Idris2/INSTALL.md

Installation

• Installing with a package manager
• Installing from source
• Installing Chez Scheme on Apple Silicon

Installing with a package manager

You can install Idris 2 with any one of a number of package managers.

Installing with Pack

Pack comes with an installation of Idris 2, so you just need to install Pack. See the installation instructions on GitHub.

Installing with Homebrew

brew install idris2

Installing with Nix

nix-env -i idris2

Installing with Nix Flakes

nix profile install github:idris-lang/Idris2

Installing from source

The easiest way to install from source is via the existing generated Scheme code. The requirements are:

• A Scheme compiler; either Chez Scheme (default), or Racket.
• bash, GNU make, gcc or clang, sha256sum and GMP. On Linux, you probably already have these. On macOS and major BSD flavours, you can install them using a package manager: for instance, on macOS, you can install with the brew install coreutils gmp and on OpenBSD, with the pkg_add coreutils bash gmake gmp command. You specifically need the dev GMP library, which means on some systems the package you need to install will be named something more like libgmp3-dev. macOS ships with clang whereas gcc is more common for other *nix distributions.

On Windows, it has been reported that installing via MSYS2 works MSYS2. On Windows older than Windows 8, you may need to set an environment variable OLD_WIN=1 or modify it in config.mk.

On Raspberry Pi, you can bootstrap via Racket.

By default, code generation is via Chez Scheme. You can use Racket instead, by setting the environment variable IDRIS2_CG=racket before running make. If you install Chez Scheme from source files, building it locally, make sure you run ./configure --threads to build multithreading support in.

NOTE: On FreeBSD, OpenBSD and NetBSD you need to use gmake command instead of make in the following steps.

NOTE: If you're running macOS on Apple Silicon (arm64) you will need to use Chez scheme version 10.0.0 or greater. Homebrew has been updated to ship Chez Scheme 10+ as of this writing. If you cannot install Chez Scheme 10+, install the Racket fork of chez scheme as described below. If you install gmp via homebrew, you will also need to export CPATH=/opt/homebrew/include.

1: Set installation target directory

• Change the PREFIX in config.mk to the absolute path of your chosen installation destination. The default is to install in $HOME/.idris2

If you have an existing Idris 2, go to Step 3. Otherwise, read on...

Make sure that:

• $PREFIX/bin is in your PATH

Further, on Apple silicon Macs (M1/M2), you need to set the following environment variables:

export IDRIS2_LIBS=/opt/homebrew/lib
export CPATH=/opt/homebrew/include:/opt/homebrew/lib

2: Installing without an existing Idris 2

You can build from pre-built Chez Scheme source, as long as you have Chez Scheme installed (or, alternatively, Racket). To do this, enter one of the following:

• make bootstrap SCHEME=chez
• make bootstrap-racket

chez is the executable name of the Chez Scheme compiler. You may need to replace this with the executable for Chez Scheme on your system. This could be scheme, chezscheme or chezscheme9.5 or something else, depending on your system and the Chez Scheme version.

This builds an Idris 2 compiler from scheme code output from a working Idris 2 compiler (which isn't necessarily up to date, but is up to date enough to build the current repository). It then rebuilds using the result, and runs the tests.

If all is well, to install, type:

• make install

If you are building with Racket, you'll need to run IDRIS2_CG=racket make install.

3: Installing with an existing Idris 2

If you have the latest released version of Idris 2 (0.6.0 at the time of writing) installed:

• make all
• make install

4: (Optional) Installing Idris 2 library documentation

After make install, type make install-libdocs to install Idris 2 library documentation. After that, the index file can be found here: "${BROWSER:-echo}" "$(idris2 --libdir)"/docs/index.html

5: (Optional) Self-hosting step

As a final step, you can rebuild from the newly installed Idris 2 to verify that everything has worked correctly. Assuming that idris2 is in your PATH.

• make clean -- to make sure you're building everything with the new version
• make all && make install -- OR make all IDRIS2_BOOT='idris2 --codegen racket' && make install if using Racket.

6: Running tests

After make all, type make test to check everything works. This uses the executable in ./build/exec.

7: (Optional) Enabling incremental compilation

If you are working on Idris, incremental compilation means that rebuilds are much faster, at the cost of runtime performance being slower. To enable incremental compilation for the Chez backend, set the environment variable IDRIS2_INC_CGS=chez, or set the --inc chez flag in idris2.ipkg.

8: (Optional) Installing the Idris 2 API

You'll only need this if you're developing support tools, such as an external code generator. To do so, once everything is successfully installed, type:

• make install-api

The API will only work if you've completed the self-hosting step (step 5), since the intermediate code versions need to be consistent throughout. Otherwise, you will get an Error in TTC: TTC data is in an older format error.

9: (Optional) Shell Auto-completion

Idris2 supports tab auto-completion for Bash-like shells.

For Bash Users

From within bash, run the following command:

eval "$(idris2 --bash-completion-script idris2)"

You can also add it to your .bashrc file.

For ZSH Users

From within ZSH, run the following commands:

eval "$(idris2 --zsh-completion-script idris2)"

ZSH auto-completion is implemented via bashcompinit.

You can also add them to your .zshrc file.

Troubleshooting

If you get the message variable make-thread-parameter is not bound while bootstrapping via Chez Scheme, or while running the tests when bootstrapping via Racket, then your copy of Chez Scheme was built without thread support. Pass --threads to ./configure while building Chez Scheme to correct the issue.

Running in text editor

Run on emacs using nix flakes

If you are a nix flakes user you can run Idris 2 in emacs by running the following command:

nix run github:idris-lang/Idris2#emacs-with-idris idrisCode.idr

Installing Chez Scheme on Apple Silicon

Chez scheme only supports Apple Silicon for versions 10.0.0 or newer.

Homebrew bundles Chez Scheme 10+ so if that's your manager of choice, you don't need to read on.

If you cannot install that new of a version of Chez Scheme, you will need to build and install the Racket fork of chez scheme.

git clone git@github.com:racket/ChezScheme.git
cd ChezScheme
./configure --threads
make
sudo make install