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NixOS Module System

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27 Mar 2024
@hexa:lossy.networkhexathat was always going to be the case23:30:32
@hexa:lossy.networkhexabut defaultText makes the condition discoverable23:30:39
@hexa:lossy.networkhexaas opposed to hiding it in the implementation23:30:47
@infinidoge:matrix.org@infinidoge:matrix.orgMy example was just how the default part could be done, wasn't a self-contained example23:31:58
@hexa:lossy.networkhexaI understood config as the implementation section of the module23:32:55
@infinidoge:matrix.org@infinidoge:matrix.orgIt's... weird, unfortunately. Options are mostly the interface, but with defaults they are somewhat load bearing23:34:02
@infinidoge:matrix.org@infinidoge:matrix.org All default does is assign a value with a priority, the end result here is the same 23:34:15
@infinidoge:matrix.org@infinidoge:matrix.orgThe benefit of it being part of the option is that it can be evaluated without the rest of it for the purpose of documentation and inspection, but in the end it's a modifiable part of the code nonetheless23:34:52
@infinidoge:matrix.org@infinidoge:matrix.orgThe main issue with doing it the config way is just that it makes that part of it grouped further away, which isn't particularly good23:36:20
@infinidoge:matrix.org@infinidoge:matrix.orgIt is useful to know if you want to add defaults to other modules though :)23:36:32
@hexa:lossy.networkhexaagreed23:36:33
@infinidoge:matrix.org@infinidoge:matrix.org
In reply to @hexa:lossy.network
  bla = mkOption {
    defaultText = ''
      Something if cond, else unset
    '';
  } // lib.optionalAttrs (cond) {
    default = "bar";
  };
Just in case you hadn't tested it yet, this does work by the way
23:38:04
@hexa:lossy.networkhexaI was about to23:38:48
@infinidoge:matrix.org@infinidoge:matrix.orgI need to figure out a better way to test module stuff than shoving it in my NixOS configuration and opening the flake repl23:39:48
28 Mar 2024
@adam:robins.wtf@adam:robins.wtfbuild a nixosTest?13:46:45
@infinidoge:matrix.org@infinidoge:matrix.orgThis is more about the module system itself as opposed to NixOS, so a NixOS test would be a bit overkill15:56:53
@adam:robins.wtf@adam:robins.wtfwell if you write a nixosTest, then you can load it into the repl within nixpkgs without having to use your flake17:01:43
@adam:robins.wtf@adam:robins.wtfsaves time of updating the flake input and copying a bunch to the store17:02:30
@adam:robins.wtf@adam:robins.wtf(or use existing test while developing)17:06:31
29 Mar 2024
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31 Mar 2024
@chadac:matrix.orgchadacIs there anything that influenced the design of the module system? After playing around with modules for a while I'm amazed I haven't been using something like this earlier, it seems so natural for designing templates.03:56:07
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16 Apr 2024
@lorenzleutgeb:matrix.orgLorenz Leutgeb joined the room.19:34:05
@lorenzleutgeb:matrix.orgLorenz Leutgeb

Hey! I have a question regarding the module system and/or generation of docs: How do I generate docs for a particular set of modules, i.e. all options defined in the modules from myservice.nix and myprogram.nix, only? Using baseModules = [] won't work, because my modules use options from NixOS. If that's not possible I run pkgs.nixosOptionsDoc for all modules and filter afterwards. Then the question arises how do I get a list of option names defined in a given module? Is that possible? As a last resort I would have to manually couple each module with some filtering expression.

infinisil pointed me at this comment, which helps, but still requires some external source of option names, e.g. I would have to know services.maubot, and cannot start from maubot.nix, for which I don't care which option names it defines.

19:35:27

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