A custom build.zig command to run system commands and see their output

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So I have been iterating on this and I hit a new snag.

This is the current code

// in `fn build`
    { // `zig build eye` command
        const eye_step = b.step("eye", "Eye test all the files in a given directory");

        if (b.option(std.Build.LazyPath, "folder", "Path to eye")) |lazy|
            try walk_tree(b, exe, eye_step, lazy)
        else
            eye_step.dependOn(&b.addFail("folder needed for eye").step);
    }


// later
fn walk_tree(
    b: *std.Build,
    exe: *std.Build.Step.Compile,
    eye_step: *std.Build.Step,
    lazy: std.Build.LazyPath,
) !void {
    const path = lazy.getPath3(b, null);
    const dir = try path.openDir("", .{ .iterate = true });
    var walker = dir.iterate();

    // const fail = b.option(bool, "fail", "failing tests") orelse false;

    var prev_run_cmd: ?*std.Build.Step.Run = null;
    while (try walker.next()) |entry| if (entry.kind == .file and
        std.mem.endsWith(u8, entry.name, ".c"))
    {
        const file = entry.name;

        const bat = b.addSystemCommand(&.{ "bat", file });
        bat.addArg("--paging=never");
        bat.setCwd(lazy);
        bat.stdio = .inherit;

        if (prev_run_cmd) |c|
            bat.step.dependOn(&c.step);

        const run_cmd = b.addRunArtifact(exe);
        // if (fail) run_cmd.expectExitCode(1);
        run_cmd.setCwd(lazy);
        run_cmd.addArg(file);
        run_cmd.addArgs(b.args orelse &.{});
        run_cmd.stdio = .inherit;

        run_cmd.step.dependOn(b.getInstallStep());
        run_cmd.step.dependOn(&bat.step);

        prev_run_cmd = run_cmd;
    };

    eye_step.dependOn(&prev_run_cmd.?.step);
}

Everything here works as intended. However , I am trying to add support for running this over tests that fail, i.e. my executable returns 1, and for whatever reason even with the two fail lines (that are committed out here), it still fails on the first 1 result. I even tried putting the fail option outside and passing it into the function but to no use.

Full file is in here in this branch paella/build.zig at build-system-iter · asibahi/paella · GitHub

I am running it like so

zig build eye -Dfail -Dfolder=../writing-a-c-compiler-tests/tests/chapter_9/invalid_types -- --validate