tricu

Introduction

tricu (pronounced "tree-shoe") is a programming language experiment in Haskell. It is fundamentally based on the application of Triage Calculus, an extended form of Tree Calculus, terms, but minimal syntax sugar is included.

tricu is the word for "tree" in Lojban: (x1) is a tree of species/cultivar (x2).

I have fully embraced the slopmachine (LLM-assisted development) for this project. Nothing is stable or sacred. We will discover sanity at the end of the journey but we won't strive for it until then.

Acknowledgements

Tree Calculus was discovered by Barry Jay. The addition of Triage rules were suggested by Johannes Bader. Johannes is also the creator of treecalcul.us which has a great intuitive code playground using his language LambAda.

REPL examples

tricu < -- Anything after `--` on a single line is a comment
tricu < id = (a : a) -- Lambda abstraction is eliminated to tree calculus terms
tricu < head (map (i : append i " world!") [("Hello, ")])
tricu > "Hello,  world!"
tricu < id (head (map (i : append i " world!") [("Hello, ")]))
tricu > "Hello,  world!"

tricu < -- Intensionality! We can inspect the structure of a function or data.
tricu < triage = (a b c : t (t a b) c)
tricu < test = triage "Leaf" (z : "Stem") (a b : "Fork")
tricu < test (t t)
tricu > "Stem"
tricu < -- We can even convert a term back to source code (/demos/toSource.tri)
tricu < toSource not?
tricu > "(t (t (t t) (t t t)) (t t (t t t)))"
tricu < -- or calculate its size (/demos/size.tri)
tricu < size not?
tricu > 12

tricu < !help 
tricu version 1.1.0
Available commands:
    !exit        - Exit the REPL
    !clear       - Clear the screen
    !reset       - Reset preferences for selected versions
    !help        - Show tricu version and available commands
    !output      - Change output format (tree|fsl|ast|ternary|ascii|decode)
    !definitions - List all defined terms in the content store
    !import      - Import definitions from file to the content store
    !watch       - Watch a file for changes, evaluate terms, and store them
    !refresh     - Refresh environment from content store (definitions are live)
    !versions    - Show all versions of a term by name
    !select      - Select a specific version of a term for subsequent lookups
    !tag         - Add or update a tag for a term by hash or name

Installation and Use

You can easily build and run this project using Nix.

• Quick Start (REPL):
  • nix run git+https://git.eversole.co/James/tricu
• Build executable in ./result/bin:
  • nix build git+https://git.eversole.co/James/tricu

./result/bin/tricu --help

tricu Evaluator and REPL

tricu [COMMAND] ... [OPTIONS]
  tricu: Exploring Tree Calculus

Common flags:
  -? --help       Display help message
  -V --version    Print version information

tricu [repl] [OPTIONS]
  Start interactive REPL

tricu eval [OPTIONS]
  Evaluate tricu and return the result of the final expression.

  -f --file=FILE  Input file path(s) for evaluation.
                    Defaults to stdin.
  -t --form=FORM  Optional output form: (tree|fsl|ast|ternary|ascii|decode).
                    Defaults to tricu-compatible `t` tree form.

tricu decode [OPTIONS]
  Decode a Tree Calculus value into a string representation.

  -f --file=FILE  Optional input file path to attempt decoding.
                    Defaults to stdin.