# marcpaq/b1fipl

A Bestiary of Single-File Implementations of Programming Languages

Repository: https://github.com/marcpaq/b1fipl
Canonical: https://ross.abutalabs.com/products/b1fipl
License Family: other
Topics: programming-language, pascal, brainfuck, forth, lisp, basic
Last push: 2026-02-05T08:13:57+00:00

## Health v2 (maintenance only)
Score: 62/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 66, release rhythm 35, longevity 100
- inputs: {"age_days": 3232, "days_push": 209, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1039, forks 43 (observed 2026-08-28T04:03:20.033202+00:00)

## What it is
A curated collection of links to single-file implementations of programming languages such as Lisp, Forth, Pascal, BASIC, and Brainfuck. It serves as an approachable educational resource for learning how programming languages and interpreters are built.

## Use cases
- learn how to implement a programming language
- find a minimal lisp interpreter source code
- study a small forth implementation in C
- understand interpreters without reading millions of lines
- find teaching examples for a compilers course
- explore how brainfuck or basic interpreters work

## When to choose
- you want concise, readable examples of language implementations
- you are learning interpreter or compiler fundamentals
- you need small self-contained codebases to study or teach with

## When to avoid
- you need a production-ready language implementation
- you require complete, efficient, or well-supported toolchains
- you need a project with an explicit license or active maintenance guarantees

## Facets
- artifact type: learning-resource
- maturity: active
- function: interpreter, compiler, programming-language, developer-tools
- domain: programming-languages, tutorials, awesome-lists, education, compilers, parsers
- platform: cross-platform, cli
- tags: curated-list, single-file-implementations, lisp, forth, pascal, brainfuck, basic, educational

## Member repositories
- marcpaq/b1fipl (main) score 62

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:20.033202+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:03:37.718178+00:00, confidence not recorded.
  - readme: https://github.com/marcpaq/b1fipl (fetched 2026-08-28T04:03:20.033202+00:00, sha 083d7875192e)
- Data as of 2026-08-30T08:39:29.467469+00:00.