# sldl

An automatic downloader for Soulseek built with Soulseek.NET. Accepts CSV files as well as Spotify and YouTube urls.  
Supports playlist and album downloads; selects the best files according to user-configured file conditions and heuristics.

See the [usage examples](#examples-1).

## Index
 - [Options](#options)
 - [Input types](#input-types)
   - [CSV file](#csv-file)
   - [YouTube](#youtube)
   - [Spotify](#spotify)
   - [Bandcamp](#bandcamp)
   - [Search string](#search-string)
   - [List](#list)
 - [Download modes](#download-modes)
   - [Normal](#normal)
   - [Album](#album)
   - [Aggregate](#aggregate)
   - [Album Aggregate](#album-aggregate)
 - [Searching](#searching)
 - [File conditions](#file-conditions)
 - [Name format](#name-format)
 - [Configuration](#configuration)
 - [Examples](#examples-1)
 - [Notes](#notes)
 - [Docker](#docker)


## Options

```
Usage: sldl <input> [OPTIONS]
```
#### Required Arguments
```
    <input>                        A url, search string, or path to a local CSV file.
                                   Run --help "input" to view the accepted inputs.
                                   Can also be passed with -i, --input <input>
    --user <username>              Soulseek username
    --pass <password>              Soulseek password
```
#### General Options
```
    -p, --path <path>              Download directory
    --input-type <type>            [csv|youtube|spotify|bandcamp|string|list]
    --name-format <format>         Name format for downloaded tracks. See --help name-format
        
    -n, --number <maxtracks>       Download the first n tracks of a playlist
    -o, --offset <offset>          Skip a specified number of tracks
    -r, --reverse                  Download tracks in reverse order
    -c, --config <path>            Set config file location. Set to 'none' to ignore config
    --profile <names>              Configuration profile(s) to use. See --help ""config"".
    --concurrent-downloads <num>   Max concurrent downloads (default: 2)
    --write-playlist               Create an m3u playlist file in the output directory
    --playlist-path <path>         Override default path for m3u playlist file

    --no-skip-existing             Do not skip downloaded tracks
    --no-write-index               Do not create a file indexing all downloaded tracks
    --index-path <path>            Override default path for sldl index
    --skip-check-cond              Check file conditions when skipping existing files
    --skip-check-pref-cond         Check preferred conditions when skipping existing files  
    --skip-music-dir <path>        Also skip downloading tracks found in a music library by
                                   comparing filenames. Not 100% reliable.
    --skip-not-found               Skip searching for tracks that weren't found on Soulseek
                                   during the last run.
        
    --listen-port <port>           Port for incoming connections (default: 49998)
    --on-complete <command>        Run a command whenever a file is downloaded.
                                   Available placeholders: {path} (local path),{title},{row}
                                   {artist},{album},{uri},{length},{failure-reason},{state}.
                                   Prepend a state number to only run in specific cases:
                                   1:, 2:, 3:, 4: for the Downloaded, Failed, Exists, and
                                   NotFoundLastTime states respectively. 
                                   E.g: '1:<cmd>' will only run the command if the file is
                                   downloaded successfully. Prepend 's:' to use the system
                                   shell to execute the command. Prepend 'a:' to run it only
                                   on album downloads.

    --print <option>               Print tracks or search results instead of downloading:
                                   'tracks': Print all tracks to be downloaded
                                   'tracks-full': Print extended information about all tracks
                                   'results': Print search results satisfying file conditions
                                   'results-full': Print search results including full paths.
    --no-progress                  Disable progress bars/percentages, only simple printing
    --debug                        Print extra debug info
```
#### Search Options
```
    --fast-search                  Begin downloading as soon as a file satisfying the preferred
                                   conditions is found. Only for normal download mode.
    --remove-ft                    Remove 'feat.' and everything after before searching
    --no-remove-special-chars      Do not remove special characters before searching
    --remove-brackets              Remove square brackets and their contents before searching
    --regex <regex>                Remove a regexp from all track titles and artist names.
                                   Optionally specify a replacement regex after a semicolon.
                                   Add 'T:', 'A:' or 'L:' at the start to only apply this to
                                   the track title, artist, or album respectively.
    --artist-maybe-wrong           Performs an additional search without the artist name.
                                   Useful for sources like SoundCloud where the "artist"
                                   could just be an uploader. Note that when downloading a
                                   YouTube playlist via url, this option is set automatically
                                   on a per-track basis, so it is best kept off in that case.
    -d, --desperate                Tries harder to find the desired track by searching for the
                                   artist/album/title only, then filtering. (slower search)
    --fails-to-downrank <num>      Number of fails to downrank a user's shares (default: 1)
    --fails-to-ignore <num>        Number of fails to ban/ignore a user's shares (default: 2)

    --yt-dlp                       Use yt-dlp to download tracks that weren't found on
                                   Soulseek. yt-dlp must be available from the command line.
    --yt-dlp-argument <str>        The command line arguments when running yt-dlp. Default:
                                   "{id}" -f bestaudio/best -cix -o "{savepath}.%(ext)s"
                                   Available vars are: {id}, {savedir}, {savepath} (w/o ext).
                                   Note that -x causes yt-dlp to download webms in case ffmpeg
                                   is unavailable.

    --search-timeout <ms>          Max search time in ms (default: 6000)
    --max-stale-time <ms>          Max download time without progress in ms (default: 50000)
    --searches-per-time <num>      Max searches per time interval. Higher values may cause
                                   30-minute bans, see --help "search". (default: 34)
    --searches-renew-time <sec>    Controls how often available searches are replenished.
                                   See --help "search". (default: 220)
```
#### Spotify Options
```
    --spotify-id <id>              Spotify client ID
    --spotify-secret <secret>      Spotify client secret
    --spotify-token <token>        Spotify access token
    --spotify-refresh <token>      Spotify refresh token
    --remove-from-source           Remove downloaded tracks from source playlist
```
#### YouTube Options 
```
    --youtube-key <key>            Youtube data API key
    --get-deleted                  Attempt to retrieve titles of deleted videos from wayback
                                   machine. Requires yt-dlp.
    --deleted-only                 Only retrieve & download deleted music.
```
#### CSV File Options
```
    --artist-col                   Artist column name
    --title-col                    Track title column name
    --album-col                    Album column name
    --length-col                   Track length column name
    --album-track-count-col        Album track count column name (sets --album-track-count)
    --yt-desc-col                  Youtube description column (improves --yt-parse)
    --yt-id-col                    Youtube video id column (improves --yt-parse)

    --time-format <format>         Time format in Length column of the csv file (e.g h:m:s.ms
                                   for durations like 1:04:35.123). Default: s
    --yt-parse                     Enable if the CSV contains YouTube video titles and channel
                                   names; attempt to parse them into title and artist names.
    --remove-from-source           Remove downloaded tracks from source CSV file
```
#### File Condition Options
```
    --format <formats>             Accepted file format(s), comma-separated, without periods
    --length-tol <sec>             Length tolerance in seconds
    --min-bitrate <rate>           Minimum file bitrate
    --max-bitrate <rate>           Maximum file bitrate
    --min-samplerate <rate>        Minimum file sample rate
    --max-samplerate <rate>        Maximum file sample rate
    --min-bitdepth <depth>         Minimum bit depth
    --max-bitdepth <depth>         Maximum bit depth
    --strict-title                 File name must contain title
    --strict-artist                File path must contain artist name
    --strict-album                 File path must contain album name
    --banned-users <list>          Comma-separated list of users to ignore

    --pref-format <formats>        Preferred file format(s), comma-separated (default: mp3)
    --pref-length-tol <sec>        Preferred length tolerance in seconds (default: 3)
    --pref-min-bitrate <rate>      Preferred minimum bitrate (default: 200)
    --pref-max-bitrate <rate>      Preferred maximum bitrate (default: 2500)
    --pref-min-samplerate <rate>   Preferred minimum sample rate
    --pref-max-samplerate <rate>   Preferred maximum sample rate (default: 48000)
    --pref-min-bitdepth <depth>    Preferred minimum bit depth
    --pref-max-bitdepth <depth>    Preferred maximum bit depth
    --pref-banned-users <list>     Comma-separated list of users to downrank

    --strict-conditions            Skip files with missing properties instead of accepting by
                                   default; if --min-bitrate is set, ignores any files with
                                   unknown bitrate.
```
#### Album Download Options
```
    -a, --album                    Album download mode: Download a folder
    -t, --interactive              Interactive mode, allows to select the folder and images
    --album-track-count <num>      Specify the exact number of tracks in the album. Add a + or
                                   - for inequalities, e.g '5+' for five or more tracks.
    --album-art <option>           Retrieve additional images after downloading the album:
                                   'default': No additional images
                                   'largest': Download from the folder with the largest image
                                   'most': Download from the folder containing the most images
    --album-art-only               Only download album art for the provided album
    --no-browse-folder             Do not automatically browse user shares to get all files in
                                   in the folder
    --failed-album-path            Path to move all album files to when one of the items from
                                   the directory fails to download. Set to 'delete' to delete
                                   the files instead. Set to 'disable' keep it where it is.
                                   Default: {configured output dir}/failed
    --album-parallel-search        Run album searches in parallel, then download sequentially.
```
#### Aggregate Download Options
```
    -g, --aggregate                Aggregate download mode: Find and download all distinct
                                   songs associated with the provided artist, album, or title.
    --aggregate-length-tol <tol>   Max length tolerance in seconds to consider two tracks or
                                   albums equal. (Default: 3)
    --min-shares-aggregate <num>   Minimum number of shares of a track or album for it to be
                                   downloaded in aggregate mode. (Default: 2)
    --relax-filtering              Slightly relax file filtering in aggregate mode to include
                                   more results
```
### Notes
Acronyms of two- and --three-word-flags are also accepted, e.g. --twf. If the option
contains the word 'max' then the m should be uppercase. 'bitrate', 'sameplerate' and
'bitdepth' should be all treated as two separate words, e.g --Mbr for --max-bitrate.

Flags can be explicitly disabled by setting them to false, e.g '--interactive false'

## Input types

The input type is usually determined automatically. To force a specific input type, set
--input-type [spotify|youtube|csv|string|bandcamp|list]. The following input types are available:

###  CSV file
Path to a local CSV file: Use a csv file containing track info of the songs to download.
The names of the columns should be Artist, Title, Album, Length, although alternative names
are usually detected as well. Only the title or album column is required, but extra info may
improve search result ranking. Every row that does not have a title column text will be treated 
as an album download.

###  YouTube
A playlist url: Download songs from a youtube playlist.
The default method to retrieve playlists doesn't always return all videos, especially not
the ones which are unavailable. To get all video titles, you can use the official API by
providing a key with --youtube-key. Get it here https://console.cloud.google.com. Create a
new project, click "Enable Api" and search for "youtube data", then follow the prompts.

### Spotify
A playlist/album url or 'spotify-likes': Download a spotify playlist, album, or your
liked songs. Credentials are required when downloading a private playlist or liked music.

#### Using Credentials

<details>
  <summary>Click to expand</summary>

Create a Spotify application at https://developer.spotify.com/dashboard/applications with a redirect url http://localhost:48721/callback. Obtain an application ID and secret from the created application dashboard.

Start sldl with the obtained credentials and an authorized action to trigger the Spotify app login flow:

```
sldl spotify-likes --spotify-id 123456 --spotify-secret 123456 -n 1 --print-tracks
```
sldl will try to open a browser automatically but will fallback to logging the login flow URL to output. After login flow is complete sldl will output a token and refresh token and finish running the current command.

To skip requiring login flow every time sldl is used the token and refresh token can be provided to sldl (hint: store this info in the config file to make commands less verbose):

```
sldl spotify-likes --spotify-id 123456 --spotify-secret 123456 --spotify-refresh 123456 --spotify-token 123456 -n 1 --pt
```

spotify-token access is only valid for 1 hour. spotify-refresh will enable sldl to renew access every time it is run (and can be used without including spotify-token)
</details>

### Bandcamp
A bandcamp url: Download a single track, an album, or an artist's entire discography. 
Extracts the artist name, album name and sets --album-track-count="n+", where n is the 
number of visible tracks on the bandcamp page.

### Search string
Name of the track, album, or artist to search for: Can either be any typical search string
(like what you would enter into the soulseek search bar), or a comma-separated list of
properties like 'title=Song Name, artist=Artist Name, length=215'.

The following properties are accepted: title, artist, album, length (in seconds), 
artist-maybe-wrong, album-track-count.

Example inputs and their interpretations:
| Input String                            | Artist   | Title    | Album    | Length |
|-----------------------------------------|----------|----------|----------|--------|
| 'Foo Bar' (without any hyphens)         |          | Foo Bar  |          |        |
| 'Foo - Bar'                             | Foo      | Bar      |          |        |
| 'Foo - Bar' (with --album enabled)      | Foo      |          | Bar      |        |
| 'Artist - Title, length=42'             | Artist   | Title    |          | 42     |
| 'artist=AR, title=T, album=AL'          | AR       | T        | AL       |        |

### List
A path to a text file where each line has the following form:
```bash
# input                         conditions                    pref. conditions
"artist=Artist, album=Album"    "format=mp3; br > 128"        "br >= 320"
```
Where "some input" is any of the above input types. The quotes can be omitted if the field
contains no spaces. The condition fields are added on top of the
configured conditions and can also be omitted. List input must be manually activated with
--input-type=list.  
It also accepts a shorthand for album downloads: `a:"Artist - Album"`. Note that the `a:` must appear outside the quotes.

## Download modes

### Normal
  The default. Downloads a single file for every input entry.

### Album
  sldl will search for the album and download an entire folder including non-audio
  files. Activated when the input is a link to a spotify or bandcamp album, when the input
  string or csv row has no track title, or when -a/--album is enabled.

### Aggregate
With -g/--aggregate, sldl performs an ordinary search for the input then attempts to
group the results into distinct songs and download one of each kind, starting with the one
shared by the most users.  
Note that --min-shares-aggregate is 2 by default, which means that songs shared by only
one user will be ignored.

### Album Aggregate
Activated when both --album and --aggregate are enabled. sldl will group shares and download
one of each distinct album, starting with the one shared by the most users. It is
recommended to pair this with --interactive.  
Note that --min-shares-aggregate is 2 by default, which means that albums shared by only
one user will be ignored.


## Searching

### Search Query
The search query is determined as follows:

- For album downloads: If the album field is non-empty, search for 'Artist Album'.
  Otherwise, search for 'Artist Title'
- For all other download types: If the title field is non-empty, search for 'Artist Title'.
  Otherwise, search for 'Artist Album'

### Soulseek's rate limits
  The server will ban you for 30 minutes if too many searches are performed within a short
  timespan. The program has a search limiter which can be adjusted with --searches-per-time
  and --searches-renew-time (when the limit is reached, the status of the downloads will be
  "Waiting"). By default it is configured to allow up to 34 searches every 220 seconds.
  The default values were determined through experimentation, so they may be incorrect.

### Speeding things up
  The following options will make it go faster, but may decrease search result quality or cause
  instability:
  - --fast-search skips waiting until the search completes and downloads as soon as a file
    matching the preferred conditions is found
  - --concurrent-downloads - set it to 4 or more
  - --max-stale-time is set to 50 seconds by default, so it will wait a long time before giving
    up on a file
  - --searches-per-time - increase at the risk of bans
  - --album-parallel-search - enables parallel searching for album entries

## File conditions

Files not satisfying the required conditions will not be downloaded. Files satisfying pref-
conditions will be preferred; setting --pref-format "flac,wav" will make it download lossless
files if available, and only download lossy files if there's nothing else.

There are no default required conditions. The default preferred conditions are:
```
pref-format = mp3
pref-length-tol = 3
pref-min-bitrate = 200
pref-max-bitrate = 2500
pref-max-samplerate = 48000
pref-strict-title = true
pref-strict-album = true
pref-accept-no-length = false
```
sldl will therefore prefer mp3 files with bitrate between 200 and 2500 kbps, and whose length
differs from the supplied length by no more than 3 seconds. It will also prefer files whose
paths contain the supplied title and album (ignoring case, and bounded by boundary characters)
and which have non-null length. Changing the last three preferred conditions is not recommended.  
Note that files satisfying a subset of the preferred conditions will still be preferred over files
that don't satisfy any condition, but some conditions have precedence over others. For instance,
a file that only satisfies strict-title (if enabled) will always be preferred over a file that
only satisfies the format condition. Run with --print "results-full" to reveal the sorting logic.

Conditions can also be supplied as a semicolon-delimited string with --cond and --pref, e.g
`--cond "br >= 320; format = mp3,ogg; sr < 96000"`.

### Filtering irrelevant results
  The options --strict-title, --strict-artist and --strict-album will filter any file that
  does not contain the title/artist/album in the filename (ignoring case, bounded by boundary
  chars).  
  Another way to prevent false downloads is to set --length-tol to 3 or less to make it ignore
  any songs that differ from the input by more than 3 seconds. However, all 4 options are already
  enabled as 'preferred' conditions by default, meaning that such files will only be downloaded
  as a last resort anyways. Hence it is only recommended to enable them if you need to minimize
  false downloads as much as possible, or for special cases like tracks or albums whose name
  is just one or a two characters.

### Important note
  Some info may be unavailable depending on the client used by the peer. For example, the standard
  Soulseek client does not share the file bitrate. If (e.g) --min-bitrate is set, then sldl will
  still accept any file with unknown bitrate. You can configure it to reject all files where one
  or more of the checked properties is null (unknown) by enabling --strict-conditions.  
  As a consequence, if --min-bitrate is also set then any files shared by users with the default
  client will be ignored. Also note that the default preferred conditions will already affect
  ranking with this option due to the bitrate and samplerate checks.

## Name format

Variables enclosed in {} will be replaced by the corresponding file tag value.
Name format supports subdirectories as well as conditional expressions like {tag1|tag2} - If
tag1 is null, use tag2. String literals enclosed in parentheses are ignored in the null check.

### Examples:
  - `{artist} - {title}`  
      Always name it 'Artist - Title'. Because some files on Soulseek are untagged, the
      following is generally preferred:
  - `{artist( - )title|filename}`  
      If artist and title are not null, name it 'Artist - Title', otherwise use the original
      filename.
  - `{albumartist(/)album(/)track(. )title|(missing-tags/)foldername(/)filename}`  
      Sort files into artist/album folders if all tags are present, otherwise put them in
      the 'missing-tags' folder.   

### Available variables:
```
artist                          First artist (from the file tags)
sartist                         Source artist (as on CSV/Spotify/YouTube/etc)
artists                         Artists, joined with '&'
albumartist                     First album artist
albumartists                    Album artists, joined with '&'
title                           Track title
stitle                          Source track title
album                           Album name
salbum                          Source album name
year                            Track year or date
track                           Track number
disc                            Disc number
filename                        Soulseek filename without extension
foldername                      Soulseek folder name
extractor                       Name of the extractor used (CSV/Spotify/YouTube/etc)
default-folder                  Default sldl folder name (usually the playlist name)
```

## Configuration
### Config Location:
  sldl will look for a file named sldl.conf in the following locations:
```
~/AppData/Roaming/sldl/sldl.conf
~/.config/sldl/sldl.conf
```
  as well as in the directory of the executable.

### Syntax:
  Example config file:
```
username = your-username
password = your-password
pref-format = flac
fast-search = true
```
  Lines starting with hashtags (#) will be ignored. Tildes in paths are expanded as the user
  directory. The path variable `{bindir}` stores the directory of the sldl binary.

### Configuration profiles:
  Profiles are supported:
```
[lossless]
pref-format = flac,wav
```
  To activate the above profile, run --profile "lossless". To list all available profiles,
  run --profile "help".  
  Profiles can be activated automatically based on a few simple conditions:
```
[no-stale]
profile-cond = interactive && download-mode == "album"
max-stale-time = 999999
# album downloads will never be automatically cancelled in interactive mode

[youtube]
profile-cond = input-type == "youtube"
path = ~/downloads/sldl-youtube
# download to another location for youtube
```
  The following operators are supported for use in profile-cond: &&, ||, ==, !=, !{bool}.  
  The following variables are available:
```
input-type        ("youtube"|"csv"|"string"|"bandcamp"|"spotify")
download-mode     ("normal"|"aggregate"|"album"|"album-aggregate")
interactive       (bool)
  ```
## Examples

Download tracks from a csv file:
```
sldl test.csv
```
<br>

Download spotify likes:
```
sldl spotify-likes
```
<br>

Interactive album download:
```
sldl "Some Album" -a -t
```
<br>

Download a specific song by name, preferring lossless:
```
sldl "MC MENTAL @ HIS BEST, length=242" --pref-format "flac,wav"
```  
<br>

Download the album of every song in a spotify playlist:
```
sldl https://spotify/playlist/id -a
```

<br>

Retrieve deleted video names, then download from a youtube playlist with fallback to yt-dlp:
```
sldl https://www.youtube.com/playlist/id --get-deleted --yt-dlp
```
<br>

Print all songs by an artist which are not in your library:
```
sldl "artist=MC MENTAL" -g --skip-music-dir "path/to/music" --print results-full
```
<br>

Download all albums by an artist interactively:
```
sldl "artist=MC MENTAL" -a -g -t
```

#### Advanced example: Automatic wishlist downloader
Create a file named `wishlist.txt`, and add some items as detailed in [Input types: List](#list):
```
"Artist - My Favorite Song"    "format=flac"
a:"Artist - Some Album, album-track-count=5"
```
Add a profile to your `sldl.conf`:
```bash
[wishlist]
input = ~/sldl/wishlist.txt 
input-type = list
index-path = ~/sldl/wishlist-index.sldl
album-parallel-search = true
```
This will create a global index file `wishlist-index.sldl` which will be scanned every time sldl is run to skip wishlist items that have already been downloaded. If you want to continue searching until a version satisfying the preferred conditions is downloaded, also add `skip-check-pref-cond = true` (note that this requires the files to remain in the same spot after being downloaded).  
Finally, set up a cron job (or a scheduled task on windows) to periodically run sldl with the following option:
```
sldl --profile wishlist
```


## Notes
- For macOS builds you can use publish.sh to build the app. Download dotnet from https://dotnet.microsoft.com/en-us/download/dotnet/6.0, then run `chmod +x publish.sh && sh publish.sh`. For intel macs, uncomment the x64 and comment the arm64 section in publish.sh. 
- The printed output may appear duplicated, overlap, or not update on some configurations (new windows terminal, git bash). Use another terminal or `--no-progress` in case of issues.

## Docker

A docker container for running `sldl` can be built from this repository. The image supports linux x86/ARM. 

To build and start container:

```shell
clone https://github.com/fiso64/slsk-batchdl
cd slsk-batchdl
docker compose up -d
```

`exec` into the container to start using `sldl`:

```shell
docker compose exec sldl sh
sldl --help
```

The compose stack mounts two directories relative to where `docker-compose.yml` is located which can be used for file management:

* `/config` (at `./config` on host) - put your `sldl.conf` [configuration](#configuration-) in this directory and then use `sldl -c /config ...` to use your configuration in the container
* `/data` (at `./data` on host) - use as the download directory IE `sldl -p /data ...`

### File Permissions

If you are running Docker on a **Linux Host** you should specify `user:group` permissions of the user who owns the **configuration and data directory** on the host to avoid [docker file permission problems.](https://ikriv.com/blog/?p=4698) These can be specified using the [environmental variables **PUID** and **PGID**.](https://docs.linuxserver.io/general/understanding-puid-and-pgid)

To get the UID and GID for the current user run these commands from a terminal:

* `id -u` -- prints UID
* `id -g` -- prints GID

Replace these with the corresponding variable (`PUID` `PGID`) in `docker-compose.yml`.


### Cron

One or more `sldl` commands can be run on a schedule using [cron](https://en.wikipedia.org/wiki/Cron) built into the container.

To create a schedule make a new file on the host `./config/crontabs/abc` and use it with the standard [crontab](https://en.wikipedia.org/wiki/Cron#Overview) syntax.

Make sure to restart the container after any changes to the cron file are made.

Example => Run `sldl` every Sunday at 1am, search for missing tracks from the specified Spotify playlist

```
# min   hour    day     month   weekday command
0 1 * * 0 sldl https://open.spotify.com/playlist/6sf1WR5grXGJ6dET -c /config -p /data --index-path /data/index.sldl
```

[crontab.guru](https://crontab.guru/) could be used to help with the scheduling expression.