Hi all, Currently there are many places in the Nixpkgs and NixOS expressions where we have to select a possibly missing attribute from a set, e.g.
attrByPath ["extraModules"] [] mainCfg or getConfig ["python" "db4Support"] true Writing `attrByPath ["a" "b" "c"] default as' is rather verbose and ugly compared to selecting an attribute without a default, i.e. `as.a.b.c'. Since this is fairly common, how about some special syntax for supplying a default value to the "." selection operator? I propose the optional "or" keyword following an attribute selection "x.<attrpath>". E.g. mainCfg.extraModules or [] or config.python.db4Support or true Comments? -- Eelco Dolstra | http://www.st.ewi.tudelft.nl/~dolstra/ _______________________________________________ nix-dev mailing list nix-dev@cs.uu.nl https://mail.cs.uu.nl/mailman/listinfo/nix-dev
