jellyfin-smart-playlist/README.md

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# Jellyfin SmartPlaylist Plugin
Smart playlists with Lisp filter engine.
This readme contains instructions for the most recent changes in
the development branch (`main`). To view the file appropriate
for your version select the tag corresponding to your version.
The latest version is [v0.3.0.0](https://gitea.redxef.at/redxef/jellyfin-smart-playlist/src/tag/v0.3.0.0).
## How to use
After [installing](#installation) the plugin and restarting Jellyfin
create a empty file in `config/data/smartplaylists` like this, maybe
you want to generate a playlist of your favourite rock songs:
```
$ touch config/data/smartplaylists/Rock.yaml
```
Afterwards run the Task `(re)generate Smart Playlists`, this will rename
the `yaml` file and populate it with some default values. You can now
adjust the file to your liking. [Go here](examples.md) to see more
examples.
```yaml
Id: Rock
Playlists:
- PlaylistId: 24f12e1e-3278-d6d6-0ca4-066e93296c95
UserId: 6eec632a-ff0d-4d09-aad0-bf9e90b14bc6
Name: Rock
Program: (begin (invoke item "IsFavoriteOrLiked" (user)))
SortProgram: (begin items)
Filename: /config/data/smartplaylists/Rock.yaml
Enabled: true
```
This is the default configuration and will always match all your
favorite songs (and songs which are in favourited albums).
To change the filter you can append a `|` (pipe) to the Program
line and write multiline filters like this:
```yaml
Porgram: |
(begin
(invoke item "IsFavoriteOrLiked" (list user)))
```
This is equivalent to the above example (not counting the other
fields obviously).
### Id
Arbitrary Id assigned to this playlist, can usually be left alone.
### Playlists
A list of Playlist/User mappings. By default all users get an entry.
The ids must have the dashes in them as of now. To convert a id
from without dashes to the canonical form run this command:
`echo '<your id here>' | python3 -c 'import uuid; import sys; print(uuid.UUID(sys.stdin.read().strip()))'`
To get your user id navigate to your user profile and copy the part
after `userId` in the address bar.
#### PlaylistId
The id of the playlist that should be managed, must be owned by the
corresponding user.
#### UserId
The user associated with this playlist.
### Name
The name of the generated playlists, this is just a default value.
If the user changes the name of their playlist the plugin will
still work and remember the correct playlist.
### Program
A lisp program to decide on a per item basis if it should be included in
the playlist, return `nil` to not include items, return any other value
to include them. Global variables `user` and `item` are predefined
and contain a [User](https://github.com/jellyfin/jellyfin/blob/master/Jellyfin.Data/Entities/User.cs) and
[BaseItem](https://github.com/jellyfin/jellyfin/blob/master/MediaBrowser.Controller/Entities/BaseItem.cs)
respectively.
**!!! The filter expression will include all items matching, if you do
not specify the kind of item to include/exclude all of them will be
added. Should you allow a playlist to be included all of it's items
will be added to the generated playlist !!!**
It's best to be explicit and always specify the item kinds you want to
include: `(and (or (is-type "MusicAlbum") (is-type "Audio")) . rest of filter)`.
The configuration page defines some useful functions to make it easier
to create filters. The above filter for liked items could be simplified
to: `(is-favourite)`.
### SortProgram
This works exactly like [Program](#program), but the input is the
user and a list of items (`items`) matched by [Program](#program).
The default is `(begin items)`, which doesn't sort at all. To sort
the items by name you could use the following program:
```lisp
(qsort
(lambda
(a b)
(string>
(car (getitems a "Name"))
(car (getitems b "Name"))))
items)
```
#### Available definitions
- **lower**: lowercases a string (`(eq (lower "SomeString") "somestring")`)
- **is-genre**: check if the item is of this genre, partial matches
allowed, the example filter would match the genre "Nu-Metal" (`(is-genre "metal" (genre-list))`)
- **is-genre-exact**: the same as `is-genre`, but does not match paritally
- **is-favorite**: matches a favorite item (`(is-favorite)`)
- **is-type**: matches the type of item look at
[BaseItemKind.cs](https://github.com/jellyfin/jellyfin/blob/master/Jellyfin.Data/Enums/BaseItemKind.cs)
for a list of items. The plugin has enabled support for `Audio, MusicAlbum, Playlist` (`(is-type "Audio")`)
### Filename
The path to this file, only used internally and updated by the program.
### Enabled
Enable this playlist, currently ignored.
## Installation
Add the [plugin repository](https://jellyfin.org/docs/general/server/plugins/#catalog)
to Jellyfin:
`https://gitea.redxef.at/redxef/jellyfin-smart-playlist/raw/branch/manifest/manifest.json`
Go to `Dashboard>Catalog>(Gear)>(Plus)` and paste the provided link into
the field labeled `Repository URL`, give the plugin a descriptive name
too.
## Releasing a new version
1. Write the changelog: `git log --oneline $prev_version..`
2. Update the following files to include up-to-date version numbers
and changelogs, if applicable:
- `README.md`
- `Jellyfin.Plugin.SmartPlaylist/build.yaml`
- `Jellyfin.Plugin.SmartPlaylist/jellyfin-smart-playlist.csproj`
Don't forget to also bump the ABI version of Jellyfin.
3. Push the changes
4. Create a new release with the changelog, mark as pre-release if
applicable.
5. Done! The build pipeline will do the rest.