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# Copyright 2012-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
import sys
import logging
import os
import platform
from subprocess import Popen, PIPE
from docutils.core import publish_string
import bcdoc
from bcdoc.clidocs import ReSTDocument
from bcdoc.clidocs import ProviderDocumentEventHandler
from bcdoc.clidocs import ServiceDocumentEventHandler
from bcdoc.clidocs import OperationDocumentEventHandler
import bcdoc.clidocevents
from bcdoc.textwriter import TextWriter
from awscli.argprocess import ParamShorthand
LOG = logging.getLogger('awscli.help')
class ExecutableNotFoundError(Exception):
def __init__(self, executable_name):
super(ExecutableNotFoundError, self).__init__(
'Could not find executable named "%s"' % executable_name)
def get_renderer():
"""
Return the appropriate HelpRenderer implementation for the
current platform.
"""
if platform.system() == 'Windows':
return WindowsHelpRenderer()
else:
return PosixHelpRenderer()
class HelpRenderer(object):
"""
Interface for a help renderer.
The renderer is responsible for displaying the help content on
a particular platform.
"""
def render(self, contents):
"""
Each implementation of HelpRenderer must implement this
render method.
"""
pass
class PosixHelpRenderer(HelpRenderer):
"""
Render help content on a Posix-like system. This includes
Linux and MacOS X.
"""
PAGER = 'more'
def get_pager_cmdline(self):
pager = self.PAGER
if 'MANPAGER' in os.environ:
pager = os.environ['MANPAGER']
elif 'PAGER' in os.environ:
pager = os.environ['PAGER']
return pager.split()
def render(self, contents):
rst2man = self._get_rst2man_name()
cmdline = [rst2man]
LOG.debug("Running command: %s", cmdline)
p2 = self._popen(cmdline, stdin=PIPE, stdout=PIPE)
p2.stdin.write(contents)
p2.stdin.close()
if not self._exists_on_path('groff'):
raise ExecutableNotFoundError('groff')
cmdline = ['groff', '-man', '-T', 'ascii']
LOG.debug("Running command: %s", cmdline)
p3 = self._popen(cmdline, stdin=p2.stdout, stdout=PIPE)
cmdline = self.get_pager_cmdline()
LOG.debug("Running command: %s", cmdline)
p4 = self._popen(cmdline, stdin=p3.stdout)
p4.communicate()
sys.exit(1)
def _get_rst2man_name(self):
if self._exists_on_path('rst2man.py'):
return 'rst2man.py'
elif self._exists_on_path('rst2man'):
# Some distros like ubuntu will rename rst2man.py to rst2man
# if you install their version (i.e. "apt-get install
# python-docutils"). Though they could technically rename
# this to anything we'll support it renamed to 'rst2man' by
# explicitly checking for this case ourself.
return 'rst2man'
else:
# Give them the original name as set from docutils.
raise ExecutableNotFoundError('rst2man.py')
def _exists_on_path(self, name):
# Since we're only dealing with POSIX systems, we can
# ignore things like PATHEXT.
return any([os.path.exists(os.path.join(p, name))
for p in os.environ.get('PATH', []).split(os.pathsep)])
def _popen(self, *args, **kwargs):
return Popen(*args, **kwargs)
class WindowsHelpRenderer(HelpRenderer):
"""
Render help content on a Windows platform.
"""
def render(self, contents):
text_output = publish_string(contents,
writer=TextWriter())
sys.stdout.write(text_output.decode('utf-8'))
sys.exit(1)
class RawRenderer(HelpRenderer):
"""
Render help as the raw ReST document.
"""
def render(self, contents):
sys.stdout.write(contents)
sys.exit(1)
class HelpCommand(object):
"""
HelpCommand Interface
---------------------
A HelpCommand object acts as the interface between objects in the
CLI (e.g. Providers, Services, Operations, etc.) and the documentation
system (bcdoc).
A HelpCommand object wraps the object from the CLI space and provides
a consistent interface to critical information needed by the
documentation pipeline such as the object's name, description, etc.
The HelpCommand object is passed to the component of the
documentation pipeline that fires documentation events. It is
then passed on to each document event handler that has registered
for the events.
All HelpCommand objects contain the following attributes:
+ ``session`` - A ``botocore`` ``Session`` object.
+ ``obj`` - The object that is being documented.
+ ``command_table`` - A dict mapping command names to
callable objects.
+ ``arg_table`` - A dict mapping argument names to callable objects.
+ ``doc`` - A ``Document`` object that is used to collect the
generated documentation.
In addition, please note the `properties` defined below which are
required to allow the object to be used in the document pipeline.
Implementations of HelpCommand are provided here for Provider,
Service and Operation objects. Other implementations for other
types of objects might be needed for customization in plugins.
As long as the implementations conform to this basic interface
it should be possible to pass them to the documentation system
and generate interactive and static help files.
"""
EventHandlerClass = None
"""
Each subclass should define this class variable to point to the
EventHandler class used by this HelpCommand.
"""
def __init__(self, session, obj, command_table, arg_table):
self.session = session
self.obj = obj
self.command_table = command_table
self.arg_table = arg_table
self.renderer = get_renderer()
self.doc = ReSTDocument(target='man')
@property
def event_class(self):
"""
Return the ``event_class`` for this object.
The ``event_class`` is used by the documentation pipeline
when generating documentation events. For the event below::
doc-title.<event_class>.<name>
The document pipeline would use this property to determine
the ``event_class`` value.
"""
pass
@property
def name(self):
"""
Return the name of the wrapped object.
This would be called by the document pipeline to determine
the ``name`` to be inserted into the event, as shown above.
"""
pass
def __call__(self, args, parsed_globals):
# Create an event handler for a Provider Document
instance = self.EventHandlerClass(self)
# Now generate all of the events for a Provider document.
# We pass ourselves along so that we can, in turn, get passed
# to all event handlers.
bcdoc.clidocevents.generate_events(self.session, self)
self.renderer.render(self.doc.getvalue())
instance.unregister()
class ProviderHelpCommand(HelpCommand):
"""Implements top level help command.
This is what is called when ``aws help`` is run.
"""
EventHandlerClass = ProviderDocumentEventHandler
def __init__(self, session, command_table, arg_table,
description, synopsis, usage):
HelpCommand.__init__(self, session, session.provider,
command_table, arg_table)
self.description = description
self.synopsis = synopsis
self.help_usage = usage
@property
def event_class(self):
return 'Provider'
@property
def name(self):
return self.obj.name
class ServiceHelpCommand(HelpCommand):
"""Implements service level help.
This is the object invoked whenever a service command
help is implemented, e.g. ``aws ec2 help``.
"""
EventHandlerClass = ServiceDocumentEventHandler
def __init__(self, session, obj, command_table, arg_table, name,
event_class):
super(ServiceHelpCommand, self).__init__(session, obj, command_table,
arg_table)
self._name = name
self._event_class = event_class
@property
def event_class(self):
return self._event_class
@property
def name(self):
return self._name
class OperationHelpCommand(HelpCommand):
"""Implements operation level help.
This is the object invoked whenever help for a service is requested,
e.g. ``aws ec2 describe-instances help``.
"""
EventHandlerClass = OperationDocumentEventHandler
def __init__(self, session, service, operation, arg_table, name,
event_class):
HelpCommand.__init__(self, session, operation, None, arg_table)
self.service = service
self.param_shorthand = ParamShorthand()
self._name = name
self._event_class = event_class
@property
def event_class(self):
return self._event_class
@property
def name(self):
return self._name