About

Sometimes, you just need a way to randomly display media from your filesystem.

Simply point this tool at one or more directories, and then open the specified port (default 8080) in your browser.

A new file will be selected if you open / directly, or if you click on any displayed files.

Browser history is preserved, so you can always go back to any previously displayed media.

Feature requests, code criticism, bug reports, general chit-chat, and unrelated angst accepted at roulette@seedno.de.

Static binary builds available here.

I only test the linux/amd64, linux/arm64, and windows/amd64 builds, the rest are all best-effort™.

x86_64 and ARM Docker images of latest version: oci.seedno.de/seednode/roulette:latest.

Dockerfile available here.

Caching

If the -c|--cache flag is passed, the indices of all specified paths will be cached on start.

This will slightly increase the delay before the application begins responding to requests, but should significantly speed up subsequent requests.

The cache can be regenerated at any time by accessing the /clear_cache endpoint.

If --cache-file is set, the cache will be loaded from the specified file on start, and written to the file whenever it is re-generated.

Filtering

You can provide a comma-delimited string of alphanumeric patterns to match via the include= query parameter, assuming the -f|--filter flag is enabled.

Only filenames matching one or more of the patterns will be served.

You can also provide a comma-delimited string of alphanumeric patterns to exclude, via the exclude= query parameter.

Filenames matching any of these patterns will not be served.

You can combine these two parameters, with exclusions taking priority over inclusions.

Both filtering parameters ignore the file extension and full path; they only compare against the bare filename.

Info

If the -i|--info flag is passed, six additional endpoints are registered.

The first of these—/html and /json—return the contents of the index, in HTML and JSON formats respectively.

If --page-length is also set, these can be viewed in paginated form by appending /n, e.g. /html/5 for the fifth page.

This can prove useful when confirming whether the index is generated successfully, or whether a given file is in the index.

The remaining four endpoints—/available_extensions, /enabled_extensions, /available_mime_types and /enabled_mime_types—return information about the registered file types.

Refresh

If the --refresh flag is passed and a positive-value refresh=<integer><unit> query parameter is provided, the page will reload after that interval.

This can be used to generate a sort of slideshow of files.

Minimum accepted value is 500ms, as anything lower seems to cause inconsistent behavior. This might be changed in a future release.

Supported units are ns, us/µs, ms, s, m, and h.

Russian

If the --russian flag is passed, everything functions exactly as you would expect.

That is, files will be deleted after being served. This is not a joke, you will lose data.

This uses os.Remove() and checks to ensure the specified file is inside one of the paths passed to roulette.

That said, this has not been tested to any real extent, so only pass this flag on systems you don't care about.

Enjoy!

Sorting

You can specify a sorting direction via the sort= query parameter, assuming the -s|--sort flag is enabled.

A value of sort=asc means files will be served in ascending order (lowest-numbered to highest).

If a file exists with a numbered suffix one higher than the currently displayed file, it will be served next.

A value of sort=desc means files will be served in descending order (highest-numbered to lowest).

If a file exists with a numbered suffix one lower than the currently displayed file, it will be served next.

In either case, if no sequential file is found, a new random one will be chosen.

For sort=asc, the lowest-numbered file matching a given name will be served first.

For sort=desc, the highest-numbered file will be served instead.

If any other (or no) value is provided, the selected file will be random.

Note: These options require sequentially-numbered files matching the following pattern: filename[0-9]*.extension.

Themes

The --code handler provides syntax highlighting via alecthomas/chroma.

Any supported theme can be passed via the --theme flag.

By default, solarized-dark256 is used.

Usage output

Serves random media from the specified directories.

Usage:
  roulette <path> [path]... [flags]

Flags:
  -a, --all                       enable all supported file types
      --audio                     enable support for audio files
  -b, --bind string               address to bind to (default "0.0.0.0")
  -c, --cache                     generate directory cache at startup
      --cache-file string         path to optional persistent cache file
      --case-sensitive            use case-sensitive matching for filters
      --code                      enable support for source code files
      --code-theme string         theme for source code syntax highlighting (default "solarized-dark256")
      --exit-on-error             shut down webserver on error, instead of just printing the error
  -f, --filter                    enable filtering
      --flash                     enable support for shockwave flash files (via ruffle.rs)
      --handlers                  display registered handlers (for debugging)
  -h, --help                      help for roulette
      --images                    enable support for image files
  -i, --info                      expose informational endpoints
      --max-directory-scans int   number of directories to scan at once (default 32)
      --max-file-count int        skip directories with file counts above this value (default 2147483647)
      --max-file-scans int        number of files to scan at once (default 256)
      --min-file-count int        skip directories with file counts below this value (default 1)
      --page-length int           pagination length for info pages
  -p, --port int                  port to listen on (default 8080)
      --prefix string             root path for http handlers (for reverse proxying) (default "/")
      --profile                   register net/http/pprof handlers
  -r, --recursive                 recurse into subdirectories
      --refresh                   enable automatic page refresh via query parameter
      --russian                   remove selected images after serving
  -s, --sort                      enable sorting
      --text                      enable support for text files
  -v, --verbose                   log accessed files and other information to stdout
  -V, --version                   display version and exit
      --video                     enable support for video files

Building the Docker container

From inside the docker/ subdirectory, build the image using the following command:

REGISTRY=<registry url> LATEST=yes TAG=alpine ./build.sh