mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-27 16:16:16 +02:00
7349bd0176
* `sub' to subtract two numbers. * `stringLength' to get the length of a string. * `substring' to get a substring of a string. These should be enough to allow most string operations to be expressed.
26 lines
516 B
Nix
26 lines
516 B
Nix
with builtins;
|
|
|
|
rec {
|
|
|
|
fold = op: nul: list:
|
|
if list == []
|
|
then nul
|
|
else op (head list) (fold op nul (tail list));
|
|
|
|
concat =
|
|
fold (x: y: x + y) "";
|
|
|
|
flatten = x:
|
|
if isList x
|
|
then fold (x: y: (flatten x) ++ y) [] x
|
|
else [x];
|
|
|
|
sum = fold (x: y: add x y) 0;
|
|
|
|
hasSuffix = ext: fileName:
|
|
let lenFileName = stringLength fileName;
|
|
lenExt = stringLength ext;
|
|
in !(lessThan lenFileName lenExt) &&
|
|
substring (sub lenFileName lenExt) lenFileName fileName == ext;
|
|
|
|
}
|