First shot at a lexer.

mk.go

@@ -0,0 +1,24 @@
+
+package main
+
+import (
+    "fmt"
+    "os"
+    "io/ioutil"
+)
+
+func main() {
+    input, _ := ioutil.ReadAll(os.Stdin)
+    l, tokens := lex(string(input))
+
+    for t := range tokens {
+        if t.typ == tokenError {
+            fmt.Printf("Error: %s", l.errmsg)
+            break
+        }
+
+        fmt.Println(t.String())
+    }
+}
+
+