nixpkgs/lib/fileset/mock-splitRoot.nix

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2023-08-16 22:55:32 +00:00
# This overlay implements mocking of the lib.path.splitRoot function
# It pretends that the last component named "mock-root" is the root:
#
# splitRoot /foo/mock-root/bar/mock-root/baz
# => {
# root = /foo/mock-root/bar/mock-root;
# subpath = "./baz";
# }
self: super: {
path = super.path // {
splitRoot = path:
let
parts = super.path.splitRoot path;
components = self.path.subpath.components parts.subpath;
count = self.length components;
rootIndex = count - self.lists.findFirstIndex
(component: component == "mock-root")
(self.length components)
(self.reverseList components);
root = self.path.append parts.root (self.path.subpath.join (self.take rootIndex components));
subpath = self.path.subpath.join (self.drop rootIndex components);
in {
inherit root subpath;
};
};
}