58 lines
1.8 KiB
Nix
58 lines
1.8 KiB
Nix
with builtins;
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let
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lowerChars = stringToCharacters "abcdefghijklmnopqrstuvwxyz";
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upperChars = stringToCharacters "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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stringToCharacters = s: genList (p: substring p 1 s) (stringLength s);
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in
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rec {
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splitLines = s: filter (x: !isList x) (split "\n" s);
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concatStrings = concatStringsSep "";
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attrsToList = a:
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map (name: { inherit name; value = a.${name}; }) (builtins.attrNames a);
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replaceStringsRec = from: to: string:
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# recursively replace occurrences of `from` with `to` within `string`
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# example:
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# replaceStringRec "--" "-" "hello-----world"
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# => "hello-world"
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let
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replaced = replaceStrings [ from ] [ to ] string;
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in
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if replaced == string then string else replaceStringsRec from to replaced;
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toLower = replaceStrings upperChars lowerChars;
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squash = replaceStringsRec "\n\n\n" "\n\n";
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trim = string:
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# trim trailing spaces and squash non-leading spaces
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let
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trimLine = line:
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let
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# separate leading spaces from the rest
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parts = split "(^ *)" line;
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spaces = head (elemAt parts 1);
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rest = elemAt parts 2;
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# drop trailing spaces
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body = head (split " *$" rest);
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in spaces + replaceStringsRec " " " " body;
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in concatStringsSep "\n" (map trimLine (splitLines string));
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# FIXME: O(n^2)
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unique = foldl' (acc: e: if elem e acc then acc else acc ++ [ e ]) [];
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nameValuePair = name: value: { inherit name value; };
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filterAttrs = pred: set:
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listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
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optionalString = cond: string: if cond then string else "";
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indent = prefix: s:
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concatStringsSep "\n" (map (x: if x == "" then x else "${prefix}${x}") (splitLines s));
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}
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