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doc: add explanatory code comment

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Valentin Gagarin 2023-11-13 20:59:15 +01:00 committed by fricklerhandwerk
parent 2bbf67d3c7
commit 0530d6bd04
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4
pkgs/build-support/mkshell/default.nix
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@ -16,6 +16,10 @@
let
mergeInputs = name:
(attrs.${name} or [ ]) ++
# 1. get all `{build,nativeBuild,...}Inputs` from the elements of `inputsFrom`
# 2. since that is a list of lists, `flatten` that into a regular list
# 3. filter out of the result everything that's in `inputsFrom` itself
# this leaves actual dependencies of the derivations in `inputsFrom`, but never the derivations themselves
(lib.subtractLists inputsFrom (lib.flatten (lib.catAttrs name inputsFrom)));
rest = builtins.removeAttrs attrs [