diff --git a/canvassyncer/__main__.py b/canvassyncer/__main__.py
index 162692c..cd897ce 100644
--- a/canvassyncer/__main__.py
+++ b/canvassyncer/__main__.py
@@ -328,64 +328,56 @@ def initConfig():
         oldConfig = json.load(open(CONFIG_PATH))
     elif os.path.exists("./canvassyncer.json"):
         oldConfig = json.load(open("./canvassyncer.json"))
+
+    def promptConfigStr(promptStr, key, *, defaultValOnMissing=None):
+        defaultVal = oldConfig.get(key)
+        if defaultVal is None:
+            if defaultValOnMissing is not None:
+                defaultVal = defaultValOnMissing
+            else:
+                defaultVal = ""
+        elif isinstance(defaultVal, list):
+            defaultVal = " ".join((str(val) for val in defaultVal))
+        defaultVal = str(defaultVal)
+        tipStr = f"(Default: {defaultVal})" if defaultVal else ""
+        res = input(f"{promptStr}{tipStr}: ").strip()
+        if not res:
+            res = defaultVal
+        return res
+
     print("Generating new config file...")
-    prevu = oldConfig.get("canvasURL", "") if oldConfig else "https://umjicanvas.com"
-    url = input("Canvas url(Defuault: " + prevu + "):").strip()
-    if not url:
-        url = prevu
-    tipStr = f"(Default: {oldConfig.get('token', '')})" if oldConfig else ""
-    token = input(f"Canvas access token{tipStr}:").strip()
-    if not token:
-        token = oldConfig.get("token", "")
-    tipStr = (
-        f"(Default: {' '.join(oldConfig.get('courseCodes', []))})" if oldConfig else ""
+    url = promptConfigStr(
+        "Canvas url", "canvasURL", defaultValOnMissing="https://umjicanvas.com"
     )
-    courseCodes = (
-        input(f"Courses to sync in course codes(split with space){tipStr}:")
-        .strip()
-        .split()
+    token = promptConfigStr("Canvas access token", "token")
+    courseCodesStr = promptConfigStr(
+        "Courses to sync in course codes(split with space)", "courseCodes"
     )
-    if not courseCodes:
-        courseCodes = oldConfig.get("courseCodes", [])
-    tipStr = (
-        f"(Default: {' '.join([str(item) for item in oldConfig.get('courseIDs', [])])})"
-        if oldConfig
-        else ""
+    courseCodes = courseCodesStr.split()
+    courseIDsStr = promptConfigStr(
+        "Courses to sync in course ID(split with space)", "courseIDs"
     )
-    courseIDs = (
-        input(f"Courses to sync in course ID(split with space){tipStr}:")
-        .strip()
-        .split()
+    courseIDs = [int(courseID) for courseID in courseIDsStr.split()]
+    downloadDir = promptConfigStr(
+        "Path to save canvas files",
+        "downloadDir",
+        defaultValOnMissing=os.path.abspath(""),
     )
-    if not courseIDs:
-        courseIDs = oldConfig.get("courseIDs", [])
-    courseIDs = [int(courseID) for courseID in courseIDs]
-    tipStr = f"(Default: {oldConfig.get('downloadDir', os.path.abspath(''))})"
-    downloadDir = input(f"Path to save canvas files{tipStr}:").strip()
-    if not downloadDir:
-        downloadDir = oldConfig.get("downloadDir", os.path.abspath(""))
-    tipStr = (
-        f"(Default: {oldConfig.get('filesizeThresh', '')})"
-        if oldConfig
-        else f"(Default: 250)"
+    filesizeThreshStr = promptConfigStr(
+        "Maximum file size to download(MB)", "filesizeThresh", defaultValOnMissing=250
     )
-    filesizeThresh = input(f"Maximum file size to download(MB){tipStr}:").strip()
     try:
-        filesizeThresh = float(filesizeThresh)
+        filesizeThresh = float(filesizeThreshStr)
     except Exception:
         filesizeThresh = 250
-    json.dump(
-        {
-            "canvasURL": url,
-            "token": token,
-            "courseCodes": courseCodes,
-            "courseIDs": courseIDs,
-            "downloadDir": downloadDir,
-            "filesizeThresh": filesizeThresh,
-        },
-        open(CONFIG_PATH, mode="w", encoding="utf-8"),
-        indent=4,
-    )
+    return {
+        "canvasURL": url,
+        "token": token,
+        "courseCodes": courseCodes,
+        "courseIDs": courseIDs,
+        "downloadDir": downloadDir,
+        "filesizeThresh": filesizeThresh,
+    }
 
 
 def getConfig():
@@ -423,15 +415,17 @@ def getConfig():
         if not os.path.exists(configPath):
             print("Config file not exist, creating...")
         try:
-            initConfig()
+            json.dump(
+                initConfig(),
+                open(configPath, mode="w", encoding="utf-8"),
+                indent=4,
+            )
         except Exception as e:
             print(f"\nError: {e.__class__.__name__}. Failed to create config file.")
             if args.debug:
                 print(traceback.format_exc())
             exit(1)
-        if args.r:
-            return
-    config = json.load(open(configPath, "r", encoding="UTF-8"))
+    config = json.load(open(configPath, mode="r", encoding="utf-8"))
     config["y"] = args.y
     config["proxies"] = args.proxy
     config["no_subfolder"] = args.no_subfolder
@@ -463,10 +457,9 @@ async def sync():
     except Exception as e:
         errorName = e.__class__.__name__
         print(
-            f"Unexpected error: {errorName}. Please check your network and token!",
-            end="",
+            f"Unexpected error: {errorName}. Please check your network and token!"
+            + ("" if config["debug"] else " Or use -d for detailed information.")
         )
-        print("" if config["debug"] else " Or use -d for detailed information.")
         if config["debug"]:
             print(traceback.format_exc())
     finally: