Add Markup type

crates/ra_ide/src/markup.rs

@@ -0,0 +1,38 @@
+//! Markdown formatting.
+//!
+//! Sometimes, we want to display a "rich text" in the UI. At the moment, we use
+//! markdown for this purpose. It doesn't feel like a right option, but that's
+//! what is used by LSP, so let's keep it simple.
+use std::fmt;
+
+#[derive(Default, Debug)]
+pub struct Markup {
+    text: String,
+}
+
+impl From<Markup> for String {
+    fn from(markup: Markup) -> Self {
+        markup.text
+    }
+}
+
+impl fmt::Display for Markup {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(&self.text, f)
+    }
+}
+
+impl Markup {
+    pub fn as_str(&self) -> &str {
+        self.text.as_str()
+    }
+    pub fn is_empty(&self) -> bool {
+        self.text.is_empty()
+    }
+    pub fn push_section(&mut self, section: &str) {
+        if !self.text.is_empty() {
+            self.text.push_str("\n\n___\n");
+        }
+        self.text.push_str(section);
+    }
+}