flake-utils/default.nix

59 lines
1.2 KiB
Nix

let
# copied from <nixpkgs/lib>
genAttrs = names: f:
builtins.listToAttrs (map (n: { name = n; value = f n; }) names);
mapAttrsToList = f: attrs:
map (name: f name attrs.${name}) (builtins.attrNames attrs);
# The list of systems supported by nixpkgs and hydra
defaultSystems = [
"aarch64-linux"
"i686-linux"
"x86_64-darwin"
"x86_64-linux"
];
# eachSystem using defaultSystems
eachDefaultSystem = eachSystem defaultSystems;
# Builds a map from <attr>=value to <system>.<attr>=value for each system.
#
#
eachSystem = systems: f:
let
op = attrs: system:
let
ret = f system;
opt = attrs: key:
attrs //
{
${key} = (attrs.${key} or {}) // { ${system} = ret.${key}; };
}
;
in
builtins.foldl' op attrs (builtins.attrNames ret);
in
builtins.foldl' op {} systems
;
# Returns the structure used by `nix app`
mkApp =
{ drv
, name ? drv.pname or drv.name
, exePath ? drv.passthru.exePath or "/bin/${name}"
}:
{
type = "app";
program = "${drv}${exePath}";
};
in
{
inherit
defaultSystems
eachDefaultSystem
eachSystem
mkApp
;
}