add compare_not/not_nil methods for template

@@ -42,6 +42,9 @@ func init() {
 	beegoTplFuncMap["dateformat"] = DateFormat
 	beegoTplFuncMap["dateformat"] = DateFormat
 	beegoTplFuncMap["date"] = Date
 	beegoTplFuncMap["date"] = Date
 	beegoTplFuncMap["compare"] = Compare
 	beegoTplFuncMap["compare"] = Compare
+	beegoTplFuncMap["compare_not"] = CompareNot
+	beegoTplFuncMap["not_nil"] = NotNil
+	beegoTplFuncMap["not_null"] = NotNil
 	beegoTplFuncMap["substr"] = Substr
 	beegoTplFuncMap["substr"] = Substr
 	beegoTplFuncMap["html2str"] = Html2str
 	beegoTplFuncMap["html2str"] = Html2str
 	beegoTplFuncMap["str2html"] = Str2html
 	beegoTplFuncMap["str2html"] = Str2html

@@ -139,6 +139,14 @@ func Compare(a, b interface{}) (equal bool) {
 	return
 	return
 }
 }
 
 
+func CompareNot(a, b interface{}) (equal bool) {
+    return ! Compare(a, b)
+}
+
+func NotNil(a interface{}) (is_nil bool) {
+    return CompareNot(a, nil)
+}
+
 func Config(returnType, key string, defaultVal interface{}) (value interface{}, err error) {
 func Config(returnType, key string, defaultVal interface{}) (value interface{}, err error) {
 	switch returnType {
 	switch returnType {
 	case "String":
 	case "String":

@@ -72,7 +72,7 @@ func TestDate(t *testing.T) {
 	}
 	}
 }
 }
 
 
-func TestCompare(t *testing.T) {
+func TestCompareRelated(t *testing.T) {
 	if !Compare("abc", "abc") {
 	if !Compare("abc", "abc") {
 		t.Error("should be equal")
 		t.Error("should be equal")
 	}
 	}
@@ -82,6 +82,15 @@ func TestCompare(t *testing.T) {
 	if !Compare("1", 1) {
 	if !Compare("1", 1) {
 		t.Error("should be equal")
 		t.Error("should be equal")
 	}
 	}
+    if CompareNot("abc", "abc") {
+        t.Error("should be equal")
+    }
+    if !CompareNot("abc", "aBc") {
+        t.Error("should be not equal")
+    }
+    if !NotNil("a string") {
+        t.Error("should not be nil")
+    }
 }
 }
 
 
 func TestHtmlquote(t *testing.T) {
 func TestHtmlquote(t *testing.T) {