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480 lines
11 KiB
480 lines
11 KiB
#!/usr/bin/env python
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from __future__ import print_function, unicode_literals
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import argparse
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import io
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import logging
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import os
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import re
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import sys
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_DESCRIPTION = """\
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Migrate arbitrary `.go` sources (mostly) from the v1 to v2 API.
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"""
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_MIGRATORS = []
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def main(sysargs=sys.argv[:]):
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parser = argparse.ArgumentParser(
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description=_DESCRIPTION,
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formatter_class=argparse.ArgumentDefaultsHelpFormatter)
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parser.add_argument('path', nargs='*',
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type=os.path.abspath, default=os.getcwd())
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parser.add_argument('-w', '--write', help='write changes back to file',
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action='store_true', default=False)
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parser.add_argument('-q', '--quiet', help='quiet down the logging',
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action='store_true', default=False)
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parser.add_argument('-D', '--debug', help='debug up the logging',
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action='store_true',
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default=(os.environ.get('DEBUG') != ''))
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parser.add_argument('--selftest', help='run internal tests',
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action='store_true', default=False)
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args = parser.parse_args(sysargs[1:])
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if args.selftest:
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logging.basicConfig(
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level=logging.WARN,
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format='selftest: %(message)s'
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)
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test_migrators()
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return 0
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level = logging.FATAL if args.quiet else logging.INFO
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level = logging.DEBUG if args.debug else level
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logging.basicConfig(level=level, format='%(message)s')
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paths = args.path
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if len(paths) == 0:
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paths = ['.']
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for filepath in _find_candidate_files(paths):
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updated_source = _update_filepath(filepath)
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if args.write:
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logging.info('Updating %s', filepath)
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with io.open(filepath, 'w', encoding='utf-8') as outfile:
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outfile.write(updated_source)
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else:
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logging.info('// Updated %s:', filepath)
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print(updated_source)
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return 0
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def _find_candidate_files(paths):
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for path in paths:
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if not os.path.isdir(path):
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yield path
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continue
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for curdir, dirs, files in os.walk(path):
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for i, dirname in enumerate(dirs[:]):
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if dirname.startswith('.'):
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dirs.pop(i)
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for filename in files:
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if not filename.decode('utf-8').endswith('.go'):
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continue
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filepath = os.path.join(curdir, filename)
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if not os.access(filepath, os.R_OK | os.W_OK):
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continue
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yield filepath
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def _update_filepath(filepath):
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with io.open(filepath, encoding='utf-8') as infile:
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return _update_source(infile.read())
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def _update_source(source):
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for migrator, func in _MIGRATORS:
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logging.debug('Running %s migrator', migrator)
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source = func(source)
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return source
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def _subfmt(pattern, replfmt, source, flags=re.UNICODE):
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def repl(match):
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return replfmt.format(**match.groupdict())
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return re.sub(pattern, repl, source, flags=flags)
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def _migrator(func):
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_MIGRATORS.append((func.__name__.strip('_'), func))
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return func
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@_migrator
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def _slice_pointer_types(source):
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return _subfmt(
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'(?P<prefix>\\[\\])cli\\.(?P<type>Command|Author){',
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'{prefix}*cli.{type}{{', source
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)
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@_migrator
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def _pointer_type_literal(source):
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return _subfmt(
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'(?P<prefix>\\s+)cli\\.(?P<type>Command|Author){',
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'{prefix}&cli.{type}{{', source
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)
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@_migrator
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def _slice_types(source):
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return _subfmt(
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'&cli\\.(?P<type>IntSlice|StringSlice){(?P<args>[^}]*)}',
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'cli.New{type}({args})', source, flags=re.DOTALL | re.UNICODE
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)
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@_migrator
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def _flag_literals(source):
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return _subfmt(
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'(?P<prefix>\\s+)cli\\.(?P<type>\\w+)Flag{',
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'{prefix}&cli.{type}Flag{{', source
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)
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@_migrator
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def _v1_imports(source):
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return re.sub(
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'"(?:github\\.com|gopkg\\.in)/(?:codegangsta|urfave)/cli(?:\\.v1|)"',
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'"gopkg.in/urfave/cli.v2"', source, flags=re.UNICODE
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)
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@_migrator
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def _new_exit_error(source):
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return re.sub('cli\\.NewExitError', 'cli.Exit', source, flags=re.UNICODE)
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@_migrator
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def _bool_t_flag(source):
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return _subfmt(
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'cli\\.BoolTFlag{(?P<args>[^}]*)}',
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'cli.BoolFlag{{Value: true,{args}}}',
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source, flags=re.DOTALL | re.UNICODE
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)
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@_migrator
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def _context_args_len(source):
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return _subfmt(
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'len\\((?P<prefix>\\S+)\\.Args\\(\\)\\)',
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'{prefix}.Args().Len()', source
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)
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@_migrator
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def _context_args_index(source):
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return _subfmt(
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'\\.Args\\(\\)\\[(?P<index>\\d+)\\]',
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'.Args().Get({index})', source
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)
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@_migrator
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def _envvar_string(source):
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return re.sub(
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'EnvVar:(?P<ws>\\s+)"(?P<string>[^"]+)"',
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_envvar_string_repl, source, flags=re.UNICODE
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)
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def _envvar_string_repl(match):
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return 'EnvVars:{ws}[]string{{{value}}}'.format(
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value=', '.join([
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'"{}"'.format(s) for s in
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re.split(
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'\\s*,\\s*', match.groupdict()['string'],
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flags=re.UNICODE
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)
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]),
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**match.groupdict()
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)
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@_migrator
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def _flag_name_stringly(source):
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return re.sub(
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'(?P<prefix>\\s+)Name:(?P<ws>\\s+)"(?P<string>[^"]+)"',
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_flag_name_stringly_repl, source, flags=re.UNICODE
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)
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def _flag_name_stringly_repl(match):
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revars = dict(match.groupdict())
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string = revars['string']
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parts = list(
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reversed(
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sorted(
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filter(lambda s: len(s.strip()) > 0, [
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part.strip() for part in string.split(',')
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]), key=len
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)
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)
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)
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if len(parts) == 1:
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return '{prefix}Name:{ws}"{string}"'.format(**revars)
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return (
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'{prefix}Name:{ws}"{name}", Aliases: []string{{{aliases}}}'
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).format(
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name=parts[0],
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aliases=', '.join(['"{}"'.format(s) for s in parts[1:]]),
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**revars
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)
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@_migrator
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def _commands_opaque_type(source):
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return _subfmt(
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'cli\\.Commands(?P<suffix>[^B])',
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'[]*cli.Command{suffix}',
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source
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)
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@_migrator
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def _flag_names(source):
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return re.sub('\\.GetName\\(\\)', '.Names()[0]', source, flags=re.UNICODE)
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@_migrator
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def _app_categories(source):
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source = _subfmt(
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'(?P<prefix>range\\s+\\S+)\\.App\\.Categories\\(\\)',
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'{prefix}.App.Categories.Categories()', source
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)
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return re.sub(
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'\\.App\\.Categories\\(\\)', '.App.Categories',
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source, flags=re.UNICODE
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)
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@_migrator
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def _command_category_commands(source):
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# XXX: brittle
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return _subfmt(
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'(?P<prefix>\\s+category\\.)Commands(?P<suffix>[^(])',
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'{prefix}VisibleCommands(){suffix}', source
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)
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@_migrator
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def _context_bool_t(source):
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# XXX: probably brittle
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return _subfmt(
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'(?P<prefix>\\S+)(?:Global|)BoolT\\(',
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'!{prefix}Bool(', source
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)
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@_migrator
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def _context_global_methods(source):
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return _subfmt(
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'\\.Global(?P<method>'
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'Bool|Duration|Float64|Generic|Int|IntSlice|String|StringSlice|'
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'FlagNames|IsSet|Set'
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')\\(',
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'.{method}(', source
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)
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@_migrator
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def _context_parent(source):
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# XXX: brittle
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return re.sub('\\.Parent\\(\\)', '.Lineage()[1]', source, flags=re.UNICODE)
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@_migrator
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def _app_init(source):
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return re.sub(
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'cli\\.NewApp\\(\\)', '(&cli.App{})', source, flags=re.UNICODE
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)
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@_migrator
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def _bash_complete(source):
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return re.sub(
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'BashComplete:', 'ShellComplete:',
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re.sub('\\.BashComplete', '.ShellComplete', source, flags=re.UNICODE))
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@_migrator
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def _enable_bash_completion(source):
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return re.sub(
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'\\.EnableBashCompletion', '.EnableShellCompletion', source, flags=re.UNICODE
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)
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@_migrator
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def _bash_completion_flag(source):
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return re.sub(
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'cli\\.BashCompletionFlag', 'cli.GenerateCompletionFlag', source, flags=re.UNICODE
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)
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def test_migrators():
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import difflib
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for i, (source, expected) in enumerate(_MIGRATOR_TESTS):
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actual = _update_source(source)
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if expected != actual:
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udiff = difflib.unified_diff(
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expected.splitlines(), actual.splitlines(),
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fromfile='a/source.go', tofile='b/source.go', lineterm=''
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)
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for line in udiff:
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print(line)
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raise AssertionError('migrated source does not match expected')
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logging.warn('Test case %d/%d OK', i+1, len(_MIGRATOR_TESTS))
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_MIGRATOR_TESTS = (
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("""
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\t\t\t&cli.StringSlice{"a", "b", "c"},
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""", """
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\t\t\tcli.NewStringSlice("a", "b", "c"),
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"""),
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("""
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\t\tcli.IntFlag{
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\t\t\tName: "yep",
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\t\t\tValue: 3,
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\t\t}
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""", """
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\t\t&cli.IntFlag{
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\t\t\tName: "yep",
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\t\t\tValue: 3,
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\t\t}
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"""),
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("""
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\t\tapp.Commands = []cli.Command{
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\t\t\t{
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\t\t\t\tName: "whatebbs",
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\t\t\t},
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\t\t}
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""", """
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\t\tapp.Commands = []*cli.Command{
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\t\t\t{
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\t\t\t\tName: "whatebbs",
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\t\t\t},
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\t\t}
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"""),
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("""
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\t\tapp.Commands = []cli.Command{
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\t\t\tcli.Command{
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\t\t\t\tName: "whatebbs",
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\t\t\t},
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\t\t}
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""", """
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\t\tapp.Commands = []*cli.Command{
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\t\t\t&cli.Command{
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\t\t\t\tName: "whatebbs",
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\t\t\t},
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\t\t}
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"""),
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("""
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\t"github.com/codegangsta/cli"
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\t"github.com/urfave/cli"
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\t"gopkg.in/codegangsta/cli"
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\t"gopkg.in/codegangsta/cli.v1"
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\t"gopkg.in/urfave/cli"
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\t"gopkg.in/urfave/cli.v1"
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""", """
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\t"gopkg.in/urfave/cli.v2"
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\t"gopkg.in/urfave/cli.v2"
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\t"gopkg.in/urfave/cli.v2"
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\t"gopkg.in/urfave/cli.v2"
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\t"gopkg.in/urfave/cli.v2"
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\t"gopkg.in/urfave/cli.v2"
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"""),
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("""
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\t\t\t\treturn cli.NewExitError("foo whatebber", 9)
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""", """
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\t\t\t\treturn cli.Exit("foo whatebber", 9)
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"""),
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("""
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\t\t\tapp.Flags = []cli.Flag{
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\t\t\t\tcli.StringFlag{
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\t\t\t\t\tName: "aha",
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\t\t\t\t},
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\t\t\t\tcli.BoolTFlag{
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\t\t\t\t\tName: "blurp",
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\t\t\t\t},
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\t\t\t}
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""", """
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\t\t\tapp.Flags = []cli.Flag{
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\t\t\t\t&cli.StringFlag{
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\t\t\t\t\tName: "aha",
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\t\t\t\t},
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\t\t\t\t&cli.BoolFlag{Value: true,
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\t\t\t\t\tName: "blurp",
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\t\t\t\t},
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\t\t\t}
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"""),
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("""
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\t\t\tAction = func(c *cli.Context) error {
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\t\t\t\tif c.Args()[4] == "meep" {
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\t\t\t\t\treturn nil
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\t\t\t\t}
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\t\t\t\treturn errors.New("mope")
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\t\t\t}
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""", """
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\t\t\tAction = func(c *cli.Context) error {
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\t\t\t\tif c.Args().Get(4) == "meep" {
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\t\t\t\t\treturn nil
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\t\t\t\t}
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\t\t\t\treturn errors.New("mope")
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\t\t\t}
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"""),
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("""
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\t\tapp.Flags = []cli.Flag{
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\t\t\tcli.StringFlag{
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\t\t\t\tName: "toots",
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\t\t\t\tEnvVar: "TOOTS,TOOTERS",
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\t\t\t},
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\t\t}
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""", """
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\t\tapp.Flags = []cli.Flag{
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\t\t\t&cli.StringFlag{
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\t\t\t\tName: "toots",
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\t\t\t\tEnvVars: []string{"TOOTS", "TOOTERS"},
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\t\t\t},
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\t\t}
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"""),
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("""
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\t\tapp.Flags = []cli.Flag{
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\t\t\tcli.StringFlag{
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\t\t\t\tName: "t, tootles, toots",
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\t\t\t},
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\t\t}
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""", """
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\t\tapp.Flags = []cli.Flag{
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\t\t\t&cli.StringFlag{
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\t\t\t\tName: "tootles", Aliases: []string{"toots", "t"},
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\t\t\t},
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\t\t}
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"""),
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("""
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\t\tapp := cli.NewApp()
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\t\tapp.HideHelp = true
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""", """
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\t\tapp := (&cli.App{})
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\t\tapp.HideHelp = true
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""")
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)
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if __name__ == '__main__':
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sys.exit(main())
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