Eva

A backbone standard library for the VienDesu! projects. Carefully crafted functionality.

We emphasize:

• Correctness - the code inside is carefully crafted to ensure that it would be used in a correct way
• Performance - no perf trade-offs where possible
• Precise types - eva contains and allows you to define types more precisely, this ensures correctness statically and reveals more use-cases to the user and provides more information to the compiler

This library may re-export other crates selectively or entirely, but I strive to do that as rarely as possible.

Flake library

The flake exports lib with shared Nix machinery for eva services: a pinned Rust toolchain, crane-based package builds (git dependencies come straight from Cargo.lock, no outputHashes), a dev shell, and a generated NixOS module (services.<pname> with settings/extraConfigFiles/user/group/ environment). A typical service flake is just:

{
  inputs.eva.url = "git+https://git.desu.church/VienDesu/eva.git";

  outputs = { self, eva, ... }: eva.lib.mkServiceFlake {
    inherit self;
    pname = "my-service";
    mainProgram = "my-service-server"; # default: pname
    description = "my-service, does things";
    settingsDefaults = { http.listen = "127.0.0.1:8080"; };
  };
}

Knobs: version, env (extra build env, e.g. an embedded commit hash), srcFilter (extra non-cargo sources), format ("yaml" default, "toml"), extraServiceConfig (merged into the systemd unit), devShell (pkgs: { stdenv, extraPackages, env }). The pieces (mkPkgs, rustToolchain, mkPackage, mkDevShell, mkModule) are exported separately for nonstandard flakes.