add ifGt helper

Author: Takumi2008

helper.go

@@ -32,6 +32,7 @@ func init() {
 	RegisterHelper("log", logHelper)
 	RegisterHelper("lookup", lookupHelper)
 	RegisterHelper("equal", equalHelper)
+	RegisterHelper("ifGt", ifGtHelper)
 }
 
 // RegisterHelper registers a global helper. That helper will be available to all templates.
@@ -302,6 +303,23 @@ func ifHelper(conditional interface{}, options *Options) interface{} {
 	return options.Inverse()
 }
 
+func ifGtHelper(a, b interface{}, options *Options) interface{} {
+	// Non-integer comparisons are not supported by the ifGt helper. Return empty string.
+	var aInt, bInt int
+	var ok bool
+	if aInt, ok = a.(int); !ok {
+		return ""
+	}
+	if bInt, ok = b.(int); !ok {
+		return ""
+	}
+	if aInt > bInt {
+		return options.Fn()
+	}
+	// Evaluate possible else condition.
+	return options.Inverse()
+}
+
 // #unless block helper
 func unlessHelper(conditional interface{}, options *Options) interface{} {
 	if options.isIncludableZero() || IsTrue(conditional) {

helper_test.go

@@ -194,6 +194,48 @@ var helperTests = []Test{
 		nil, nil, nil,
 		``,
 	},
+	{
+		"#ifGt helper with true literal",
+		`{{#ifGt foo 10}}foo is greater than 10{{/ifGt}}`,
+		map[string]interface{}{"foo": 11},
+		nil, nil, nil,
+		`foo is greater than 10`,
+	},
+	{
+		"#ifGt helper with false literal",
+		`{{#ifGt foo 10}}foo is greater than 10{{/ifGt}}`,
+		map[string]interface{}{"foo": 5},
+		nil, nil, nil,
+		``,
+	},
+	{
+		"#ifGt helper with true literal from params",
+		`{{#ifGt foo bar}}foo is greater than 10{{/ifGt}}`,
+		map[string]interface{}{"foo": 5, "bar": 0},
+		nil, nil, nil,
+		`foo is greater than 10`,
+	},
+	{
+		"#ifGt helper with string comparison, is improper imput should return empty string",
+		`{{#ifGt foo bar}}foo is greater than 10{{/ifGt}}`,
+		map[string]interface{}{"foo": "5", "bar": "0"},
+		nil, nil, nil,
+		``,
+	},
+	{
+		"#ifGt helper with false literal from params",
+		`{{#ifGt foo bar}}foo is greater than bar{{/ifGt}}`,
+		map[string]interface{}{"foo": 5, "bar": 0},
+		nil, nil, nil,
+		`foo is greater than bar`,
+	},
+	{
+		"#ifGt helper with else condition",
+		`{{#ifGt foo bar}}foo is greater than bar{{else}}foo is not greater than bar{{/ifGt}}`,
+		map[string]interface{}{"foo": 0, "bar": 5},
+		nil, nil, nil,
+		`foo is not greater than bar`,
+	},
 	{
 		"#equal helper inside HTML tag",
 		`<option value="test" {{#equal value "test"}}selected{{/equal}}>Test</option>`,