feat: front matter keys are sorted alphabetically

Author: viktomas

main.go

@@ -92,12 +92,17 @@ func parseUnquotedProperties(param string) []string {
 }
 
 func render(p page, dontQuote []string) string {
+	sortedKeys := make([]string, 0, len(p.attributes))
+	for k := range p.attributes {
+		sortedKeys = append(sortedKeys, k)
+	}
+	slices.Sort(sortedKeys)
 	attributeBuilder := strings.Builder{}
-	for name, value := range p.attributes {
-		if slices.Contains(dontQuote, name) {
-			attributeBuilder.WriteString(fmt.Sprintf("%s: %s\n", name, value))
+	for _, key := range sortedKeys {
+		if slices.Contains(dontQuote, key) {
+			attributeBuilder.WriteString(fmt.Sprintf("%s: %s\n", key, p.attributes[key]))
 		} else {
-			attributeBuilder.WriteString(fmt.Sprintf("%s: %q\n", name, value))
+			attributeBuilder.WriteString(fmt.Sprintf("%s: %q\n", key, p.attributes[key]))
 		}
 	}
 	return fmt.Sprintf("---\n%s---\n%s", attributeBuilder.String(), p.text)

main_test.go

@@ -21,6 +21,28 @@ func TestRender(t *testing.T) {
 first: "1"
 second: "2"
 ---
+page text`, result)
+	})
+	t.Run("it renders attributes in alphabetical order", func(t *testing.T) {
+		testPage := page{
+			filename: "",
+			attributes: map[string]string{
+				"e": "1",
+				"d": "1",
+				"c": "1",
+				"b": "1",
+				"a": "1",
+			},
+			text: "page text",
+		}
+		result := render(testPage, []string{})
+		require.Equal(t, `---
+a: "1"
+b: "1"
+c: "1"
+d: "1"
+e: "1"
+---
 page text`, result)
 	})
 	t.Run("it renders attributes without quotes", func(t *testing.T) {