separate traits

src/line/list/gemtext.rs

@@ -0,0 +1,26 @@
+use super::TAG;
+
+pub trait Gemtext {
+    /// Get [Gemtext](https://geminiprotocol.net/docs/gemtext-specification.gmi) value for `Self`
+    fn as_value(&self) -> Option<&str>;
+    /// Convert `Self` to [Gemtext](https://geminiprotocol.net/docs/gemtext-specification.gmi) line
+    fn to_source(&self) -> String;
+}
+
+impl Gemtext for str {
+    fn as_value(&self) -> Option<&str> {
+        self.strip_prefix(TAG).map(|s| s.trim())
+    }
+    fn to_source(&self) -> String {
+        format!("{TAG} {}", self.trim())
+    }
+}
+
+#[test]
+fn test() {
+    const SOURCE: &str = "* Item";
+    const VALUE: &str = "Item";
+
+    assert_eq!(SOURCE.as_value(), Some(VALUE));
+    assert_eq!(VALUE.to_source(), SOURCE)
+}