ak-nix's Introduction

ak-nix

Various nix and NixOS extensions

Outputs

REPL Extensions

The output ak-nix#repl holds convenience functions for use in a Nix REPL. The highlights are ls which behaves like your shell's ls command, pwd which does exactly what you think, and show which uses builtins.trace to print values or lists of values to the console.

nix-repl> :a ( builtins.getFlake "ak-nix" ).repl
nix-repl> pwd
/home/sally/src/ak-nix
nix-repl> ls "./*"
trace: 
./attrsets.nix
./debug.nix
./default.nix
./filesystem.nix
./json.nix
./lists.nix
./paths.nix
./repl.nix
./stdenv.nix
./strings.nix
true
nix-repl> show ["oh" "dip" ( it: "is" ) 420]
trace:
oh
dip
<LAMBDA>
420
true

Lib

A set of extensions to nixpkgs.lib. This is constructed using nixpkgs.lib.extend, so it can be used as an alternate in existing expressions which already take lib as an argument.

The lib attribute contains librepl and is available as at the top-level, or as a subdir flake:

nix-repl> lib = builtins.getFlake "github:aakropotkin/ak-nix?dir=lib"
nix-repl> :a lib.librepl
nix-repl> pwd
/home/sally/src/ak-nix
nix-repl> add = curryDefaultSystems' ( system:
                  { x, y }: builtins.trace system ( x + y ) )
nix-repl> add { x = 1; y = 2; }
{ __functor      = <lambda>;
  aarch64-darwin = 3; trace: aarch64-darwin
  aarch64-linux  = 3; trace: aarch64-linux
  i686-linux     = 3; trace: i686-linux
  x86_64-darwin  = 3; trace: x86_64-darwin
  x86_64-linux   = 3; trace: x86_64-linux
}
nix-repl> ( add { x = 2; y = 2; } ).x86_64-linux
3
nix-repl> ( add { x = 3; y = 2; } ) "x86_64-linux"
trace: x86_64-linux
5
nix-repl> add "x86_64-linux" { x = 4; y = 20; }
trace: x86_64-linux
24

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