1 files changed, 45 insertions, 0 deletions
diff --git a/src/repl.rs b/src/repl.rs
new file mode 100644
index 0000000..258718e
--- /dev/null
+++ b/src/repl.rs
@@ -0,0 +1,45 @@
+use textmode::Textmode as _;
+
+pub struct Repl {
+    prompt: String,
+    input_line: String,
+}
+
+impl Repl {
+    pub fn new() -> Self {
+        Self {
+            prompt: "$ ".into(),
+            input_line: "".into(),
+        }
+    }
+
+    pub fn input(&self) -> String {
+        self.input_line.clone()
+    }
+
+    pub fn add_input(&mut self, s: &str) {
+        self.input_line.push_str(s);
+    }
+
+    pub fn backspace(&mut self) {
+        self.input_line.pop();
+    }
+
+    pub fn clear_input(&mut self) {
+        self.input_line.clear();
+    }
+
+    pub fn lines(&self) -> usize {
+        1 // XXX handle wrapping, multiline prompts
+    }
+
+    pub async fn render(
+        &self,
+        out: &mut textmode::Output,
+    ) -> anyhow::Result<()> {
+        out.move_to(23, 0);
+        out.write_str(&self.prompt);
+        out.write_str(&self.input_line);
+        Ok(())
+    }
+}