From 7f6a4f4b6bc5c66898efe2ccb588d0aa1e74c525 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Tue, 16 Jul 2019 10:34:08 +0200
Subject: [PATCH] csi: implement FocusIn/Out events

---
 csi.c      |  8 ++++++++
 input.c    |  2 ++
 terminal.c | 16 ++++++++++++++++
 terminal.h |  3 +++
 4 files changed, 29 insertions(+)

diff --git a/csi.c b/csi.c
index 9192c2bb..fe4c0b1d 100644
--- a/csi.c
+++ b/csi.c
@@ -672,6 +672,10 @@ csi_dispatch(struct terminal *term, uint8_t final)
                     term->mouse_tracking = MOUSE_MOTION;
                     break;
 
+                case 1004:
+                    term->focus_events = true;
+                    break;
+
                 case 1005:
                     LOG_WARN("unimplemented: UTF-8 mouse");
                     /* term->mouse_reporting = MOUSE_UTF8; */
@@ -751,6 +755,10 @@ csi_dispatch(struct terminal *term, uint8_t final)
                     term->mouse_tracking = MOUSE_NONE;
                     break;
 
+                case 1004:
+                    term->focus_events = false;
+                    break;
+
                 case 1049:
                     if (term->grid == &term->alt) {
                         term->grid = &term->normal;
diff --git a/input.c b/input.c
index 5bb93132..a50f76cf 100644
--- a/input.c
+++ b/input.c
@@ -65,6 +65,7 @@ keyboard_enter(void *data, struct wl_keyboard *wl_keyboard, uint32_t serial,
     wl_array_for_each(key, keys)
         xkb_state_update_key(xkb_state, *key, 1);
 #endif
+    term_focus_in((struct terminal *)data);
 }
 
 static void
@@ -72,6 +73,7 @@ keyboard_leave(void *data, struct wl_keyboard *wl_keyboard, uint32_t serial,
                struct wl_surface *surface)
 {
     struct terminal *term = data;
+    term_focus_out(term);
 
     mtx_lock(&term->kbd.repeat.mutex);
     if (term->kbd.repeat.cmd != REPEAT_EXIT) {
diff --git a/terminal.c b/terminal.c
index b7c7cf69..5e0f625f 100644
--- a/terminal.c
+++ b/terminal.c
@@ -267,6 +267,22 @@ term_reverse_index(struct terminal *term)
         term_cursor_up(term, 1);
 }
 
+void
+term_focus_in(struct terminal *term)
+{
+    if (!term->focus_events)
+        return;
+    vt_to_slave(term, "\033[I", 3);
+}
+
+void
+term_focus_out(struct terminal *term)
+{
+    if (!term->focus_events)
+        return;
+    vt_to_slave(term, "\033[O", 3);
+}
+
 static int
 linux_mouse_button_to_x(int button)
 {
diff --git a/terminal.h b/terminal.h
index 9af18d7e..b2aaee67 100644
--- a/terminal.h
+++ b/terminal.h
@@ -216,6 +216,7 @@ struct terminal {
     bool auto_margin;
     bool insert_mode;
     bool bracketed_paste;
+    bool focus_events;
     enum mouse_tracking mouse_tracking;
     enum mouse_reporting mouse_reporting;
 
@@ -296,6 +297,8 @@ void term_scroll_reverse_partial(
 void term_linefeed(struct terminal *term);
 void term_reverse_index(struct terminal *term);
 
+void term_focus_in(struct terminal *term);
+void term_focus_out(struct terminal *term);
 void term_mouse_down(struct terminal *term, int button, int row, int col,
                      bool shift, bool alt, bool ctrl);
 void term_mouse_up(struct terminal *term, int button, int row, int col,