != nil {
+			log.Fatal("could not write memory profile: ", err)
+		}
+	}
+}