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{ stdenv, fetchurl, imagemagick, lib }:
let
fetchWallpaper = lib.makeOverridable (
{ name, url, sha256, resolution ? "1920x1080", offset ? "0x0" }:
stdenv.mkDerivation {
inherit name;
src = fetchurl {
inherit url sha256;
};
buildInputs = [ imagemagick ];
phases = [ "unpackPhase" ];
unpackPhase = ''
convert "$src" -resize "${resolution}^" \
-crop "${resolution}+${offset}" \
"$out"
'';
});
sources = lib.importJSON ./sources.json;
in {
fetcher = fetchWallpaper;
} // builtins.mapAttrs (_: fetchWallpaper) sources
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