mirror of
https://github.com/ocrmypdf/OCRmyPDF.git
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129 lines
3.9 KiB
Python
129 lines
3.9 KiB
Python
# © 2020 James R. Barlow: github.com/jbarlow83
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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"""Plugin manager using pluggy."""
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import argparse
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import importlib
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import importlib.util
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import pkgutil
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import sys
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from pathlib import Path
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from typing import List, Sequence, Tuple, Union
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import pluggy
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import ocrmypdf.builtin_plugins
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from ocrmypdf import pluginspec
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from ocrmypdf.cli import get_parser, plugins_only_parser
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class OcrmypdfPluginManager(pluggy.PluginManager):
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"""pluggy.PluginManager that can fork.
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Capable of reconstructing itself in child workers.
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Arguments:
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setup_func: callback that initializes the plugin manager with all
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standard plugins
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"""
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def __init__(
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self,
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*args,
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plugins: List[Union[str, Path]],
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builtins: bool = True,
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**kwargs,
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):
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self.__init_args = args
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self.__init_kwargs = kwargs
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self.__plugins = plugins
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self.__builtins = builtins
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super().__init__(*args, **kwargs)
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self.setup_plugins()
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def __getstate__(self):
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state = dict(
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init_args=self.__init_args,
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plugins=self.__plugins,
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builtins=self.__builtins,
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init_kwargs=self.__init_kwargs,
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)
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return state
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def __setstate__(self, state):
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self.__init__(
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*state['init_args'],
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plugins=state['plugins'],
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builtins=state['builtins'],
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**state['init_kwargs'],
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)
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def setup_plugins(self):
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self.add_hookspecs(pluginspec)
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# 1. Register builtins
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if self.__builtins:
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for module in sorted(
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pkgutil.iter_modules(ocrmypdf.builtin_plugins.__path__)
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):
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name = f'ocrmypdf.builtin_plugins.{module.name}'
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module = importlib.import_module(name)
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self.register(module)
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# 2. Install semfree if needed
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try:
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# pylint: disable=import-outside-toplevel
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from multiprocessing.synchronize import SemLock
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del SemLock
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except ImportError:
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self.register(importlib.import_module('ocrmypdf.extra_plugins.semfree'))
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# 3. Register setuptools plugins
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self.load_setuptools_entrypoints('ocrmypdf')
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# 4. Register plugins specified on command line
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for name in self.__plugins:
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if isinstance(name, Path) or name.endswith('.py'):
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# Import by filename
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module_name = Path(name).stem
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spec = importlib.util.spec_from_file_location(module_name, name)
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module = importlib.util.module_from_spec(spec)
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sys.modules[module_name] = module
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spec.loader.exec_module(module)
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else:
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# Import by dotted module name
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module = importlib.import_module(name)
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self.register(module)
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def get_plugin_manager(plugins: List[Union[str, Path]], builtins=True):
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return OcrmypdfPluginManager(
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project_name='ocrmypdf',
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plugins=plugins,
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builtins=builtins,
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)
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def get_parser_options_plugins(
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args: Sequence[str],
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) -> Tuple[argparse.ArgumentParser, argparse.Namespace, pluggy.PluginManager]:
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pre_options, _unused = plugins_only_parser.parse_known_args(args=args)
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plugin_manager = get_plugin_manager(pre_options.plugins)
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parser = get_parser()
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plugin_manager.hook.initialize( # pylint: disable=no-member
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plugin_manager=plugin_manager
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)
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plugin_manager.hook.add_options(parser=parser) # pylint: disable=no-member
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options = parser.parse_args(args=args)
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return parser, options, plugin_manager
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__all__ = ['OcrmypdfPluginManager', 'get_plugin_manager', 'get_parser_options_plugins']
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