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lib/util: add groupListBySize

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Splits up a list into many sub-lists based on the given max-size.

e.g.
```nix
groupListBySize 2 [ 1 2 3 4 5 ]
=> [ [ 1 2 ] [ 3 4 ] [ 5 ] ]
```
This commit is contained in:
Matt Sturgeon 2024-08-19 00:45:47 +01:00
parent 693e749edb
commit 8f99c3953c
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3 changed files with 61 additions and 0 deletions
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41
tests/lib-tests.nix
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@ -333,6 +333,47 @@ let
"MIxEd"
];
};
testGroupListBySize = {
expr = {
empty = helpers.groupListBySize 5 [ ];
"5/5" = helpers.groupListBySize 5 (lib.genList lib.id 5);
"13/5" = helpers.groupListBySize 5 (lib.genList lib.id 13);
};
expected = {
empty = [ ];
"5/5" = [
[
0
1
2
3
4
]
];
"13/5" = [
[
0
1
2
3
4
]
[
5
6
7
8
9
]
[
10
11
12
]
];
};
};
};
in
if results == [ ] then