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{warn}:
# Adapted from this: https://github.com/NixOS/nixpkgs/blob/1814b56453c91192f6d5a6276079948f9fe96c18/pkgs/top-level/by-name-overlay.nix
# This file should not depend on `pkgs` and thus not use `lib`.
{
baseDirectory,
fileName,
finalizeFunction,
}: let
# Takes a list of attrs as input and returns one merged attr set.
flattenAttrs = list:
if builtins.isList list
then
builtins.foldl' (acc: elem:
if builtins.isList elem
# Merging them with `//` is okay here, as we can be sure that the attr names are
# unique (they were separate dictionary after all)
then acc // (flattenAttrs elem)
else acc // elem) {}
list
else list;
# From nixpkgs/lib {{{
# These functions are taken straight out of the `nixpkgs/lib`.
# We can't depended on `pkgs` (and thus on `lib`), because the `pkgs` module argument
# is only defined in the `nixpkgs` module (which is imported through this function).
mapAttrsToList = f: attrs:
builtins.map (name: f name attrs.${name}) (builtins.attrNames attrs);
nameValuePair = name: value: {inherit name value;};
filterAttrs = pred: set:
builtins.listToAttrs (builtins.concatMap (name: let
v = set.${name};
in
if pred name v
then [(nameValuePair name v)]
else []) (builtins.attrNames set));
# }}}
# Module files for a single shard
# Type: String -> String -> ListOf Path
namesForShard = shard: type:
if type != "directory"
then warn "Ignored non-directory, whilst importing by-name directory (${fileName}): '${shard}'" {}
else let
mkPath = name: _type: let
path = baseDirectory + "/${shard}/${name}" + "/${fileName}";
in
if builtins.pathExists path
then path
else warn "'${builtins.toString path}' does not exist. Skipped" null;
in
filterAttrs (name: value: value != null)
(builtins.mapAttrs
mkPath
(builtins.readDir (baseDirectory + "/${shard}")));
# A list of all module paths.
# These can the be simply injected into `import`
files = flattenAttrs (mapAttrsToList namesForShard (builtins.readDir baseDirectory));
output =
builtins.mapAttrs
finalizeFunction
files;
in
output
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