Add ui_options option for UserInterface configuration

ui_options is a std::unordered_map<String, String> that gets
forwarded to the user interface. Add support ncurses_status_on_top.

src/client.cc

@@ -24,10 +24,14 @@ Client::Client(std::unique_ptr<UserInterface>&& ui,
 {
     context().set_client(*this);
     context().set_window(*m_window);
+
+    m_window->options().register_watcher(*this);
+    m_ui->set_ui_options(m_window->options()["ui_options"].get<UserInterface::Options>());
 }
 
 Client::~Client()
 {
+    m_window->options().unregister_watcher(*this);
 }
 
 void Client::handle_available_input()
@@ -77,13 +81,19 @@ DisplayLine Client::generate_mode_line() const
 void Client::change_buffer(Buffer& buffer)
 {
     auto& client_manager = ClientManager::instance();
+    m_window->options().unregister_watcher(*this);
     client_manager.add_free_window(std::move(m_window),
                                    std::move(context().selections()));
     WindowAndSelections ws = client_manager.get_free_window(buffer);
+
     m_window = std::move(ws.window);
+    m_window->options().register_watcher(*this);
+    m_ui->set_ui_options(m_window->options()["ui_options"].get<UserInterface::Options>());
+
     context().m_selections = std::move(ws.selections);
     context().set_window(*m_window);
     m_window->set_dimensions(ui().dimensions());
+
     m_window->hooks().run_hook("WinDisplay", buffer.name(), context());
 }
 
@@ -181,4 +191,10 @@ const String& Client::get_env_var(const String& name) const
     return it->second;
 }
 
+void Client::on_option_changed(const Option& option)
+{
+    if (option.name() == "ui_options")
+        m_ui->set_ui_options(option.get<UserInterface::Options>());
+}
+
 }

src/client.hh

@@ -7,6 +7,7 @@
 #include "safe_ptr.hh"
 #include "string.hh"
 #include "utils.hh"
+#include "option_manager.hh"
 
 namespace Kakoune
 {
@@ -14,7 +15,7 @@ namespace Kakoune
 class UserInterface;
 class Window;
 
-class Client : public SafeCountable
+class Client : public SafeCountable, public OptionManagerWatcher
 {
 public:
     Client(std::unique_ptr<UserInterface>&& ui,
@@ -24,6 +25,8 @@ public:
            String name);
     ~Client();
 
+    Client(Client&&) = delete;
+
     // handle all the keys currently available in the user interface
     void handle_available_input();
 
@@ -47,6 +50,8 @@ public:
     const String& get_env_var(const String& name) const;
 
 private:
+    void on_option_changed(const Option& option) override;
+
     DisplayLine generate_mode_line() const;
 
     std::unique_ptr<UserInterface> m_ui;

src/main.cc

@@ -229,6 +229,9 @@ void register_options()
     reg.declare_option("autoreload",
                        "autoreload buffer when a filesystem modification is detected",
                        Ask);
+    reg.declare_option("ui_options",
+                       "options passed to UI as a string map",
+                       UserInterface::Options());
 }
 
 void create_local_client(const String& init_command)

src/ncurses.cc

@@ -25,8 +25,6 @@
 namespace Kakoune
 {
 
-constexpr bool status_on_top = true;
-
 using std::min;
 using std::max;
 
@@ -337,7 +335,7 @@ void NCursesUI::draw(const DisplayBuffer& display_buffer,
 {
     check_resize();
 
-    LineCount line_index = status_on_top ? 1 : 0;
+    LineCount line_index = m_status_on_top ? 1 : 0;
     for (const DisplayLine& line : display_buffer.lines())
     {
         wmove(m_window, (int)line_index, 0);
@@ -347,14 +345,14 @@ void NCursesUI::draw(const DisplayBuffer& display_buffer,
     }
 
     set_face(m_window, { Colors::Blue, Colors::Default });
-    while (line_index < m_dimensions.line + (status_on_top ? 1 : 0))
+    while (line_index < m_dimensions.line + (m_status_on_top ? 1 : 0))
     {
         wmove(m_window, (int)line_index++, 0);
         wclrtoeol(m_window);
         waddch(m_window, '~');
     }
 
-    int status_line_pos = status_on_top ? 0 : (int)m_dimensions.line;
+    int status_line_pos = m_status_on_top ? 0 : (int)m_dimensions.line;
     wmove(m_window, status_line_pos, 0);
     wclrtoeol(m_window);
     draw_line(status_line, 0);
@@ -551,8 +549,8 @@ void NCursesUI::menu_show(memoryview<String> items,
     m_menu_bg = bg;
 
     if (style == MenuStyle::Prompt)
-        anchor = CharCoord{status_on_top ? 0_line : m_dimensions.line, 0};
-    else if (status_on_top)
+        anchor = CharCoord{m_status_on_top ? 0_line : m_dimensions.line, 0};
+    else if (m_status_on_top)
         anchor.line += 1;
 
     CharCoord maxsize = window_size(stdscr);
@@ -797,10 +795,10 @@ void NCursesUI::info_show(StringView title, StringView content,
     {
         fancy_info_box = make_info_box(title, content, m_dimensions.column);
         info_box = fancy_info_box;
-        anchor = CharCoord{status_on_top ? 0 : m_dimensions.line,
+        anchor = CharCoord{m_status_on_top ? 0 : m_dimensions.line,
                            m_dimensions.column-1};
     }
-    else if (status_on_top)
+    else if (m_status_on_top)
         anchor.line += 1;
 
     CharCoord size = compute_needed_size(info_box);
@@ -853,4 +851,11 @@ void NCursesUI::abort()
     endwin();
 }
 
+void NCursesUI::set_ui_options(const Options& options)
+{
+    auto it = options.find("ncurses_status_on_top");
+    if (it != options.end())
+        m_status_on_top = it->second == "yes" or it->second == "true";
+}
+
 }

src/ncurses.hh

@@ -41,6 +41,8 @@ public:
 
     void set_input_callback(InputCallback callback) override;
 
+    void set_ui_options(const Options& options) override;
+
     CharCoord dimensions() override;
 
     static void abort();
@@ -68,6 +70,8 @@ private:
     FDWatcher     m_stdin_watcher;
     InputCallback m_input_callback;
 
+    bool m_status_on_top = false;
+
     bool m_dirty = false;
 };
 

src/remote.cc

@@ -26,7 +26,8 @@ enum class RemoteUIMsg
     InfoShow,
     InfoHide,
     Draw,
-    Refresh
+    Refresh,
+    SetOptions
 };
 
 struct socket_error{};
@@ -271,6 +272,8 @@ public:
 
     void set_input_callback(InputCallback callback) override;
 
+    void set_ui_options(const Options& options) override;
+
 private:
     FDWatcher    m_socket_watcher;
     CharCoord m_dimensions;
@@ -357,6 +360,13 @@ void RemoteUI::refresh()
     msg.write(RemoteUIMsg::Refresh);
 }
 
+void RemoteUI::set_ui_options(const Options& options)
+{
+    Message msg(m_socket_watcher.fd());
+    msg.write(RemoteUIMsg::SetOptions);
+    msg.write(options);
+}
+
 static const Key::Modifiers resize_modifier = (Key::Modifiers)0x80;
 
 bool RemoteUI::is_key_available()
@@ -508,6 +518,9 @@ void RemoteClient::process_next_message()
     case RemoteUIMsg::Refresh:
         m_ui->refresh();
         break;
+    case RemoteUIMsg::SetOptions:
+        m_ui->set_ui_options(read_map<String, String>(socket));
+        break;
     }
 }
 

src/user_interface.hh

@@ -6,6 +6,8 @@
 #include "memoryview.hh"
 #include "safe_ptr.hh"
 
+#include <unordered_map>
+
 namespace Kakoune
 {
 
@@ -57,6 +59,9 @@ public:
     virtual void refresh() = 0;
 
     virtual void set_input_callback(InputCallback callback) = 0;
+
+    using Options = std::unordered_map<String, String>;
+    virtual void set_ui_options(const Options& options) = 0;
 };
 
 }