diff --git a/pangu.py b/pangu.py
deleted file mode 100644
index f1a3cb7..0000000
--- a/pangu.py
+++ /dev/null
@@ -1,191 +0,0 @@
-#!/usr/bin/env python
-# coding: utf-8
-"""
-Paranoid text spacing for good readability, to automatically insert whitespace between CJK (Chinese, Japanese, Korean) and half-width characters (alphabetical letters, numerical digits and symbols).
-
->>> import pangu
->>> nwe_text = pangu.spacing_text('當你凝視著bug，bug也凝視著你')
->>> print(nwe_text)
-'當你凝視著 bug，bug 也凝視著你'
->>> nwe_content = pangu.spacing_file('path/to/file.txt')
->>> print(nwe_content)
-'與 PM 戰鬥的人，應當小心自己不要成為 PM'
-"""
-
-import argparse
-import os
-import re
-import sys
-
-__version__ = '4.0.6.1'
-__all__ = ['spacing_text', 'spacing_file', 'spacing', 'cli']
-
-CJK = r'\u2e80-\u2eff\u2f00-\u2fdf\u3040-\u309f\u30a0-\u30fa\u30fc-\u30ff\u3100-\u312f\u3200-\u32ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff'
-
-ANY_CJK = re.compile(r'[{CJK}]'.format(CJK=CJK))
-
-CONVERT_TO_FULLWIDTH_CJK_SYMBOLS_CJK = re.compile('([{CJK}])([ ]*(?:[\\:]+|\\.)[ ]*)([{CJK}])'.format(CJK=CJK))  # there is an extra non-capturing group compared to JavaScript version
-CONVERT_TO_FULLWIDTH_CJK_SYMBOLS = re.compile('([{CJK}])[ ]*([~\\!;,\\?]+)[ ]*'.format(CJK=CJK))
-DOTS_CJK = re.compile('([\\.]{{2,}}|\u2026)([{CJK}])'.format(CJK=CJK))  # need to escape { }
-FIX_CJK_COLON_ANS = re.compile('([{CJK}])\\:([A-Z0-9\\(\\)])'.format(CJK=CJK))
-
-CJK_QUOTE = re.compile('([{CJK}])([`"\u05f4])'.format(CJK=CJK))  # no need to escape `
-QUOTE_CJK = re.compile('([`"\u05f4])([{CJK}])'.format(CJK=CJK))  # no need to escape `
-FIX_QUOTE_ANY_QUOTE = re.compile(r'([`"\u05f4]+)(\s*)(.+?)(\s*)([`"\u05f4]+)')
-
-CJK_SINGLE_QUOTE_BUT_POSSESSIVE = re.compile("([{CJK}])('[^s])".format(CJK=CJK))
-SINGLE_QUOTE_CJK = re.compile("(')([{CJK}])".format(CJK=CJK))
-FIX_POSSESSIVE_SINGLE_QUOTE = re.compile("([{CJK}A-Za-z0-9])( )('s)".format(CJK=CJK))
-
-HASH_ANS_CJK_HASH = re.compile('([{CJK}])(#)([{CJK}]+)(#)([{CJK}])'.format(CJK=CJK))
-CJK_HASH = re.compile('([{CJK}])(#([^ ]))'.format(CJK=CJK))
-HASH_CJK = re.compile('(([^ ])#)([{CJK}])'.format(CJK=CJK))
-
-CJK_OPERATOR_ANS = re.compile('([{CJK}])([\\+\\-\\*\\/=&\\|<>])([A-Za-z0-9])'.format(CJK=CJK))
-ANS_OPERATOR_CJK = re.compile('([A-Za-z0-9])([\\+\\-\\*\\/=&\\|<>])([{CJK}])'.format(CJK=CJK))
-
-FIX_SLASH_AS = re.compile(r'([/]) ([a-z\-_\./]+)')
-FIX_SLASH_AS_SLASH = re.compile(r'([/\.])([A-Za-z\-_\./]+) ([/])')
-
-CJK_LEFT_BRACKET = re.compile('([{CJK}])([\\(\\[\\{{<>\u201c])'.format(CJK=CJK))  # need to escape {
-RIGHT_BRACKET_CJK = re.compile('([\\)\\]\\}}<>\u201d])([{CJK}])'.format(CJK=CJK))  # need to escape }
-FIX_LEFT_BRACKET_ANY_RIGHT_BRACKET = re.compile(r'([\(\[\{<\u201c]+)(\s*)(.+?)(\s*)([\)\]\}>\u201d]+)')  # need to escape { }
-ANS_CJK_LEFT_BRACKET_ANY_RIGHT_BRACKET = re.compile('([A-Za-z0-9{CJK}])[ ]*([\u201c])([A-Za-z0-9{CJK}\\-_ ]+)([\u201d])'.format(CJK=CJK))
-LEFT_BRACKET_ANY_RIGHT_BRACKET_ANS_CJK = re.compile('([\u201c])([A-Za-z0-9{CJK}\\-_ ]+)([\u201d])[ ]*([A-Za-z0-9{CJK}])'.format(CJK=CJK))
-
-AN_LEFT_BRACKET = re.compile(r'([A-Za-z0-9])([\(\[\{])')
-RIGHT_BRACKET_AN = re.compile(r'([\)\]\}])([A-Za-z0-9])')
-
-CJK_ANS = re.compile('([{CJK}])([A-Za-z\u0370-\u03ff0-9@\\$%\\^&\\*\\-\\+\\\\=\\|/\u00a1-\u00ff\u2150-\u218f\u2700—\u27bf])'.format(CJK=CJK))
-ANS_CJK = re.compile('([A-Za-z\u0370-\u03ff0-9~\\!\\$%\\^&\\*\\-\\+\\\\=\\|;:,\\./\\?\u00a1-\u00ff\u2150-\u218f\u2700—\u27bf])([{CJK}])'.format(CJK=CJK))
-
-S_A = re.compile(r'(%)([A-Za-z])')
-
-MIDDLE_DOT = re.compile(r'([ ]*)([\u00b7\u2022\u2027])([ ]*)')
-
-# Python version only
-TILDES = re.compile(r'~+')
-EXCLAMATION_MARKS = re.compile(r'!+')
-SEMICOLONS = re.compile(r';+')
-COLONS = re.compile(r':+')
-COMMAS = re.compile(r',+')
-PERIODS = re.compile(r'\.+')
-QUESTION_MARKS = re.compile(r'\?+')
-
-
-def convert_to_fullwidth(symbols):
-    symbols = TILDES.sub('～', symbols)
-    symbols = EXCLAMATION_MARKS.sub('！', symbols)
-    symbols = SEMICOLONS.sub('；', symbols)
-    symbols = COLONS.sub('：', symbols)
-    symbols = COMMAS.sub('，', symbols)
-    symbols = PERIODS.sub('。', symbols)
-    symbols = QUESTION_MARKS.sub('？', symbols)
-    return symbols.strip()
-
-
-def spacing(text):
-    """
-    Perform paranoid text spacing on text.
-    """
-    if len(text) <= 1 or not ANY_CJK.search(text):
-        return text
-
-    new_text = text
-
-    # TODO: refactoring
-    matched = CONVERT_TO_FULLWIDTH_CJK_SYMBOLS_CJK.search(new_text)
-    while matched:
-        start, end = matched.span()
-        new_text = ''.join((new_text[:start + 1], convert_to_fullwidth(new_text[start + 1:end - 1]), new_text[end - 1:]))
-        matched = CONVERT_TO_FULLWIDTH_CJK_SYMBOLS_CJK.search(new_text)
-
-    matched = CONVERT_TO_FULLWIDTH_CJK_SYMBOLS.search(new_text)
-    while matched:
-        start, end = matched.span()
-        new_text = ''.join((new_text[:start + 1].strip(), convert_to_fullwidth(new_text[start + 1:end]), new_text[end:].strip()))
-        matched = CONVERT_TO_FULLWIDTH_CJK_SYMBOLS.search(new_text)
-
-    new_text = DOTS_CJK.sub(r'\1 \2', new_text)
-    new_text = FIX_CJK_COLON_ANS.sub(r'\1：\2', new_text)
-
-    new_text = CJK_QUOTE.sub(r'\1 \2', new_text)
-    new_text = QUOTE_CJK.sub(r'\1 \2', new_text)
-    new_text = FIX_QUOTE_ANY_QUOTE.sub(r'\1\3\5', new_text)
-
-    new_text = CJK_SINGLE_QUOTE_BUT_POSSESSIVE.sub(r'\1 \2', new_text)
-    new_text = SINGLE_QUOTE_CJK.sub(r'\1 \2', new_text)
-    new_text = FIX_POSSESSIVE_SINGLE_QUOTE.sub(r"\1's", new_text)
-
-    new_text = HASH_ANS_CJK_HASH.sub(r'\1 \2\3\4 \5', new_text)
-    new_text = CJK_HASH.sub(r'\1 \2', new_text)
-    new_text = HASH_CJK.sub(r'\1 \3', new_text)
-
-    new_text = CJK_OPERATOR_ANS.sub(r'\1 \2 \3', new_text)
-    new_text = ANS_OPERATOR_CJK.sub(r'\1 \2 \3', new_text)
-
-    new_text = FIX_SLASH_AS.sub(r'\1\2', new_text)
-    new_text = FIX_SLASH_AS_SLASH.sub(r'\1\2\3', new_text)
-
-    new_text = CJK_LEFT_BRACKET.sub(r'\1 \2', new_text)
-    new_text = RIGHT_BRACKET_CJK.sub(r'\1 \2', new_text)
-    new_text = FIX_LEFT_BRACKET_ANY_RIGHT_BRACKET.sub(r'\1\3\5', new_text)
-    new_text = ANS_CJK_LEFT_BRACKET_ANY_RIGHT_BRACKET.sub(r'\1 \2\3\4', new_text)
-    new_text = LEFT_BRACKET_ANY_RIGHT_BRACKET_ANS_CJK.sub(r'\1\2\3 \4', new_text)
-
-    new_text = AN_LEFT_BRACKET.sub(r'\1 \2', new_text)
-    new_text = RIGHT_BRACKET_AN.sub(r'\1 \2', new_text)
-
-    new_text = CJK_ANS.sub(r'\1 \2', new_text)
-    new_text = ANS_CJK.sub(r'\1 \2', new_text)
-
-    new_text = S_A.sub(r'\1 \2', new_text)
-
-    new_text = MIDDLE_DOT.sub('・', new_text)
-
-    return new_text.strip()
-
-
-def spacing_text(text):
-    """
-    Perform paranoid text spacing on text. An alias of `spacing()`.
-    """
-    return spacing(text)
-
-
-def spacing_file(path):
-    """
-    Perform paranoid text spacing from file.
-    """
-    # TODO: read line by line
-    with open(os.path.abspath(path)) as f:
-        return spacing_text(f.read())
-
-
-def cli(args=None):
-    if not args:
-        args = sys.argv[1:]
-
-    parser = argparse.ArgumentParser(
-        prog='pangu',
-        description='pangu.py -- Paranoid text spacing for good readability, to automatically insert whitespace between CJK and half-width characters (alphabetical letters, numerical digits and symbols).',
-    )
-    parser.add_argument('-v', '--version', action='version', version=__version__)
-    parser.add_argument('-t', '--text', action='store_true', dest='is_text', required=False, help='specify the input value is a text')
-    parser.add_argument('-f', '--file', action='store_true', dest='is_file', required=False, help='specify the input value is a file path')
-    parser.add_argument('text_or_path', action='store', type=str, help='the text or file path to apply spacing')
-
-    if not sys.stdin.isatty():
-        print(spacing_text(sys.stdin.read()))  # noqa: T003
-    else:
-        args = parser.parse_args(args)
-        if args.is_text:
-            print(spacing_text(args.text_or_path))  # noqa: T003
-        elif args.is_file:
-            print(spacing_file(args.text_or_path))  # noqa: T003
-        else:
-            print(spacing_text(args.text_or_path))  # noqa: T003
-
-
-if __name__ == '__main__':
-    cli()
\ No newline at end of file
diff --git a/panguFilter.cabal b/panguFilter.cabal
index 181782e..41be4c8 100644
--- a/panguFilter.cabal
+++ b/panguFilter.cabal
@@ -59,7 +59,7 @@ library
     import:           warnings
 
     -- Modules exported by the library.
-    exposed-modules:  MyLib
+    exposed-modules:  Pangu
 
     -- Modules included in this library but not exported.
     -- other-modules:
diff --git a/src/MyLib.hs b/src/Pangu.hs
similarity index 98%
rename from src/MyLib.hs
rename to src/Pangu.hs
index 57656b5..49c737e 100644
--- a/src/MyLib.hs
+++ b/src/Pangu.hs
@@ -1,6 +1,6 @@
 {-# LANGUAGE OverloadedStrings #-}
 
-module MyLib where
+module Pangu (pangu, isCJK) where
 
 import Data.Function (fix)
 import Data.Text (Text)
@@ -218,10 +218,7 @@ anscjk = do
 
 -- rule set, the order matters
 recursiveRules :: RuleSet
-recursiveRules =
-  [ fullwidthCJKsymCJK,
-    fullwidthCJKsym
-  ]
+recursiveRules = [fullwidthCJKsymCJK, fullwidthCJKsym]
 
 onepassRules :: RuleSet
 onepassRules =
diff --git a/test/Main.hs b/test/Main.hs
index 2b363cb..57e250d 100644
--- a/test/Main.hs
+++ b/test/Main.hs
@@ -1,12 +1,12 @@
 {-# LANGUAGE OverloadedStrings #-}
 module Main (main) where
-import MyLib
+import Pangu
 import Test.Hspec
 
 
 main :: IO ()
 main = hspec $ do
-  describe "MyLib.cjksym(cjk)" $ do
+  describe "Pangu.cjksym(cjk)" $ do
     it "converts symbols to fullwidth" $ do
       pangu "你 : 好" `shouldBe` "你：好"
       pangu "你.好" `shouldBe` "你。好"