Add ruby docs and run for fun

No need, just fun.

zig/sdl/hello_sdl.zig

const PythonHelpRunner = struct {
    fn init() Runner {
        return Runner{ .name = "python help", .run_always = true, .toArgv = toArgv, .isActive = isActive };
        return Runner{ .name = "python docs", .run_always = true, .toArgv = toArgv, .isActive = isActive };
    }
    fn isActive(cmd: []const u8) bool {
    }
};
const RubyHelpRunner = struct {
    fn init() Runner {
        return Runner{ .name = "ruby docs", .run_always = true, .toArgv = toArgv, .isActive = isActive };
    }
    fn isActive(cmd: []const u8) bool {
        return cmd.len > 3 and std.mem.startsWith(u8, cmd, "rb ");
    }
    fn toArgv(cmd: []const u8) []const []const u8 {
        _ = std.fmt.bufPrint(&cmd_buf, "{s}\x00", .{cmd["rb ".len..]}) catch "???";
        return &[_][]const u8{ "ri", &cmd_buf };
    }
};
const RubyRunner = struct {
    fn init() Runner {
        return Runner{ .name = "ruby run", .run_always = true, .toArgv = toArgv, .isActive = isActive };
    }
    fn isActive(cmd: []const u8) bool {
        return cmd.len > 3 and std.mem.startsWith(u8, cmd, "rb! ");
    }
    fn toArgv(cmd: []const u8) []const []const u8 {
        _ = std.fmt.bufPrint(&cmd_buf, "puts({s})\x00", .{cmd["rb! ".len..]}) catch "???";
        return &[_][]const u8{ "ruby", "-e", &cmd_buf };
    }
};
const HelpRunner = struct {
    fn init() Runner {
        return Runner{ .name = "--help", .run_always = true, .toArgv = toArgv, .isActive = isActive };
        GoDocRunner.init(),
        PythonHelpRunner.init(),
        PythonRunner.init(),
        RubyHelpRunner.init(),
        RubyRunner.init(),
        HelpRunner.init(),
        ManPageRunner.init(),
        SearchRunner.init(),