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{ pkgs, from-elisp }: {
org-tangle = block-predicate: text:
let blocks = (pkgs.callPackage from-elisp { inherit pkgs; }).parseOrgModeBabel text;
block-to-str = (block:
if block-predicate { inherit (block) language flags; } then
block.body
else
""
);
in builtins.concatStringsSep "\n" (map block-to-str blocks);
}
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