wildling

Rust library and CLI for pattern-based string generation. Zero crates.io dependencies (Rust standard library only). Pattern splitting and JSON parsing are hand-rolled.

Docs: Website · Sandbox · Syntax · Source

Registry: crates.io

Example

http://${'dev,stage,prod'}\-${'api,web'}#{0-2}.example.${'com,net,org'}/@.html

(The \- is a literal hyphen; bare - would mean “one letter or digit”. @ is one lowercase letter.)

That builds URL-shaped candidates: scheme http://, then environment × service × optional digits × TLD, then a one-letter path page. Three environments, two services, zero–two digits ('', 0–9, 00–99), three TLDs, and a–z → 51948 strings — the kind of list you generate for fuzzing links or probing staging hosts, not type out.

A few of them:

http://dev-api.example.com/a.html / http://stage-web.example.com/z.html
http://dev-api0.example.net/a.html / http://prod-web9.example.org/m.html
http://dev-api00.example.com/a.html / http://prod-web99.example.org/z.html

Named dictionaries (%{'hosts'}) work the same way when the word lists live in files.

Try it in the sandbox, or see pattern syntax for length ranges, dictionaries, and escapes.

Install

From this repository:

cd rust
./build.sh
./bin/wildling "Year 19##"

Git / path: Cargo does not allow git and path on the same dependency. Clone the tag (or add the monorepo as a git submodule) and depend on the rust/ crate path:

git clone --branch v2.0.7 --depth 1 https://github.com/dotmonk/wildling.git

# Cargo.toml in your app
wildling = { path = "../wildling/rust" }  # adjust relative path

cargo install --path path/to/wildling/rust   # CLI from that clone

Registry:

cargo add wildling          # library
cargo install wildling      # CLI

use wildling::{Dictionaries, Wildling};

let dicts = Dictionaries::new();
let mut w = Wildling::new(&["Year 19##".to_string()], &dicts);
while let Some(value) = w.next() {
    println!("{value}");
}

CLI

./bin/wildling "Year 19##"
./bin/wildling --dictionary planets:../dictionaries/planets.txt "%{'planets'}"
./bin/wildling --template ./config.json

Help text and --check output follow docs/cli.md / docs/help.txt.

Build

./build.sh   # Docker (rust:1.83): cargo build --release → dist/wildling

Project tests live in ../tests/ and are run with ../test.sh.