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Hazel Installation Guide

This guide contains step-by-step instructions for building and running Hazel. If you are unfamiliar with ocaml or opam or get stuck, we recommend you follow these instructions instead of the shorter instructions in the README.md.

Prerequisites

  • If you are on Windows, install the Windows Subsystem for Linux (WSL) by doing the following.

    • WSL has to be enabled before it can be installed. So, to enable WSL, do the following:

      • From the start menu or task bar, open the "PowerShell" application as an administrator (by right-clicking on it when you search for it in the start menu). This will open a PowerShell command prompt.

      • Run the following command at the PowerShell prompt:

        Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux

      • When this command asks you if you want to reboot, reboot by pressing y.

    • After enabling WSL, to install WSL, go the to Microsoft Store, and search for and install "Ubuntu". This will install WSL and the Ubuntu Linux distribution.

    • From the start menu or taskbar, open the "Ubuntu" application. This will open a Bash shell on Ubuntu Linux. Use this when running the commands in the rest of these instructions.

  • If you are on MacOS, make sure you have Homebrew installed.

  • Make sure gcc, git, make, and m4 are installed.

    • If you are on Ubuntu or Windows, you can do this by running the following commands:

      sudo apt update
      sudo apt install gcc git make m4 pkg-config

    • If you are on MacOS, we recommend using the built-in m4 (i.e., not the one from Homebrew).

      You can install the remaining programs (i.e., gcc, git, and make) by running the following commands:

      brew update
      brew install gcc git make pkg-config

Install and Initialize opam

  • Install the most recent version of opam (which must be at least 2.0):

    • If you are on Ubuntu Linux 19.04 (disco) or later, you can do this by running the following commands:

      sudo apt update
      sudo apt install opam

    • If you are on MacOS, you can do this by running the following commands:

      brew update
      brew install opam

  • Check that you have the correct version of opam by running the following command:

    opam --version

    This should report version 2.0 or greater. If it does not, the following instructions may not work.

  • Initialize opam, by running:

    • If you are on Windows:

      opam init --disable-sandboxing

    • If you are on Linux or MacOS:

      opam init

  • Enable opam for the current shell with the following:

    eval $(opam env)

Install OCaml

  • Update the list of available opam packages:

    opam update

  • Install OCaml 4.08.1 (some older versions may also work, but see the "Current version" section of Updating.md for why we do not use newer versions).

    opam switch create 4.08.1 ocaml-base-compiler.4.08.1

Clone the Source Code

  • Pick a directory that you want to be the parent of the directory that contains the Hazel source code and use the cd command to change to that directory.

  • Clone a copy of the source code by either running the following command:

    git clone [email protected]:hazelgrove/hazel.git

    Or running the following command:

    git clone https://github.com/hazelgrove/hazel.git

    This will put create a hazel directory containing the Hazel source code inside the current directory.

    If you plan to git push or git pull frequently, you may want to consider configuring your GitHub account to work with your SSH key. This will prevent you from having type your password every time. For more information, see the GitHub documentation on Connecting to GitHub with SSH and Troubleshooting SSH.

Install Library Dependencies

  • Use the cd command to change to the directory containing the Hazel source code. If you just ran the git clone command, you can do this by running the following command:

    cd hazel

  • If you run ls, you should see some files like the following:

    dune-project
LICENSE
Makefile
README.md
src
UPDATING.md

    If you do not see these files, use cd to change to the directory containing the Hazel source code.

  • Run the following to install the necessary OCaml library dependencies:

    make deps

Compile Hazel

  • You can now compile Hazel by running one of the following.

    • If you want to compile a development version of Hazel, run make (or equivalently, make dev)

    • If you want to compile a release version of Hazel, which optimizes more aggressively, run make release

If the build fails, it sometimes helps to do a make clean.

Run Hazel

  • Once Hazel is compiled, you can see it in action by running one of the following commands.

    • If you are on Linux, you can launch Hazel with BROWSER $(make echo-html) where (depending on your installed operating system and browser) BROWSER is probably one of:

      • firefox,
      • chrome,
      • chrome-browser,
      • chromium, or
      • chromium-browser.

      As a convenience, we have provided the following shorthand make targets:

      • make firefox
      • make chrome
      • make chrome-browser
      • make chromium
      • make chromium-browser

      On some setups, you can also use xdg-open to open your default browser. The make xdg-open shorthand invokes xdg-open $(make echo-html).

    • If you are on MacOS, you can use the above or you can launch Hazel with open $(make echo-html) or make open more concisely.

    • If you are on Windows, the path to the browser may not be so easy to type, so you can use the following commands to launch Hazel in your browser:

      • make win-firefox
      • make win-chrome

You can also launch Hazel directly by opening _build/default/src/hazelweb/www/index.html in your browser. The command make echo-html echos that path to the terminal, so that you don't have to remember it.

You can also run make repl to get a REPL in which you can play with the definitions in hazelcore. The definitions in hazelweb cannot be used in the REPL because that package needs a browser environment to run.

(Optional) Install fswatch for automatic reformatting & recompilation

Do this if you want to be able to run make watch to automatically watch the Hazel source for changes, triggering reformatting and recompilation.

  • If you are on Ubuntu/Debian, you can do this by running the following commands:

    sudo apt install fswatch
opam install fswatch

  • If you are on MacOS, you can do this by running the following commands:

    brew install fswatch
opam install fswatch