diff --git a/Cargo.lock b/Cargo.lock
index 55cc2a4..1a3f9a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -84,6 +84,14 @@ checksum = "18a6dbe30758c9f83eb00cbea4ac95966305f5a7772f3f42ebfc7fc7eddbd8e1"
 [[package]]
 name = "oyster"
 version = "0.1.0"
+dependencies = [
+ "oyster_lineedit",
+ "oyster_parser",
+]
+
+[[package]]
+name = "oyster_lineedit"
+version = "0.0.0"
 
 [[package]]
 name = "oyster_parser"
diff --git a/crates/oyster/Cargo.toml b/crates/oyster/Cargo.toml
index 9cdf166..27099dc 100644
--- a/crates/oyster/Cargo.toml
+++ b/crates/oyster/Cargo.toml
@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+oyster_lineedit = { path = "../oyster_lineedit" }
+oyster_parser = { path = "../oyster_parser" }
diff --git a/crates/oyster/src/main.rs b/crates/oyster/src/main.rs
index e7a11a9..5e6b11c 100644
--- a/crates/oyster/src/main.rs
+++ b/crates/oyster/src/main.rs
@@ -1,3 +1,14 @@
+use oyster_lineedit::readline;
+use oyster_parser::ast::Code;
+
 fn main() {
-    println!("Hello, world!");
+    loop {
+        let prog = readline("> ").unwrap();
+
+        if prog.trim() == "exit" {
+            break;
+        }
+
+        Code::try_from(prog.as_ref()).unwrap();
+    }
 }
diff --git a/crates/oyster_lineedit/Cargo.toml b/crates/oyster_lineedit/Cargo.toml
new file mode 100644
index 0000000..ed81f51
--- /dev/null
+++ b/crates/oyster_lineedit/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "oyster_lineedit"
+version = "0.0.0"
+edition = "2021"
+
+[lib]
+doctest = false
diff --git a/crates/oyster_lineedit/src/lib.rs b/crates/oyster_lineedit/src/lib.rs
new file mode 100644
index 0000000..37efefb
--- /dev/null
+++ b/crates/oyster_lineedit/src/lib.rs
@@ -0,0 +1,11 @@
+use std::io::{self, Write};
+
+pub fn readline(prompt: &str) -> Result<String, io::Error> {
+    print!("{}", prompt);
+    io::stdout().flush()?;
+
+    let mut buf = String::new();
+    io::stdin().read_line(&mut buf)?;
+
+    Ok(buf)
+}