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## About
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Sometimes, you just need a way to randomly display images from your filesystem.
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Simply point this tool at one or more directories, and then open the specified port (default `8080` ) in your browser.
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A new image will be selected if you open `/` directly, or if you click on any displayed image.
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Browser history is preserved, so you can always go back to any previously displayed image.
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Supported file types and extensions are `bmp` , `gif` , `jp[e]g` , `png` , and `webp` .
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Feature requests, code criticism, bug reports, general chit-chat, and unrelated angst accepted at `roulette@seedno.de` .
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Static binary builds available [here ](https://cdn.seedno.de/builds/roulette ).
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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 ](https://git.seedno.de/seednode/docker-roulette ).
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## Filtering
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You can provide a comma-delimited string of alphanumeric patterns to match via the `include=` query parameter, assuming the `-f|--filter` flag is enabled.
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Only filenames matching one or more of the patterns will be served.
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You can also provide a comma-delimited string of alphanumeric patterns to exclude, via the `exclude=` query parameter.
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Filenames matching any of these patterns will not be served.
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You can also combine these two parameters, with exclusions taking priority over inclusions.
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Both filtering parameters ignore the file extension and full path; they only compare against the bare filename.
## Sorting
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You can specify a sorting pattern via the `sort=` query parameter, assuming the `-s|--sort` flag is enabled.
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A value of `sort=asc` means files will be served in ascending order (lowest-numbered to highest).
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If a file exists with a numbered suffix one higher than the currently displayed file, it will be served next.
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A value of `sort=desc` means files will be served in descending order (highest-numbered to lowest).
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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.
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For `sort=asc` , the lowest-numbered file matching a given name will be served first.
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For `sort=desc` , the highest-numbered file will be served instead.
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If any other (or no) value is provided, the selected file will be random.
Note: These patterns require sequentially-numbered files matching the following pattern: `filename###.extension` .
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## Refresh
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If a positive-value `refresh=<integer><unit>` query parameter is provided, the page will reload after that interval.
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This can be used to generate a sort of slideshow of images.
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Supported units are `ns` , `us` /`µs`, `ms` , `s` , `m` , and `h` .
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## Caching
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If the `-c|--cache` flag is passed, the indices of all specified paths will be cached on start.
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This will slightly increase the delay before the application begins responding to requests, but should significantly speed up subsequent requests.
If any `include=` /`exclude=` filters are specified in a given request, the cache will be bypassed for that specific request.
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The cache can be regenerated at any time by accessing the `/clear_cache` endpoint.
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## Debug
If the `-d|--debug` flag is passed, an additional endpoint, `/stats` , is registered.
When accessed, this endpoint returns a JSON document listing every file served, along with the number of times it has been served.
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## Usage output
```
Usage:
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roulette < path > [path]... [flags]
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roulette [command]
Available Commands:
completion Generate the autocompletion script for the specified shell
help Help about any command
version Print version
Flags:
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-c, --cache only scan directories once, at startup (or when filters are applied)
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-d, --debug store list of files served and number of times they were served
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-f, --filter enable filtering via query parameters
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-h, --help help for roulette
-p, --port uint16 port to listen on (default 8080)
-r, --recursive recurse into subdirectories
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-s, --sort enable sorting via query parameters
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-v, --verbose log accessed files to stdout
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Use "roulette [command] --help" for more information about a command.
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```
