Implement enhanced REPL, relates to #13

Add command history and welcome message

1 files changed, 52 insertions, 0 deletions

diff --git a/src/main/com/jantuomi/tunkki/repl/Repl.java b/src/main/com/jantuomi/tunkki/repl/Repl.java
new file mode 100644
index 0000000..817d746
--- /dev/null
+++ b/src/main/com/jantuomi/tunkki/repl/Repl.java
@@ -0,0 +1,52 @@
+package com.jantuomi.tunkki.repl;
+
+import com.jantuomi.tunkki.Tunkki;
+import com.jantuomi.tunkki.exception.TunkkiError;
+import jline.console.*;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * Created by jan on 31.7.2016.
+ */
+public class Repl {
+
+    private Tunkki tunkki;
+
+    public Repl(Tunkki tunkki) {
+        this.tunkki = tunkki;
+    }
+
+    public void run() throws IOException, InterruptedException {
+        showWelcomeText();
+
+        ConsoleReader reader = new ConsoleReader();
+        reader.setBellEnabled(false);
+
+        String line;
+        PrintWriter out = new PrintWriter(System.out);
+
+        while ((line = readLine(reader, "")) != null) {
+            try {
+                tunkki.run(line);
+            }
+            catch (TunkkiError ex) {
+                ex.printStackTrace();
+                Thread.sleep(50);
+            }
+
+            out.flush();
+        }
+    }
+
+    private String readLine(ConsoleReader reader, String promptMessage)
+            throws IOException {
+        String line = reader.readLine(promptMessage + "\ntunkki> ");
+        return line.trim();
+    }
+
+    private void showWelcomeText() {
+        System.out.println(String.format("tunkki REPL version %s", tunkki.versionString()));
+    }
+}