owntone-server/README_SMARTPL.md

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# forked-daapd smart playlists
To add a smart playlist to forked-daapd, create a new text file with a filename ending with .smartpl;
the filename doesn't matter, only the .smartpl ending does. The file must be placed somewhere in your
library folder.
## Syntax
The contents of a smart playlist must follow the syntax:
```
"Playlist Name" { expression }
```
There is exactly one smart playlist allowed for a .smartpl file.
An expression consists of:
```
field-name operator operand
```
Where valid field-names (with there types) are:
* artist (string)
* album_artist (string)
* album (string)
* title (string)
* genre (string)
* composer (string)
* path (string)
* type (string)
* grouping (string)
* data_kind (enumeration)
* media_kind (enumeration)
* play_count (integer)
* rating (integer)
* year (integer)
* compilation (integer)
* time_added (date)
* time_modified (date)
* time_played (date)
Valid operators include:
* is, includes (string)
* >, <, <=, >=, = (int)
* after, before (date)
* is (enumeration)
The "is" operator must exactly match the field value, while the "includes" operator matches a substring.
Both matches are case-insensitive.
Valid operands include:
* "string value" (string)
* integer (int)
Valid operands for the enumeration "data_kind" are:
* file
* url
* spotify
* pipe
Valid operands for the enumeration "media_kind" are:
* music
* movie
* podcast
* audiobook
* tvshow
Multiple expressions can be anded or ored together, using the keywords OR and AND. The unary not operator is also supported using the keyword NOT.
Examples:
```
"techno" {
genre includes "techno"
and artist includes "zombie"
}
```
This would match songs by "Rob Zombie" or "White Zombie", as well as those with a genre of "Techno-Industrial" or
"Trance/Techno", for example.
```
"techno 2015" {
genre includes "techno"
and artist includes "zombie"
and not genre includes "industrial"
}
```
This would exclude e. g. songs with the genre "Techno-Industrial".
```
"Local music" {
data_kind is file
and media_kind is music
}
```
This would match all songs added as files to the library that are not placed under the folders for podcasts, audiobooks.
```
"Unplayed podcasts and audiobooks" {
play_count = 0
and (media_kind is podcast or media_kind is audiobook)
}
```
This would match any podcast and audiobook file that was never played with forked-daapd.
## Date operand syntax
One example of a valid date is a date in yyyy-mm-dd format:
```
"Files added after January 1, 2004" {
time_added after 2004-01-01
}
```
There are also some special date keywords:
* "today", "yesterday", "last week", "last month", "last year"
A valid date can also be made by applying an interval to a date. Intervals can be defined as "days", "weeks", "months", "years".
As an example, a valid date might be:
```3 weeks before today``` or ```3 weeks ago```
Examples:
```
"Recently Added" {
time_added after 2 weeks ago
}
```
This matches all songs added in the last 2 weeks.
```
"Recently played audiobooks" {
time_played after last week
and media_kind is audiobook
}
```
This matches all audiobooks played in the last week.
## Differences to mt-daapd smart playlists
The syntax is really close to the mt-daapd smart playlist syntax (see
http://sourceforge.net/p/mt-daapd/code/HEAD/tree/tags/release-0.2.4.2/contrib/mt-daapd.playlist).
Even this documentation is based on the file linked above.
Some differences are:
* only one smart playlist per file
* the not operator must be placed before an expression and not before the operator
* "||", "&&", "!" are not supported (use "or", "and", "not")
* comments are not supported