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CONTRIBUTING.md

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Contributing to the formal ledger specifications

Style guidelines

We are currently aspiring to follow the Agda standard library style guide as much as reasonable. Since some of our code will be rendered into a PDF, the formatting of the PDF takes priority over formatting of the code, so deviations are to be expected.

We also have a separate style guide for formatting the PDF: PDF style guide.

Setup with emacs

We use Agda version 2.6.4 and various dependencies. You can install the correct version of Agda and the dependencies using nix-env -iA agda -f ., but this is a global install which you may not want if you also have other Agda projects.

To install Agda locally and use that install with emacs, you can do the following:

  • Build agda and agda-mode binaries by invoking the following: nix-build -A agdaWithDeps -o ~/IOHK/ledger-agda. You can replace ~/IOHK/ledger-agda with whatever path you like, just make sure to replace it in my/agda-versions below as well.

    Note. You need not have built/installed Agda prior to invoking this nix-build command (though it's okay if you have).

    Note. To instruct the Makefile to use this local Agda binary, invoke it like so: AGDA=~/IOHK/ledger-agda make -C src/

  • Put the following into your init file (highlight and M-x eval-region to load it without restarting emacs).

    ;; Defines a function `my/switch-agda' that switches between different
;; `agda' executables defined in `my/agda-versions'. The first entry of
;; `my/agda-versions' is assumed to be the default Agda.
;;
;; If there are two entries in `my/agda-versions', `my/switch-agda' toggles
;; between the two. If there are more entries, it will ask which one
;; to choose.

(setq my/agda-versions `(("Agda"        "2.6.3" "agda")
                         ("Ledger Agda" "2.6.4" "~/IOHK/ledger-agda/bin/agda")))

(setq my/selected-agda (caar my/agda-versions))

(defun my/switch-agda (name version path)
  (interactive
   (cond ((> (length my/agda-versions) 2)
          (assoc (completing-read "Agda" my/agda-versions '(lambda (x) 't) 't) my/agda-versions))
         ((= (length my/agda-versions) 2)
          (car (seq-filter '(lambda (x) (not (string= my/selected-agda (car x)))) my/agda-versions)))
         (t (error "my/agda-versions needs to have at least two elements!"))))
  (message "Selecting %s, version %s" name version)
  (setq my/selected-agda   name
        agda2-version      version
        agda2-program-name path)
  (agda2-restart))

(with-eval-after-load 'agda2-mode (define-key agda2-mode-map (kbd "C-c C-x C-t") 'my/switch-agda))

    Note. This assumes that your regular install of Agda is in your path with the name agda and version 2.6.3, otherwise you'll have to edit my/agda-versions.

    You can then use M-x my/toggle-ledger-agda, or C-c C-x C-t, to switch between your regular install of Agda and the locally installed version.

    There are other options as well, but this should work with all kinds of custom emacs setups or distributions (assuming there isn't already some other stuff going on with your Agda setup).

Setup with nix-shell

nix-shell provides Agda complete with the correct dependencies. So you should be able to run your preferred editor within nix-shell and it should see the required agda executable.

Building the PDF quickly

The Makefile can be used to build the PDF without having to build everything else. Either run make from within nix-shell, or use

nix-shell --command 'make docs'

to run make without launching an interactive shell.

This combines well with the ability to invoke the TeX backend of Agda within Emacs, which is much faster when you have already loaded an Agda file/interface.

Building other artifacts

Apart from the PDF specification, the Makefile can be used to also generate the following:

  • make html: generate HTML under dist/html/
  • make hs: generate Haskell code under dist/MAlonzo/
  • make hsTest: run the Haskell tests of each Agda formalisation
  • make staticWebsite: gather all resources above in a central webpage dist/index.html

If you only want to command to affect a single project, prefix with <project>., e.g.

$ make ledger.html
$ make midnight.hs

Updating nixpkgs

To update the default nixpkgs used to build the derivations, run

niv update nixpkgs -r <revision>

or

niv update nixpkgs -v <version>

For example:

niv update nixpkgs -r 4e329926df7ee5fa49929a83d31ee7d541f8b45c
niv update nixpkgs -v 21.11.337905.902d91def1e

Maintainer

This repository is maintained by @WhatisRT.