const std = @import("std");

// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) void {
    // Standard target options allows the person running `zig build` to choose
    // what target to build for. Here we do not override the defaults, which
    // means any target is allowed, and the default is native. Other options
    // for restricting supported target set are available.
    const target = b.standardTargetOptions(.{});

    // Standard optimization options allow the person running `zig build` to select
    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
    // set a preferred release mode, allowing the user to decide how to optimize.
    const optimize = b.standardOptimizeOption(.{});

    _ = b.addModule("gdbstub", .{
        .source_file = .{ .path = "src/lib.zig" },
        .dependencies = &.{},
    });

    // Creates a step for unit testing. This only builds the test executable
    // but does not run it.
    const lib_tests = b.addTest(.{
        .root_source_file = .{ .path = "src/lib.zig" },
        .target = target,
        .optimize = optimize,
    });

    const run_lib_tests = b.addRunArtifact(lib_tests);

    // This creates a build step. It will be visible in the `zig build --help` menu,
    // and can be selected like this: `zig build test`
    // This will evaluate the `test` step rather than the default, which is "install".
    const test_step = b.step("test", "Run library tests");
    test_step.dependOn(&run_lib_tests.step);
}

pub fn module(b: *std.Build) *std.Build.Module {
    return b.createModule(.{
        .source_file = .{ .path = path("/src/lib.zig") },
        .dependencies = &.{},
    });
}

// https://github.com/MasterQ32/SDL.zig/blob/4d565b54227b862c1540719e0e21a36d649e87d5/build.zig#L114-L120
fn path(comptime suffix: []const u8) []const u8 {
    if (suffix[0] != '/') @compileError("relToPath requires an absolute path!");
    return comptime blk: {
        const root_dir = std.fs.path.dirname(@src().file) orelse ".";
        break :blk root_dir ++ suffix;
    };
}