Nix - Die Sprache

rec {  # "rec" erlaubt uns hier, dass wir innerhalb des objects auf properties verweisen können
    aBoolean = true;
    aNumber = 1;
    aString = "1";
    aMultilineString = '' Der whitespace wird bei allen Zeilen getrimmt
        a
        b
        c
    '';
    anArray = [
        aBoolean
        aNumber
        aString
    ];
    anObject = {
        a = 1;
        b = 2;
        c = anArray;
    };
    aConditional = if aBoolean then anObject else anArray; 
    letIn = let
        foo = 1;
        bar = 2;
    in foo+bar;
}

/*

nix-repl> (import ./datatypes.nix).anObject       
{ a = 1; b = 2; c = [ ... ]; }

nix-repl> (import ./datatypes.nix).anArray 
[ true 1 "1" ]

nix-repl> (import ./datatypes.nix).aMultilineString
"a\nb\nc\n"

nix-repl> (import ./datatypes.nix).aConditional    
{ a = 1; b = 2; c = [ ... ]; }

nix-repl> (import ./datatypes.nix).aConditional    
{ a = 1; b = 2; c = [ ... ]; }

nix-repl> (import ./datatypes.nix).letIn
3

*/

rec {
		# Funktionen haben immer nur ein Argument
    sayHello = name: "hello "+name;

		# Braucht man mehrere, fasst man diese zu einem Objekt zusammen
    plus = {a,b}: a+b;

		# Oder gibt eine neue Funktion zurück, der man ein weiteres Argument übergeben kann (currying)
    plusCurried = a: b: a+b;

		# Es gibt auch eine handvoll eingabaute funktionen im "builtins" objekt
    longerThan4Characters = input: (builtins.stringLength input) > 4; # https://nixos.org/manual/nix/stable/language/builtins.html#builtins-stringLength
}

/*

nix-repl> (import ./functions.nix).sayHello "patrik" 
"hello patrik"

nix-repl> (import ./functions.nix).plus {a = 1; b = 3;}
4

nix-repl> (import ./functions.nix).plusCurried 1 3
4

nix-repl> (import ./functions.nix).longerThan4Characters "hello world"
true

*/

let
    nixpkgs = import <nixpkgs> {};
in nixpkgs.stdenv.mkDerivation {
    name = "say-hello";
    src = ./say-hello;
    nativeBuildInputs = [
        nixpkgs.nodePackages.typescript
    ];
    buildInputs = [
        nixpkgs.nodejs-18_x
    ];
    buildPhase = ''
        tsc --out say-hello.js $src/index.ts
    '';
    installPhase = ''
        mkdir -p $out/bin
        cp say-hello.js $out/bin/say-hello2
    '';
}

Derive(
	[
		("out","/nix/store/0l5g8w1wmk7j3q6z7ldkfvcp2xfbpr2w-say-hello","","")
	],
	[
		("/nix/store/182qlb4yhgwcalpfixj54p9avgdyyk48-typescript-4.9.4.drv",["out"]),
		("/nix/store/66c26vpjxagdr5dirdcg27k0jgakq51k-stdenv-linux.drv",["out"]),
		("/nix/store/vqs99ic7qjkjplb7r4qvja3l276avqzq-nodejs-18.13.0.drv",["out"]),
		("/nix/store/wx04vp65xza0916zv3w1xprjc92pa7f8-bash-5.2-p15.drv",["out"])
	],
	[
		"/nix/store/6xg259477c90a229xwmb53pdfkn6ig3g-default-builder.sh",
		"/nix/store/707bbyri4cypp9lrdc7j4kwflncd9xgy-say-hello"
	],
	"x86_64-linux",
	"/nix/store/qqa28hmysc23yy081d178jfd9a1yk8aw-bash-5.2-p15/bin/bash",
	[
		"-e",
		"/nix/store/6xg259477c90a229xwmb53pdfkn6ig3g-default-builder.sh"
	],
	[
		("__structuredAttrs",""),
		("buildInputs","/nix/store/xl6461kig4j53p1cm0b3j9nm4l373g6a-nodejs-18.13.0"),
		("buildPhase","tsc --out say-hello.js $src/index.ts\n"),
		("builder","/nix/store/qqa28hmysc23yy081d178jfd9a1yk8aw-bash-5.2-p15/bin/bash"),
		("cmakeFlags",""),
		("configureFlags",""),
		("depsBuildBuild",""),
		("depsBuildBuildPropagated",""),
		("depsBuildTarget",""),
		("depsBuildTargetPropagated",""),
		("depsHostHost",""),
		("depsHostHostPropagated",""),
		("depsTargetTarget",""),
		("depsTargetTargetPropagated",""),
		("doCheck",""),
		("doInstallCheck",""),
		("installPhase","mkdir -p $out/bin\ncp say-hello.js $out/bin/say-hello2\n"),
		("mesonFlags",""),
		("name","say-hello"),
		("nativeBuildInputs","/nix/store/v678yfnj4c0bw8rcy01sf7rgi9j5n29d-typescript-4.9.4"),
		("out","/nix/store/0l5g8w1wmk7j3q6z7ldkfvcp2xfbpr2w-say-hello"),
		("outputs","out"),
		("patches",""),
		("propagatedBuildInputs",""),
		("propagatedNativeBuildInputs",""),
		("src","/nix/store/707bbyri4cypp9lrdc7j4kwflncd9xgy-say-hello"),
		("stdenv","/nix/store/3yfs41f4b60jya2gk6xikx4s97zsxjr0-stdenv-linux"),
		("strictDeps",""),
		("system","x86_64-linux")
	]
)