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lib/modules.nix: small eval optimization (foldl' + foldl' + attrNames -> foldl' + mapAttrs)

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danbst 2019-01-26 21:43:11 +02:00
parent f32987d451
commit aa2e63ce5e
1 changed files with 14 additions and 12 deletions
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22
lib/modules.nix
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@ -214,23 +214,25 @@ rec {
qux = [ "module.hidden=baz,value=bar" "module.hidden=fli,value=gne" ];
}
*/
byName = attr: f: modules: foldl' (acc: module:
foldl' (inner: name:
inner // { ${name} = (acc.${name} or []) ++ (f module module.${attr}.${name}); }
) acc (attrNames module.${attr})
byName = attr: f: modules:
foldl' (acc: module:
acc // (mapAttrs (n: v:
(acc.${n} or []) ++ f module v
) module.${attr}
)
) {} modules;
# an attrset 'name' => list of submodules that declare ‘name’.
declsByName = byName "options"
(module: option: [{ inherit (module) file; options = option; }])
options;
declsByName = byName "options" (module: option:
[{ inherit (module) file; options = option; }]
) options;
# an attrset 'name' => list of submodules that define ‘name’.
defnsByName = byName "config" (module: value:
map (config: { inherit (module) file; inherit config; }) (pushDownProperties value)
) configs;
# extract the definitions for each loc
defnsByName' = byName "config"
(module: value: [{ inherit (module) file; inherit value; }])
configs;
defnsByName' = byName "config" (module: value:
[{ inherit (module) file; inherit value; }]
) configs;
in
(flip mapAttrs declsByName (name: decls:
# We're descending into attribute ‘name’.