refactor, allowed to specify full underline

code_markup/src/markup/attribute.rs

@@ -66,11 +66,19 @@ pub enum Attribute {
     },
 
     Underline {
-        underline_start: UnderlineStart,
-        underline_end: UnderlineEnd,
+        underline_spec: UnderlineSpec,
     },
 }
 
+#[derive(Debug)]
+pub enum UnderlineSpec {
+    Partial{
+        start: usize,
+        end: usize,
+    },
+    Full
+}
+
 #[derive(Debug, Default)]
 pub struct Attributes {
     pub all: Vec<Attribute>,