__license__ = 'GPL v3'
__copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
import enum
import importlib
import os
import sys
import zipfile
from calibre.constants import ismacos, iswindows, numeric_version
from calibre.ptempfile import PersistentTemporaryFile
if iswindows:
platform = 'windows'
elif ismacos:
platform = 'osx'
else:
platform = 'linux'
class PluginNotFound(ValueError):
pass
class InvalidPlugin(ValueError):
pass
class PluginInstallationType(enum.IntEnum):
EXTERNAL = 1
SYSTEM = 2
BUILTIN = 3
[Doku]
class Plugin: # {{{
'''
A calibre plugin. Useful members include:
* ``self.installation_type``: Stores how the plugin was installed.
* ``self.plugin_path``: Stores path to the ZIP file that contains
this plugin or None if it is a builtin
plugin
* ``self.site_customization``: Stores a customization string entered
by the user.
Methods that should be overridden in sub classes:
* :meth:`initialize`
* :meth:`customization_help`
Useful methods:
* :meth:`temporary_file`
* :meth:`__enter__`
* :meth:`load_resources`
'''
#: List of platforms this plugin works on.
#: For example: ``['windows', 'osx', 'linux']``
supported_platforms = []
#: The name of this plugin. You must set it something other
#: than Trivial Plugin for it to work.
name = 'Trivial Plugin'
#: The version of this plugin as a 3-tuple (major, minor, revision)
version = (1, 0, 0)
#: A short string describing what this plugin does
description = _('Does absolutely nothing')
#: The author of this plugin
author = _('Unknown')
#: When more than one plugin exists for a filetype,
#: the plugins are run in order of decreasing priority.
#: Plugins with higher priority will be run first.
#: The highest possible priority is ``sys.maxsize``.
#: Default priority is 1.
priority = 1
#: The earliest version of calibre this plugin requires
minimum_calibre_version = (0, 4, 118)
#: The way this plugin is installed
installation_type = None
#: If False, the user will not be able to disable this plugin. Use with
#: care.
can_be_disabled = True
#: The type of this plugin. Used for categorizing plugins in the
#: GUI
type = _('Base')
def __init__(self, plugin_path):
self.plugin_path = plugin_path
self.site_customization = None
[Doku]
def initialize(self):
'''
Called once when calibre plugins are initialized. Plugins are
re-initialized every time a new plugin is added. Also note that if the
plugin is run in a worker process, such as for adding books, then the
plugin will be initialized for every new worker process.
Perform any plugin specific initialization here, such as extracting
resources from the plugin ZIP file. The path to the ZIP file is
available as ``self.plugin_path``.
Note that ``self.site_customization`` is **not** available at this point.
'''
pass
[Doku]
def save_settings(self, config_widget):
'''
Save the settings specified by the user with config_widget.
:param config_widget: The widget returned by :meth:`config_widget`.
'''
raise NotImplementedError()
[Doku]
def do_user_config(self, parent=None):
'''
This method shows a configuration dialog for this plugin. It returns
True if the user clicks OK, False otherwise. The changes are
automatically applied.
'''
from qt.core import QApplication, QDialog, QDialogButtonBox, QLabel, QLineEdit, QScrollArea, QSize, Qt, QVBoxLayout
from calibre.gui2 import gprefs
prefname = 'plugin config dialog:'+self.type + ':' + self.name
config_dialog = QDialog(parent)
button_box = QDialogButtonBox(QDialogButtonBox.StandardButton.Ok | QDialogButtonBox.StandardButton.Cancel)
v = QVBoxLayout(config_dialog)
button_box.accepted.connect(config_dialog.accept)
button_box.rejected.connect(config_dialog.reject)
config_dialog.setWindowTitle(_('Customize') + ' ' + self.name)
try:
config_widget = self.config_widget()
except NotImplementedError:
config_widget = None
if isinstance(config_widget, tuple):
from calibre.gui2 import warning_dialog
warning_dialog(parent, _('Cannot configure'), config_widget[0],
det_msg=config_widget[1], show=True)
return False
if config_widget is not None:
class SA(QScrollArea):
def sizeHint(self):
sz = self.widget().sizeHint()
fw = 2 * self.frameWidth()
return QSize(sz.width() + self.verticalScrollBar().sizeHint().width() + fw, sz.height() + fw)
sa = SA(config_dialog)
sa.setWidget(config_widget)
sa.setWidgetResizable(True)
v.addWidget(sa)
v.addWidget(button_box)
if not config_dialog.restore_geometry(gprefs, prefname):
QApplication.instance().ensure_window_on_screen(config_dialog)
config_dialog.exec()
if config_dialog.result() == QDialog.DialogCode.Accepted:
if hasattr(config_widget, 'validate'):
if config_widget.validate():
self.save_settings(config_widget)
else:
self.save_settings(config_widget)
else:
from calibre.customize.ui import customize_plugin, plugin_customization
help_text = self.customization_help(gui=True)
help_text = QLabel(help_text, config_dialog)
help_text.setWordWrap(True)
help_text.setTextInteractionFlags(Qt.TextInteractionFlag.LinksAccessibleByMouse | Qt.TextInteractionFlag.LinksAccessibleByKeyboard)
help_text.setOpenExternalLinks(True)
v.addWidget(help_text)
sc = plugin_customization(self)
if not sc:
sc = ''
sc = sc.strip()
sc = QLineEdit(sc, config_dialog)
v.addWidget(sc)
v.addWidget(button_box)
config_dialog.restore_geometry(gprefs, prefname)
config_dialog.exec()
if config_dialog.result() == QDialog.DialogCode.Accepted:
sc = str(sc.text()).strip()
customize_plugin(self, sc)
config_dialog.save_geometry(gprefs, prefname)
return config_dialog.result()
[Doku]
def load_resources(self, names):
'''
If this plugin comes in a ZIP file (user added plugin), this method
will allow you to load resources from the ZIP file.
For example to load an image::
pixmap = QPixmap()
pixmap.loadFromData(self.load_resources(['images/icon.png'])['images/icon.png'])
icon = QIcon(pixmap)
:param names: List of paths to resources in the ZIP file using / as separator
:return: A dictionary of the form ``{name: file_contents}``. Any names
that were not found in the ZIP file will not be present in the
dictionary.
'''
if self.plugin_path is None:
raise ValueError('This plugin was not loaded from a ZIP file')
ans = {}
with zipfile.ZipFile(self.plugin_path, 'r') as zf:
for candidate in zf.namelist():
if candidate in names:
ans[candidate] = zf.read(candidate)
return ans
[Doku]
def customization_help(self, gui=False):
'''
Return a string giving help on how to customize this plugin.
By default raise a :class:`NotImplementedError`, which indicates that
the plugin does not require customization.
If you re-implement this method in your subclass, the user will
be asked to enter a string as customization for this plugin.
The customization string will be available as
``self.site_customization``.
Site customization could be anything, for example, the path to
a needed binary on the user's computer.
:param gui: If True return HTML help, otherwise return plain text help.
'''
raise NotImplementedError()
[Doku]
def temporary_file(self, suffix):
'''
Return a file-like object that is a temporary file on the file system.
This file will remain available even after being closed and will only
be removed on interpreter shutdown. Use the ``name`` member of the
returned object to access the full path to the created temporary file.
:param suffix: The suffix that the temporary file will have.
'''
return PersistentTemporaryFile(suffix)
def is_customizable(self):
try:
self.customization_help()
return True
except NotImplementedError:
return False
def __enter__(self, *args):
'''
Add this plugin to the python path so that it's contents become directly importable.
Useful when bundling large python libraries into the plugin. Use it like this::
with plugin:
import something
'''
if self.plugin_path is not None:
from importlib.machinery import EXTENSION_SUFFIXES
from calibre.utils.zipfile import ZipFile
with ZipFile(self.plugin_path) as zf:
extensions = {x.lower() for x in EXTENSION_SUFFIXES}
zip_safe = True
for name in zf.namelist():
for q in extensions:
if name.endswith(q):
zip_safe = False
break
if not zip_safe:
break
if zip_safe:
sys.path.append(self.plugin_path)
self.sys_insertion_path = self.plugin_path
else:
from calibre.ptempfile import TemporaryDirectory
self._sys_insertion_tdir = TemporaryDirectory('plugin_unzip')
self.sys_insertion_path = self._sys_insertion_tdir.__enter__(*args)
zf.extractall(self.sys_insertion_path)
sys.path.append(self.sys_insertion_path)
def __exit__(self, *args):
ip, it = getattr(self, 'sys_insertion_path', None), getattr(self,
'_sys_insertion_tdir', None)
if ip in sys.path:
sys.path.remove(ip)
if hasattr(it, '__exit__'):
it.__exit__(*args)
[Doku]
def cli_main(self, args):
'''
This method is the main entry point for your plugins command line
interface. It is called when the user does: calibre-debug -r "Plugin
Name". Any arguments passed are present in the args variable.
'''
raise NotImplementedError('The %s plugin has no command line interface'
%self.name)
# }}}
[Doku]
class FileTypePlugin(Plugin): # {{{
'''
A plugin that is associated with a particular set of file types.
'''
#: Set of file types for which this plugin should be run.
#: Use '*' for all file types.
#: For example: ``{'lit', 'mobi', 'prc'}``
file_types = set()
#: If True, this plugin is run when books are added
#: to the database
on_import = False
#: If True, this plugin is run after books are added
#: to the database. In this case the postimport and postadd
#: methods of the plugin are called.
on_postimport = False
#: If True, this plugin is run after a book is converted.
#: In this case the postconvert method of the plugin is called.
on_postconvert = False
#: If True, this plugin is run after a book file is deleted
#: from the database. In this case the postdelete method of
#: the plugin is called.
on_postdelete = False
#: If True, this plugin is run just before a conversion
on_preprocess = False
#: If True, this plugin is run after conversion
#: on the final file produced by the conversion output plugin.
on_postprocess = False
type = _('File type')
[Doku]
def run(self, path_to_ebook):
'''
Run the plugin. Must be implemented in subclasses.
It should perform whatever modifications are required
on the e-book and return the absolute path to the
modified e-book. If no modifications are needed, it should
return the path to the original e-book. If an error is encountered
it should raise an Exception. The default implementation
simply return the path to the original e-book. Note that the path to
the original file (before any file type plugins are run, is available as
self.original_path_to_file).
The modified e-book file should be created with the
:meth:`temporary_file` method.
:param path_to_ebook: Absolute path to the e-book.
:return: Absolute path to the modified e-book.
'''
# Default implementation does nothing
return path_to_ebook
[Doku]
def postimport(self, book_id, book_format, db):
'''
Called post import, i.e., after the book file has been added to the database. Note that
this is different from :meth:`postadd` which is called when the book record is created for
the first time. This method is called whenever a new file is added to a book record. It is
useful for modifying the book record based on the contents of the newly added file.
:param book_id: Database id of the added book.
:param book_format: The file type of the book that was added.
:param db: Library database.
'''
pass # Default implementation does nothing
[Doku]
def postconvert(self, book_id, book_format, db):
'''
Called post conversion, i.e., after the conversion output book file has been added to the database.
Note that it is run after a conversion only, not after a book is added. It is useful for modifying
the book record based on the contents of the newly added file.
:param book_id: Database id of the added book.
:param book_format: The file type of the book that was added.
:param db: Library database.
'''
pass # Default implementation does nothing
[Doku]
def postdelete(self, book_id, book_format, db):
'''
Called post deletion, i.e., after the book file has been deleted from the database. Note
that it is not run when a book record is deleted, only when one or more formats from the
book are deleted. It is useful for modifying the book record based on the format of the
deleted file.
:param book_id: Database id of the added book.
:param book_format: The file type of the book that was added.
:param db: Library database.
'''
pass # Default implementation does nothing
[Doku]
def postadd(self, book_id, fmt_map, db):
'''
Called post add, i.e. after a book has been added to the db. Note that
this is different from :meth:`postimport`, which is called after a single book file
has been added to a book. postadd() is called only when an entire book record
with possibly more than one book file has been created for the first time.
This is useful if you wish to modify the book record in the database when the
book is first added to calibre.
:param book_id: Database id of the added book.
:param fmt_map: Map of file format to path from which the file format
was added. Note that this might or might not point to an actual
existing file, as sometimes files are added as streams. In which case
it might be a dummy value or a non-existent path.
:param db: Library database
'''
pass # Default implementation does nothing
# }}}
# }}}
# }}}
[Doku]
class CatalogPlugin(Plugin): # {{{
'''
A plugin that implements a catalog generator.
'''
resources_path = None
#: Output file type for which this plugin should be run.
#: For example: 'epub' or 'xml'
file_types = set()
type = _('Catalog generator')
#: CLI parser options specific to this plugin, declared as `namedtuple` `Option`:
#:
#: from collections import namedtuple
#: Option = namedtuple('Option', 'option, default, dest, help')
#: cli_options = [Option('--catalog-title', default = 'My Catalog',
#: dest = 'catalog_title', help = (_('Title of generated catalog. \nDefault:') + " '" + '%default' + "'"))]
#: cli_options parsed in calibre.db.cli.cmd_catalog:option_parser()
#:
cli_options = []
def _field_sorter(self, key):
'''
Custom fields sort after standard fields
'''
if key.startswith('#'):
return '~%s' % key[1:]
else:
return key
def search_sort_db(self, db, opts):
db.search(opts.search_text)
if getattr(opts, 'sort_by', None):
# 2nd arg = ascending
db.sort(opts.sort_by, True)
return db.get_data_as_dict(ids=opts.ids)
def get_output_fields(self, db, opts):
# Return a list of requested fields
all_std_fields = {'author_sort','authors','comments','cover','formats',
'id','isbn','library_name','ondevice','pubdate','publisher',
'rating','series_index','series','size','tags','timestamp',
'title_sort','title','uuid','languages','identifiers'}
all_custom_fields = set(db.custom_field_keys())
for field in list(all_custom_fields):
fm = db.field_metadata[field]
if fm['datatype'] == 'series':
all_custom_fields.add(field+'_index')
all_fields = all_std_fields.union(all_custom_fields)
if getattr(opts, 'fields', 'all') != 'all':
# Make a list from opts.fields
of = [x.strip() for x in opts.fields.split(',')]
requested_fields = set(of)
# Validate requested_fields
if requested_fields - all_fields:
from calibre.library import current_library_name
invalid_fields = sorted(list(requested_fields - all_fields))
print("invalid --fields specified: %s" % ', '.join(invalid_fields))
print("available fields in '%s': %s" %
(current_library_name(), ', '.join(sorted(list(all_fields)))))
raise ValueError("unable to generate catalog with specified fields")
fields = [x for x in of if x in all_fields]
else:
fields = sorted(all_fields, key=self._field_sorter)
if not opts.connected_device['is_device_connected'] and 'ondevice' in fields:
fields.pop(int(fields.index('ondevice')))
return fields
[Doku]
def initialize(self):
'''
If plugin is not a built-in, copy the plugin's .ui and .py files from
the ZIP file to $TMPDIR.
Tab will be dynamically generated and added to the Catalog Options dialog in
calibre.gui2.dialogs.catalog.py:Catalog
'''
from calibre.customize.builtins import plugins as builtin_plugins
from calibre.customize.ui import config
from calibre.ptempfile import PersistentTemporaryDirectory
if type(self) not in builtin_plugins and self.name not in config['disabled_plugins']:
files_to_copy = [f"{self.name.lower()}.{ext}" for ext in ["ui","py"]]
resources = zipfile.ZipFile(self.plugin_path,'r')
if self.resources_path is None:
self.resources_path = PersistentTemporaryDirectory('_plugin_resources', prefix='')
for file in files_to_copy:
try:
resources.extract(file, self.resources_path)
except:
print(f" customize:__init__.initialize(): {file} not found in {os.path.basename(self.plugin_path)}")
continue
resources.close()
[Doku]
def run(self, path_to_output, opts, db, ids, notification=None):
'''
Run the plugin. Must be implemented in subclasses.
It should generate the catalog in the format specified
in file_types, returning the absolute path to the
generated catalog file. If an error is encountered
it should raise an Exception.
The generated catalog file should be created with the
:meth:`temporary_file` method.
:param path_to_output: Absolute path to the generated catalog file.
:param opts: A dictionary of keyword arguments
:param db: A LibraryDatabase2 object
'''
# Default implementation does nothing
raise NotImplementedError('CatalogPlugin.generate_catalog() default '
'method, should be overridden in subclass')
# }}}
[Doku]
class InterfaceActionBase(Plugin): # {{{
supported_platforms = ['windows', 'osx', 'linux']
author = 'Kovid Goyal'
type = _('User interface action')
can_be_disabled = False
actual_plugin = None
def __init__(self, *args, **kwargs):
Plugin.__init__(self, *args, **kwargs)
self.actual_plugin_ = None
[Doku]
def load_actual_plugin(self, gui):
'''
This method must return the actual interface action plugin object.
'''
ac = self.actual_plugin_
if ac is None:
mod, cls = self.actual_plugin.split(':')
ac = getattr(importlib.import_module(mod), cls)(gui,
self.site_customization)
self.actual_plugin_ = ac
return ac
# }}}
[Doku]
class PreferencesPlugin(Plugin): # {{{
'''
A plugin representing a widget displayed in the Preferences dialog.
This plugin has only one important method :meth:`create_widget`. The
various fields of the plugin control how it is categorized in the UI.
'''
supported_platforms = ['windows', 'osx', 'linux']
author = 'Kovid Goyal'
type = _('Preferences')
can_be_disabled = False
#: Import path to module that contains a class named ConfigWidget
#: which implements the ConfigWidgetInterface. Used by
#: :meth:`create_widget`.
config_widget = None
#: Where in the list of categories the :attr:`category` of this plugin should be.
category_order = 100
#: Where in the list of names in a category, the :attr:`gui_name` of this
#: plugin should be
name_order = 100
#: The category this plugin should be in
category = None
#: The category name displayed to the user for this plugin
gui_category = None
#: The name displayed to the user for this plugin
gui_name = None
#: The icon for this plugin, should be an absolute path
icon = None
#: The description used for tooltips and the like
description = None
# }}}
class StoreBase(Plugin): # {{{
supported_platforms = ['windows', 'osx', 'linux']
author = 'John Schember'
type = _('Store')
# Information about the store. Should be in the primary language
# of the store. This should not be translatable when set by
# a subclass.
description = _('An e-book store.')
minimum_calibre_version = (0, 8, 0)
version = (1, 0, 1)
actual_plugin = None
# Does the store only distribute e-books without DRM.
drm_free_only = False
# This is the 2 letter country code for the corporate
# headquarters of the store.
headquarters = ''
# All formats the store distributes e-books in.
formats = []
# Is this store on an affiliate program?
affiliate = False
def load_actual_plugin(self, gui):
'''
This method must return the actual interface action plugin object.
'''
mod, cls = self.actual_plugin.split(':')
self.actual_plugin_object = getattr(importlib.import_module(mod), cls)(gui, self.name)
return self.actual_plugin_object
def customization_help(self, gui=False):
if getattr(self, 'actual_plugin_object', None) is not None:
return self.actual_plugin_object.customization_help(gui)
raise NotImplementedError()
def config_widget(self):
if getattr(self, 'actual_plugin_object', None) is not None:
return self.actual_plugin_object.config_widget()
raise NotImplementedError()
def save_settings(self, config_widget):
if getattr(self, 'actual_plugin_object', None) is not None:
return self.actual_plugin_object.save_settings(config_widget)
raise NotImplementedError()
# }}}
class EditBookToolPlugin(Plugin): # {{{
type = _('Edit book tool')
minimum_calibre_version = (1, 46, 0)
# }}}
class LibraryClosedPlugin(Plugin): # {{{
'''
LibraryClosedPlugins are run when a library is closed, either at shutdown,
when the library is changed, or when a library is used in some other way.
At the moment these plugins won't be called by the CLI functions.
'''
type = _('Library closed')
# minimum version 2.54 because that is when support was added
minimum_calibre_version = (2, 54, 0)
def run(self, db):
'''
The db will be a reference to the new_api (db.cache.py).
The plugin must run to completion. It must not use the GUI, threads, or
any signals.
'''
raise NotImplementedError('LibraryClosedPlugin '
'run method must be overridden in subclass')
# }}}
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