Display available commands on startup

zig/sdl/hello_sdl.zig

    }
};
const SelfDocRunner = struct {
    fn init() Runner {
        return Runner{ .name = "usage", .run_always = true, .toArgv = toArgv, .isActive = isActive };
    }
    fn isActive(cmd: []const u8) bool {
        return cmd.len == 0;
    }
    fn toArgv(_: []const u8) []const []const u8 {
        const print_help =
            "cat <<EOF\n" ++
            "\x1b[37mqck - type something, find something (quick)!\x1b[0m\n" ++
            "\n" ++
            "\x1b[37mcommands:\x1b[0m\n" ++
            "\n" ++
            "  s\x1b[37m <search>       -- search for <search> in SEARCH_DIRS\x1b[0m\n" ++
            "  file \x1b[37m<name>      -- search for file matching <name> and preview it\x1b[0m\n" ++
            "\n" ++
            "  man\x1b[37m <name>       -- display man page for <name>\x1b[0m\n" ++
            "  \x1b[37mcommand\x1b[0m --help \x1b[37m  -- display --help output for <command>\x1b[0m\n" ++
            "  go\x1b[37m <name>        -- display go doc for <name>\x1b[0m\n" ++
            "  py\x1b[37m <name>        -- display python doc for <name>\x1b[0m\n" ++
            "  py!\x1b[37m\x1b[0m\n" ++
            "  rb\x1b[37m <name>        -- display ruby doc for <name>\x1b[0m\n" ++
            "  rb!\x1b[37m\x1b[0m\n" ++
            "\n" ++
            "  <math expr>\x1b[37m      -- run <math expr> using qalc\x1b[0m\n" ++
            "\n" ++
            "  logs\x1b[37m [<service>] -- display logs of <service> or all logs by default\x1b[0m\n" ++
            "EOF\n";
        return &[_][]const u8{ "bash", "-c", print_help };
    }
};
pub fn main() !void {
    var general_purpose_allocator = std.heap.GeneralPurposeAllocator(.{}){};
    defer {
        FileRunner.init(),
        LogsRunner.init(),
        QalcRunner.init(),
        SelfDocRunner.init(),
    };
    var quit = false;
    var num_lines: i32 = 0;
    var output_length: usize = 0;
    var changed = false;
    var changed = true; // initially true to print help even with no command
    var hasChanged = false;
    var lastChange: u32 = 0;
                    var part_text = part.?;
                    if (std.mem.startsWith(u8, part_text, "0m")) {
                        part_text = part_text[2..];
                    } else if (std.mem.startsWith(u8, part_text, "37m")) {
                        part_text = part_text[3..];
                        fg_color = c.SDL_Color{ .r = 200, .g = 200, .b = 200, .a = 255 };
                    } else if (std.mem.startsWith(u8, part_text, "1;32m")) {
                        fnt = bold_font;
                        part_text = part_text[5..];