From d1e11bde19b8069111b22686eadc983058a517de Mon Sep 17 00:00:00 2001
From: Chuck Smith <smitty7887@gmail.com>
Date: Sun, 14 Jan 2024 21:35:27 -0500
Subject: [PATCH] add basic repl

---
 main.go      | 19 +++++++++++++++++++
 repl/repl.go | 30 ++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 main.go
 create mode 100644 repl/repl.go

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..830498c
--- /dev/null
+++ b/main.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"monkey/repl"
+	"os"
+	user2 "os/user"
+)
+
+func main() {
+	user, err := user2.Current()
+
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("Hello %s! This is the Monkey programmig language!\n", user.Username)
+	fmt.Printf("Feel free to type in commands\n")
+	repl.Start(os.Stdin, os.Stdout)
+}
diff --git a/repl/repl.go b/repl/repl.go
new file mode 100644
index 0000000..f78eaf3
--- /dev/null
+++ b/repl/repl.go
@@ -0,0 +1,30 @@
+package repl
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"monkey/lexer"
+	"monkey/token"
+)
+
+const PROMPT = ">> "
+
+func Start(in io.Reader, out io.Writer) {
+	scanner := bufio.NewScanner(in)
+
+	for {
+		fmt.Fprintf(out, PROMPT)
+		scanned := scanner.Scan()
+		if !scanned {
+			return
+		}
+
+		line := scanner.Text()
+		l := lexer.New(line)
+
+		for tok := l.NextToken(); tok.Type != token.EOF; tok = l.NextToken() {
+			fmt.Fprintf(out, "%+v\n", tok)
+		}
+	}
+}