# SPDX-FileCopyrightText: © 2026 Jeffrey C. Ollie <jeff@ocjtech.us>
# SPDX-License-Identifier: MIT

{
  lib,
  stdenv,
  callPackage,
  git,
  tzdata,
  zig_0_17,
}:
let
  # Generated from build.zig.zon by zon2nix; regenerate with
  #   nix develop -c zon2nix --17 --nix=build.zig.zon.nix build.zig.zon
  zigDeps = callPackage ./build.zig.zon.nix { };
in
stdenv.mkDerivation (finalAttrs: {
  pname = "zig-git";
  version = "0.1.0";

  # Named rather than filtered, so that editing something outside this list
  # -- the flake, the workflow, a scratch file -- does not rebuild the package.
  src = lib.fileset.toSource {
    root = ./.;
    fileset = lib.fileset.unions [
      ./build.zig
      ./build.zig.zon
      ./src
      ./tools
      ./LICENSES
      ./REUSE.toml
    ];
  };

  nativeBuildInputs = [ zig_0_17.hook ];

  # --system forbids fetching: every dependency comes from zigDeps.
  zigBuildFlags = [
    "--system"
    "${zigDeps}"
  ];
  # The check phase assembles its own flags rather than reusing the
  # build's, so without this `zig build test` tries to fetch and fails in
  # the sandbox.
  zigCheckFlags = finalAttrs.zigBuildFlags;

  # The tests make their repositories with git and compare answers with it.
  nativeCheckInputs = [ git ];
  doCheck = true;
  # The time zones the tests that compare dates read local time with.
  preCheck = ''
    export TZDIR=${tzdata}/share/zoneinfo
  '';

  # The install phase installs zig-git, the tool for comparing the library
  # with git; the library itself has nothing to install but its
  # documentation.
  postInstall = ''
    zig build docs --system ${zigDeps} --prefix $out
  '';

  meta = {
    description = "Reading and writing git repositories in Zig, without running git";
    homepage = "https://git.jcollie.dev/jeff/zig-git";
    license = lib.licenses.mit;
    platforms = lib.platforms.unix;
  };
})