nimbus-eth2/nix/tools.nix

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Nix
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{ pkgs ? import <nixpkgs> { } }:
let
inherit (pkgs.lib) fileContents last splitString flatten remove;
inherit (builtins) map match;
in {
findKeyValue = regex: sourceFile:
let
linesFrom = file: splitString "\n" (fileContents file);
matching = regex: lines: map (line: match regex line) lines;
extractMatch = matches: last (flatten (remove null matches));
in
extractMatch (matching regex (linesFrom sourceFile));
}