wildling

Fortran library and CLI for pattern-based string generation. Zero third-party libraries — ISO Fortran / gfortran only, with a hand-rolled JSON parser for --template. Pattern splitting is hand-rolled (no regex).

Docs: Website · Sandbox · Syntax · Source

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 fortran
./build.sh
./bin/wildling "Year 19##"

From a release tag:

git clone --branch v2.0.0 --depth 1 https://github.com/dotmonk/wildling.git
cd wildling
./build.sh fortran

Produces dist/wildling. Use the modules under src/ (except cli.f90) as a library.

use wl_util
use wl_wildling

type(str_list) :: patterns
type(dictionaries) :: dicts
type(wildling_t) :: w
character(len=:), allocatable :: value

call str_list_init(patterns)
call str_list_push(patterns, 'Year 19##')
call dictionaries_init(dicts)
call wildling_init(w, patterns, dicts)
do
  if (.not. wildling_next(w, value)) exit
  print '(A)', value
end do
call wildling_free(w)

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. Out-of-range --select / --range write out of range: <index> on stderr and exit 1.

Build

./build.sh   # Docker (gcc:14-bookworm + gfortran): → dist/wildling + help.txt

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

Layout

fortran/
  src/
    util.f90           string lists + dictionaries
    token.f90          token expansion
    parse_pattern.f90  hand-rolled pattern split + tokenizers
    generator.f90      single-pattern generator
    wildling.f90       multi-pattern API
    json.f90           template JSON parser
    cli.f90            CLI entry point
  bin/wildling         launcher script
  build.sh             Docker build (gfortran)
  dist/                build output (gitignored)