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lib: eachSystem: inline single-use local variables

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Inline single-use local variables to minimize cognitive load while
reading the code, unless they cache computational results.
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NAHO 2024-09-11 19:45:32 +02:00
parent 274ed073aa
commit ce5c962a8c
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1 changed files with 27 additions and 26 deletions
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53
lib.nix
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@ -29,37 +29,38 @@ let
# Builds a map from <attr>=value to <attr>.<system>=value for each system.
eachSystem =
systems: f:
let
# Merge outputs for each system.
op =
builtins.foldl'
(
# Merge outputs for each system.
attrs: system:
let
ret = f system;
op =
attrs: key:
attrs
// {
${key} = (attrs.${key} or { }) // {
${system} = ret.${key};
};
};
in
builtins.foldl' op attrs (builtins.attrNames ret);
in
builtins.foldl' op { } (
systems
++
# Add the current system if the --impure flag is used.
(
if builtins ? currentSystem then
if builtins.elem builtins.currentSystem systems then
[ ]
builtins.foldl' (
attrs: key:
attrs
// {
${key} = (attrs.${key} or { }) // {
${system} = ret.${key};
};
}
) attrs (builtins.attrNames ret)
)
{ }
(
systems
++
# Add the current system if the --impure flag is used.
(
if builtins ? currentSystem then
if builtins.elem builtins.currentSystem systems then
[ ]
else
[ builtins.currentSystem ]
else
[ builtins.currentSystem ]
else
[ ]
)
);
[ ]
)
);
# eachSystemMap using defaultSystems
eachDefaultSystemMap = eachSystemMap defaultSystems;