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flake.nix
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flake.nix
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{
description = "Nuenv: a Nushell environment for Nix";
inputs = {
nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz"; # Provides Nushell v0.87.1
rust-overlay = {
url = "github:oxalica/rust-overlay";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs = { self, nixpkgs, rust-overlay }:
let
supportedSystems = [
"x86_64-linux" # 64-bit Intel/AMD Linux
"aarch64-linux" # 64-bit ARM Linux
"x86_64-darwin" # 64-bit Intel macOS
"aarch64-darwin" # 64-bit ARM macOS
];
forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
pkgs = import nixpkgs {
inherit system;
overlays = [
self.overlays.nuenv # Supply nixpkgs.nuenv.mkDerivation
rust-overlay.overlays.default
(final: prev: {
rustToolchain = prev.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
})
];
};
inherit system;
});
in
{
overlays = rec {
default = nuenv;
nuenv = final: prev: {
nuenv = {
mkDerivation = self.lib.mkNushellDerivation
# Provide Nushell package
prev.nushell
# Provide default system
prev.system;
writeScriptBin = self.lib.mkNushellScript
# Provide Nushell package
prev.nushell
# Provide helper function
prev.writeTextFile;
# TODO: mkShell
};
};
};
lib =
let internalLib = import ./lib/nuenv.nix;
in {
/*
mkNushellDerivation creates a nushell derivation builder
Type:
[package] -> [string] -> package
Example:
let nushellBuilder = mkNuShellDerivation
pkgs.nushell
pkgs.stdenv.hostPlatform.system;
*/
mkNushellDerivation =
# nushell package to use for derivation build environment
nushellPkg:
# system as a string
system:
internalLib.mkNushellDerivation nushellPkg system;
/*
mkNushellScript creates a nushell script builder
Type:
[string] -> [string] -> package
Example:
let mkNushellScript = mkNushellScript
pkgs.nushell
pkgs.writeTextFile;
let outScript = mkNushellScript
"repair-infra.nu"
''
print -e "(ansi red)fixing infrastructure(ansi reset)"
print "dont_crash_anymore=true" | save -a server_config.toml
'';
*/
mkNushellScript =
# nushell package to use for script shebang/execution
nushellPkg:
# function to use for writing out script (example: pkgs.writeTextFile)
writeTextFile:
internalLib.mkNushellScript nushellPkg writeTextFile;
};
devShells = forAllSystems ({ pkgs, system }: {
default = pkgs.mkShell {
packages = with pkgs; [ nushell ];
};
ci = pkgs.mkShell {
packages = with pkgs; [ cachix direnv nushell ];
};
# A dev environment with Nuenv's helper functions available
nuenv = pkgs.mkShell {
packages = with pkgs; [ nushell ];
shellHook = ''
nu --config ${./nuenv/user-env.nu}
'';
};
});
packages = forAllSystems ({ pkgs, system }: rec {
default = hello;
run-me = pkgs.nuenv.writeScriptBin {
name = "run-me";
script = ''
def color [color: string, msg: string] { $"(ansi $color)($msg)(ansi reset)" }
def info [msg: string] { print $"(color "blue" "INFO"): ($msg)" }
def success [msg: string] { print $"(color "green" $msg)" }
info $"Hello, NixCon (date now | format date "%Y")!"
info "So lovely to see everyone today"
info "Conference status:"
success "SUCCESS"
info "Nearing completion..."
info "Script status:"
success "DONE"
'';
};
nuenv-commands = pkgs.writeScriptBin "nuenv-commands" ''
${pkgs.nushell}/bin/nu --env-config ${./nuenv/user-env.nu} --commands "nuenvCommands"
'';
# For NixCon
hello = pkgs.nuenv.mkDerivation {
name = "hello-nix-nushell";
packages = [ pkgs.hello ];
src = ./.;
build = builtins.readFile ./example/hello.nu;
MESSAGE = "Hello from Nix + Bash";
};
# An example Nushell-based derivation
nixcon = pkgs.nuenv.mkDerivation {
name = "hello-nixcon";
packages = [ pkgs.hello ];
src = ./.;
build = builtins.readFile ./example/hello.nu;
MESSAGE = "NixCon ❄️! Servus, grüezi, hallo, und hallöchen 😄";
};
# The Nushell-based derivation above but with debug mode disabled
helloNoDebug = pkgs.nuenv.mkDerivation {
name = "hello-nix-nushell";
packages = [ pkgs.hello ];
src = ./.;
build = builtins.readFile ./example/hello.nu;
debug = false;
MESSAGE = "Hello from Nix + Bash, but no debugging this time";
};
# A non-overlay version
direct = self.lib.mkNushellDerivation pkgs.nushell system {
name = "no-overlay";
src = ./.;
build = ''
let share = $"($env.out)/share"
(version).version | save nushell-version.txt
mkdir $share
cp nushell-version.txt $share
'';
};
# Show that Nuenv works when drawing sources from GitHub
githubSrc = pkgs.nuenv.mkDerivation {
name = "advanced-nix-nushell";
src = pkgs.fetchFromGitHub {
owner = "DeterminateSystems";
repo = "nuenv";
rev = "c8adf22d9cdc61d4777ad4b9d193e9b22547419e";
sha256 = "sha256-fu4WTFHlceasWpi6zF0nlent4KSmPAdsiKTrGixDEiI=";
};
build = ''
let share = $"($env.out)/share"
mkdir $share
cp README.md $share
'';
};
# The same derivation above but using the stdenv
stdenv = pkgs.stdenv.mkDerivation {
name = "just-experimenting";
buildInputs = [ pkgs.hello ];
src = ./.;
buildPhase = ''
hello --greeting "''${MESSAGE}" > hello.txt
substituteInPlace hello.txt --replace "Bash" "Nushell"
'';
installPhase = ''
mkdir -p $out/share
cp hello.txt $out/share
'';
MESSAGE = "Hello from Nix + Bash";
};
# Simple that relies on the Nushell derivation
other = pkgs.stdenv.mkDerivation {
name = "other";
src = ./.;
installPhase = ''
ls ${self.packages.${system}.hello}
mkdir -p $out/share
cp ${self.packages.${system}.hello}/share/hello.txt $out/share/copied.txt
'';
};
# An Nushell-based derivation that errors
error = pkgs.nuenv.mkDerivation {
name = "throws-nushell-error";
src = ./.;
build = builtins.readFile ./example/error.nu;
};
});
};
}