1 files changed, 42 insertions, 1 deletions
diff --git a/runtime/ops/tty.rs b/runtime/ops/tty.rs
index 3227ee562..6cc129883 100644
--- a/runtime/ops/tty.rs
+++ b/runtime/ops/tty.rs
@@ -5,6 +5,13 @@ use std::io::Error;
 use deno_core::error::AnyError;
 use deno_core::op2;
 use deno_core::OpState;
+use rustyline::config::Configurer;
+use rustyline::error::ReadlineError;
+use rustyline::Cmd;
+use rustyline::Editor;
+use rustyline::KeyCode;
+use rustyline::KeyEvent;
+use rustyline::Modifiers;
 
 #[cfg(unix)]
 use deno_core::ResourceId;
@@ -43,7 +50,12 @@ use winapi::um::wincon;
 
 deno_core::extension!(
   deno_tty,
-  ops = [op_stdin_set_raw, op_isatty, op_console_size],
+  ops = [
+    op_stdin_set_raw,
+    op_isatty,
+    op_console_size,
+    op_read_line_prompt
+  ],
   state = |state| {
     #[cfg(unix)]
     state.put(TtyModeStore::default());
@@ -320,3 +332,32 @@ mod tests {
     );
   }
 }
+
+#[op2]
+#[string]
+pub fn op_read_line_prompt(
+  #[string] prompt_text: &str,
+  #[string] default_value: &str,
+) -> Result<Option<String>, AnyError> {
+  let mut editor = Editor::<(), rustyline::history::DefaultHistory>::new()
+    .expect("Failed to create editor.");
+
+  editor.set_keyseq_timeout(1);
+  editor
+    .bind_sequence(KeyEvent(KeyCode::Esc, Modifiers::empty()), Cmd::Interrupt);
+
+  let read_result =
+    editor.readline_with_initial(prompt_text, (default_value, ""));
+  match read_result {
+    Ok(line) => Ok(Some(line)),
+    Err(ReadlineError::Interrupted) => {
+      // SAFETY: Disable raw mode and raise SIGINT.
+      unsafe {
+        libc::raise(libc::SIGINT);
+      }
+      Ok(None)
+    }
+    Err(ReadlineError::Eof) => Ok(None),
+    Err(err) => Err(err.into()),
+  }
+}