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{ lib, super }:
from: to:
# Example from / to
# - Lifting `options` from: _api, to: options
#
# Note:
# underscore used as mere convention to signalling to the user the "private"
# nature, they won't be part of the final view presented to the user
let
inherit (lib)
recursiveUpdate
;
inherit (super.utils)
concatMapAttrsWith
;
in
cursor:
let toplevel = cursor == [ ]; in
concatMapAttrsWith recursiveUpdate
(file: value: if ! value ? ${from} then { ${file} = value; } else {
${file} = removeAttrs value [ from ];
# top level ${from} declarations are omitted from merging
${if toplevel then to else from} = { ${file} = value.${from}; };
})