Generate flake.nix from module options. Discussions: https://oeiuwq.zulipchat.com/join/nqp26cd4kngon6mo3ncgnuap/
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oeiuwq.com
dendritic
nix
inputs
1lib:
2let
3
4 isNonEmptyString = s: lib.isStringLike s && lib.stringLength (lib.trim s) > 0;
5
6 isEmpty =
7 x:
8 (
9 (builtins.isNull x)
10 || (lib.isStringLike x && lib.stringLength (lib.trim x) == 0)
11 || (lib.isList x && lib.length x == 0)
12 || (lib.isAttrs x && x == { })
13 );
14
15 mergeNonEmpty =
16 from: name:
17 {
18 testEmpty ? isEmpty,
19 onEmptyMerge ? { },
20 nonEmptyMerge ? {
21 ${name} = from.${name};
22 },
23 }:
24 acc: acc // (if (!from ? ${name}) || testEmpty from.${name} then onEmptyMerge else nonEmptyMerge);
25
26 mergeNonEmptyAttrs =
27 from: attrs:
28 let
29 m = mergeNonEmpty from;
30 ops = lib.mapAttrsToList (name: spec: (m name spec)) attrs;
31 in
32 lib.pipe { } ops;
33
34 nonEmptyInputs = input: {
35 nonEmptyMerge = {
36 inputs = inputsFollow input.inputs;
37 };
38 };
39
40 inputsFollow = lib.mapAttrs (
41 _: input:
42 mergeNonEmptyAttrs input {
43 follows = {
44 testEmpty = v: !builtins.isString v;
45 };
46 inputs = nonEmptyInputs input;
47 }
48 );
49
50 inputsExpr = lib.mapAttrs (
51 _name: input:
52 mergeNonEmptyAttrs input {
53 url = { };
54 type = { };
55 submodules = { };
56 owner = { };
57 repo = { };
58 path = { };
59 id = { };
60 dir = { };
61 narHash = { };
62 rev = { };
63 ref = { };
64 host = { };
65 flake = {
66 testEmpty = v: v;
67 nonEmptyMerge = {
68 flake = false;
69 };
70 };
71 follows = {
72 testEmpty = x: !builtins.isString x;
73 };
74 inputs = nonEmptyInputs input;
75 }
76 );
77
78in
79{
80 inherit inputsExpr isNonEmptyString;
81}