58 lines
1.4 KiB
Nix
58 lines
1.4 KiB
Nix
{ nixpkgs, ... }:
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let
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inherit (builtins)
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isAttrs
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isInt
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length
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match
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toString;
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inherit (nixpkgs.lib.asserts)
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assertMsg;
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inherit (nixpkgs.lib.attrsets)
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isDerivation
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mapAttrsToList
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mergeAttrsList;
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inherit (nixpkgs.lib.lists)
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flatten;
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inherit (nixpkgs.lib.strings)
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concatStrings
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concatStringsSep
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escape;
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isKey = str: match "[0-9A-Z][0-9A-Zx_]*" str != null;
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isNum = str: match "(0x[0-9A-Fa-f]+|[1-9][0-9]*)" str != null;
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mkValueString = v: let
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v' = toString v;
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in if v == true then "y"
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else if isInt v || isNum v' then v'
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else "\"${escape [ "\"" ] v'}\"";
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in rec {
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flattenAttrs = let
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compose = p: n: if isKey n then p ++ [ n ] else p;
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recurse = p: v:
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if isValue v then { ${concatStringsSep "_" p} = v; }
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else mapAttrsToList (n: v: recurse (compose p n) v) v;
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in attrs: recurse [ ] attrs |> flatten |> mergeAttrsList;
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option = v: { _option = v; };
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isValue = x: isAttrs x -> !isDerivation x -> x ? _option;
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isOptional = x: isAttrs x && !isDerivation x && x ? _option;
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getValue = x: if isOptional x then x._option else x;
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mkKey = n: assert isKey n; "CONFIG_${n}";
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mkKeyValue = n: v: let
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v' = getValue v;
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in if (v' == false || v' == null)
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then "# ${mkKey n} is not set"
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else "${mkKey n}=${mkValueString v'}";
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mkConfig = attrs: mapAttrsToList (k: v: mkKeyValue k v + "\n") attrs
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|> concatStrings;
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}
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