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calibre User Manual, Release 2.57.1

• Genres - individual genres presented in a list, sorted by Authorand Series.

• Recently Added -all books,sorted in reverse chronological order. List includes books added in the last 30 days,

then a month-by-month listing of added books.

• Descriptions - detailed description page for each book, including a cover thumbnail and comments. Sorted by

author,with non-series books listed before series books.

Preﬁxes

Preﬁx rules allow you to add a preﬁx to book listings when certain criteria are met. For example, you might want to

mark books you’ve read with a checkmark,or books on your wishlist with an X.

The checkbox in the ﬁrst column enables the rule. Name is a rule name that you provide. Field is either Tags or a

custom column from your library. Value is the content of Field to match. When a preﬁx rule is satisﬁed, the book will

be marked with the selectedPreﬁx.

Three preﬁx rules have been speciﬁed in the example above:

1. Read book speciﬁes that a book with any date in a custom column named Last read will be preﬁxed with a

checkmark symbol.

2. Wishlist item speciﬁes that any book with a Wishlist tag will be preﬁxed with an X symbol.

3. Library books speciﬁes that any book with a value of True (or Yes) in a custom column Available in Library

will be preﬁxed with a double arrow symbol.

The ﬁrst matching rule supplies the preﬁx. Disabled orincomplete rules are ignored.

Excluded books

Exclusion rules allow you to specify books that will not be cataloged.

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calibre User Manual, Release 2.57.1

The checkbox in the ﬁrst column enables the rule. Name is a rule name that you provide. Field is either Tags or a

custom column in your library. Value is the content of Field to match. When an exclusion rule is satisﬁed, the book

will be excluded from the generated catalog.

Twoexclusion rules have been speciﬁed in the example above:

1. The Catalogs rule speciﬁes that any book with a Catalog tag will be excludedfrom the generated catalog.

2. The Archived Books rule speciﬁes that any book with a value of Archived in the custom column Status will be

excluded fromthe generated catalog.

All rules are evaluated forevery book. Disabled or incomplete rules are ignored.

Excluded genres

When the catalogis generated,tags inyour databaseare used as genres. For example, you may usethe tags Fiction

andNonfiction. These tags become genres in the generated catalog, withbooks listed under their respective genre

lists based on their assigned tags. A book will be listed in every genre section for which it has a corresponding tag.

Youmay be using certain tags forotherpurposes, perhaps a+ to indicate areadbook,or abracketed tag like[Amazon

Freebie] to indicate a book’s source. The Excluded genres regex allows you to specify tags that you don’t want

usedas genres in the generated catalog. The default exclusion regex pattern \[.+\]\+ excludes anytags of the form

[tag],as well as excluding +, the default tag for read books, frombeing used as genres in the generated catalog.

You can also use an exact tag name in a regex. Forexample, [Amazon Freebie] or [Project Gutenberg].

If you want to list multiple exact tags for exclusion, put a pipe (vertical bar) character between them: [Amazon

Freebie]|[Project Gutenberg].

Results of regex shows you which tags will be excluded when the catalog is built, based on the tags in your database

and the regexpattern you enter. The results are updated as you modify the regex pattern.

Other options

Catalog cover speciﬁes whether to generate a new cover or use an existing cover. It is possible to create a custom

cover for your catalogs - seeCustomcatalogcovers(page 189) for more information. If you have created a custom

coverthat you want to reuse,select Use existing cover. Otherwise,select Generate new cover.

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calibre User Manual, Release 2.57.1

ExtraDescription note speciﬁes a customcolumn’s contents to be inserted into the Description page,next to the cover

thumbnail. For example, you might want to display the date you last read a book using a Last Read custom column.

For advanced use of the Description note feature, seethispostinthecalibreforum

Thumb width speciﬁes a width preference for cover thumbnails included with Descriptions pages. Thumbnails are

cached to improve performance.To experiment with different widths, try generating a catalog with just a few books

until you’ve determined your preferred width, then generate your full catalog. The ﬁrst time a catalog is generated

with a new thumbnail width, performance will be slower, but subsequent builds of the catalog will take advantage of

the thumbnail cache.

Merge with Comments speciﬁes a customcolumn whose content will benon-destructively merged with theComments

metadata during catalog generation. For example, you might have a custom column Author Bio that you’d like to

appendtotheCommentsmetadata. You canchoose to insert the customcolumn contents before or after theComments

section, and optionally separate the appended content with a horizontal rule separator. Eligible custom column types

include text, comments, and composite.

Custom catalog covers

With theGenerateCoverplugin91 installed, you can create cus-

tom covers foryour catalog. To install the plugin, go to Preferences > Advanced > Plugins > Get new plugins.

Additional help resources

For more information on calibre’s Catalog feature, see the MobileRead forumstickyCreatingCatalogs-Starthere

where you can ﬁnd information on how to customize the catalog templates, and how to submit a bug report.

To ask questions or discuss calibre’s Catalog feature with other users, visit the MobileRead forumCalibreCatalogs

http://www.mobileread.com/forums/showpost.php?p=1335767&postcount=395

http://www.mobileread.com/forums/showthread.php?t=124219

http://www.mobileread.com/forums/showthread.php?t=118556

http://www.mobileread.com/forums/forumdisplay.php?f=236

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calibre User Manual, Release 2.57.1

1.9.9 Virtual Libraries

In calibre, a virtual library is a way to tell calibre to open only a subset of a normal library. For example, you might

want to only work with books by a certain author, or books having only a certain tag. Using virtual libraries is the

preferred way of partitioning yourlarge book collectioninto smaller subcollections. It is superior to splitting up your

library into multiple smaller libraries as, when you want to search through your entire collection, you can simply go

back to the full library. There is no way to search through multiple separate libraries simultaneously in calibre.

Avirtual library is different from a simple search. A search will only restrict the list of books shown in the book list.

Avirtual library does that, and in addition it also restricts the entries shown in the Tag Browser to the left. The Tag

Browser will only show tags, authors, series,publishers, etc. that come from the books in the virtual library. A virtual

library thus behaves as though the actual library contains only the restricted set of books.

Creating Virtual Libraries

Touse a virtuallibraryclicktheVirtual Library button located totheleft ofthe search

barandselect the Create Virtual Library option. As a ﬁrst example,let’s create a virtual library that shows us only the

books by a particular author. Click the Authors link as shown in the image below and choose the author you want to

use and click OK.

The Create Virtual Library dialog has been ﬁlled in for you. Click OK and youwill see that a new Virtual Library has

been created, and automatically switched to, that displays only the books by the selected author. As far as calibre is

concerned,it is as if your library contains only the books by the selected author.

You can switch back to the full library at any time by once again clicking the Virtual Library and selecting the entry

named <None>.

Virtual Libraries are basedon searches. You can use anysearchas thebasis ofa virtual library. The virtual librarywill

contain only the books matched by that search. First, type in the search you want to use in the search bar or build a

search using the Tag Browser. When you are happy with the returned results, click the Virtual Library button, choose

Create Library and entera name forthe newvirtual library. The virtuallibrary will thenbe createdbased on the search

you just typed in. Searches are very powerful, for examples of the kinds of things you can do with them, seeThe

Search Interface(page11).

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calibre User Manual, Release 2.57.1

Examples of usefulVirtual Libraries

• Books addedto calibre inthe lastday:: date:>1daysago

• Books addedto calibre inthe lastmonth:: date:>30daysago

• Books with a rating of 5 stars:: rating:5

• Books with a rating of atleast 4stars:: rating:>=4

• Books with no rating:: rating:false

• Periodicals downloaded by the Fetch News function incalibre:: tags:=News and author:=calibre

• Books with no tags:: tags:false

• Books with no covers:: cover:false

Working with Virtual Libraries

You can edit a previously created virtual library or remove it, by clicking the Virtual Library and choosing the appro-

priate action.

You can tell calibre that you always want to apply a particular virtual library when the current library is opened, by

going to Preferences->Behavior.

If you use the calibre Content Server, you can have it share a virtual library instead of the full library by going to

Preferences->Sharing over the net.

You can quickly use the current search as a temporary virtual library by clicking the Virtual Library button and

choosing the *current search entry.

Youcandisplayallavailablevirtual libraries as tabs above the booklist. This is particularlyhandyifyoulikeswitching

between virtual libraries very often. Click the Virtual Library button and select Show virtual libraries as tabs. You

can re-arrange the tabs by drag and drop and close ones you do not want to see. Closed tabs can be restored by

right-clicking on the tab bar.

Using additional restrictions

Youcan further restrict the books shown ina Virtual Library by usingAdditional restrictions. An additional restriction

is saved search you previously created that can be applied to the current Virtual Library to further restrict the books

shown in a virtual library. For example, say you have a Virtual Library for books tagged as Historical Fiction and

asaved search that shows you unread books, you can click the Virtual Library button and choose the Additional

restriction option to show only unread Historical Fiction books. To learn about saved searches, seeSavingsearches

(page 13).

1.10 Customizing calibre

calibre has a highly modulardesign. Various parts of it can be customized. You can learn how to create recipes to add

new sources of online content to calibre in the SectionAddingyourfavoritenewswebsite(page 23). Here, you will

learn,ﬁrst,how to use environment variables and tweaks tocustomize calibre’s behavior,and thenhow tospecify your

ownstatic resources like iconsandtemplates tooverride the defaults and ﬁnallyhow to use plugins toaddfunctionality

to calibre.

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calibre User Manual, Release 2.57.1

• Environmentvariables(page 215)

• Tweaks(page 216)

• Overridingicons,templates,etcetera(page 226)

• Creatingyourowniconthemeforcalibre(page 227)

• Customizingcalibrewithplugins(page 227)

1.10.1 API Documentation for plugins

Deﬁnes various abstract base classes that can be subclassed to create powerful plugins. The useful classes are:

• Plugin(page 192)

• FileTypePlugin(page 194)

• Metadataplugins(page 195)

• Catalogplugins(page 196)

• Metadatadownloadplugins(page 196)

• Conversionplugins(page 199)

• DeviceDrivers(page 201)

• UserInterfaceActions(page 210)

• PreferencesPlugins(page 213)

• Viewerplugins(page 215)

Plugin

class calibre.customize.Plugin(plugin_path)

Acalibre plugin. Useful members include:

•self.plugin_path: Stores path to the zip ﬁle thatcontains 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:

•initialize() (page 193)

•customization_help() (page 194)

Useful methods:

•temporary_file() (page 194)

•__enter__()

•load_resources() (page 193)

supported_platforms = []

List of platforms this plugin works on. For example: [’windows’, ’osx’, ’linux’]

name = ‘Trivial Plugin’

The name of this plugin. You must set it something other than Trivial Plugin forit to work.

version = (1, 0,0)

The version of this plugin as a 3-tuple (major, minor, revision)

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description = u’Does absolutely nothing’

Ashort string describingwhat this plugin does

author = u’Unknown’

The author of this plugin

priority = 1

When more than one plugin exists for a ﬁletype, the plugins are run in order of decreasing priority i.e.

plugins with higher priority will be run ﬁrst. The highest possible priority is sys.maxint. Default

priority is 1.

minimum_calibre_version = (0,4, 118)

The earliest version of calibre this plugin requires

can_be_disabled = True

If False, the user will not be able to disable this plugin. Use with care.

type = u’Base’

The type of this plugin. Used forcategorizing plugins in the GUI

initialize()

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 notavailable at this point.

config_widget()

Implement this method andsave_settings() (page 193)inyourplugintouse a customconﬁguration

dialog,rather then relying on the simple string based default customization.

This method, if implemented, must return a QWidget. The widget can have an optional method validate()

thattakes noarguments andis called immediatelyaftertheuserclicks OK. Changes areappliedifandonly

if the method returns True.

Ifforsomereason youcannot performthe conﬁguration atthis time,return atuple oftwostrings (message,

details),these will be displayed as a warning dialog to the userand the process will be aborted.

save_settings(conﬁg_widget)

Save the settings speciﬁed by the user with conﬁg_widget.

Parameters config_widget – The widget returned byconfig_widget() (page 193).

do_user_config(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.

load_resources(names)

If this plugin comes in a ZIP ﬁle (user added plugin), this method will allow you to load resources from

the ZIPﬁle.

For example to load an image:

pixmap = QPixmap()

pixmap.loadFromData(self.load_resources(['images/icon.png']).itervalues().next())

icon = QIcon(pixmap)

Parameters names – List of paths to resources in the zip ﬁle using / as separator

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Returns 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.

customization_help(gui=False)

Return a string giving help on how to customize this plugin.

By default raise a

NotImplementedError, which indicates that the plugin does not require customization.

If you re-implement this method in your subclass, the user will be asked toentera 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.

Parameters gui – If True return HTML help,otherwise return plain text help.

temporary_file(sufﬁx)

Return a ﬁle-like objectthat 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.

Parameters suffix – The sufﬁx that the temporaryﬁle will have.

cli_main(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.

FileTypePlugin

class calibre.customize.FileTypePlugin(plugin_path)

Bases:calibre.customize.Plugin (page 192)

Aplugin that is associated with a particular set of ﬁle types.

file_types = set([])

Set of ﬁle types for which this plugin should be run. Forexample: {’lit’, ’mobi’, ’prc’}

on_import = False

If True, this plugin is run when books are added to the database

on_postimport = 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_preprocess = False

If True, this plugin is run just before a conversion

on_postprocess = False

If True, this plugin is run after conversion on the ﬁnal ﬁle produced by the conversion output plugin.

run(path_to_ebook)

Runtheplugin. Mustbe implemented in subclasses. Itshouldperformwhatevermodiﬁcations are required

on the ebook and return the absolute path to the modiﬁed ebook. If no modiﬁcations are needed, it should

return the path to the original ebook. If an error is encountered it should raise an Exception. The default

implementation simply return the path to the original ebook.

The modiﬁed ebook ﬁle should be created with the temporary_file() method.

Parameters path_to_ebook – Absolute path to the ebook.

Returns Absolute path to the modiﬁed ebook.

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postimport(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

postadd()(page195)whichiscalledwhenthebookrecordiscreatedfortheﬁrsttime.Thismethodis

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.

Parameters

• book_id – Database id ofthe added book.

• book_format – The ﬁle type of the book that was added.

• db – Library database.

postadd(book_id,fmt_map, db)

Called postadd,i.e. afterabookhasbeenaddedtothedb. Notethatthis is differentfrompostimport()

(page 194), whichis called aftera single book ﬁle has been addedto a book. postadd() is called onlywhen

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.

Parameters

• book_id – Database id ofthe added book.

• 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 an on-existent path.

• db – Library database

Metadata plugins

class calibre.customize.MetadataReaderPlugin(*args, **kwargs)

Bases:calibre.customize.Plugin (page 192)

Aplugin that implements reading metadata from a set of ﬁle types.

file_types = set([])

Setofﬁletypes for whichthis pluginshould berun Forexample: set([’lit’, ’mobi’, ’prc’])

get_metadata(stream, type)

Returnmetadata for the ﬁlerepresented by stream(a ﬁle like object that supports reading). Raisean excep-

tion when there is an error with the input data. :param type: The type of ﬁle. Guaranteed to be one of the

entries infile_types (page 195). :return: A calibre.ebooks.metadata.book.Metadata

object

class calibre.customize.MetadataWriterPlugin(*args, **kwargs)

Bases:calibre.customize.Plugin (page 192)

Aplugin that implements reading metadata from a set of ﬁle types.

file_types = set([])

Setofﬁletypes for whichthis pluginshould berun Forexample: set([’lit’, ’mobi’, ’prc’])

set_metadata(stream, mi, type)

Setmetadata for the ﬁle representedby stream(a ﬁle like object that supports reading). Raise an exception

whenthereis anerrorwiththeinputdata. :param type: Thetype ofﬁle. Guaranteedtobe one of the entries

infile_types (page 195). :parammi: Acalibre.ebooks.metadata.book.Metadata object

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Catalog plugins

class calibre.customize.CatalogPlugin(plugin_path)

Bases:calibre.customize.Plugin (page 192)

Aplugin that implements a catalog generator.

file_types = set([])

Output ﬁle type for which this plugin should be run For example: ‘epub’or ‘xml’

cli_options = []

CLI parser options speciﬁc to this plugin, declared as namedtuple Option:

from collections import t namedtuple

Option = namedtuple('Option', , 'option, default, , dest, help')

cli_options = [Option('--catalog-title',

default = 'My Catalog',

dest = 'catalog_title',

help = (_('Title of f generated d catalog. . \nDefault:') + " '" " +

'%default' + "'"))]

cli_options parsed in library.cli:catalog_option_parser()

initialize()

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 andaddedto the Catalog Options dialog in calibre.gui2.dialogs.catalog.py:Catalog

run(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 temporary_file() method.

Parameters

• path_to_output – Absolute pathto the generated catalog ﬁle.

• opts – A dictionary of keyword arguments

• db – A LibraryDatabase2 object

Metadata download plugins

class calibre.ebooks.metadata.sources.base.Source(*args, **kwargs)

Bases:calibre.customize.Plugin (page 192)

capabilities = frozenset([])

Set of capabilities supported by this plugin. Useful capabilities are: ‘identify’, ‘cover’

touched_fields = frozenset([])

List of metadata ﬁelds that can potentially be download by this plugin during the identify phase

has_html_comments = False

Set this to True ifyour plugin returns HTML formatted comments

supports_gzip_transfer_encoding =False

Setting this to True means that the browser object will add Accept-Encoding: gzipto all requests. This can

speedup downloads but make sure that the source actually supports gzip transfer encoding correctly ﬁrst

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