diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ed49f1d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,87 @@
+# magiᴄʟɪ✨
+
+Automatically turn functions of file into command line interface.
+
+## Install
+
+```
+pip install magicli
+```
+
+## Get started
+
+Basic usage example.
+By default, every function except for the `main` function is callable through command line arguments.
+
+```python
+from magicli import magicli
+
+def main():
+    magicli()
+```
+
+### Define name of CLI in `setup.py`
+
+In order to define the name of the CLI, it needs to be defined in the `setup.py` file. The following code sets up a sample CLI with the following folder structure.
+
+```bash
+hello/
+└── setup.py
+└── hello.py
+```
+
+`setup.py`
+
+```python
+from setuptools import setup
+
+setup(
+    name='hello',
+    version='0.1.0',
+    install_requires=[
+        'magicli'
+    ],
+    entry_points={
+        'console_scripts':[
+            'hello=hello:main'
+        ]
+    }
+)
+```
+
+`hello.py`
+
+```python
+from magicli import magicli
+
+def main():
+    magicli()
+
+def hello(name='World', amount=1):
+    for _ in range(int(amount)):
+        print(f'Hello {name}!')
+```
+
+The script can then be called in the following way.
+
+```bash
+hello Name --amount 3
+```
+
+This outputs
+
+```bash
+Hello Name!
+Hello Name!
+Hello Name!
+```
+
+### Help message
+
+By default, a help message will be created based on the available functions.
+For the example above, calling `hello --help` will display this help message.
+
+```bash
+Usage:
+    hello --name --amount
+```
diff --git a/readme.md b/readme.md
deleted file mode 100644
index 2f9e0e0..0000000
--- a/readme.md
+++ /dev/null
@@ -1,97 +0,0 @@
-# magiᴄʟɪ✨
-
-Automatically call args parsed by `docopt` as functions.
-
-## Install
-
-```
-pip install git+https://git.beelm.eu/patrick/magicli
-```
-
-## Get started
-
-Basic usage example.
-
-```python
-from docopt import docopt
-from magicli import magicli
-def cli():
-    magicli(docopt(__doc__))
-```
-
-Functions that share a name with the keys or `dict` returned by `docopt` are automatically called with all required args if specified (Note that keys are converted to valid python function names, i.e. stripping the characters `<` `>` `-` and replacing `-` with `_`).
-
-All functions that are called this way need to be imported.
-
-`magicli` also returns a dict with converted keys, and these can be used as `args` if needed.
-
-```python
-args = magicli(docopt(__doc__))
-```
-
-## Minimal `Hello World` example
-
-After installing, this example can be called from the command line.
-
-### hello.py
-
-```python
-"""
-    Usage:
-        magicli_example <name> [--amount=<int>]
-
-        -a=<int> --amount=<int>  How often to greet
-"""
-
-from docopt import docopt
-from magicli import magicli
-
-
-def cli():
-    magicli(docopt(__doc__))
-
-
-def main(name, amount = 1):
-    for _ in range(int(amount)):
-        print(f'Hello {name}!')
-```
-
-Note that `magicli` will automatically try to call the `main()` function.
-
-This can be changed to another function through the settings `magicli(docopt(__doc__), entry_point='another_function')`.
-
-### setup.py
-
-```python
-from setuptools import setup
-
-
-setup(
-    name='magicli_example',
-    version='0.1.0',
-    install_requires=[
-        'docopt'
-    ],
-    entry_points={
-        'console_scripts':[
-            'magicli_example=docs.example:cli'
-        ]
-    }
-)
-```
-
-Note: Make sure that the entry point specified in your setup.py is not the main function, otherwise it will not work.
-
-Calling the script:
-
-```
-magicli_example World -a 3
-```
-
-Results in the following output:
-
-```
-Hello World!
-Hello World!
-Hello World!
-```
diff --git a/setup.py b/setup.py
index 0529b6a..8b93edc 100644
--- a/setup.py
+++ b/setup.py
@@ -1,28 +1,31 @@
 from setuptools import setup
 
 
-with open('readme.md') as f:
+with open('README.md') as f:
     long_description = f.read()
+    description = long_description.split('\n')[2]
 
 
 setup(
     name='magicli',
-    version='0.1.0',
-    description='Automatically call args parsed by `docopt` as functions.',
+    version='0.1.1',
+    description=description,
     long_description=long_description,
     long_description_content_type="text/markdown",
+    package_dir={'': 'src'},
+    py_modules=[
+        'magicli',
+    ],
     install_requires=[
-        'docopt'
+        'pargv'
     ],
     extras_require={
-        'tests':[
+        'dev':[
             'pytest',
         ]
     },
-    package_dir={'': 'src'},
     keywords=[
         'python',
-        'docopt',
         'cli'
     ],
     classifiers=[
@@ -32,10 +35,5 @@ setup(
         "Programming Language :: Python :: 3",
         "Operating System :: Unix",
         "Operating System :: OS Independent",
-    ],
-    entry_points={
-        'console_scripts':[
-            'magicli_example=example:cli'
-            ]
-        },
+    ]
 )
diff --git a/src/example.py b/src/example.py
deleted file mode 100644
index a5638db..0000000
--- a/src/example.py
+++ /dev/null
@@ -1,18 +0,0 @@
-"""
-    Usage:
-        magicli_example <name> [--amount=<int>]
-
-        -a=<int> --amount=<int>  How often to greet
-"""
-
-from docopt import docopt
-from magicli import magicli
-
-
-def cli():
-    magicli(docopt(__doc__))
-
-
-def main(name, amount = 1):
-    for _ in range(int(amount)):
-        print(f'Hello {name}!')
diff --git a/src/magicli.py b/src/magicli.py
index b510d23..45e3c4d 100644
--- a/src/magicli.py
+++ b/src/magicli.py
@@ -1,61 +1,78 @@
-"""
-# Get started
-
-```python
-from docopt import docopt
-from magicli import magicli
-
-args = magically(docopt(__doc__))
-```
-"""
-
 import inspect
+import sys
+import os
+from pargv import parse_args
 
 
-def magicli(args, glbls=None, entry_point='main'):
+def magicli(exclude=['main'], help_message=True, glbls=None, argv=None):
     """
-    Calls all callable functions with all arguments.
+    Get all functions from calling file and interprets them as CLI commands.
+    Parses command line arguments for function to call
+    and calls it with all specified arguments.
+    Displays a help message  and exits if the --help flag is set
+    or if no callable function is found.
+    Errors out with a TypeError if the specified arguments are invalid. 
     """
-    # Get the `globals()` dict of the file from where the function is called.
-    if not glbls:
-        glbls = inspect.currentframe().f_back.f_globals 
+    glbls = glbls if glbls else inspect.currentframe().f_back.f_globals
+    argv = argv if argv else sys.argv
+    app_name, args, kwargs = format_args(argv)
 
-    cleaned_args = clean_args(args)
-    args = args_set_in_cli(cleaned_args)
+    functions = [f for f in filter_functions(glbls) if f.__name__ not in exclude]
 
-    # Add main function to possible callable functions.
-    # Main function will be called if it exists.
-    if entry_point not in args:
-        args[entry_point] = True
+    if help_message and 'help' in kwargs:
+        print_help_and_exit(app_name, functions)
 
-    for arg in args:
-        if arg in glbls:
-            func = glbls.get(arg)
-            func_args = inspect.getargspec(func).args
-            kwargs = {arg:args[arg] for arg in args if arg in func_args}
-            func(**kwargs)
+    possible_commands = [f.__name__ for f in functions]
+    function_name = None
 
-    return cleaned_args
+    if len(args) and args[0] in possible_commands:
+        function_name = args[0]
+        args = args[1:]
+    elif app_name in possible_commands:
+        function_name = app_name
+    else:
+        print_help_and_exit(app_name, functions)
+    
+    function_to_call = glbls.get(function_name)
+    
+    try:
+        function_to_call(*args, **kwargs)
+    except TypeError as e:
+        print_error(e)
+        raise
 
 
-def clean_args(args):
+def print_error(e):
+    print('\x1b[91mError:\x1b[0m ', end='')
+    print(e)
+
+
+def format_args(argv):
+    args, kwargs = parse_args(argv)
+    app_name = os.path.basename(args[0])
+    args = args[1:]
+    return app_name, args, kwargs
+
+
+def filter_functions(args):
     """
-    Creates a new dict of variables converted to correct function names.
+    Gets list of functions from the globals variable of a specific module (default: __main__).
     """
-    return {parse_function_name(key): args[key] for key in args}
+    return [v for k, v in args.items() if inspect.isfunction(v) and v.__module__ == args['__name__']]
 
 
-def parse_function_name(func):
+def print_help_and_exit(app_name, functions):
     """
-    Convert variables to valid python function names.
+    Print the help message based on functions contained in the calling file.
+    Exits after displaying the help message.
     """
-    for char in ['<', '>', '-']:
-        func = func.strip(char)
-    return func.replace('-', '_')
-
-
-def args_set_in_cli(args):
-    """
-    Returns a list of all dictionary entries that are specified in cli.
-    """
-    return {arg:args[arg] for arg in args if args[arg]}
+    print('Usage:')
+    for f in functions:
+        words = []
+        if app_name != f.__name__:
+            words.append(app_name)
+        words.append(f.__name__)
+        specs = inspect.getfullargspec(f)
+        words += ['--' + arg for arg in specs.args]
+        print(' '*4 + ' '.join(words))
+    exit()
diff --git a/tests/test_failures.py b/tests/test_failures.py
new file mode 100644
index 0000000..336c6a6
--- /dev/null
+++ b/tests/test_failures.py
@@ -0,0 +1,23 @@
+from unittest import mock
+import pytest
+from magicli import magicli
+
+
+def test_command_with_invalid_arguments(capsys):
+    inputs = [
+        'appname command_with_invalid_arguments --name=Name',
+        'appname command_with_invalid_arguments',
+        'command_with_invalid_arguments magicli 2 invalid',
+    ]
+    error_message = '\x1b[91mError:\x1b[0m '
+    for i in inputs:
+        args = i.split()
+        with mock.patch('sys.argv', args):
+            with pytest.raises(TypeError):
+                magicli(exclude=['test_command_with_invalid_arguments'])
+        out, err = capsys.readouterr()
+        assert out.startswith(error_message)
+
+
+def command_with_invalid_arguments(name, amount):
+    pass
\ No newline at end of file
diff --git a/tests/test_functionality.py b/tests/test_functionality.py
new file mode 100644
index 0000000..5aad49a
--- /dev/null
+++ b/tests/test_functionality.py
@@ -0,0 +1,27 @@
+from unittest import mock
+import pytest
+import sys
+from magicli import magicli
+
+
+@pytest.mark.parametrize('inputs, output', (
+    ('appname command --name=Name --amount=3',
+     'Hello Name!\nHello Name!\nHello Name!\n'),
+    ('appname command Name 3',
+     'Hello Name!\nHello Name!\nHello Name!\n'),
+    ('appname command',
+     'Hello World!\n'),
+    ('command magicli 2',
+     'Hello magicli!\nHello magicli!\n'),
+))
+def test_valid_command_line_arguments(inputs, output, capsys):
+    args = inputs.split()
+    with mock.patch('sys.argv', args):
+        magicli(exclude=['test_valid_command_line_arguments'])
+    out, err = capsys.readouterr()
+    assert out == output
+
+
+def command(name='World', amount=1):
+    for _ in range(int(amount)):
+        print(f'Hello {name}!')
diff --git a/tests/test_help_message.py b/tests/test_help_message.py
new file mode 100644
index 0000000..7135ee6
--- /dev/null
+++ b/tests/test_help_message.py
@@ -0,0 +1,23 @@
+from unittest import mock
+import pytest
+from magicli import magicli
+
+
+def test_help_message(capsys):
+    inputs = [
+        'appname --help',
+        'appname command --help',
+        'appname command --name=Name --amount=3 --help',
+    ]
+    help_message='Usage:\n    appname command_with_arguments --positional --optional\n'
+    for i in inputs:
+        args = i.split()
+        with mock.patch('sys.argv', args):
+            with pytest.raises(SystemExit):
+                magicli(exclude=['test_help_message'])
+        out, err = capsys.readouterr()
+        assert out.startswith(help_message)
+
+
+def command_with_arguments(positional, optional=True):
+    pass
\ No newline at end of file
diff --git a/tests/test_magicli.py b/tests/test_magicli.py
deleted file mode 100644
index 9c4d414..0000000
--- a/tests/test_magicli.py
+++ /dev/null
@@ -1,34 +0,0 @@
-from magicli import clean_args
-from magicli import parse_function_name
-from magicli import args_set_in_cli
-
-
-def test_clean_args():
-    args = {
-        "<name-1>": True,
-        "--name-2": False
-    }
-    assert clean_args(args) == {
-        "name_1": True,
-        "name_2": False
-    }
-
-
-def test_parse_function_name():
-    assert parse_function_name('<name-1>') == 'name_1'
-    assert parse_function_name('--name-2') == 'name_2'
-
-
-def test_args_set_in_cli():
-    args = {
-        "a": True,
-        "b": False,
-        "c": None,
-        "d": 1,
-        "e": "a"
-    }
-    assert args_set_in_cli(args) == {
-        "a": True,
-        "d": 1,
-        "e": "a"
-    }