"""distutils.cmd Provides the Command class, the base class for the command classes in the distutils.command package. """ import sys, os, re from distutils.errors import DistutilsOptionError from distutils import util, dir_util, file_util, archive_util, dep_util from distutils import log class Command: """Abstract base class for defining command classes, the "worker bees" of the Distutils. A useful analogy for command classes is to think of them as subroutines with local variables called "options". The options are "declared" in 'initialize_options()' and "defined" (given their final values, aka "finalized") in 'finalize_options()', both of which must be defined by every command class. The distinction between the two is necessary because option values might come from the outside world (command line, config file, ...), and any options dependent on other options must be computed *after* these outside influences have been processed -- hence 'finalize_options()'. The "body" of the subroutine, where it does all its work based on the values of its options, is the 'run()' method, which must also be implemented by every command class. """ # 'sub_commands' formalizes the notion of a "family" of commands, # eg. "install" as the parent with sub-commands "install_lib", # "install_headers", etc. The parent of a family of commands # defines 'sub_commands' as a class attribute; it's a list of # (command_name : string, predicate : unbound_method | string | None) # tuples, where 'predicate' is a method of the parent command that # determines whether the corresponding command is applicable in the # current situation. (Eg. we "install_headers" is only applicable if # we have any C header files to install.) If 'predicate' is None, # that command is always applicable. # # 'sub_commands' is usually defined at the *end* of a class, because # predicates can be unbound methods, so they must already have been # defined. The canonical example is the "install" command. sub_commands = [] # -- Creation/initialization methods ------------------------------- def __init__(self, dist): """Create and initialize a new Command object. Most importantly, invokes the 'initialize_options()' method, which is the real initializer and depends on the actual command being instantiated. """ # late import because of mutual dependence between these classes from distutils.dist import Distribution if not isinstance(dist, Distribution): raise TypeError("dist must be a Distribution instance") if self.__class__ is Command: raise RuntimeError("Command is an abstract class") self.distribution = dist self.initialize_options() # Per-command versions of the global flags, so that the user can # customize Distutils' behaviour command-by-command and let some # commands fall back on the Distribution's behaviour. None means # "not defined, check self.distribution's copy", while 0 or 1 mean # false and true (duh). Note that this means figuring out the real # value of each flag is a touch complicated -- hence "self._dry_run" # will be handled by __getattr__, below. # XXX This needs to be fixed. self._dry_run = None # verbose is largely ignored, but needs to be set for # backwards compatibility (I think)? self.verbose = dist.verbose # Some commands define a 'self.force' option to ignore file # timestamps, but methods defined *here* assume that # 'self.force' exists for all commands. So define it here # just to be safe. self.force = None # The 'help' flag is just used for command-line parsing, so # none of that complicated bureaucracy is needed. self.help = 0 # 'finalized' records whether or not 'finalize_options()' has been # called. 'finalize_options()' itself should not pay attention to # this flag: it is the business of 'ensure_finalized()', which # always calls 'finalize_options()', to respect/update it. self.finalized = 0 # XXX A more explicit way to customize dry_run would be better. def __getattr__(self, attr): if attr == 'dry_run': myval = getattr(self, "_" + attr) if myval is None: return getattr(self.distribution, attr) else: return myval else: raise AttributeError(attr) def ensure_finalized(self): if not self.finalized: self.finalize_options() self.finalized = 1 # Subclasses must define: # initialize_options() # provide default values for all options; may be customized by # setup script, by options from config file(s), or by command-line # options # finalize_options() # decide on the final values for all options; this is called # after all possible intervention from the outside world # (command-line, option file, etc.) has been processed # run() # run the command: do whatever it is we're here to do, # controlled by the command's various option values def initialize_options(self): """Set default values for all the options that this command supports. Note that these defaults may be overridden by other commands, by the setup script, by config files, or by the command-line. Thus, this is not the place to code dependencies between options; generally, 'initialize_options()' implementations are just a bunch of "self.foo = None" assignments. This method must be implemented by all command classes. """ raise RuntimeError("abstract method -- subclass %s must override" % self.__class__) def finalize_options(self): """Set final values for all the options that this command supports. This is always called as late as possible, ie. after any option assignments from the command-line or from other commands have been done. Thus, this is the place to code option dependencies: if 'foo' depends on 'bar', then it is safe to set 'foo' from 'bar' as long as 'foo' still has the same value it was assigned in 'initialize_options()'. This method must be implemented by all command classes. """ raise RuntimeError("abstract method -- subclass %s must override" % self.__class__) def dump_options(self, header=None, indent=""): from distutils.fancy_getopt import longopt_xlate if header is None: header = "command options for '%s':" % self.get_command_name() self.announce(indent + header, level=log.INFO) indent = indent + " " for (option, _, _) in self.user_options: option = option.translate(longopt_xlate) if option[-1] == "=": option = option[:-1] value = getattr(self, option) self.announce(indent + "%s = %s" % (option, value), level=log.INFO) def run(self): """A command's raison d'etre: carry out the action it exists to perform, controlled by the options initialized in 'initialize_options()', customized by other commands, the setup script, the command-line, and config files, and finalized in 'finalize_options()'. All terminal output and filesystem interaction should be done by 'run()'. This method must be implemented by all command classes. """ raise RuntimeError("abstract method -- subclass %s must override" % self.__class__) def announce(self, msg, level=1): """If the current verbosity level is of greater than or equal to 'level' print 'msg' to stdout. """ log.log(level, msg) def debug_print(self, msg): """Print 'msg' to stdout if the global DEBUG (taken from the DISTUTILS_DEBUG environment variable) flag is true. """ from distutils.debug import DEBUG if DEBUG: print(msg) sys.stdout.flush() # -- Option validation methods ------------------------------------- # (these are very handy in writing the 'finalize_options()' method) # # NB. the general philosophy here is to ensure that a particular option # value meets certain type and value constraints. If not, we try to # force it into conformance (eg. if we expect a list but have a string, # split the string on comma and/or whitespace). If we can't force the # option into conformance, raise DistutilsOptionError. Thus, command # classes need do nothing more than (eg.) # self.ensure_string_list('foo') # and they can be guaranteed that thereafter, self.foo will be # a list of strings. def _ensure_stringlike(self, option, what, default=None): val = getattr(self, option) if val is None: setattr(self, option, default) return default elif not isinstance(val, str): raise DistutilsOptionError("'%s' must be a %s (got `%s`)" % (option, what, val)) return val def ensure_string(self, option, default=None): """Ensure that 'option' is a string; if not defined, set it to 'default'. """ self._ensure_stringlike(option, "string", default) def ensure_string_list(self, option): r"""Ensure that 'option' is a list of strings. If 'option' is currently a string, we split it either on /,\s*/ or /\s+/, so "foo bar baz", "foo,bar,baz", and "foo, bar baz" all become ["foo", "bar", "baz"]. """ val = getattr(self, option) if val is None: return elif isinstance(val, str): setattr(self, option, re.split(r',\s*|\s+', val)) else: if isinstance(val, list): ok = all(isinstance(v, str) for v in val) else: ok = False if not ok: raise DistutilsOptionError( "'%s' must be a list of strings (got %r)" % (option, val)) def _ensure_tested_string(self, option, tester, what, error_fmt, default=None): val = self._ensure_stringlike(option, what, default) if val is not None and not tester(val): raise DistutilsOptionError(("error in '%s' option: " + error_fmt) % (option, val)) def ensure_filename(self, option): """Ensure that 'option' is the name of an existing file.""" self._ensure_tested_string(option, os.path.isfile, "filename", "'%s' does not exist or is not a file") def ensure_dirname(self, option): self._ensure_tested_string(option, os.path.isdir, "directory name", "'%s' does not exist or is not a directory") # -- Convenience methods for commands ------------------------------ def get_command_name(self): if hasattr(self, 'command_name'): return self.command_name else: return self.__class__.__name__ def set_undefined_options(self, src_cmd, *option_pairs): """Set the values of any "undefined" options from corresponding option values in some other command object. "Undefined" here means "is None", which is the convention used to indicate that an option has not been changed between 'initialize_options()' and 'finalize_options()'. Usually called from 'finalize_options()' for options that depend on some other command rather than another option of the same command. 'src_cmd' is the other command from which option values will be taken (a command object will be created for it if necessary); the remaining arguments are '(src_option,dst_option)' tuples which mean "take the value of 'src_option' in the 'src_cmd' command object, and copy it to 'dst_option' in the current command object". """ # Option_pairs: list of (src_option, dst_option) tuples src_cmd_obj = self.distribution.get_command_obj(src_cmd) src_cmd_obj.ensure_finalized() for (src_option, dst_option) in option_pairs: if getattr(self, dst_option) is None: setattr(self, dst_option, getattr(src_cmd_obj, src_option)) def get_finalized_command(self, command, create=1): """Wrapper around Distribution's 'get_command_obj()' method: find (create if necessary and 'create' is true) the command object for 'command', call its 'ensure_finalized()' method, and return the finalized command object. """ cmd_obj = self.distribution.get_command_obj(command, create) cmd_obj.ensure_finalized() return cmd_obj # XXX rename to 'get_reinitialized_command()'? (should do the # same in dist.py, if so) def reinitialize_command(self, command, reinit_subcommands=0): return self.distribution.reinitialize_command(command, reinit_subcommands) def run_command(self, command): """Run some other command: uses the 'run_command()' method of Distribution, which creates and finalizes the command object if necessary and then invokes its 'run()' method. """ self.distribution.run_command(command) def get_sub_commands(self): """Determine the sub-commands that are relevant in the current distribution (ie., that need to be run). This is based on the 'sub_commands' class attribute: each tuple in that list may include a method that we call to determine if the subcommand needs to be run for the current distribution. Return a list of command names. """ commands = [] for (cmd_name, method) in self.sub_commands: if method is None or method(self): commands.append(cmd_name) return commands # -- External world manipulation ----------------------------------- def warn(self, msg): log.warn("warning: %s: %s\n", self.get_command_name(), msg) def execute(self, func, args, msg=None, level=1): util.execute(func, args, msg, dry_run=self.dry_run) def mkpath(self, name, mode=0o777): dir_util.mkpath(name, mode, dry_run=self.dry_run) def copy_file(self, infile, outfile, preserve_mode=1, preserve_times=1, link=None, level=1): """Copy a file respecting verbose, dry-run and force flags. (The former two default to whatever is in the Distribution object, and the latter defaults to false for commands that don't define it.)""" return file_util.copy_file(infile, outfile, preserve_mode, preserve_times, not self.force, link, dry_run=self.dry_run) def copy_tree(self, infile, outfile, preserve_mode=1, preserve_times=1, preserve_symlinks=0, level=1): """Copy an entire directory tree respecting verbose, dry-run, and force flags. """ return dir_util.copy_tree(infile, outfile, preserve_mode, preserve_times, preserve_symlinks, not self.force, dry_run=self.dry_run) def move_file (self, src, dst, level=1): """Move a file respecting dry-run flag.""" return file_util.move_file(src, dst, dry_run=self.dry_run) def spawn(self, cmd, search_path=1, level=1): """Spawn an external command respecting dry-run flag.""" from distutils.spawn import spawn spawn(cmd, search_path, dry_run=self.dry_run) def make_archive(self, base_name, format, root_dir=None, base_dir=None, owner=None, group=None): return archive_util.make_archive(base_name, format, root_dir, base_dir, dry_run=self.dry_run, owner=owner, group=group) def make_file(self, infiles, outfile, func, args, exec_msg=None, skip_msg=None, level=1): """Special case of 'execute()' for operations that process one or more input files and generate one output file. Works just like 'execute()', except the operation is skipped and a different message printed if 'outfile' already exists and is newer than all files listed in 'infiles'. If the command defined 'self.force', and it is true, then the command is unconditionally run -- does no timestamp checks. """ if skip_msg is None: skip_msg = "skipping %s (inputs unchanged)" % outfile # Allow 'infiles' to be a single string if isinstance(infiles, str): infiles = (infiles,) elif not isinstance(infiles, (list, tuple)): raise TypeError( "'infiles' must be a string, or a list or tuple of strings") if exec_msg is None: exec_msg = "generating %s from %s" % (outfile, ', '.join(infiles)) # If 'outfile' must be regenerated (either because it doesn't # exist, is out-of-date, or the 'force' flag is true) then # perform the action that presumably regenerates it if self.force or dep_util.newer_group(infiles, outfile): self.execute(func, args, exec_msg, level) # Otherwise, print the "skip" message else: log.debug(skip_msg)


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Chiranjeevi has hidden a secret from his wife! - Telugu News - IndiaGlitz.com
Megastar Chiranjeevi has always called his wife Surekha as Rekha at home. If you thought it's innocuous, you are not alone. Even the naive Surekha has always seen it as her hubby's way of calling her in a cute way!
But 'Rekha' is a code, mind you!
As far as the legendary Chiru is concerned, Rekha denotes the Bollywood actress Rekha, whose big favourite the 'Sye Raa' actor has been. "I call my wife Surekha as Rekha. It's because Rekha garu is one of my favourite actors. My wife doesn't know this at all! I hope this part of the speech is edited out so that she doesn't get to know the long-kept secret," the Megastar recently said at the ANR Awards ceremony.
Describing her as an ageless beauty, Chiru said that Rekha's stunning beauty would distract the attention of MPs in Rajya Sabha on the rare occasion she would visit the Parliament.
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