Replace .bind(this); with ES6 instance functions

debind.py

import os
import re

for base, dirs, files in os.walk('src/app'):
    for file in files:
        path = os.path.join(base, file)

        if file.endswith('.js') || file.endswith('.jsx') || file.endswith('.ts') || file.endswith('.tsx'):
            lines = open(path).read().splitlines()

            binds = [(i, x) for i, x in enumerate(lines) if '.bind(this);' in x]

            if len(binds) == 0:
                continue

            if lines[binds[0][0]-1] == '':
                lines[binds[0][0]-1] = None

            for i, _ in binds:
                lines[i] = None

            lines = [x for x in lines if x is not None]

            for _, bind in binds:
                name_matches = re.search('this.(\w+) = this.\w+.bind\(this\);', bind)
                name = name_matches.group(1)

                matches = None

                for i, line in enumerate(lines):
                    matches = re.search('^([ ]+)%s\((.*?)\) \{$' % name, line)
                    if matches:
                        break
                    matches = re.search('^([ ]+)%s\((.*?)\): void \{$' % name, line)
                    if matches:
                        break
                    matches = re.search('^([ ]+)private %s\((.*?)\) \{$' % name, line)
                    if matches:
                        break
                    matches = re.search('^([ ]+)private %s\((.*?)\): void \{$' % name, line)
                    if matches:
                        break
                    matches = re.search('^([ ]+)public %s\((.*?)\) \{$' % name, line)
                    if matches:
                        break
                    matches = re.search('^([ ]+)public %s\((.*?)\): void \{$' % name, line)
                    if matches:
                        break


                if matches is not None:
                    lines[i] = '%s%s = (%s) => {' % (matches.group(1), name, matches.group(2))
                else:
                    print 'Not found', path, name

            newcontent = '\n'.join(lines)
            newcontent.strip()
            newcontent += '\n'

            open(path, 'w').write(newcontent)