init

.venv/lib/python3.8/site-packages/pyflyby/_cmdline.py

@@ -0,0 +1,515 @@
+# pyflyby/_cmdline.py.
+# Copyright (C) 2011, 2012, 2013, 2014, 2015, 2018 Karl Chen.
+# License: MIT http://opensource.org/licenses/MIT
+
+from __future__ import (absolute_import, division, print_function,
+                        with_statement)
+
+import optparse
+import os
+import signal
+import six
+from   six                      import reraise
+from   six.moves                import input
+import sys
+from   textwrap                 import dedent
+import traceback
+
+
+from   pyflyby._file            import (FileText, Filename, atomic_write_file,
+                                        expand_py_files_from_args, read_file)
+from   pyflyby._importstmt      import ImportFormatParams
+from   pyflyby._log             import logger
+from   pyflyby._util            import cached_attribute, indent
+
+
+def hfmt(s):
+    return dedent(s).strip()
+
+def maindoc():
+    import __main__
+    return (__main__.__doc__ or '').strip()
+
+
+def _sigpipe_handler(*args):
+    # The parent process piped our stdout and closed the pipe before we
+    # finished writing, e.g. "tidy-imports ... | head" or "tidy-imports ... |
+    # less".  Exit quietly - squelch the "close failed in file object
+    # destructor" message would otherwise be raised.
+    raise SystemExit(1)
+
+
+def parse_args(addopts=None, import_format_params=False, modify_action_params=False):
+    """
+    Do setup for a top-level script and parse arguments.
+    """
+    ### Setup.
+    # Register a SIGPIPE handler.
+    signal.signal(signal.SIGPIPE, _sigpipe_handler)
+    ### Parse args.
+    parser = optparse.OptionParser(usage='\n'+maindoc())
+
+    def log_level_callbacker(level):
+        def callback(option, opt_str, value, parser):
+            logger.set_level(level)
+        return callback
+
+    def debug_callback(option, opt_str, value, parser):
+        logger.set_level("DEBUG")
+
+    parser.add_option("--debug", action="callback",
+                      callback=debug_callback,
+                      help="Debug mode (noisy and fail fast).")
+
+    parser.add_option("--verbose", action="callback",
+                      callback=log_level_callbacker("DEBUG"),
+                      help="Be noisy.")
+
+    parser.add_option("--quiet", action="callback",
+                      callback=log_level_callbacker("ERROR"),
+                      help="Be quiet.")
+
+    parser.add_option("--version", action="callback",
+                      callback=lambda *args: print_version_and_exit(),
+                      help="Print pyflyby version and exit.")
+
+    if modify_action_params:
+        group = optparse.OptionGroup(parser, "Action options")
+        action_diff = action_external_command('pyflyby-diff')
+        def parse_action(v):
+            V = v.strip().upper()
+            if V == 'PRINT':
+                return action_print
+            elif V == 'REPLACE':
+                return action_replace
+            elif V == 'QUERY':
+                return action_query()
+            elif V == "DIFF":
+                return action_diff
+            elif V.startswith("QUERY:"):
+                return action_query(v[6:])
+            elif V.startswith("EXECUTE:"):
+                return action_external_command(v[8:])
+            elif V == "IFCHANGED":
+                return action_ifchanged
+            else:
+                raise Exception(
+                    "Bad argument %r to --action; "
+                    "expected PRINT or REPLACE or QUERY or IFCHANGED "
+                    "or EXECUTE:..." % (v,))
+
+        def set_actions(actions):
+            actions = tuple(actions)
+            parser.values.actions = actions
+
+        def action_callback(option, opt_str, value, parser):
+            action_args = value.split(',')
+            set_actions([parse_action(v) for v in action_args])
+
+        def action_callbacker(actions):
+            def callback(option, opt_str, value, parser):
+                set_actions(actions)
+            return callback
+
+        group.add_option(
+            "--actions", type='string', action='callback',
+            callback=action_callback,
+            metavar='PRINT|REPLACE|IFCHANGED|QUERY|DIFF|EXECUTE:mycommand',
+            help=hfmt('''
+                   Comma-separated list of action(s) to take.  If PRINT, print
+                   the changed file to stdout.  If REPLACE, then modify the
+                   file in-place.  If EXECUTE:mycommand, then execute
+                   'mycommand oldfile tmpfile'.  If DIFF, then execute
+                   'pyflyby-diff'.  If QUERY, then query user to continue.
+                   If IFCHANGED, then continue actions only if file was
+                   changed.'''))
+        group.add_option(
+            "--print", "-p", action='callback',
+            callback=action_callbacker([action_print]),
+            help=hfmt('''
+                Equivalent to --action=PRINT (default when stdin or stdout is
+                not a tty) '''))
+        group.add_option(
+            "--diff", "-d", action='callback',
+            callback=action_callbacker([action_diff]),
+            help=hfmt('''Equivalent to --action=DIFF'''))
+        group.add_option(
+            "--replace", "-r", action='callback',
+            callback=action_callbacker([action_ifchanged, action_replace]),
+            help=hfmt('''Equivalent to --action=IFCHANGED,REPLACE'''))
+        group.add_option(
+            "--diff-replace", "-R", action='callback',
+            callback=action_callbacker([action_ifchanged, action_diff, action_replace]),
+            help=hfmt('''Equivalent to --action=IFCHANGED,DIFF,REPLACE'''))
+        actions_interactive = [
+            action_ifchanged, action_diff,
+            action_query("Replace {filename}?"), action_replace]
+        group.add_option(
+            "--interactive", "-i", action='callback',
+            callback=action_callbacker(actions_interactive),
+            help=hfmt('''
+               Equivalent to --action=IFCHANGED,DIFF,QUERY,REPLACE (default
+               when stdin & stdout are ttys) '''))
+        if os.isatty(0) and os.isatty(1):
+            default_actions = actions_interactive
+        else:
+            default_actions = [action_print]
+        parser.set_default('actions', tuple(default_actions))
+        parser.add_option_group(group)
+
+        parser.add_option(
+            '--symlinks', action='callback', nargs=1, type=str,
+            dest='symlinks', callback=symlink_callback, help="--symlinks should be one of: " + symlinks_help,
+        )
+        parser.set_defaults(symlinks='error')
+
+    if import_format_params:
+        group = optparse.OptionGroup(parser, "Pretty-printing options")
+        group.add_option('--align-imports', '--align', type='str', default="32",
+                         metavar='N',
+                         help=hfmt('''
+                             Whether and how to align the 'import' keyword in
+                             'from modulename import aliases...'.  If 0, then
+                             don't align.  If 1, then align within each block
+                             of imports.  If an integer > 1, then align at
+                             that column, wrapping with a backslash if
+                             necessary.  If a comma-separated list of integers
+                             (tab stops), then pick the column that results in
+                             the fewest number of lines total per block.'''))
+        group.add_option('--from-spaces', type='int', default=3, metavar='N',
+                         help=hfmt('''
+                             The number of spaces after the 'from' keyword.
+                             (Must be at least 1; default is 3.)'''))
+        group.add_option('--separate-from-imports', action='store_true',
+                         default=False,
+                         help=hfmt('''
+                             Separate 'from ... import ...'
+                             statements from 'import ...' statements.'''))
+        group.add_option('--no-separate-from-imports', action='store_false',
+                         dest='separate_from_imports',
+                         help=hfmt('''
+                            (Default) Don't separate 'from ... import ...'
+                            statements from 'import ...' statements.'''))
+        group.add_option('--align-future', action='store_true',
+                         default=False,
+                         help=hfmt('''
+                             Align the 'from __future__ import ...' statement
+                             like others.'''))
+        group.add_option('--no-align-future', action='store_false',
+                         dest='align_future',
+                         help=hfmt('''
+                             (Default) Don't align the 'from __future__ import
+                             ...' statement.'''))
+        group.add_option('--width', type='int', default=79, metavar='N',
+                         help=hfmt('''
+                             Maximum line length (default: 79).'''))
+        group.add_option('--black', action='store_true', default=False,
+                         help=hfmt('''
+                             Use black to format imports. If this option is
+                             used, all other formatting options are ignored.'''))
+        group.add_option('--hanging-indent', type='choice', default='never',
+                         choices=['never','auto','always'],
+                         metavar='never|auto|always',
+                         dest='hanging_indent',
+                         help=hfmt('''
+                             How to wrap import statements that don't fit on
+                             one line.
+                             If --hanging-indent=always, then always indent
+                             imported tokens at column 4 on the next line.
+                             If --hanging-indent=never (default), then align
+                             import tokens after "import (" (by default column
+                             40); do so even if some symbols are so long that
+                             this would exceed the width (by default 79)).
+                             If --hanging-indent=auto, then use hanging indent
+                             only if it is necessary to prevent exceeding the
+                             width (by default 79).
+                         '''))
+        def uniform_callback(option, opt_str, value, parser):
+            parser.values.separate_from_imports = False
+            parser.values.from_spaces           = 3
+            parser.values.align_imports         = '32'
+        group.add_option('--uniform', '-u', action="callback",
+                         callback=uniform_callback,
+                         help=hfmt('''
+                             (Default) Shortcut for --no-separate-from-imports
+                             --from-spaces=3 --align-imports=32.'''))
+        def unaligned_callback(option, opt_str, value, parser):
+            parser.values.separate_from_imports = True
+            parser.values.from_spaces           = 1
+            parser.values.align_imports         = '0'
+        group.add_option('--unaligned', '-n', action="callback",
+                         callback=unaligned_callback,
+                         help=hfmt('''
+                             Shortcut for --separate-from-imports
+                             --from-spaces=1 --align-imports=0.'''))
+
+        parser.add_option_group(group)
+    if addopts is not None:
+        addopts(parser)
+    # This is the only way to provide a default value for an option with a
+    # callback.
+    if modify_action_params:
+        args = ["--symlinks=error"] + sys.argv[1:]
+    else:
+        args = None
+    options, args = parser.parse_args(args=args)
+    if import_format_params:
+        align_imports_args = [int(x.strip())
+                              for x in options.align_imports.split(",")]
+        if len(align_imports_args) == 1 and align_imports_args[0] == 1:
+            align_imports = True
+        elif len(align_imports_args) == 1 and align_imports_args[0] == 0:
+            align_imports = False
+        else:
+            align_imports = tuple(sorted(set(align_imports_args)))
+        options.params = ImportFormatParams(
+            align_imports         =align_imports,
+            from_spaces           =options.from_spaces,
+            separate_from_imports =options.separate_from_imports,
+            max_line_length       =options.width,
+            use_black             =options.black,
+            align_future          =options.align_future,
+            hanging_indent        =options.hanging_indent,
+            )
+    return options, args
+
+
+def _default_on_error(filename):
+    raise SystemExit("bad filename %s" % (filename,))
+
+def filename_args(args, on_error=_default_on_error):
+    """
+    Return list of filenames given command-line arguments.
+
+    :rtype:
+      ``list`` of `Filename`
+    """
+    if args:
+        return expand_py_files_from_args(args, on_error)
+    elif not os.isatty(0):
+        return [Filename.STDIN]
+    else:
+        syntax()
+
+
+def print_version_and_exit(extra=None):
+    from pyflyby._version import __version__
+    msg = "pyflyby %s" % (__version__,)
+    progname = os.path.realpath(sys.argv[0])
+    if os.path.exists(progname):
+        msg += " (%s)" % (os.path.basename(progname),)
+    print(msg)
+    if extra:
+        print(extra)
+    raise SystemExit(0)
+
+
+def syntax(message=None, usage=None):
+    if message:
+        logger.error(message)
+    outmsg = ((usage or maindoc()) +
+              '\n\nFor usage, see: %s --help' % (sys.argv[0],))
+    print(outmsg, file=sys.stderr)
+    raise SystemExit(1)
+
+
+class AbortActions(Exception):
+    pass
+
+
+class Modifier(object):
+    def __init__(self, modifier, filename):
+        self.modifier = modifier
+        self.filename = filename
+        self._tmpfiles = []
+
+    @cached_attribute
+    def input_content(self):
+        return read_file(self.filename)
+
+    # TODO: refactor to avoid having these heavy-weight things inside a
+    # cached_attribute, which causes annoyance while debugging.
+    @cached_attribute
+    def output_content(self):
+        return FileText(self.modifier(self.input_content), filename=self.filename)
+
+    def _tempfile(self):
+        from tempfile import NamedTemporaryFile
+        f = NamedTemporaryFile()
+        self._tmpfiles.append(f)
+        return f, Filename(f.name)
+
+
+    @cached_attribute
+    def output_content_filename(self):
+        f, fname = self._tempfile()
+        if six.PY3:
+            f.write(bytes(self.output_content.joined, "utf-8"))
+        else:
+            f.write(self.output_content.joined.encode('utf-8'))
+        f.flush()
+        return fname
+
+    @cached_attribute
+    def input_content_filename(self):
+        if isinstance(self.filename, Filename):
+            return self.filename
+        # If the input was stdin, and the user wants a diff, then we need to
+        # write it to a temp file.
+        f, fname = self._tempfile()
+        if six.PY3:
+            f.write(bytes(self.input_content, "utf-8"))
+        else:
+            f.write(self.input_content)
+        f.flush()
+        return fname
+
+
+    def __del__(self):
+        for f in self._tmpfiles:
+            f.close()
+
+
+def process_actions(filenames, actions, modify_function,
+                    reraise_exceptions=()):
+    errors = []
+    def on_error_filename_arg(arg):
+        print("%s: bad filename %s" % (sys.argv[0], arg), file=sys.stderr)
+        errors.append("%s: bad filename" % (arg,))
+    filenames = filename_args(filenames, on_error=on_error_filename_arg)
+    for filename in filenames:
+        try:
+            m = Modifier(modify_function, filename)
+            for action in actions:
+                action(m)
+        except AbortActions:
+            continue
+        except reraise_exceptions:
+            raise
+        except Exception as e:
+            errors.append("%s: %s: %s" % (filename, type(e).__name__, e))
+            type_e = type(e)
+            try:
+                tb = sys.exc_info()[2]
+                if str(filename) not in str(e):
+                    try:
+                        e = type_e("While processing %s: %s" % (filename, e))
+                        pass
+                    except TypeError:
+                        # Exception takes more than one argument
+                        pass
+                if logger.debug_enabled:
+                    reraise(type_e, e, tb)
+                traceback.print_exception(type(e), e, tb)
+            finally:
+                tb = None # avoid refcycles involving tb
+            continue
+    if errors:
+        msg = "\n%s: encountered the following problems:\n" % (sys.argv[0],)
+        for e in errors:
+            lines = e.splitlines()
+            msg += "    " + lines[0] + '\n'.join(
+                ("            %s"%line for line in lines[1:]))
+        raise SystemExit(msg)
+
+
+def action_print(m):
+    output_content = m.output_content
+    sys.stdout.write(output_content.joined)
+
+
+def action_ifchanged(m):
+    if m.output_content.joined == m.input_content.joined:
+        logger.debug("unmodified: %s", m.filename)
+        raise AbortActions
+
+
+def action_replace(m):
+    if m.filename == Filename.STDIN:
+        raise Exception("Can't replace stdio in-place")
+    logger.info("%s: *** modified ***", m.filename)
+    atomic_write_file(m.filename, m.output_content)
+
+
+def action_external_command(command):
+    import subprocess
+    def action(m):
+        bindir = os.path.dirname(os.path.realpath(sys.argv[0]))
+        env = os.environ
+        env['PATH'] = env['PATH'] + ":" + bindir
+        fullcmd = "%s %s %s" % (
+            command, m.input_content_filename, m.output_content_filename)
+        logger.debug("Executing external command: %s", fullcmd)
+        ret = subprocess.call(fullcmd, shell=True, env=env)
+        logger.debug("External command returned %d", ret)
+    return action
+
+
+def action_query(prompt="Proceed?"):
+    def action(m):
+        p = prompt.format(filename=m.filename)
+        print()
+        print("%s [y/N] " % (p), end="")
+        try:
+            if input().strip().lower().startswith('y'):
+                return True
+        except KeyboardInterrupt:
+            print("KeyboardInterrupt", file=sys.stderr)
+            raise SystemExit(1)
+        print("Aborted")
+        raise AbortActions
+    return action
+
+def symlink_callback(option, opt_str, value, parser):
+    parser.values.actions = tuple(i for i in parser.values.actions if i not in
+    symlink_callbacks.values())
+    if value in symlink_callbacks:
+        parser.values.actions = (symlink_callbacks[value],) + parser.values.actions
+    else:
+        raise optparse.OptionValueError("--symlinks must be one of 'error', 'follow', 'skip', or 'replace'. Got %r" % value)
+
+symlinks_help = """\
+--symlinks=error (default; gives an error on symlinks),
+--symlinks=follow (follows symlinks),
+--symlinks=skip (skips symlinks),
+--symlinks=replace (replaces symlinks with the target file\
+"""
+
+# Warning, the symlink actions will only work if they are run first.
+# Otherwise, output_content may already be cached
+def symlink_error(m):
+    if m.filename == Filename.STDIN:
+        return symlink_follow(m)
+    if m.filename.islink:
+        raise SystemExit("""\
+Error: %s appears to be a symlink. Use one of the following options to allow symlinks:
+%s
+""" % (m.filename, indent(symlinks_help, '    ')))
+
+def symlink_follow(m):
+    if m.filename == Filename.STDIN:
+        return
+    if m.filename.islink:
+        logger.info("Following symlink %s" % m.filename)
+        m.filename = m.filename.realpath
+
+def symlink_skip(m):
+    if m.filename == Filename.STDIN:
+        return symlink_follow(m)
+    if m.filename.islink:
+        logger.info("Skipping symlink %s" % m.filename)
+        raise AbortActions
+
+def symlink_replace(m):
+    if m.filename == Filename.STDIN:
+        return symlink_follow(m)
+    if m.filename.islink:
+        logger.info("Replacing symlink %s" % m.filename)
+        # The current behavior automatically replaces symlinks, so do nothing
+
+symlink_callbacks = {
+    'error': symlink_error,
+    'follow': symlink_follow,
+    'skip': symlink_skip,
+    'replace': symlink_replace,
+}