From 10f4bb5872092370012a365c6b3bf8a459e8af88 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Wed, 15 Jul 2015 13:56:31 +0100
Subject: [PATCH] Add support for FocusIn/FocusOut events from UI

---
 src/client.cc     |  4 ++++
 src/keys.hh       |  2 ++
 src/ncurses_ui.cc | 13 +++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/src/client.cc b/src/client.cc
index e7a8085df..9abff7012 100644
--- a/src/client.cc
+++ b/src/client.cc
@@ -69,6 +69,10 @@ void Client::handle_available_input(EventMode mode)
             {
                 if (*key == ctrl('c'))
                     killpg(getpgrp(), SIGINT);
+                else if (*key == Key::FocusIn)
+                    context().hooks().run_hook("FocusIn", context().name(), context());
+                else if (*key == Key::FocusOut)
+                    context().hooks().run_hook("FocusOut", context().name(), context());
                 else
                     m_input_handler.handle_key(*key);
             }
diff --git a/src/keys.hh b/src/keys.hh
index 7cb957df5..d9865f77c 100644
--- a/src/keys.hh
+++ b/src/keys.hh
@@ -54,6 +54,8 @@ struct Key
         F10,
         F11,
         F12,
+        FocusIn,
+        FocusOut,
         Invalid,
     };
 
diff --git a/src/ncurses_ui.cc b/src/ncurses_ui.cc
index 1fc1f0d4e..b9ad3a52e 100644
--- a/src/ncurses_ui.cc
+++ b/src/ncurses_ui.cc
@@ -261,6 +261,8 @@ NCursesUI::NCursesUI()
     mouseinterval(0);
     // force enable report mouse position
     puts("\033[?1002h");
+    // force enable report focus events
+    puts("\033[?1004h");
 
     signal(SIGWINCH, on_term_resize);
     signal(SIGINT, [](int){});
@@ -272,6 +274,7 @@ NCursesUI::NCursesUI()
 
 NCursesUI::~NCursesUI()
 {
+    puts("\033[?1004l");
     puts("\033[?1002l");
     endwin();
     signal(SIGWINCH, SIG_DFL);
@@ -509,6 +512,16 @@ Key NCursesUI::get_key()
     {
         timeout(0);
         const Codepoint new_c = getch();
+        if (new_c == '[') // potential CSI
+        {
+            const Codepoint csi_val = getch();
+            switch (csi_val)
+            {
+                case 'I': return Key::FocusIn;
+                case 'O': return Key::FocusOut;
+                default: break; // nothing
+            }
+        }
         timeout(-1);
         if (new_c != ERR)
         {