Show HN: Chez Scheme txtar port from Go | Hacker News Reader

Show HN: Chez Scheme txtar port from Go

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This is a loose port of https://golang.org/x/tools/txtar, which concatenates files together and allows for a top-level comment.

The txtar format is specifically designed to be easy for humans to read and write by hand. It's perfect for test data.

The library itself tries to follow scheme standards by depending on only SRFIs (and if you're new to scheme like me, SRFI stands for "Scheme Requests For Implementation," and it's like a standard library). I hope this is a helpful showcase of a scheme library!

I'm also new to writing scheme, and if any experienced scheme/lisp devs are out there with feedback, that would be much appreciated.

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Simple format. Makes me want to write a parser for it using a shared buffered reader library I’m working on in Rust.

txtar is used in the testsuite package to make writing CLI (blackbox) tests really easy. It adds a header section for the steps to run and comparisons to make. Often you compare actual output with golden data.

(https://github.com/golang/go/tree/master/src/cmd/go/testdata...)

The tools have been extracted and made installable from here: https://github.com/rogpeppe/go-internal/tree/master/cmd This is really handy for any project to have people submit reproducers as a single file anyone can run. These tools make it so you can transform between txtar and files on disk, and then run the txtar (testscript) as a test or directory of tests.

I have built them into my hof tool, "hof run [--mode test] file.txtar" so you run them as either test files or multifile scripts. The second option is handy if you want to eject a file onto the filesystem without having to do echo or EOF business in bash scripts

https://github.com/hofstadter-io/hof/tree/_dev/script/runtim...

https://docs.rs/txtar/latest/txtar/

The Go version treats file data as byte arrays; might want to do the same and use Scheme bytevectors instead of strings. OTOH the docs say it's not supposed to be a general binary format...

Similar format: https://github.com/google/hrx

hrx looks much better, as txtar can't include, e.g., other txtar files

The Markdown of archives.

I have been using txtar to provide context to LLM's recently.

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