nixpkgs/pkgs/lib/modules.nix
Eelco Dolstra 80cab44fce * Options / config: these should be attrsets, not lists (IMHO).
svn path=/nixpkgs/trunk/; revision=16359
2009-07-14 16:22:42 +00:00

71 lines
1.7 KiB
Nix

# NixOS module handling.
let lib = import ./default.nix; in
with { inherit (builtins) head tail; };
with import ./trivial.nix;
with import ./lists.nix;
with import ./misc.nix;
with import ./attrsets.nix;
with import ./properties.nix;
rec {
# Unfortunately this can also be a string.
isPath = x: !(
builtins.isFunction x
|| builtins.isAttrs x
|| builtins.isInt x
|| builtins.isBool x
|| builtins.isList x
);
importIfPath = path:
if isPath path then
import path
else
path;
applyIfFunction = f: arg:
if builtins.isFunction f then
f arg
else
f;
moduleClosure = initModules: args:
let
moduleImport = m:
(applyIfFunction (importIfPath m) args) // {
# used by generic closure to avoid duplicated imports.
key = m;
};
removeKeys = list: map (m: removeAttrs m ["key"]) list;
getImports = m:
if m ? config || m ? options then
attrByPath ["imports"] [] m
else
toList (rmProperties (attrByPath ["require"] [] (delayProperties m)));
getImportedPaths = m: filter isPath (getImports m);
getImportedSets = m: filter (x: !isPath x) (getImports m);
inlineImportedSets = list:
lib.concatMap (m:[m] ++ map moduleImport (getImportedSets m)) list;
in
removeKeys (inlineImportedSets (lazyGenericClosure {
startSet = map moduleImport initModules;
operator = m: map moduleImport (getImportedPaths m);
}));
selectDeclsAndDefs = modules:
lib.concatMap (m:
if m ? config || m ? options then
[ (attrByPath ["options"] {} m) ]
++ [ (attrByPath ["config"] {} m) ]
else
[ m ]
) modules;
}