Merge pull request #10 from mailgun/cclark/dev

PIP-1385: add pluralize helper

helper.go

@@ -44,6 +44,7 @@ func init() {
 	RegisterHelper("ifLt", ifLtHelper)
 	RegisterHelper("ifEq", ifEqHelper)
 	RegisterHelper("ifMatchesRegexStr", ifMatchesRegexStr)
+	RegisterHelper("pluralize", pluralizeHelper)
 
 	// Register builtin param helpers.
 	RegisterParamHelper("length", lengthParamHelper)
@@ -395,6 +396,13 @@ func ifMatchesRegexStr(a, b interface{}, options *Options) interface{} {
 	return options.Inverse()
 }
 
+func pluralizeHelper(count, plural, singular interface{}) interface{} {
+	if c, err := floatValue(count); err != nil || c <= 1 {
+		return singular
+	}
+	return plural
+}
+
 // #unless block helper
 func unlessHelper(conditional interface{}, options *Options) interface{} {
 	if options.isIncludableZero() || IsTrue(conditional) {

helper_test.go

@@ -527,6 +527,49 @@ var helperTests = []Test{
 		nil, nil, nil,
 		`Length is not equal to 4`,
 	},
+	{
+		"pluralize result plural",
+		`{{pluralize error_count "errors" "error"}}`,
+		map[string]interface{}{"error_count": 3},
+		nil, nil, nil,
+		`errors`,
+	},
+	{
+		"pluralize result singular",
+		`{{pluralize error_count "errors" "error"}}`,
+		map[string]interface{}{"error_count": 1},
+		nil, nil, nil,
+		`error`,
+	},
+	{
+		"pluralize with vars result plural",
+		`{{pluralize error.count error.plural error.singular}}`,
+		map[string]interface{}{"error": map[string]interface{}{
+			"count":    3,
+			"plural":   "errors",
+			"singular": "error",
+		}},
+		nil, nil, nil,
+		`errors`,
+	},
+	{
+		"pluralize with vars result singular",
+		`{{pluralize error.count error.plural error.singular}}`,
+		map[string]interface{}{"error": map[string]interface{}{
+			"count":    1,
+			"plural":   "errors",
+			"singular": "error",
+		}},
+		nil, nil, nil,
+		`error`,
+	},
+	{
+		"pluralize count non-number",
+		`{{pluralize error_count "errors" "error"}}`,
+		map[string]interface{}{"error_count": "three"},
+		nil, nil, nil,
+		`error`,
+	},
 	{
 		"#equal helper inside HTML tag",
 		`<option value="test" {{#equal value "test"}}selected{{/equal}}>Test</option>`,