Change coding rules for C++ class member from variable_ to m_variable

m_coding_rule.py

"""
In all files passed in argument, change coding rules for C++ class member from
variable_ to m_variable.
"""
import sys
import re

def main():
    pattern = re.compile(r'(\b\w+)_\b')

    for fp in sys.argv[1:]:
        # Read file.
        string = open(fp).read()

        # Replace variable_ with m_variable
        new_string, number_of_subs_made = re.subn(pattern, r'm_\1', string)

        # Write new file.
        with open(fp,'w') as f:
            f.write(new_string)

        # Report changes.
        if number_of_subs_made:
            print(fp, number_of_subs_made)

if __name__ == '__main__':
    main()