add some useful func

+package utils
+
+import (
+	"reflect"
+	"runtime"
+)
+
+func GetFuncName(i interface{}) string {
+	return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
+}

+package utils
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestGetFuncName(t *testing.T) {
+	name := GetFuncName(TestGetFuncName)
+	t.Log(name)
+	if !strings.HasSuffix(name, ".TestGetFuncName") {
+		t.Error("get func name error")
+	}
+}

@@ -43,7 +43,7 @@ func LookFile(filename string, paths ...string) (fullpath string, err error) {
 // like command grep -E
 // for example: GrepE(`^hello`, "hello.txt")
 // \n is striped while read
-func GrepE(patten string, filename string) (lines []string, err error) {
+func GrepFile(patten string, filename string) (lines []string, err error) {
 	re, err := regexp.Compile(patten)
 	if err != nil {
 		return

@@ -22,7 +22,7 @@ func TestSelfDir(t *testing.T) {
 }
 
 func TestFileExists(t *testing.T) {
-	if !FileExists("/bin/echo") {
+	if !FileExists("./file.go") {
 		t.Errorf("/bin/echo should exists, but it didn't")
 	}
 
@@ -44,14 +44,14 @@ func TestLookFile(t *testing.T) {
 	}
 }
 
-func TestGrepE(t *testing.T) {
-	_, err := GrepE("", noExistedFile)
+func TestGrepFile(t *testing.T) {
+	_, err := GrepFile("", noExistedFile)
 	if err == nil {
 		t.Error("expect file-not-existed error, but got nothing")
 	}
 
 	path := filepath.Join(".", "testdata", "grepe.test")
-	lines, err := GrepE(`^\s*[^#]+`, path)
+	lines, err := GrepFile(`^\s*[^#]+`, path)
 	if err != nil {
 		t.Error(err)
 	}