From 8402762a1f1e1df7c860b86d7055d9075d290394 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Thu, 1 Jun 2017 03:30:18 -0400
Subject: implement motion mouse reporting

---
 src/window-xlib.c | 38 +++++++++++++++++++++++++++++++-------
 src/window-xlib.h |  3 +++
 2 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/src/window-xlib.c b/src/window-xlib.c
index 0f1b78e..37a7737 100644
--- a/src/window-xlib.c
+++ b/src/window-xlib.c
@@ -153,6 +153,8 @@ RunesWindow *runes_window_new(RunesWindowBackend *wb)
 
     w = calloc(1, sizeof(RunesWindow));
     w->wb = wb;
+    w->last_reported_mouse_position.col = -1;
+    w->last_reported_mouse_position.row = -1;
 
     return w;
 }
@@ -878,14 +880,36 @@ static void runes_window_handle_motion_event(RunesTerm *t, XMotionEvent *e)
 {
     RunesWindow *w = t->w;
 
-    /* unclear why we can't rely on (e->state & Button1Mask) here - it seems to
-     * always be true, which is confusing to me. i'd expect it to only be true
-     * if we had Button1 held down while moving the mouse. */
-    if (!w->mouse_down) {
-        return;
-    }
+    if (vt100_screen_mouse_reporting_wants_any_motion(t->scr)
+        || (vt100_screen_mouse_reporting_wants_button_motion(t->scr)
+            && w->mouse_down)) {
+        char response[7];
+        struct vt100_loc last_loc = w->last_reported_mouse_position;
+        struct vt100_loc loc;
 
-    runes_window_update_selection(t, e->x, e->y, e->time);
+        loc = runes_window_get_mouse_position(t, e->x, e->y);
+        loc.row -= t->scr->grid->row_top;
+        if (loc.col != last_loc.col || loc.row != last_loc.row) {
+            int button =
+                  e->state & Button1Mask ? 1
+                : e->state & Button2Mask ? 2
+                : e->state & Button3Mask ? 3
+                :                          4;
+            sprintf(
+                response, "\033[M%c%c%c",
+                '@' + (button - 1), ' ' + loc.col + 1, ' ' + loc.row + 1);
+            runes_window_write_to_pty(t, response, 6);
+            w->last_reported_mouse_position = loc;
+        }
+    }
+    else {
+        /* unclear why we can't rely on (e->state & Button1Mask) here - it
+         * seems to always be true, which is confusing to me. i'd expect it to
+         * only be true if we had Button1 held down while moving the mouse. */
+        if (w->mouse_down) {
+            runes_window_update_selection(t, e->x, e->y, e->time);
+        }
+    }
 }
 
 static void runes_window_handle_expose_event(RunesTerm *t, XExposeEvent *e)
diff --git a/src/window-xlib.h b/src/window-xlib.h
index c7bca22..4857194 100644
--- a/src/window-xlib.h
+++ b/src/window-xlib.h
@@ -3,6 +3,7 @@
 
 #include <cairo.h>
 #include <time.h>
+#include <vt100.h>
 #include <X11/Xlib.h>
 
 struct runes_window {
@@ -17,6 +18,8 @@ struct runes_window {
     unsigned int multi_clicks;
     void *multi_click_timer_event;
 
+    struct vt100_loc last_reported_mouse_position;
+
     unsigned int owns_selection: 1;
     unsigned int visual_bell_is_ringing: 1;
     unsigned int delaying: 1;
-- 
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