Pyramid is a dialect of the Scheme programming language targeting the Ethereum Virtual Machine(EVM).

Here is an example of a Pyramid program:

(begin
  (define (factorial n)
    (if (= n 1)
        1
        (* (factorial (- n 1)) n)))
  (factorial 5))

Pyramid Scheme is under heavy construction. Join our public Discord channel if you'd like to contribute or use Pyramid to develop Ethereum contracts.

After installing the prerequisites(listed below),

$ ./pyramid -t tests/0001-factorial.pmd 
(Test Passed:  return 120 120 ((s . 14066) (g . 47052) (z . 3591)))

To deploy that program on a test network:

• Install Ganache CLI
• Start an EthereumJS test chain: ganache-cli -l 10000000. It will output a list of "Available Accounts".
• Change the from variable in deploy.js to one of the test accounts.
• Change the code variable to be the hex string that the Pyramid compiler output
• Install the Go Ethereum client.
• Attach to the EthereumJS chain: geth attach http://localhost:8545.
• Copy the contents of deploy.js into the geth Javascript prompt.

You can see advanced command line options using pyramid --help.

• Install the Racket language runtime at https://download.racket-lang.org
• Install necessary packages using "raco pkg install ". The packages are:
  • binaryio-lib
  • errortrace-lib
• Ensure the keccak-256sum tool is available on your PATH
  • https://github.com/maandree/sha3sum

I recommend Emacs with racket-mode. You should add Pyramid's .pmd extension to the list of racket-mode file extensions:

(add-to-list 'auto-mode-alist '("\\.pmd\\'" . racket-mode))

This project is licensed under the GNU AGPL 3.0 - see the LICENSE.md file for details

• Racket

• Michael Burge - Main Developer