mirror of
https://github.com/ilyakooo0/nixpkgs.git
synced 2024-11-11 15:27:20 +03:00
41 lines
1.0 KiB
Nix
41 lines
1.0 KiB
Nix
rec {
|
|
|
|
# Identity function.
|
|
id = x: x;
|
|
|
|
# Constant function.
|
|
const = x: y: x;
|
|
|
|
# Named versions corresponding to some builtin operators.
|
|
concat = x: y: x ++ y;
|
|
or = x: y: x || y;
|
|
and = x: y: x && y;
|
|
mergeAttrs = x: y: x // y;
|
|
|
|
# Take a function and evaluate it with its own returned value.
|
|
fix = f: let result = f result; in result;
|
|
|
|
# Flip the order of the arguments of a binary function.
|
|
flip = f: a: b: f b a;
|
|
|
|
# Pull in some builtins not included elsewhere.
|
|
inherit (builtins)
|
|
pathExists readFile isBool isFunction
|
|
isInt add sub lessThan
|
|
seq deepSeq genericClosure;
|
|
|
|
# Return the Nixpkgs version number.
|
|
nixpkgsVersion =
|
|
let suffixFile = ../.version-suffix; in
|
|
readFile ../.version
|
|
+ (if pathExists suffixFile then readFile suffixFile else "pre-git");
|
|
|
|
# Whether we're being called by nix-shell.
|
|
inNixShell = builtins.getEnv "IN_NIX_SHELL" == "1";
|
|
|
|
# Return minimum/maximum of two numbers.
|
|
min = x: y: if x < y then x else y;
|
|
max = x: y: if x > y then x else y;
|
|
|
|
}
|