Added REPL and main function

2 files changed, 51 insertions, 1 deletions

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..deba212
--- /dev/null
+++ b/main.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/user"
+	"mana/repl"
+)
+
+func main() {
+	user, err := user.Current()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("Hello %s! Welcome to Mana REPL!\n", user.Username)
+	repl.Start(os.Stdin, os.Stdout)
+}
diff --git a/repl/repl.go b/repl/repl.go
index 9119db8..37acd49 100644
--- a/repl/repl.go
+++ b/repl/repl.go
@@ -1 +1,32 @@
-package repl
\ No newline at end of file
+package repl
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"mana/lexer"
+	"mana/tokens"
+)
+
+// PROMPT is the prompt for the REPL.
+const PROMPT = "=> "
+
+func Start(in io.Reader, out io.Writer) {
+	scanner := bufio.NewScanner(in)
+
+	for {
+		fmt.Fprint(out, PROMPT)
+		scanned := scanner.Scan()
+		
+		if !scanned {
+			return
+		}
+
+		line := scanner.Text()
+		l := lexer.New(line)
+
+		for tok := l.NextToken(); tok.Type != tokens.EOF; tok = l.NextToken() {
+			fmt.Fprintf(out, "%+v\n", tok)
+		}
+	}
+}