A simple helper that makes it easy to package Nu scripts with Nix, including inline dependency declarations for external commands and other packaged scripts.
flake
nu
nushell
nix
initial commit
+79
+6
flake.nix
+6
flake.nix
+73
mkNuScript.nix
+73
mkNuScript.nix
···
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{
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pkgs,
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lib ? pkgs.lib,
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self ? null,
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inputs ? { },
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src,
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file,
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name ? baseNameOf (lib.removeSuffix ".nu" file),
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meta ? { },
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system ? pkgs.stdenv.hostPlatform.system,
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nushell ? pkgs.nushell,
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}:
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let
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resolveDependency =
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dep:
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let
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segments = lib.splitString "." dep;
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scope = builtins.head segments;
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rest = builtins.tail segments;
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joinSegments = lib.concatStringsSep ".";
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in
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if (scope == "self" && rest != [ ]) then
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if self != null then
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self.packages.${system}.${joinSegments rest}
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else
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throw "`self` was not passed to `mkNuScript` or is `null`, but a script references a dependency with the `self.` scope."
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else if (scope == "inputs" && rest != [ ]) then
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inputs.${builtins.head rest}.packages.${system}.${joinSegments (builtins.tail rest)}
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else
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pkgs.${dep};
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extraDependencies =
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let
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script = builtins.readFile file;
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lines = lib.splitString "\n" script;
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start = lib.lists.findFirstIndex (line: line == "# START: External Dependencies") null lines;
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end = lib.lists.findFirstIndex (line: line == "# END: External Dependencies") null lines;
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deps =
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if (start != null && end != null) then
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map (line: lib.removePrefix "# " (lib.removePrefix "# " line)) (
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builtins.filter (line: lib.hasPrefix "#" line && line != "#") (
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lib.sublist (start + 1) (end - start - 1) lines
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)
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)
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else
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[ ];
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in
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map resolveDependency deps;
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deps = extraDependencies ++ [ nushell ];
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in
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pkgs.stdenv.mkDerivation {
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inherit name src;
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nativeBuildInputs = with pkgs; [ makeWrapper ];
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installPhase = ''
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runHook preInstall
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mkdir -p $out/bin
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cp $src/${file} $out/bin/${name}
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chmod +x $out/bin/${name}
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substituteInPlace $out/bin/${name} \
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--replace-fail "#!/usr/bin/env nu" "#!${lib.getExe nushell}"
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wrapProgram $out/bin/${name} \
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--set PATH ${lib.makeBinPath deps}
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runHook postInstall
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'';
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meta = meta // {
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mainProgram = name; # override so that mainProgram always matches what the name of the script in $out/bin is
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};
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}