"""distutils.core The only module that needs to be imported to use the Distutils; provides the 'setup' function (which must be called); the 'Distribution' class (which may be subclassed if additional functionality is desired), and the 'Command' class (which is used both internally by Distutils, and may be subclassed by clients for still more flexibility).""" # created 1999/03/01, Greg Ward __rcsid__ = "$Id$" import sys import string, re from distutils.errors import * from distutils.fancy_getopt import fancy_getopt # This is not *quite* the same as a Python NAME; I don't allow leading # underscores. The fact that they're very similar is no coincidence... command_re = re.compile (r'^[a-zA-Z]([a-zA-Z0-9_]*)$') # Defining this as a global is probably inadequate -- what about # listing the available options (or even commands, which can vary # quite late as well) usage = '%s [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]' % sys.argv[0] def setup (**attrs): """The gateway to the Distutils: do everything your setup script needs to do, in a highly flexible and user-driven way. Briefly: create a Distribution instance; parse the command-line, creating and customizing instances of the command class for each command found on the command-line; run each of those commands. The Distribution instance might be an instance of a class supplied via the 'distclass' keyword argument to 'setup'; if no such class is supplied, then the 'Distribution' class (also in this module) is instantiated. All other arguments to 'setup' (except for 'cmdclass') are used to set attributes of the Distribution instance. The 'cmdclass' argument, if supplied, is a dictionary mapping command names to command classes. Each command encountered on the command line will be turned into a command class, which is in turn instantiated; any class found in 'cmdclass' is used in place of the default, which is (for command 'foo_bar') class 'FooBar' in module 'distutils.command.foo_bar'. The command object must provide an 'options' attribute which is a list of option specifiers for 'distutils.fancy_getopt'. Any command-line options between the current and the next command are used to set attributes in the current command object. When the entire command-line has been successfully parsed, calls the 'run' method on each command object in turn. This method will be driven entirely by the Distribution object (which each command object has a reference to, thanks to its constructor), and the command-specific options that became attributes of each command object.""" # Determine the distribution class -- either caller-supplied or # our Distribution (see below). klass = attrs.get ('distclass') if klass: del attrs['distclass'] else: klass = Distribution # Create the Distribution instance, using the remaining arguments # (ie. everything except distclass) to initialize it dist = klass (attrs) # Get it to parse the command line; any command-line errors are # the end-users fault, so turn them into SystemExit to suppress # tracebacks. try: dist.parse_command_line (sys.argv[1:]) except DistutilsArgError, msg: raise SystemExit, msg # And finally, run all the commands found on the command line. dist.run_commands () # setup () class Distribution: """The core of the Distutils. Most of the work hiding behind 'setup' is really done within a Distribution instance, which farms the work out to the Distutils commands specified on the command line. Clients will almost never instantiate Distribution directly, unless the 'setup' function is totally inadequate to their needs. However, it is conceivable that a client might wish to subclass Distribution for some specialized purpose, and then pass the subclass to 'setup' as the 'distclass' keyword argument. If so, it is necessary to respect the expectations that 'setup' has of Distribution: it must have a constructor and methods 'parse_command_line()' and 'run_commands()' with signatures like those described below.""" # 'global_options' describes the command-line options that may # be supplied to the client (setup.py) prior to any actual # commands. Eg. "./setup.py -nv" or "./setup.py --verbose" # both take advantage of these global options. global_options = [('verbose', 'v', "run verbosely"), ('dry-run', 'n', "don't actually do anything"), ] # -- Creation/initialization methods ------------------------------- def __init__ (self, attrs=None): """Construct a new Distribution instance: initialize all the attributes of a Distribution, and then uses 'attrs' (a dictionary mapping attribute names to values) to assign some of those attributes their "real" values. (Any attributes not mentioned in 'attrs' will be assigned to some null value: 0, None, an empty list or dictionary, etc.) Most importantly, initialize the 'command_obj' attribute to the empty dictionary; this will be filled in with real command objects by 'parse_command_line()'.""" # Default values for our command-line options self.verbose = 0 self.dry_run = 0 # And for all other attributes (stuff that might be passed in # from setup.py, rather than from the end-user) self.name = None self.version = None self.author = None self.licence = None self.description = None self.cmdclass = {} # The rest of these are really the business of various commands, # rather than of the Distribution itself. However, they have # to be here as a conduit to the relevant command class. self.py_modules = None self.ext_modules = None self.package = None # Now we'll use the attrs dictionary to possibly override # any or all of these distribution options if attrs: for k in attrs.keys(): setattr (self, k, attrs[k]) # And now initialize bookkeeping stuff that can't be supplied by # the caller at all self.command_obj = {} # __init__ () def parse_command_line (self, args): """Parse the client's command line: set any Distribution attributes tied to command-line options, create all command objects, and set their options from the command-line. 'args' must be a list of command-line arguments, most likely 'sys.argv[1:]' (see the 'setup()' function). This list is first processed for "global options" -- options that set attributes of the Distribution instance. Then, it is alternately scanned for Distutils command and options for that command. Each new command terminates the options for the previous command. The allowed options for a command are determined by the 'options' attribute of the command object -- thus, we instantiate (and cache) every command object here, in order to access its 'options' attribute. Any error in that 'options' attribute raises DistutilsGetoptError; any error on the command-line raises DistutilsArgError. If no Distutils commands were found on the command line, raises DistutilsArgError.""" # We have to parse the command line a bit at a time -- global # options, then the first command, then its options, and so on -- # because each command will be handled by a different class, and # the options that are valid for a particular class aren't # known until we instantiate the command class, which doesn't # happen until we know what the command is. self.commands = [] args = fancy_getopt (self.global_options, self, sys.argv[1:]) while args: # Pull the current command from the head of the command line command = args[0] if not command_re.match (command): raise SystemExit, "invalid command name '%s'" % command self.commands.append (command) # Have to instantiate the command class now, so we have a # way to get its valid options and somewhere to put the # results of parsing its share of the command-line cmd_obj = self.create_command_obj (command) # Require that the command class be derived from Command -- # that way, we can be sure that we at least have the 'run' # and 'get_option' methods. if not isinstance (cmd_obj, Command): raise DistutilsClassError, \ "command class %s must subclass Command" % \ cmd_obj.__class__ # XXX this assumes that cmd_obj provides an 'options' # attribute, but we're not enforcing that anywhere! args = fancy_getopt (cmd_obj.options, cmd_obj, args[1:]) self.command_obj[command] = cmd_obj # while args # Oops, no commands found -- an end-user error if not self.commands: sys.stderr.write (usage + "\n") raise DistutilsArgError, "no commands supplied" # parse_command_line() # -- Command class/object methods ---------------------------------- # This is a method just so it can be overridden if desired; it doesn't # actually use or change any attributes of the Distribution instance. def find_command_class (self, command): """Given a command, derives the names of the module and class expected to implement the command: eg. 'foo_bar' becomes 'distutils.command.foo_bar' (the module) and 'FooBar' (the class within that module). Loads the module, extracts the class from it, and returns the class object. Raises DistutilsModuleError with a semi-user-targeted error message if the expected module could not be loaded, or the expected class was not found in it.""" module_name = 'distutils.command.' + command klass_name = string.join \ (map (string.capitalize, string.split (command, '_')), '') try: __import__ (module_name) module = sys.modules[module_name] except ImportError: raise DistutilsModuleError, \ "invalid command '%s' (no module named %s)" % \ (command, module_name) try: klass = vars(module)[klass_name] except KeyError: raise DistutilsModuleError, \ "invalid command '%s' (no class '%s' in module '%s')" \ % (command, klass_name, module_name) return klass # find_command_class () def create_command_obj (self, command): """Figure out the class that should implement a command, instantiate it, cache and return the new "command object". The "command class" is determined either by looking it up in the 'cmdclass' attribute (this is the mechanism whereby clients may override default Distutils commands or add their own), or by calling the 'find_command_class()' method (if the command name is not in 'cmdclass'.""" # Determine the command class -- either it's in the command_class # dictionary, or we have to divine the module and class name klass = self.cmdclass.get(command) if not klass: klass = self.find_command_class (command) self.cmdclass[command] = klass # Found the class OK -- instantiate it cmd_obj = klass (self) return cmd_obj def find_command_obj (self, command, create=1): """Look up and return a command object in the cache maintained by 'create_command_obj()'. If none found, the action taken depends on 'create': if true (the default), create a new command object by calling 'create_command_obj()' and return it; otherwise, return None.""" cmd_obj = self.command_obj.get (command) if not cmd_obj and create: cmd_obj = self.create_command_obj (command) self.command_obj[command] = cmd_obj return cmd_obj # -- Methods that operate on the Distribution ---------------------- def announce (self, msg, level=1): """Print 'msg' if 'level' is greater than or equal to the verbosity level recorded in the 'verbose' attribute (which, currently, can be only 0 or 1).""" if self.verbose >= level: print msg def run_commands (self): """Run each command that was seen on the client command line. Uses the list of commands found and cache of command objects created by 'create_command_obj()'.""" for cmd in self.commands: self.run_command (cmd) def get_option (self, option): """Return the value of a distribution option. Raise DistutilsOptionError if 'option' is not known.""" try: return getattr (self, opt) except AttributeError: raise DistutilsOptionError, \ "unknown distribution option %s" % option def get_options (self, *options): """Return (as a tuple) the values of several distribution options. Raise DistutilsOptionError if any element of 'options' is not known.""" values = [] try: for opt in options: values.append (getattr (self, opt)) except AttributeError, name: raise DistutilsOptionError, \ "unknown distribution option %s" % name return tuple (values) # -- Methods that operate on its Commands -------------------------- def run_command (self, command): """Create a command object for 'command' if necessary, and run the command by invoking its 'run()' method.""" self.announce ("running " + command) cmd_obj = self.find_command_obj (command) cmd_obj.run () def get_command_option (self, command, option): """Create a command object for 'command' if necessary, finalize its option values by invoking its 'set_final_options()' method, and return the value of its 'option' option. Raise DistutilsOptionError if 'option' is not known for that 'command'.""" cmd_obj = self.find_command_obj (command) cmd_obj.set_final_options () return cmd_obj.get_option (option) try: return getattr (cmd_obj, option) except AttributeError: raise DistutilsOptionError, \ "command %s: no such option %s" % (command, option) def get_command_options (self, command, *options): """Create a command object for 'command' if necessary, finalize its option values by invoking its 'set_final_options()' method, and return the values of all the options listed in 'options' for that command. Raise DistutilsOptionError if 'option' is not known for that 'command'.""" cmd_obj = self.find_command_obj (command) cmd_obj.set_final_options () values = [] try: for opt in options: values.append (getattr (cmd_obj, option)) except AttributeError, name: raise DistutilsOptionError, \ "command %s: no such option %s" % (command, name) return tuple (values) # end class Distribution 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 'set_initial_options()' and "initialized" (given their real values) in 'set_final_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, option file, ...), and any options dependent on other options must be computed *after* these outside influences have been processed -- hence 'set_final_values()'. 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.""" # -- Creation/initialization methods ------------------------------- def __init__ (self, dist): """Create and initialize a new Command object. Most importantly, invokes the 'set_default_options()' method, which is the real initializer and depends on the actual command being instantiated.""" 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.set_default_options () # end __init__ () # Subclasses must define: # set_default_options() # provide default values for all options; may be overridden # by Distutils client, by command-line options, or by options # from option file # set_final_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 set_default_options (self): """Set default values for all the options that this command supports. Note that these defaults may be overridden by the command-line supplied by the user; thus, this is not the place to code dependencies between options; generally, 'set_default_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 set_final_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 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 'set_default_options()'. This method must be implemented by all command classes.""" raise RuntimeError, \ "abstract method -- subclass %s must override" % self.__class__ def run (self): """A command's raison d'etre: carry out the action it exists to perform, controlled by the options initialized in 'set_initial_options()', customized by the user and other commands, and finalized in 'set_final_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 Distribution instance to which this command belongs has a verbosity level of greater than or equal to 'level' print 'msg' to stdout.""" if self.distribution.verbose >= level: print msg # -- Option query/set methods -------------------------------------- def get_option (self, option): """Return the value of a single option for this command. Raise DistutilsOptionError if 'option' is not known.""" try: return getattr (self, option) except AttributeError: raise DistutilsOptionError, \ "command %s: no such option %s" % \ (self.command_name(), option) def get_options (self, *options): """Return (as a tuple) the values of several options for this command. Raise DistutilsOptionError if any of the options in 'options' are not known.""" values = [] try: for opt in options: values.append (getattr (self, opt)) except AttributeError, name: raise DistutilsOptionError, \ "command %s: no such option %s" % \ (self.command_name(), name) return tuple (values) def set_option (self, option, value): """Set the value of a single option for this command. Raise DistutilsOptionError if 'option' is not known.""" if not hasattr (self, option): raise DistutilsOptionError, \ "command %s: no such option %s" % \ (self.command_name(), option) if value is not None: setattr (self, option, value) def set_options (self, **optval): """Set the values of several options for this command. Raise DistutilsOptionError if any of the options specified as keyword arguments are not known.""" for k in optval.keys(): if optval[k] is not None: self.set_option (k, optval[k]) # -- Convenience methods for commands ------------------------------ 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 'set_initial_values()' and 'set_final_values()'. Usually called from 'set_final_values()' 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.find_command_obj (src_cmd) src_cmd_obj.set_final_options () try: for (src_option, dst_option) in option_pairs: if getattr (self, dst_option) is None: self.set_option (dst_option, src_cmd_obj.get_option (src_option)) except AttributeError, name: # duh, which command? raise DistutilsOptionError, "unknown option %s" % name def set_peer_option (self, command, option, value): """Attempt to simulate a command-line override of some option value in another command. Creates a command object for 'command' if necessary, sets 'option' to 'value', and invokes 'set_final_options()' on that command object. This will only have the desired effect if the command object for 'command' has not previously been created. Generally this is used to ensure that the options in 'command' dependent on 'option' are computed, hopefully (but not necessarily) deriving from 'value'. It might be more accurate to call this method 'influence_dependent_peer_options()'.""" cmd_obj = self.distribution.find_command_obj (command) cmd_obj.set_option (option, value) cmd_obj.set_final_options () def run_peer (self, command): """Run some other command: uses the 'run_command()' method of Distribution, which creates the command object if necessary and then invokes its 'run()' method.""" self.distribution.run_command (command) # end class Command