Bundown is a fast all-in-one Markdown runtime and bundler.

You can install bundown (bd) globally using Bun:

bun i -g bundown

Bundown runs TS, JS, and Shell code. It pretty-prints and syncs code in almost any language.

• Usage
• Changelog
• Contributing
• Roadmap
• Scripts
  • Format
• Source
• MIT License

• bundown run to run a Markdown file from a path or URL
• bundown sync to pack/unpack code between files and Markdown
• bundown -h to view help
• bundown upgrade to update Bundown

See what's planned in the roadmap.

• Improvements
  • bundown --print uses improved box drawing for run & sync code printing.

• Features
  • bundown run <file> now aliases bundown <file>.
  • bundown sync synchronizes Markdown codeblocks with actual code files using file tags in the codeblock metadata:
    • --file <file> (-f) in a codeblock meta header sets the corresponding file.
    • bundown <file> does not run code blocks with a --file flag.
    • bundown sync <file> <dir> (over)writes files in <dir> with corresponding codeblocks from <file>.
    • bundown sync <url> <dir> downloads and over(writes) the files in <dir> with codeblocks from <url>.
    • bundown sync --print (-p) pretty-prints the synced files.
  • bundown https://example.com/file.md runs a Markdown file from a URL.
  • bundown --tag <tag> <file> (-t) runs only code blocks with the specified tag.
    • --tag <tag> (-t) in a codeblock meta header tags the codeblock with <tag>.
    • bundown <file> does not run code blocks with a --tag flag.
  • bundown auto-detects operating system and only runs corresponding codeblocks.
    • --os <os> in a codeblock meta header tags the codeblock with <os>.
    • linux and macos/darwin are supported <os> tags.
  • bundown <dir> auto-detects the best potential default file like readme.md and runs it.
• Improvements
  • bundown now has a block-level args parser for advanced features.
  • bundown now uses abstract syntax trees to parse and manipulate Markdown.
  • bundown --print uses syntax highlighting for code blocks and rich text.
• Languages
  • bundown can print and sync: c, cuda, c++, c#, css, diff, go, graphql, .gitignore, html, arduino, java, javascript, json, jsx, kotlin, less, lua, makefile, markdown, objective-c, perl, php, python, r, ruby, rust, scss, shell, sql, svg, swift, toml, tsx, typescript, xml, vb.net, wasm, yaml, and many aliases for the aforementioned.

• Improvements
  • bundown upgrade fixed.

• Improvements
  • bundown checks that the user has bun@^1.0.24 installed and reports a helpful error message if not.

• Improvements
  • bundown upgrade upgrades bundown to the latest version.

• Improvements
  • package.json now lists runtime dependencies.

• Features
  • bundown --version (-v) prints the version of bundown installed.
  • bundown --print <file> (-p) pretty-prints the Markdown and syntax highlighted code blocks.
  • bundown --help (-h) prints a help message.
• Improvements
  • bundown now uses ANSI colors for more helpful usage messages & pretty-printing.

• Features
  • bundown recognizes languages regardless of case, allowing uppercase language names in code blocks.
• Improvements
  • bundown now uses a single parser loop to run faster in less lines of code.

• Features
  • bundown can run multiple instances at once.
  • bundown returns the same exit code as the code it ran.

• Improvements
  • bundown has developer tooling including biome code formatting via bundown and a .gitignore file.

• Improvements
  • bundown doesn't skip a code block if a supported language is specified in full but has extra whitespace/content on the language line.

• Features
  • bundown <file> runs TypeScript, JavaScript, and Shell code blocks in Markdown files.
  • bundown can be installed globally using npm, bun, pnpm, or yarn and run from anywhere.

If you have any bugs, feature requests, etc. please open a discussion, issue or pull request as appropriate.

Before you open a PR, use this script to format the code with biome. We use an opinionated style guide, aimed at maximizing the intuitive readability of code and minimizing noisy syntax - follow it.

We also have a roadmap of planned features and bugs we'd like to fix if you'd like to pick one up:

See what's already been done in the changelog. Please suggest changes.

• Features
  • bundown sync <url> <file> downloads and over(writes) the Markdown file from <url> into <file>.
  • bundown sync <dir> <file> (over)writes codeblocks in <file> with corresponding files from <dir>.
    • --no-new-blocks does not create new codeblocks in <file> for files in <dir> without corresponding codeblocks.
  • bundown sync bundown.md . is used to sync the bundown codebase from a single file.
  • bundown sync --delete deletes files/blocks in the destination that don't exist in the source.
  • bundown --interactive <file> (-i) pretty-prints each code block before running with a Y/N prompt to run it.
  • bundown detects potentially unsafe code and prompts the user to run interactively if so.
  • bundown uses source mapping to deliver helpful and traceable error messages when code blocks or individual lines of code fail.
  • bundown ai uses the core runtime, pretty-printing, and safe execution to deliver a great private, local, open-source alternative interface to LLM chat/search/code apps.
  • ... | bundown can be used to pipe Markdown into bundown instead of using a file path.
  • bundown tasks allows you to view and manage task lists.
  • bundown.config.md allows a user to set a custom color theme for Bundown.
• Improvements
  • bundown should safely escape the content of Shell code when compiling to TS.
  • bundown --print visually formats Markdown segments (code, links, etc.) beyond just syntax highlighting.
  • bundown --print supports GFM style autolinks.
  • bundown --print supports GFM style task lists.
  • bundown --print supports GFM style tables.
  • bundown --print supports GFM style footnotes.
  • bundown --print converts emoji codes like :fire: to actual emojis.
  • bundown --print pretty-prints math e.g. replacing common TeX characters e.g. \pi to π.
• Languages
  • bundown shares variables and functions between code blocks, regardless of language.
  • bundown can print and sync: sass, zig, assembly, haskell, lisp, clojure, julia, brainfuck, latex, and more?
  • bundown can run: python, c#, c++, c, zig, rust, php, go, ruby, lua, assembly, wasm, lisp, clojure, julia, brainfuck, and more?

If you have Bundown installed, you can run any of the following scripts with bundown -t <script>

We use biome to format our code.

To format all files in the project, make sure you have biome installed and run:

bun x biome format --write .