Added build script

build.go

@@ -0,0 +1,50 @@
+// +build ignore
+
+package main
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func main() {
+	env := os.Environ()
+	wd, err := os.Getwd()
+	if err != nil {
+		panic(err)
+	}
+	env = append(env, "GOPATH="+wd)
+
+	args := []string{"build"}
+
+	if len(os.Args) == 2 {
+		target := os.Args[1]
+		targetParts := strings.Split(target, "/")
+		if len(targetParts) != 2 {
+			println("Invalid target specification. Example: windows/386")
+			os.Exit(1)
+		}
+		env = append(env,
+			"GOOS="+targetParts[0],
+			"GOARCH"+targetParts[1],
+		)
+		ext := ""
+		if targetParts[0] == "windows" {
+			ext = ".exe"
+		}
+		args = append(args, "-o", "calanonsync-"+targetParts[0]+"-"+targetParts[1]+ext)
+	}
+
+	args = append(args, "calanonsync")
+
+	cmd := exec.Command("go", args...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Env = env
+
+	err = cmd.Run()
+	if err != nil {
+		panic(err)
+	}
+}