define function with dependent function if called locally/inside

test1.py

import inspect

l = []
copy_dict = dict(locals())
for key, value in copy_dict.items():
    if "function" in str(value) and callable(value) and value.__module__ == __name__:
        l.append(key)
# print(l)

def increment_indent(a):
    b = a.splitlines()
    # hmm = set()
    for i in b:
        leading_spaces = len(i) - len(i.lstrip())
        # hmm.add(leading_spaces)
    # get smallest number here, if it's 4, 8, or 2, then use that as indentation for everything
    uh = ""
    for i in b:
        uh += 4 * " " + i
        uh += "\n"
    return uh

def test1():
    return "World"

def test2():
    print("Hello")
    print(test1())

l = []
copy_dict = dict(locals())
for key, value in copy_dict.items():
    if "function" in str(value) and callable(value) and value.__module__ == __name__:
        l.append(key)
def function_merger(x):
    total = ""
    source_lines = inspect.getsourcelines(x)[0]
    for i in source_lines:
        if i.startswith("def "):
            ah = source_lines
            for j in l:
                if j in "".join(ah[1:]):
                    for g in source_lines:
                        if j in g:
                            total += increment_indent("".join(inspect.getsourcelines(eval(j))[0]))
                            total += g
                        else:
                            total += g
    return total

# output:
"""
def test2():
    print("Hello")
def test1():
    return "World"
    print(test1())
"""

print(function_merger(test2))
# wanted result:
"""
def test2():
    print("Hello")
    def test1():
        return "World"
    print(test1())
"""