1 files changed, 53 insertions, 0 deletions
diff --git a/src/ui/inputHandler.ts b/src/ui/inputHandler.ts
new file mode 100644
index 0000000..74bfdd8
--- /dev/null
+++ b/src/ui/inputHandler.ts
@@ -0,0 +1,53 @@
+export enum Key {
+  CTRL_C = "ctrl_c",
+  LEFT_ARROW = "left_arrow",
+  RIGHT_ARROW = "right_arrow",
+}
+
+const keyToBuffer: Record<Key, Buffer> = {
+  [Key.CTRL_C]: Buffer.from("\u0003"),
+  [Key.LEFT_ARROW]: Buffer.from("\u001b[D"),
+  [Key.RIGHT_ARROW]: Buffer.from("\u001b[C"),
+};
+
+export const createAndBindHandler = (
+  onInput: (key: Key) => any,
+  onExit: () => any
+) => {
+  process.stdin.setRawMode(true);
+
+  let seq = Buffer.alloc(0);
+
+  process.stdin.on("data", (inputBuffer) => {
+    seq = Buffer.concat([seq, inputBuffer]);
+
+    for (const [key, buffer] of Object.entries(keyToBuffer) as [
+      Key,
+      Buffer
+    ][]) {
+      if (
+        !(
+          seq.length >= buffer.length &&
+          seq.slice(-buffer.length).equals(buffer)
+        )
+      ) {
+        continue;
+      }
+      {
+        if (key === Key.CTRL_C) {
+          onExit();
+        } else {
+          onInput(key);
+        }
+        seq = Buffer.alloc(0);
+        return;
+      }
+    }
+
+    if (seq.length > 6) {
+      seq = Buffer.alloc(0);
+    }
+  });
+
+  process.stdin.resume();
+};