Add color

handler.py

@@ -1,2 +1,41 @@
+import binascii
+import itertools
+
+RED = "\033[31m"
+GREEN = "\033[32m"
+YELLOW = "\033[33m"
+BLUE = "\033[34m"
+RESET = "\033[0m"
+
+
+class Diff:
+    def __init__(self, c1, c2):
+        self.state = ""
+        self.c1 = c1
+        self.c2 = c2
+
+    def consume(self, s: str):
+        for p, c in itertools.zip_longest(self.state, s):
+            if c is None:
+                break
+            if p == c:
+                print(f"{self.c1}{c}{RESET}", end="")
+            else:
+                print(f"{self.c2}{c}{RESET}", end="")
+        self.state = s
+        print()
+
+
+d_c = Diff(GREEN, RED)
+d_s = Diff(BLUE, YELLOW)
+
+
 def handle(tag: str, data: bytes):
-    print(tag, repr(data))
+    msg = data.decode().strip()
+    if msg.startswith("0c") or msg.startswith("0a"):
+        # ping, ignore
+        return
+    if tag == "server":
+        d_s.consume(msg)
+    else:
+        d_c.consume(msg)