About

Kansei (感性) is a language based on Rust inspired by Ruby 1.8 with a functional flavour.

The language is desribed in LANGUAGE.md, which gets synced from time to time to kansei-language/LANGUAGE.md

A number of snippets can be found in files in the tests/ directory.

It supports currying:

fn add(x, y)
  x + y
end

add10 = add(10)
puts "Add 10 to 5: " + add10(5)

Logging defaults to stderr via log(...) and can be redirected with -l/--log <path>. Use std::log to change log target/format at runtime.

CLI helpers:

• kansei fmt <path> formats .ks files in place
• kansei check <path> parses .ks files and exits non-zero on errors
• kansei test <path> runs .ks files and compares against .out/.err if present
• kansei install [path] installs dependencies from kansei.toml or local module paths
• kansei wasm install <name> builds and installs a wasm module from the wasm-modules repo
• kansei lsp starts a minimal Language Server over stdio (diagnostics only)

WASM install defaults:

• Repo: ../kansei-wasm-modules if present, otherwise https://github.com/ahcm/kansei-wasm-modules
• Target: wasm32-wasip1 (override with --wasm-target)

Custom repo/target:

kansei wasm install <name> --wasm-modules-repo <path-or-url> --wasm-target <target>

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Have fun and may the force be with you!

-- Andreas Hauser, München, 8.1.2026