build.zig

pub fn build(b: *Build) void {
    const target: ResolvedTarget = b.standardTargetOptions(.{});
    const optimize: OptimizeMode = b.standardOptimizeOption(.{});

    const mod: *Module = b.addModule("seq_zig", .{
        .root_source_file = b.path("src/root.zig"),
        .target = target,
        .optimize = optimize,
    });

    const exe: *Compile = b.addExecutable(.{
        .name = "seq_zig",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/main.zig"),
            .target = target,
            .optimize = optimize,
            .error_tracing = true,
            .imports = &.{
                .{ .name = "seq_zig", .module = mod },
            },
        }),
    });

    // This declares intent for the executable to be installed into the
    // install prefix when running `zig build` (i.e. when executing the default
    // step). By default the install prefix is `zig-out/` but can be overridden
    // by passing `--prefix` or `-p`.
    b.installArtifact(exe);

    // This creates a top level step. Top level steps have a name and can be
    // invoked by name when running `zig build` (e.g. `zig build run`).
    // This will evaluate the `run` step rather than the default step.
    // For a top level step to actually do something, it must depend on other
    // steps (e.g. a Run step, as we will see in a moment).
    const run_step: *Step = b.step("run", "Run the app");

    // This creates a RunArtifact step in the build graph. A RunArtifact step
    // invokes an executable compiled by Zig. Steps will only be executed by the
    // runner if invoked directly by the user (in the case of top level steps)
    // or if another step depends on it, so it's up to you to define when and
    // how this Run step will be executed. In our case we want to run it when
    // the user runs `zig build run`, so we create a dependency link.
    const run_cmd: *Run = b.addRunArtifact(exe);
    run_step.dependOn(&run_cmd.step);

    // By making the run step depend on the default step, it will be run from the
    // installation directory rather than directly from within the cache directory.
    run_cmd.step.dependOn(b.getInstallStep());

    // This allows the user to pass arguments to the application in the build
    // command itself, like this: `zig build run -- arg1 arg2 etc`
    if (b.args) |args| {
        run_cmd.addArgs(args);
    }

    // Creates an executable that will run `test` blocks from the provided module.
    // Here `mod` needs to define a target, which is why earlier we made sure to
    // set the releative field.
    const mod_tests: *Compile = b.addTest(.{
        .root_module = mod,
    });

    // A run step that will run the test executable.
    const run_mod_tests: *Run = b.addRunArtifact(mod_tests);

    // Creates an executable that will run `test` blocks from the executable's
    // root module. Note that test executables only test one module at a time,
    // hence why we have to create two separate ones.
    const exe_tests: *Compile = b.addTest(.{
        .root_module = exe.root_module,
    });

    // A run step that will run the second test executable.
    const run_exe_tests: *Run = b.addRunArtifact(exe_tests);

    // A top level step for running all tests. dependOn can be called multiple
    // times and since the two run steps do not depend on one another, this will
    // make the two of them run in parallel.
    const test_step: *Step = b.step("test", "Run tests");
    test_step.dependOn(&run_mod_tests.step);
    test_step.dependOn(&run_exe_tests.step);

    // Just like flags, top level steps are also listed in the `--help` menu.
    //
    // The Zig build system is entirely implemented in userland, which means
    // that it cannot hook into private compiler APIs. All compilation work
    // orchestrated by the build system will result in other Zig compiler
    // subcommands being invoked with the right flags defined. You can observe
    // these invocations when one fails (or you pass a flag to increase
    // verbosity) to validate assumptions and diagnose problems.
    //
    // Lastly, the Zig build system is relatively simple and self-contained,
    // and reading its source code will allow you to master it.
}

const std = @import("std");
const Build = std.Build;
const OptimizeMode = std.builtin.OptimizeMode;
const ResolvedTarget = std.Build.ResolvedTarget;
const Module = std.Build.Module;
const Step = std.Build.Step;
const Compile = Step.Compile;
const Run = Step.Run;