33 lines
1,003 B
Nix
33 lines
1,003 B
Nix
{ nixpkgs, ... }:
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let
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inherit (builtins)
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isFunction
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filter isList
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match isString stringLength
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unsafeDiscardStringContext;
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inherit (nixpkgs.lib.attrsets) foldlAttrs;
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inherit (nixpkgs.lib.lists) flatten subtractLists;
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inherit (nixpkgs.lib.strings) addContextFrom;
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split = strOrList:
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if isList strOrList then flatten strOrList
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else builtins.split "[[:space:]]+" strOrList
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|> filter (flag: isString flag && stringLength flag > 0);
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merge = strOrList: list:
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if isList strOrList then list
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else toString list |> addContextFrom strOrList;
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in substAttrs: strOrList: split strOrList
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|> map (flag: let subst = foldlAttrs (result: regex: subst:
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if result != false then result
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else let groups = match regex flag;
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in if groups == null then false
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else if isFunction subst then subst groups
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else subst)
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false substAttrs;
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in if subst != false then subst else flag)
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|> filter (flag: flag != null)
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|> merge strOrList
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