#include "window.hh"
#include "buffer.hh"
#include "shell_manager.hh"
#include "commands.hh"
#include "command_manager.hh"
#include "buffer_manager.hh"
#include "register_manager.hh"
#include "selectors.hh"
#include "assert.hh"
#include "debug.hh"
#include "highlighters.hh"
#include "highlighter_registry.hh"
#include "filters.hh"
#include "filter_registry.hh"
#include "hook_manager.hh"
#include "option_manager.hh"
#include "event_manager.hh"
#include "context.hh"
#include "ncurses.hh"
#include "string.hh"
#include "file.hh"
#include "color_registry.hh"
#include "remote.hh"

#if defined(__APPLE__)
#include <mach-o/dyld.h>
#endif

#include <unordered_map>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>

using namespace Kakoune;
using namespace std::placeholders;

namespace Kakoune
{

bool quit_requested = false;

template<InsertMode mode>
void do_insert(Context& context)
{
    context.input_handler().insert(context, mode);
}

void do_repeat_insert(Context& context)
{
    context.input_handler().repeat_last_insert(context);
}

template<SelectMode mode>
void do_go(Context& context)
{
    int count = context.numeric_param();
    if (count != 0)
    {
        BufferIterator target =
            context.editor().buffer().iterator_at_line_begin(count-1);

        context.editor().select(target);
        if (context.has_window())
            context.window().center_selection();
    }
    else
        context.input_handler().on_next_key([](const Key& key, Context& context) {
            if (key.modifiers != Key::Modifiers::None)
                return;

            Editor& editor = context.editor();
            switch (key.key)
            {
            case 'g':
            case 't':
                editor.select(editor.buffer().begin());
                break;
            case 'l':
            case 'L':
                editor.select(select_to_eol, mode);
                break;
            case 'h':
            case 'H':
                editor.select(select_to_eol_reverse, mode);
                break;
            case 'b':
            {
                const Buffer& buf = editor.buffer();
                editor.select(buf.iterator_at_line_begin(buf.line_count() - 1));
                break;
            }
            }
        });
}

void do_replace_with_char(Context& context)
{
    context.input_handler().on_next_key([](const Key& key, Context& context) {
        context.editor().insert(String() + key.key, InsertMode::Replace);
    });
}

void do_command(Context& context)
{
    context.input_handler().prompt(
        ":", std::bind(&CommandManager::complete, &CommandManager::instance(), _1, _2, _3),
        [](const String& cmdline, Context& context) { CommandManager::instance().execute(cmdline, context); },
        context);
}

void do_pipe(Context& context)
{
    context.input_handler().prompt("|", complete_nothing,
        [](const String& cmdline, Context& context)
        {
            Editor& editor = context.editor();
            std::vector<String> strings;
            for (auto& sel : const_cast<const Editor&>(context.editor()).selections())
                strings.push_back(ShellManager::instance().pipe(String(sel.begin(), sel.end()),
                                                                cmdline, context, {}, {}));
            editor.insert(strings, InsertMode::Replace);
        }, context);

}

template<SelectMode mode>
void do_search(Context& context)
{
    context.input_handler().prompt("/", complete_nothing,
        [](const String& str, Context& context) {
            String ex = str;
            if (ex.empty())
                ex = RegisterManager::instance()['/'].values(context)[0];
            else
                RegisterManager::instance()['/'] = ex;

            context.editor().select(std::bind(select_next_match, _1, ex), mode);
        }, context);
}

template<SelectMode mode>
void do_search_next(Context& context)
{
    const String& ex = RegisterManager::instance()['/'].values(context)[0];
    if (not ex.empty())
        context.editor().select(std::bind(select_next_match, _1, ex), mode);
    else
        context.print_status("no search pattern");
}

void do_yank(Context& context)
{
    RegisterManager::instance()['"'] = context.editor().selections_content();
}

void do_erase(Context& context)
{
    RegisterManager::instance()['"'] = context.editor().selections_content();
    context.editor().erase();
}

void do_change(Context& context)
{
    RegisterManager::instance()['"'] = context.editor().selections_content();
    do_insert<InsertMode::Replace>(context);
}

static InsertMode adapt_for_linewise(InsertMode mode)
{
    if (mode == InsertMode::Append)
        return InsertMode::AppendAtLineEnd;
    if (mode == InsertMode::Insert)
        return InsertMode::InsertAtLineBegin;

    assert(false);
    return InsertMode::Insert;
}

template<InsertMode insert_mode>
void do_paste(Context& context)
{
    Editor& editor = context.editor();
    int count = context.numeric_param();
    auto strings = RegisterManager::instance()['"'].values(context);
    InsertMode mode = insert_mode;
    if (count == 0)
    {
        for (auto& str : strings)
        {
            if (not str.empty() and str.back() == '\n')
            {
                mode = adapt_for_linewise(mode);
                break;
            }
        }
        editor.insert(strings, mode);
    }
    else if (count <= strings.size())
    {
        auto& str = strings[count-1];
        if (not str.empty() and str.back() == '\n')
            mode = adapt_for_linewise(mode);
        editor.insert(str, mode);
    }
}

void do_select_regex(Context& context)
{
    context.input_handler().prompt("select: ", complete_nothing,
        [](const String& ex, Context& context)
        { context.editor().multi_select(std::bind(select_all_matches, _1, ex)); },
        context);
}

void do_split_regex(Context& context)
{
    context.input_handler().prompt("select: ", complete_nothing,
        [](const String& ex, Context& context)
        { context.editor().multi_select(std::bind(split_selection, _1, ex)); },
        context);
}

void do_join(Context& context)
{
    Editor& editor = context.editor();
    editor.select(select_whole_lines);
    editor.select(select_to_eol, SelectMode::Extend);
    editor.multi_select(std::bind(select_all_matches, _1, "\n\\h*"));
    editor.insert(" ", InsertMode::Replace);
    editor.clear_selections();
    editor.move_selections(-1_char);
}

template<bool inner>
void do_select_object(Context& context)
{
    context.input_handler().on_next_key(
    [](const Key& key, Context& context) {
        typedef std::function<SelectionAndCaptures (const Selection&)> Selector;
        static const std::unordered_map<Key, Selector> key_to_selector =
        {
            { { Key::Modifiers::None, '(' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '(', ')' }, inner) },
            { { Key::Modifiers::None, ')' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '(', ')' }, inner) },
            { { Key::Modifiers::None, 'b' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '(', ')' }, inner) },
            { { Key::Modifiers::None, '{' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '{', '}' }, inner) },
            { { Key::Modifiers::None, '}' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '{', '}' }, inner) },
            { { Key::Modifiers::None, 'B' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '{', '}' }, inner) },
            { { Key::Modifiers::None, '[' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '[', ']' }, inner) },
            { { Key::Modifiers::None, ']' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '[', ']' }, inner) },
            { { Key::Modifiers::None, '<' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '<', '>' }, inner) },
            { { Key::Modifiers::None, '>' }, std::bind(select_surrounding, _1, std::pair<char, char>{ '<', '>' }, inner) },
            { { Key::Modifiers::None, 'w' }, std::bind(select_whole_word<false>, _1, inner) },
            { { Key::Modifiers::None, 'W' }, std::bind(select_whole_word<true>, _1, inner) },
        };

        auto it = key_to_selector.find(key);
        if (it != key_to_selector.end())
            context.editor().select(it->second);
    });
}

template<Key::NamedKey key>
void do_scroll(Context& context)
{
    static_assert(key == Key::PageUp or key == Key::PageDown,
                  "do_scrool only implements PageUp and PageDown");
    Window& window = context.window();
    Buffer& buffer = context.buffer();
    DisplayCoord position = window.position();
    LineCount cursor_line = 0;

    if (key == Key::PageUp)
    {
        position.line -= (window.dimensions().line - 2);
        cursor_line = position.line;
    }
    else if (key == Key::PageDown)
    {
        position.line += (window.dimensions().line - 2);
        cursor_line = position.line + window.dimensions().line - 1;
    }
    auto cursor_pos = utf8::advance(buffer.iterator_at_line_begin(position.line),
                                    buffer.iterator_at_line_end(position.line),
                                    position.column);
    window.select(cursor_pos);
    window.set_position(position);
}

template<typename T>
class Repeated
{
public:
    Repeated(T t) : m_func(t) {}

    void operator() (Context& context)
    {
        int count = context.numeric_param();
        do { m_func(context); } while(--count > 0);
    }
private:
    T m_func;
};

template<typename T>
Repeated<T> repeated(T func) { return Repeated<T>(func); }

namespace SelectFlags
{
    enum Type
    {
        None = 0,
        Reverse = 1,
        Inclusive = 2,
        Extend = 4
    };
}

template<int flags>
void select_to_next_char(Context& context)
{
    int param = context.numeric_param();
    context.input_handler().on_next_key([param](const Key& key, Context& context) {
        context.editor().select(
            std::bind(flags & SelectFlags::Reverse ? select_to_reverse : select_to,
                      _1, key.key, param, flags & SelectFlags::Inclusive),
            flags & SelectFlags::Extend ? SelectMode::Extend : SelectMode::Replace);
   });
}

String runtime_directory()
{
    char buffer[2048];
#if defined(__linux__)
    ssize_t res = readlink("/proc/self/exe", buffer, 2048);
    assert(res != -1);
    buffer[res] = '\0';
#elif defined(__APPLE__)
    uint32_t bufsize = 2048;
    _NSGetExecutablePath(buffer, &bufsize);
    char* canonical_path = realpath(buffer, NULL);
    strncpy(buffer, canonical_path, 2048);
    free(canonical_path);
#else
# error "finding executable path is not implemented on this platform"
#endif
    char* ptr = strrchr(buffer, '/');
    if (not ptr)
        throw runtime_error("unable do determine runtime directory");
    return String(buffer, ptr);
}

std::unordered_map<Key, std::function<void (Context& context)>> keymap =
{
    { { Key::Modifiers::None, 'h' }, [](Context& context) { context.editor().move_selections(-CharCount(std::max(context.numeric_param(),1))); } },
    { { Key::Modifiers::None, 'j' }, [](Context& context) { context.editor().move_selections( LineCount(std::max(context.numeric_param(),1))); } },
    { { Key::Modifiers::None, 'k' }, [](Context& context) { context.editor().move_selections(-LineCount(std::max(context.numeric_param(),1))); } },
    { { Key::Modifiers::None, 'l' }, [](Context& context) { context.editor().move_selections( CharCount(std::max(context.numeric_param(),1))); } },

    { { Key::Modifiers::None, 'H' }, [](Context& context) { context.editor().move_selections(-CharCount(std::max(context.numeric_param(),1)), SelectMode::Extend); } },
    { { Key::Modifiers::None, 'J' }, [](Context& context) { context.editor().move_selections( LineCount(std::max(context.numeric_param(),1)), SelectMode::Extend); } },
    { { Key::Modifiers::None, 'K' }, [](Context& context) { context.editor().move_selections(-LineCount(std::max(context.numeric_param(),1)), SelectMode::Extend); } },
    { { Key::Modifiers::None, 'L' }, [](Context& context) { context.editor().move_selections( CharCount(std::max(context.numeric_param(),1)), SelectMode::Extend); } },

    { { Key::Modifiers::None, 't' }, select_to_next_char<SelectFlags::None> },
    { { Key::Modifiers::None, 'f' }, select_to_next_char<SelectFlags::Inclusive> },
    { { Key::Modifiers::None, 'T' }, select_to_next_char<SelectFlags::Extend> },
    { { Key::Modifiers::None, 'F' }, select_to_next_char<SelectFlags::Inclusive | SelectFlags::Extend> },
    { { Key::Modifiers::Alt,  't' }, select_to_next_char<SelectFlags::Reverse> },
    { { Key::Modifiers::Alt,  'f' }, select_to_next_char<SelectFlags::Inclusive | SelectFlags::Reverse> },
    { { Key::Modifiers::Alt,  'T' }, select_to_next_char<SelectFlags::Extend | SelectFlags::Reverse> },
    { { Key::Modifiers::Alt,  'F' }, select_to_next_char<SelectFlags::Inclusive | SelectFlags::Extend | SelectFlags::Reverse> },

    { { Key::Modifiers::None, 'd' }, do_erase },
    { { Key::Modifiers::None, 'c' }, do_change },
    { { Key::Modifiers::None, 'i' }, do_insert<InsertMode::Insert> },
    { { Key::Modifiers::None, 'I' }, do_insert<InsertMode::InsertAtLineBegin> },
    { { Key::Modifiers::None, 'a' }, do_insert<InsertMode::Append> },
    { { Key::Modifiers::None, 'A' }, do_insert<InsertMode::AppendAtLineEnd> },
    { { Key::Modifiers::None, 'o' }, do_insert<InsertMode::OpenLineBelow> },
    { { Key::Modifiers::None, 'O' }, do_insert<InsertMode::OpenLineAbove> },
    { { Key::Modifiers::None, 'r' }, do_replace_with_char },

    { { Key::Modifiers::None, 'g' }, do_go<SelectMode::Replace> },
    { { Key::Modifiers::None, 'G' }, do_go<SelectMode::Extend> },

    { { Key::Modifiers::None, 'y' }, do_yank },
    { { Key::Modifiers::None, 'p' }, do_paste<InsertMode::Append> },
    { { Key::Modifiers::None, 'P' }, do_paste<InsertMode::Insert> },
    { { Key::Modifiers::Alt,  'p' }, do_paste<InsertMode::Replace> },

    { { Key::Modifiers::None, 's' }, do_select_regex },

    { { Key::Modifiers::None, '.' }, do_repeat_insert },

    { { Key::Modifiers::None, '%' }, [](Context& context) { context.editor().clear_selections(); context.editor().select(select_whole_buffer); } },

    { { Key::Modifiers::None, ':' }, do_command },
    { { Key::Modifiers::None, '|' }, do_pipe },
    { { Key::Modifiers::None, ' ' }, [](Context& context) { int count = context.numeric_param();
                                                            if (count == 0) context.editor().clear_selections();
                                                            else context.editor().keep_selection(count-1); } },
    { { Key::Modifiers::Alt,  ' ' }, [](Context& context) { int count = context.numeric_param();
                                                            if (count == 0) context.editor().clear_selections();
                                                            else context.editor().remove_selection(count-1); } },
    { { Key::Modifiers::None, 'w' }, repeated([](Context& context) { context.editor().select(select_to_next_word<false>); }) },
    { { Key::Modifiers::None, 'e' }, repeated([](Context& context) { context.editor().select(select_to_next_word_end<false>); }) },
    { { Key::Modifiers::None, 'b' }, repeated([](Context& context) { context.editor().select(select_to_previous_word<false>); }) },
    { { Key::Modifiers::None, 'W' }, repeated([](Context& context) { context.editor().select(select_to_next_word<false>, SelectMode::Extend); }) },
    { { Key::Modifiers::None, 'E' }, repeated([](Context& context) { context.editor().select(select_to_next_word_end<false>, SelectMode::Extend); }) },
    { { Key::Modifiers::None, 'B' }, repeated([](Context& context) { context.editor().select(select_to_previous_word<false>, SelectMode::Extend); }) },
    { { Key::Modifiers::None, 'x' }, repeated([](Context& context) { context.editor().select(select_line, SelectMode::Replace); }) },
    { { Key::Modifiers::None, 'X' }, repeated([](Context& context) { context.editor().select(select_line, SelectMode::Extend); }) },
    { { Key::Modifiers::None, 'm' }, [](Context& context) { context.editor().select(select_matching); } },
    { { Key::Modifiers::None, 'M' }, [](Context& context) { context.editor().select(select_matching, SelectMode::Extend); } },

    { { Key::Modifiers::None, '/' }, do_search<SelectMode::Replace> },
    { { Key::Modifiers::None, '?' }, do_search<SelectMode::Extend> },
    { { Key::Modifiers::None, 'n' }, do_search_next<SelectMode::Replace> },
    { { Key::Modifiers::None, 'N' }, do_search_next<SelectMode::Append> },

    { { Key::Modifiers::None, 'u' }, repeated([](Context& context) { if (not context.editor().undo()) { context.print_status("nothing left to undo"); } }) },
    { { Key::Modifiers::None, 'U' }, repeated([](Context& context) { if (not context.editor().redo()) { context.print_status("nothing left to redo"); } }) },

    { { Key::Modifiers::Alt,  'i' }, do_select_object<true> },
    { { Key::Modifiers::Alt,  'a' }, do_select_object<false> },

    { { Key::Modifiers::Alt, 'w' }, repeated([](Context& context) { context.editor().select(select_to_next_word<true>); }) },
    { { Key::Modifiers::Alt, 'e' }, repeated([](Context& context) { context.editor().select(select_to_next_word_end<true>); }) },
    { { Key::Modifiers::Alt, 'b' }, repeated([](Context& context) { context.editor().select(select_to_previous_word<true>); }) },
    { { Key::Modifiers::Alt, 'W' }, repeated([](Context& context) { context.editor().select(select_to_next_word<true>, SelectMode::Extend); }) },
    { { Key::Modifiers::Alt, 'E' }, repeated([](Context& context) { context.editor().select(select_to_next_word_end<true>, SelectMode::Extend); }) },
    { { Key::Modifiers::Alt, 'B' }, repeated([](Context& context) { context.editor().select(select_to_previous_word<true>, SelectMode::Extend); }) },

    { { Key::Modifiers::Alt, 'l' }, repeated([](Context& context) { context.editor().select(select_to_eol, SelectMode::Replace); }) },
    { { Key::Modifiers::Alt, 'L' }, repeated([](Context& context) { context.editor().select(select_to_eol, SelectMode::Extend); }) },
    { { Key::Modifiers::Alt, 'h' }, repeated([](Context& context) { context.editor().select(select_to_eol_reverse, SelectMode::Replace); }) },
    { { Key::Modifiers::Alt, 'H' }, repeated([](Context& context) { context.editor().select(select_to_eol_reverse, SelectMode::Extend); }) },

    { { Key::Modifiers::Alt, 's' }, do_split_regex },

    { { Key::Modifiers::Alt, 'j' }, do_join },

    { { Key::Modifiers::Alt, 'x' }, [](Context& context) { context.editor().select(select_whole_lines); } },

    { { Key::Modifiers::Alt, 'c' }, [](Context& context) { if (context.has_window()) context.window().center_selection(); } },

    { { Key::Modifiers::None, Key::PageUp }, do_scroll<Key::PageUp> },
    { { Key::Modifiers::None, Key::PageDown }, do_scroll<Key::PageDown> },
};

}

void run_unit_tests();

void register_env_vars()
{
    ShellManager& shell_manager = ShellManager::instance();

    shell_manager.register_env_var("bufname",
                                   [](const String& name, const Context& context)
                                   { return context.buffer().name(); });
    shell_manager.register_env_var("selection",
                                   [](const String& name, const Context& context)
                                   { return context.editor().selections_content().back(); });
    shell_manager.register_env_var("runtime",
                                   [](const String& name, const Context& context)
                                   { return runtime_directory(); });
    shell_manager.register_env_var("opt_.+",
                                   [](const String& name, const Context& context)
                                   { return context.option_manager()[name.substr(4_byte)].as_string(); });
    shell_manager.register_env_var("reg_.+",
                                   [](const String& name, const Context& context)
                                   { return RegisterManager::instance()[name[4]].values(context)[0]; });
}

void register_registers()
{
    RegisterManager& register_manager = RegisterManager::instance();

    register_manager.register_dynamic_register('%', [](const Context& context) { return std::vector<String>(1, context.buffer().name()); });
    register_manager.register_dynamic_register('.', [](const Context& context) { return context.editor().selections_content(); });
    for (size_t i = 0; i < 10; ++i)
    {
         register_manager.register_dynamic_register('0'+i,
              [i](const Context& context) {
                  std::vector<String> result;
                  for (auto& sel_and_cap : context.editor().selections())
                      result.emplace_back(i < sel_and_cap.captures.size() ? sel_and_cap.captures[i] : "");
                  return result;
              });
    }
}

struct Client
{
    std::unique_ptr<UserInterface> ui;
    std::unique_ptr<InputHandler>  input_handler;
    std::unique_ptr<Context>       context;

    Client(UserInterface* ui, Window& window)
        : ui(ui),
          input_handler(new InputHandler{}),
          context(new Context(*input_handler, window, *ui)) {}

    Client() {}
};

Client create_local_client(const String& file)
{
    Buffer* buffer = nullptr;
    UserInterface* ui = new NCursesUI{};
    if (not file.empty())
    {
        buffer = create_buffer_from_file(file);
        if (not buffer)
        {
            ui->print_status("new file " + file, -1);
            buffer = new Buffer(file, Buffer::Type::NewFile);
        }
    }
    else
        buffer = new Buffer("*scratch*", Buffer::Type::Scratch);

    Client client{ui, *buffer->get_or_create_window()};

    InputHandler*  input_handler = client.input_handler.get();
    Context*       context = client.context.get();
    EventManager::instance().watch(0, [=](int) {
        try
        {
            input_handler->handle_next_input(*context);
        }
        catch (Kakoune::runtime_error& error)
        {
            ui->print_status(error.description(), -1);
        }
    });

    context->draw_ifn();
    return client;
}

std::vector<Client> clients;

void setup_server()
{
    auto filename = "/tmp/kak-" + int_to_str(getpid());

    int listen_sock = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
    sockaddr_un addr;
    addr.sun_family = AF_UNIX;
    strncpy(addr.sun_path, filename.c_str(), sizeof(addr.sun_path) - 1);

    if (bind(listen_sock, (sockaddr*) &addr, sizeof(sockaddr_un)) == -1)
       throw runtime_error("unable to bind listen socket " + filename);

    if (listen(listen_sock, 4) == -1)
       throw runtime_error("unable to listen on socket " + filename);

    auto accepter = [=](int socket) {
        sockaddr_un client_addr;
        socklen_t   client_addr_len = sizeof(sockaddr_un);
        int sock = accept(socket, (sockaddr*) &client_addr, &client_addr_len);
        if (sock == -1)
            throw runtime_error("accept failed");

        auto& buffer = *BufferManager::instance().begin();
        RemoteUI* ui = new RemoteUI{sock};
        Client client{ui, *buffer->get_or_create_window()};
        InputHandler*  input_handler = client.input_handler.get();
        Context*       context = client.context.get();
        EventManager::instance().watch(sock, [=](int) {
            try
            {
                input_handler->handle_next_input(*context);
            }
            catch (Kakoune::runtime_error& error)
            {
                ui->print_status(error.description(), -1);
            }
        });
        clients.push_back(std::move(client));
    };
    EventManager::instance().watch(listen_sock, accepter);
}

RemoteClient* connect_to(const String& pid)
{
    auto filename = "/tmp/kak-" + pid;

    int sock = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
    sockaddr_un addr;
    addr.sun_family = AF_UNIX;
    strncpy(addr.sun_path, filename.c_str(), sizeof(addr.sun_path) - 1);
    if (connect(sock, (sockaddr*)&addr, sizeof(addr.sun_path)) == -1)
        throw runtime_error("connect to " + filename + " failed");

    NCursesUI* ui = new NCursesUI{};
    RemoteClient* remote_client = new RemoteClient{sock, ui};

    EventManager::instance().watch(sock, [=](int) {
        try
        {
            remote_client->process_next_message();
        }
        catch (Kakoune::runtime_error& error)
        {
            ui->print_status(error.description(), -1);
        }
    });

    EventManager::instance().watch(0, [=](int) {
        try
        {
            remote_client->write_next_key();
        }
        catch (Kakoune::runtime_error& error)
        {
            ui->print_status(error.description(), -1);
        }
    });

    return remote_client;
}

int main(int argc, char* argv[])
{
    try
    {
        EventManager        event_manager;

        if (argc == 3 and String("-c") == argv[1])
        {
            std::unique_ptr<RemoteClient> client(connect_to(argv[2]));
            while(not quit_requested)
                event_manager.handle_next_events();
            return 0;
        }

        GlobalOptionManager option_manager;
        GlobalHookManager   hook_manager;
        ShellManager        shell_manager;
        CommandManager      command_manager;
        BufferManager       buffer_manager;
        RegisterManager     register_manager;
        HighlighterRegistry highlighter_registry;
        FilterRegistry      filter_registry;
        ColorRegistry       color_registry;

        run_unit_tests();

        register_env_vars();
        register_registers();
        register_commands();
        register_highlighters();
        register_filters();

        write_debug("*** This is the debug buffer, where debug info will be written ***\n");
        write_debug("pid: " + int_to_str(getpid()) + "\n");
        write_debug("utf-8 test: é á ï");

        setup_server();

        Client local_client;
        try
        {
            Context initialisation_context;
            command_manager.execute("source " + runtime_directory() + "/kakrc",
                                    initialisation_context);
        }
        catch (Kakoune::runtime_error& error)
        {
             write_debug("error while parsing kakrc: " + error.description());
        }
        local_client = create_local_client(argc > 1 ? argv[1] : "");

        while(not quit_requested)
            event_manager.handle_next_events();
    }
    catch (Kakoune::exception& error)
    {
        puts("uncaught exception:\n");
        puts(error.description().c_str());
        return -1;
    }
    return 0;
}