32 lines
658 B
Nix
32 lines
658 B
Nix
_inputs: _self: super: let
|
|
inherit
|
|
(super.lib)
|
|
unique
|
|
foldl'
|
|
filter
|
|
;
|
|
|
|
# Counts how often each element occurrs in xs.
|
|
# Elements must be strings.
|
|
countOccurrences =
|
|
foldl'
|
|
(acc: x: acc // {${x} = (acc.${x} or 0) + 1;})
|
|
{};
|
|
# Returns all elements in xs that occur at least twice
|
|
duplicates = xs: let
|
|
occurrences = countOccurrences xs;
|
|
in
|
|
unique (filter (x: occurrences.${x} > 1) xs);
|
|
writeText = text: (super.writeText (builtins.hashString "sha256" "${text}") "${text}");
|
|
in {
|
|
lib =
|
|
super.lib
|
|
// {
|
|
inherit
|
|
countOccurrences
|
|
duplicates
|
|
writeText
|
|
;
|
|
};
|
|
}
|