build: generate README.md from data/projects.toml

Author: dbohdan

.gitattributes

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+Makefile linguist-vendored
+*.md.template linguist-vendored
+render-template.ts linguist-vendored

.gitignore

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+/attic

CONTRIBUTING.md

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+# Contributing
+
+## Do not edit `README.md` directly
+
+`README.md` is automatically generated from `README.md.jinja2` and the data in [`data/projects.toml`](data/projects.toml). Do not edit `README.md` directly. To add a project or update a project's information, edit `data/projects.toml`. Edit `README.md.njk` to change information not derived from `data/projects.toml`.

Makefile

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+all: README.md
+
+README.md: README.md.njk render-template.ts Makefile data/projects.toml
+	./render-template.ts README.md.njk data/projects.toml > $@
+
+.PHONY: all

README.md

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+# Embedded scripting languages
+
+The following is a list of reasonably mature open source [embedded scripting languages](https://en.wikipedia.org/wiki/Scripting_language) to use in your application.  Stretching the definition of a scripting language, it also includes [Datalog](https://en.wikipedia.org/wiki/Datalog) implementations.  Items with a strong copyleft license (like the GNU GPL) that will apply to the rest of your code are **highlighted** as a warning.
+
+{% macro row(proj) %}
+| [{{ proj.name }}]({{ proj.url }}) | {{ proj.impl_lang }} | {{ proj.gc }} | {{ proj.license }} | {{ proj.notes | safe }} |{% endmacro %}
+
+| Project name/link | Implementation language | GC | License | Notes |
+|-------------------|-------------------------|----|---------|-------|
+{% for proj in projects | sort(caseSen=false, attr="sort_key") %}
+{{ row(proj) }}
+{% endfor %}
+
+## See also
+
+* [cwal: Scripting Engine Without A Language](https://fossil.wanderinghorse.net/r/cwal/home).
+* [Game scripting languages benchmarked](https://github.com/r-lyeh/scriptorium).
+* [Languages that compile to JavaScript](https://github.com/jashkenas/coffeescript/wiki/List-of-languages-that-compile-to-JS).
+* [Languages that compile to Lua](https://github.com/hengestone/lua-languages).
+* [miniKanren](http://minikanren.org/#implementations) logic programming language implementations.
+* [sol](https://github.com/ThePhD/sol2) — C++ bindings for Lua.
+
+## Contributing
+
+Your contributions are welcome!  Please submit a pull request or create an issue to add a new language to the list.  I am looking for language implementations that are either actively maintained or largely "done".  The VM, bytecode compiler, and standard library (if any) must have a free (*libre*) license.  They may have optional add-ons with any license.  A Datalog implementation must be able to parse Datalog source code; it must not be just an [EDSL](https://en.wikipedia.org/wiki/Domain-specific_language#External_and_Embedded_Domain_Specific_Languages).
+
+## License
+
+[![CC0](https://i.creativecommons.org/p/zero/1.0/88x31.png)](https://creativecommons.org/publicdomain/zero/1.0/)
+
+## Disclosure
+
+The curator of this document maintains Picol and has contributed to Jim Tcl.