Command-line tool to generate EPUB files for J-Novel Club pre-pub novels
Project description
jncep
Command-line tool to generate EPUB files for J-Novel Club pre-pub novels
Install
The tool requires Python 3.6+.
To install, launch :
pip install jncep
The command above will install the jncep
Python library and its dependencies. The library includes a command-line script, also named jncep
, whose functionality is described below.
Limitations & disclaimer
This tool only works with J-Novel Club novels, not manga.
jncep
is completely unaffiliated with J-Novel Club (it simply uses their API).
Issues
Report issues at https://github.com/gvellut/jncep/issues
Usage
The jncep
tool must be launched on the command-line. It has 4 commands:
epub
: To simply generate an EPUB filetrack
: To tell the tool that a series is of interestupdate
: To generate EPUB files for newly updated series of interestconfig
: To manage an optional configuration file
J-Novel Club account credentials
All the commands need some user credentials (email and password) in order to communicate with the J-Novel Club API. They are the same values as the ones used to log in to the J-Novel Club website with a browser (unless Sign in with Google or Sign in with Facebook is used: In that case, see the section just below).
Those credentials can be passed directly on the command line using the --email
and --password
arguments to the command (or subcommand for track
), not the jncep
tool directly. For example, using the epub
command:
jncep epub --email user@example.com --password "foo%bar666!" https://j-novel.club/series/tearmoon-empire
Passing the credentials indirectly
It is also possible to pass the credentials indirectly in one of 2 ways:
- configuration file
- environment variables
Then it is possible to omit the --email
and --password
options.
In order to make them more readable, all the examples in the rest of this documentation will assume that the credentials have been passed through one of the two methods above.
Configuration file
It is possible to set the login and password using the configuration file:
jncep config set EMAIL "user@example.com"
jncep config set PASSWORD "foo%bar666!"
Then, the same command as above can be simply launched as follows:
jncep epub https://j-novel.club/series/tearmoon-empire
See the general documentation on managing the configuration.
Environment variables
Optionally, the JNCEP_EMAIL and JNCEP_PASSWORD env vars can be set instead of passing the --email
and --password
arguments when launching the commands. For example, if they are set in the .bashrc in the following way:
export JNCEP_EMAIL=user@example.com
export JNCEP_PASSWORD="foo%bar666!"
Then, the same command as above can be simply launched as follows:
jncep epub https://j-novel.club/series/tearmoon-empire
See the general documentation on environment variables.
Credentials when signing in at J-Novel Club with Google or Facebook
It is not possible to directly use Google credentials (if Sign in with Google is used on the J-Novel Club website) or Facebook credentials (with Sign in with Facebook). Instead, a password specific to J-Novel Club must first be created: It is the same process as the one needed to be performed in order to log in to the official J-Novel Club mobile app, in case Google or Facebook was originally used to sign up.
Here is what needs to be done:
- Log in to the J-Novel Club website with Facebook or Google
- Go to the Account page from the link at the top.
- Click on the Password section on the left hand side.
- Set a password on that screen.
Then the login email of the Facebook or Google account, together with that new password, can be used as credentials for the jncep
tool, either directly or using one of the indirect methods.
Debugging mode
A --debug
(or -d
) option can be passed to the jncep
tool, before the specific command. It will print out more information about what is happening, using the standard Python logging
package.
For example:
jncep --debug update
In case of an issue with jncep
, it is recommended to launch with the --debug
option and to include the output in the issue report (either inline or as a file attachment, if too long).
epub
The epub
command is used for simple EPUB generation, based on a URL link to a part or volume or series on the J-Novel Club website.
Options
To get some help about the arguments to the epub
command, just launch with the --help
option:
~$ jncep epub --help
Usage: jncep epub [OPTIONS] JNOVEL_CLUB_URL
Generate EPUB files for J-Novel Club pre-pub novels
Options:
-l, --email TEXT Login email for J-Novel Club account [required]
-p, --password TEXT Login password for J-Novel Club account [required]
-o, --output DIRECTORY Existing folder to write the output [default: The
current directory]
-s, --parts TEXT Specification of a range of parts to download in the
form of <vol>[.part]:<vol>[.part] [default: All the
content linked by the JNOVEL_CLUB_URL argument,
either a single part, a whole volume or the whole
series]
-v, --byvolume Flag to indicate that the parts of different volumes
should be output in separate EPUBs
-i, --images Flag to indicate that the images of the novel should
be extracted into the output folder
-c, --content Flag to indicate that the raw content of the parts
should be extracted into the output folder
-n, --no-replace Flag to indicate that some unicode characters
unlikely to be in an EPUB reader font should NOT be
replaced and instead kept as is
-t, --css FILE Path to custom CSS file for the EPUBs [default: The
CSS provided by JNCEP]
--help Show this message and exit.
Examples
Basic usage
The following command will create a single EPUB file of part 1 of Volume 1 of the 'Tearmoon Empire' novel in the specified .../jncbooks
directory:
jncep epub -o /Users/guilhem/Documents/jncbooks https://j-novel.club/read/tearmoon-empire-volume-1-part-1
Account credentials must be passed (in this case, by using the env vars, as explained above), as well as a URL link to a part or volume or series on the J-Novel Club website. Whatever the URL links to is downloaded (single part or whole volume or whole series).
The tool will then communicate with the J-Novel Club API using the specified credentials and download the necessary parts (texts and images), as well as a book cover. The EPUB file will be created inside the specified (optional) output directory, /Users/guilhem/Documents/jncbooks
. The directory will be created if it doesn't exist.
If the --output
or -o
switch is not present, the EPUB is output in the current directory. The JNCEP_OUTPUT
env var can also be used instead of the switch to indicate a download directory.
URL
To get the URL to pass as argument, you should first go to the series page on the the J-Novel Club website. Then copy the URL found in the browser URL bar:
- For series: Simply use the URL of the series page on J-Novel Club. It will have a shape like
https://j-novel.club/series/redefining-the-meta-at-vrmmo-academy
. - For volumes: Click on the volume you are interested in. The URL in the browser will change to something like
https://j-novel.club/series/redefining-the-meta-at-vrmmo-academy#volume-2
. - For parts: Click on one of the available parts below a specific volume. The web reader will then open and the URL will be something like
https://j-novel.club/read/redefining-the-meta-at-vrmmo-academy-volume-1-part-1
.
It is also possible to pass the index of the series shown using the track list
command:
jncep epub 5
It is equivalent to passing the URL of the corresponding series.
Range of parts
The following command will create a single EPUB file with Parts 5 to 10 of Volume 1 of the 'Tearmoon Empire' novel (as long as the pre-pubs have not expired) in the current directory:
jncep epub --parts 1.5:1.10 https://j-novel.club/read/tearmoon-empire-volume-1-part-1
Compared to the previous example, a range of parts / volumes has been specified, in which case the URL is simply used to indicate the series (even if it is a link to just a part or volume of a series).
The specified range is in the shape of <volume>[.<part>]:<volume>[.<part>]
where <volume>
and <part>
are numbers (e.g. 1.5:3
). The specific part numbers are optional (as indicated by [
and ]
, which should not be present in the actual argument value) and are relative to the volume. If the part number is not specified, it is equivalent to <volume>.1
if on the left and, if on the right, until the last part of the volume. Both sides of the range are inclusive.
Any of the 2 sides of the :
range separator is optional, like <volume>[.<part>]:
, which means 'every part starting with the specified part until the last in the series', or even :
, which means 'every part in the series'.
Moreover, the :
itself is also optional: It is possible to specify just <volume>[.<part>]
, in which case it is not interpreted as a range. If only the volume is specified (e.g. 2
), then all the parts of the volume will be downloaded and if there is also a part (e.g. 2.1
), only that part will be downloaded.
Here are examples of valid values for the argument:
1.5:2.8
=> Part 5 of volume 1 to part 8 of volume 21:2.8
=> Part 1 of volume 1 to part 8 of volume 21:3
=> Part 1 of volume 1 to the last part of volume 32.7:
=> Part 7 of volume 2 until the last part in the series:3.5
=> From the first part in the series until part 5 of volume 3-1
=> The last volume-1.3:
=> From the third part of the last volume until the last part in the series:
=> The whole series2
=> All the parts of volume 2
A note about volume numbers
The volume number used in the --parts
option is the one used by J-Novel Club internally, for its website and API. For most series, it is identical to the volume number as written in the volume sections on the series pages of the J-Novel Club website: Volume 7 means 7
can be passed to the --parts
option.
However, for some series, the volume numbering scheme is different. For example:
- The volumes of Ascendance of a Bookworm are written as Part x Volume y. However, internally, J-Novel Club still uses a single number to describe a volume for this series.
- Min-Maxing My TRPG Build has Volume 4 Canto I and Volume 4 Canto II. Internally, J-Novel Club describes the first as volume
4
and the second as volume5
. - There are also some series with a side-stories volume that has been inserted in the normal series but which doesn't follow the volume numbering scheme: This volume will shift the internal numbering for the volumes that come after.
In order to get the volume number to use for the --parts
option for those series, you should go to the series page on J-Nobel Club, then click on the volume you want. Then the URL in the brower will change with #volume-xx
added at the end. This number xx
can be used for jncep
. For example, for Ascendance of a Bookworm Part 4 Volume 8, the URL in the browser will change to https://j-novel.club/series/ascendance-of-a-bookworm#volume-20
. It means you should use 20
as the volume number for the command.
Alternatively, a negative volume counts from the last volume: -1
is the last volume, -2
the penultimate, etc ... So it might be easier to use that for series with many volumes and with an internal numbering that doesn't correspond to the external one.
Rare Unicode characters
Originally, the tool copied into the EPUB the text obtained from J-Novel Club as is. Depending on the font used by the ePub reader, some rare Unicode characters did not display. I noticed it in a series where the string used as the scene separator is ♱ (East Syriac Cross): My Kobo eBook reader would not show it with any of the fonts present on the device. Using Crimson Text, the font used by J-Novel Club for its web reader, gave the same result. It turns out it was only rendered in the web reader by a fallback font, which on my Mac is Menlo (a monospace font by Apple). This issue also happened with the Calibre EPUB reader. However, the iBooks reader app on macOS displayed the character.
To solve this issue (without having to mess with fonts), by default, this specific character is now replaced with "**". This behaviour can be overridden with the -n
switch. Both the characters to replace and the replacement string are hardcoded. If another character is unable to display properly, an issue can be filed and it will be processed by the tool in a later version.
CSS
The default CSS used by the tool and embedded in the generated EPUB files can be found in the repository. It is possible to download it and customize it. Then you can tell the epub
command to use your own version by passing the -t/--css
option with the path to your custom CSS as value.
Configuration file
Just like the login and password, other options can be set in a configuration file. Here are the options that are used by the epub
subcommand (and also by update
):
- PASSWORD
- OUTPUT
- CSS
- BYVOLUME
- IMAGES
- CONTENT
- NOREPLACE
To set an option, use the jncep config set
command. For example:
jncep config set OUTPUT "/user/gvellut/documents/jncepubs"
This will add a value for the OUTPUT configuration option. When the jncep epub
command is run, the value of the --output
option will be taken from the configuration file, unless the --output
option is actually present on the command-line, in which case it will take priority.
Note: For OUTPUT
or CSS
, the values of which should be file paths, the jncep config set
command doesn't process the ~
(user HOME directory, usually expanded by the shell) nor resolves a relative path to an absolute one. The output of the command will show what exact value will be used later by the epub
and update
commands: No additional transformation will be performed.
See the paragraph about managing the configuration further in this page.
Flags
The options that set flags (BYVOLUME and below in the list above) should have one of the following values: 1
, true
, t
, yes
, y
or on
. The value can be in upper case.
For unsetting, the simplest is to use config unset
to remove the configuration option (the default value for all those flags is False
). If a value is set, it should be one of the following: 0
, false
, f
, no
, n
or off
.
Environment variables
The options can also be set using environment variables. They are the same as the configuration options, but with a JNCEP_
prefix:
For example:
- JNCEP_PASSWORD
- JNCEP_OUTPUT
- JNCEP_CSS
- and so on ...
The specifig way of setting them will depend on your shell. For example, with Bash:
export JNCEP_BYVOLUME=1
The names of the environment variables are case-sensitive.
Priority order for option values
The priority order for option values is as follows:
- If a value is passed on the command-line, it has the highest priority
- If no value is passed, the value is taken from an environment variable if present
- After that, the value is taken from the configuration file
- Some options have a default value defined in the code: If no value has been explicitly passed using one of the 3 methods above, that default value will be used. Some options have no default values and are instead required: If no value is passed using one of the 3 methods just described, an error will be raised.
track
This command is used to manage series to track. It has 4 subcommands:
add
: Add a new series for tracking. After a series has been added, it can be updated using theupdate
command.rm
: Remove a series from trackinglist
: List tracked seriesync
: Update the list of series to track based on series followed on the J-Novel Club website (or the opposite using the--reverse
flag)
In the cases of add
and rm
, a URL link to a part or volume or series on the J-Novel Club website must be passed and is used to specify the series. Credentials are also needed for them (but not for list
, which doesn't communicate with the J-Novel Club API).
Tracking configuration
The tracking is performed by updating a local config file called tracked.json
and located inside the configuration folder. The location of the folder will vary depending on the OS. See the section dedicated to the configuration for more details.
The configuration folder, as well the tracked.json
file will be created by the tool if they don't exist.
The tracked.json
file can be updated manually with a text editor if really needed but should generally be left alone (or jncep
could malfunction).
Options
To get some help about the arguments to the track
command, just launch with the --help
option:
~$ jncep track --help
Usage: jncep track [OPTIONS] COMMAND [ARGS]...
Track updates to a series
Options:
--help Show this message and exit.
Commands:
add Add a new series for tracking
list List tracked series
rm Remove a series from tracking
sync Sync list of series to track based on series followed on J-Novel...
In turn, the add
, rm
, list
and sync
subcommands can be called with --help
to get details about their arguments.
Examples
Tracking
The add
subcommand sets up tracking for a series by passing a URL to either the series, a volume or a part:
jncep track add https://j-novel.club/series/tearmoon-empire
An entry with key https://j-novel.club/series/tearmoon-empire
will be added to the tracked.json
file. Note that no Epub is generated by this command: Use the epub
command to generate a file for the parts released until now.
Untracking
The rm
subcommand disables tracking for a specific series by passing a URL, for example for "Tearmoon Empire" that was added above:
jncep track rm https://j-novel.club/read/tearmoon-empire-volume-1-part-14
Note that the URL is different from before: It doesn't matter since it actually resolves to the same series.
It is also possible to pass the index of the series shown using the list
subcommand (see below):
jncep track rm 5
List tracked series
The list
subcommand lists the tracked series:
jncep track list --details
This will display something like:
16 series are tracked:
[1] A Late-Start Tamer’s Laid-Back Life https://j-novel.club/series/a-late-start-tamer-s-laid-back-life 2.5 [Nov 04, 2021]
[2] Ascendance of a Bookworm https://j-novel.club/series/ascendance-of-a-bookworm 16.6 [Nov 08, 2021]
...
That subcommand doesn't need a login or password (it only reads the local tracked.json
file).
Withouth the --details
option, only the index and the series titles are shown.
The index inside the [..]
can be used in the rm
subcommand instead of the URL, as well as the epub
command.
Sync
Using the sync
subcommand, track
will update the list of series tracked by jncep
based on series followed on the J-Novel Club website:
jncep track sync
The --reverse
flag can be used for the opposite: The list of series followed on the J-Novel Club website will be updated to add series that are tracked locally by the jncep
tool.
By default, the sync
subcommand doesn't do any deletion, it just adds missing entries. To make the list of tracked series and followed series identical, the --delete
flag can be passed.
update
This command is used to generate EPUB files for newly updated series that were previously added using the track
command. Optionally, a URL link to a part or volume or series on the J-Novel Club website can be passed, in order to only update that series.
This command uses the launch date of the parts to find out if the series has been updated.
Options
To get some help about the arguments to the update
command, just launch with the --help
option:
~$ jncep update --help
Usage: jncep update [OPTIONS] (JNOVEL_CLUB_URL?)
Generate EPUB files for new parts of all tracked series (or specific series
if a URL argument is passed)
Options:
-l, --email TEXT Login email for J-Novel Club account [required]
-p, --password TEXT Login password for J-Novel Club account [required]
-o, --output DIRECTORY Existing folder to write the output [default: The
current directory]
-v, --byvolume Flag to indicate that the parts of different volumes
should be output in separate EPUBs
-i, --images Flag to indicate that the images of the novel should
be extracted into the output folder
-c, --content Flag to indicate that the raw content of the parts
should be extracted into the output folder
-n, --no-replace Flag to indicate that some unicode characters
unlikely to be in an EPUB reader font should NOT be
replaced and instead kept as is
-t, --css FILE Path to custom CSS file for the EPUBs [default: The
CSS provided by JNCEP]
-s, --sync Flag to sync tracked series based on series followed
on J-Novel Club and update the new ones from the
beginning of the series
-j, --jnc-managed Flag to indicate whether to use the series followed
on the J-Novel Club website as the tracking
reference for updating (equivalent to running 'track
sync --delete --beginning' followed by 'update')
-w, --whole Flag to indicate whether the whole volume should be
regenerated when a new part is detected during the
update
-f, --whole-final Flag to indicate whether an EPUB with a complete
volume should also be generated when the final part
of the volume is included in the update
-e, --use-events Flag to use the events feed to check for updates
--help Show this message and exit.
Most of the arguments to the epub
command are also found here.
Example
The following command will update all the series:
jncep update
Depending on which series were configured, something like the following should be displayed on the last line:
2 series sucessfully updated!
Or if no tracked series has seen any updates:
All series are already up to date!
Sync
The --sync
flag can be passed (together with the other options), in which case the list of tracked series is first updated based on the list of followed series on the J-Novel Club website (equivalent of jncep track sync
), then, only for the newly added series, an EPUB is created with the parts from the beginning.
It can be useful for when a new series starts publishing: It can be set as Followed on the website then this jncep update --sync
command can be launched to subscribe to the series and get all the newly released parts in one go, and without having to copy/paste a URL.
Events feed
If you have a lot of followed series and update often, the flag --use-events
can be used. In that case, the update
command will first check the events feed provided by J-Novel Club: It includes all the part releases and can be used to know which series will need to be downloaded. With this flag, the tool saves time by not checking all the series individually.
Configuration & environment variables
Compared to the epub
command, the update
command understands the additional configuration options:
- USE_EVENTS
- WHOLE
- WHOLE_FINAL
- JNC_MANAGED
Since they are flags, they should have a value like 1
, true
, t
, yes
, y
or on
(case insensitive) if set.
They are also available as environment variables:
- JNCEP_USE_EVENTS
- JNCEP_WHOLE
- JNCEP_WHOLE_FINAL
- JNCEP_JNC_MANAGED
Automation
The update
command can be called in the background from launchd (on macOS) or a scheduled task (on Windows) or cron (on Linux) in order to regularly download new content if available and create EPUBs (for example, once a day).
There is no notification built in the jncep update
command but the text output can be combined with other tools to make something suitable. If there are updates, the jncep update
command outputs something like 2 series sucessfully updated!
, which can be processed by another tool do create a notification.
config
This command is used to manage configuration options, as an alternative to passing values on the command line or through environment variables.
It has 6 subcommands:
show
: Show some general info about the configuration (folder, actual configuration files, configuration values)list
: Show available options that can be setset
: Set the value of an optionunset
: Unset an optioninit
: Create an emptyconfig.ini
file (for manual editing)migrate
: Migrate configuration files to the post-v41 configuration folder
The configuration options are stored inside a config.ini
file in the configuration folder. The file essentially uses the .ini
file format for properties, except it doesn't support the [...]
headers. When using the set
command, the file will be created if needed.
Options
To get some help about the config
command, just launch with the --help
option:
~$ jncep config --help
Usage: jncep config [OPTIONS] COMMAND [ARGS]...
Manage configuration
Options:
--help Show this message and exit.
Commands:
init Create configuration file
list List configuration options
migrate Migrate to standard configuration folder...
set Set configuration option
show List configuration details
unset Delete configuration option
In turn, the subcommands can be called with --help
to get details about their arguments.
Configuration folder
The configuation files are located inside the configuration folder that is either:
/Users/<user>/Library/Application Support/jncep
on macOSC:\Users\<user>\AppData\Roaming\jncep
on Windows/home/<user>/.config/jncep
on Linux
Note: On jncep v41
and before, the configuration folder was created at <HOME>/.jncep
(where <HOME>
is either /Users/<user>
on macOS, C:\Users\<user>
on Windows or /home/<user>
on Linux). If the folder was created at that location because such a version was previously used, it will stay there and jncep
should keep working even if you update to a later version. The command config migrate
can be used for migrating to the new location. The command config show
can be used to make sure of the location of the configuration folder.
The folder contains both the tracked.json
file used by the track
and update
commands, as well as the config.ini
file that contains general configuration values used by all commands.
show
The show
subcommand shows some general info about the configuration:
jncep config show
This will display something like:
Configuration folder: C:\Users\gvellut\AppData\Roaming\jncep
Found config file: config.ini
Option: OUTPUT => output_test2
Option: BYVOLUME => Y
Found tracking file: tracked.json
13 series tracked
list
The list
subcommand shows available options that can be set:
jncep config list
This will display something like:
BYVOLUME Flag to indicate that the parts of
different volumes should be output in
separate EPUBs
CONTENT Flag to indicate that the raw content of
the parts should be extracted into the
output folder
CSS Path to custom CSS file for the EPUBs
EMAIL Login email for J-Novel Club account
...
The same options can be set using environment variables (except there is a JNCEP_
prefix).
set
The set
subcommand can be used to set the value for a configuration option:
jncep config set EMAIL "jnclogin@aol.com"
The option names are case-insensitive so it could also be written as:
jncep config set email "jnclogin@aol.com"
This will display something like:
Option 'EMAIL' set to 'jnclogin@aol.com'
The config.ini
file will be created if needed and will contain the following line:
EMAIL = jnclogin@aol.com
Warning: When using that command from the command-line, the shell may need some characters to be escaped. The rules vary depending on what shell is used. Also, for OUTPUT
or CSS
, the command doesn't process the ~
(user HOME directory, usually expanded by the shell) nor resolves a relative path to an absolute one. Please review the output to check if the option was set as intended.
An alternative to using this command (as well as unset
) is to edit the config.ini
file with a text editor. The file must be saved in the UTF-8 encoding.
unset
The unset
subcommand can be used to remove a configuration option:
jncep config unset OUTPUT
It will display something like:
Option 'OUTPUT' unset
This will delete the OUTPUT
option from the configuration file.
init
The init
subcommand creates an empty config.ini
file:
jncep config init
This will display something like:
New empty config file created: C:\Users\gvellut\AppData\Roaming\jncep\config.ini
Then the file can be edited manually (or using the set
and unset
commands). After editing, the file must be saved using the UTF-8 encoding.
migrate
The migrate
subcommand can be used to migrate configuration files to the post-v41 standard configuration folder:
jncep config migrate
This will display something like:
The configuration is now in: C:\Users\gvellut\AppData\Roaming\jncep
You may delete: C:\Users\gvellut\.jncep
It creates the new folder and performs a simple copy of the files present in the old directory.
Note: jncep
will keep functioning with the <HOME>/.jncep
folder so it is not actually necessary to run this command.
TODO (maybe)
- self-contained executable for macOS and Windows with PyInstaller
- simple GUI
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