From 5eaf472fc0fd0d2e5a76ab91f685ea89018a6d33 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Sun, 22 Mar 2015 10:08:44 +0000
Subject: [PATCH] Experimental support for mouse

---
 src/input_handler.cc | 47 +++++++++++++++++++++++++++++++++++++++++++-
 src/keys.hh          | 15 +++++++++++++-
 src/ncurses_ui.cc    | 18 +++++++++++++++++
 3 files changed, 78 insertions(+), 2 deletions(-)

diff --git a/src/input_handler.cc b/src/input_handler.cc
index 08412a02..7b6339ff 100644
--- a/src/input_handler.cc
+++ b/src/input_handler.cc
@@ -49,6 +49,45 @@ namespace InputModes
 static constexpr std::chrono::milliseconds idle_timeout{50};
 static constexpr std::chrono::milliseconds fs_check_timeout{500};
 
+struct MouseHandler
+{
+    bool handle_key(Key key, Context& context)
+    {
+        if (not context.has_window())
+            return false;
+
+        if (key.modifiers == Key::Modifiers::MousePress)
+        {
+            m_dragging = true;
+            m_anchor = context.window().buffer_coord(key.mouse_coord());
+            context.selections() = SelectionList{ context.buffer(), m_anchor };
+            return true;
+        }
+        if (key.modifiers == Key::Modifiers::MouseRelease)
+        {
+            if (not m_dragging)
+                return true;
+            m_dragging = false;
+            auto cursor = context.window().buffer_coord(key.mouse_coord());
+            context.selections() = SelectionList{ context.buffer(), Selection{m_anchor, cursor} };
+            return true;
+        }
+        if (key.modifiers == Key::Modifiers::MousePos)
+        {
+            if (not m_dragging)
+                return true;
+            auto cursor = context.window().buffer_coord(key.mouse_coord());
+            context.selections() = SelectionList{ context.buffer(), Selection{m_anchor, cursor} };
+            return true;
+        }
+        return false;
+    }
+
+private:
+    bool m_dragging = false;
+    ByteCoord m_anchor;
+};
+
 class Normal : public InputMode
 {
 public:
@@ -87,6 +126,9 @@ public:
 
     void on_key(Key key) override
     {
+        if (m_mouse_handler.handle_key(key, context()))
+            return;
+
         if (m_waiting_for_reg)
         {
             if (key.modifiers == Key::Modifiers::None)
@@ -139,6 +181,7 @@ public:
             }
             m_params = { 0, '"' };
         }
+
         context().hooks().run_hook("NormalKey", key_to_str(key), context());
         m_idle_timer.set_next_date(Clock::now() + idle_timeout);
     }
@@ -167,6 +210,7 @@ private:
     bool m_waiting_for_reg = false;
     Timer m_idle_timer;
     Timer m_fs_check_timer;
+    MouseHandler m_mouse_handler;
 };
 
 template<WordType word_type>
@@ -1109,7 +1153,8 @@ void InputHandler::on_next_key(KeymapMode keymap_mode, KeyCallback callback)
 
 static bool is_valid(Key key)
 {
-    return key != Key::Invalid and key.key <= 0x10FFFF;
+    return key != Key::Invalid and
+        ((key.modifiers & ~Key::Modifiers::ControlAlt) or key.key <= 0x10FFFF);
 }
 
 void InputHandler::handle_key(Key key)
diff --git a/src/keys.hh b/src/keys.hh
index c83e1361..54c6e175 100644
--- a/src/keys.hh
+++ b/src/keys.hh
@@ -5,6 +5,7 @@
 #include "flags.hh"
 #include "hash.hh"
 #include "vector.hh"
+#include "coord.hh"
 
 namespace Kakoune
 {
@@ -16,7 +17,11 @@ struct Key
         None    = 0,
         Control = 1 << 0,
         Alt     = 1 << 1,
-        ControlAlt = Control | Alt
+        ControlAlt = Control | Alt,
+
+        MousePress   = 1 << 2,
+        MouseRelease = 1 << 3,
+        MousePos     = 1 << 4,
     };
     enum NamedKey : Codepoint
     {
@@ -62,6 +67,8 @@ struct Key
     constexpr bool operator==(Key other) const { return val() == other.val(); }
     constexpr bool operator!=(Key other) const { return val() != other.val(); }
     constexpr bool operator<(Key other) const { return val() < other.val(); }
+
+    constexpr CharCoord mouse_coord() const { return {(int)((key & 0xFFFF0000) >> 16), (int)(key & 0x0000FFFF)}; }
 };
 
 template<> struct WithBitOps<Key::Modifiers> : std::true_type {};
@@ -78,6 +85,12 @@ constexpr Key alt(Codepoint key) { return { Key::Modifiers::Alt, key }; }
 constexpr Key ctrl(Codepoint key) { return { Key::Modifiers::Control, key }; }
 constexpr Key ctrlalt(Codepoint key) { return { Key::Modifiers::ControlAlt, key }; }
 
+constexpr Codepoint encode_mouse_coord(CharCoord coord) { return (Codepoint)(((int)coord.line << 16) | ((int)coord.column & 0x0000FFFF)); }
+
+constexpr Key mouse_press(CharCoord pos) { return { Key::Modifiers::MousePress, encode_mouse_coord(pos) }; }
+constexpr Key mouse_release(CharCoord pos) { return { Key::Modifiers::MouseRelease, encode_mouse_coord(pos) }; }
+constexpr Key mouse_pos(CharCoord pos) { return { Key::Modifiers::MousePos, encode_mouse_coord(pos) }; }
+
 inline size_t hash_value(const Key& key) { return hash_values(key.modifiers, key.key); }
 
 }
diff --git a/src/ncurses_ui.cc b/src/ncurses_ui.cc
index 13de9fd2..55dc3f75 100644
--- a/src/ncurses_ui.cc
+++ b/src/ncurses_ui.cc
@@ -260,6 +260,10 @@ NCursesUI::NCursesUI()
     signal(SIGWINCH, on_term_resize);
     signal(SIGINT, on_sigint);
 
+    mousemask(ALL_MOUSE_EVENTS | REPORT_MOUSE_POSITION, nullptr);
+    mouseinterval(0);
+    // force enable report mouse position
+    printf("\033[?1002h");
     update_dimensions();
 
     wrefresh(stdscr);
@@ -267,6 +271,7 @@ NCursesUI::NCursesUI()
 
 NCursesUI::~NCursesUI()
 {
+    printf("\033[?1002l");
     endwin();
     signal(SIGWINCH, SIG_DFL);
     signal(SIGINT, SIG_DFL);
@@ -442,6 +447,19 @@ Key NCursesUI::get_key()
     check_resize();
 
     const int c = getch();
+
+    if (c == KEY_MOUSE)
+    {
+        MEVENT ev;
+        if (getmouse(&ev) == OK)
+        {
+            CharCoord pos{ ev.y, ev.x };
+            if ((ev.bstate & BUTTON1_PRESSED) == BUTTON1_PRESSED) return mouse_press(pos);
+            if ((ev.bstate & BUTTON1_RELEASED) == BUTTON1_RELEASED) return mouse_release(pos);
+            else return mouse_pos(pos);
+        }
+    }
+
     if (c > 0 and c < 27)
     {
         if (c == CTRL('l'))