From 9a4ba81bfa1d76f37b2975a2b48c31395437d947 Mon Sep 17 00:00:00 2001
From: siers <wimuan@gmail.com>
Date: Sun, 3 Aug 2014 05:55:32 +0300
Subject: [PATCH 1/4] Output enter/leave events.

---
 lemonbar.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/lemonbar.c b/lemonbar.c
index 5f36f41..ff066db 100644
--- a/lemonbar.c
+++ b/lemonbar.c
@@ -726,11 +726,16 @@ monitor_new (int x, int y, int width, int height)
     ret->window = xcb_generate_id(c);
 
     int depth = (visual == scr->root_visual) ? XCB_COPY_FROM_PARENT : 32;
+    uint32_t events =
+        XCB_EVENT_MASK_EXPOSURE     |
+        XCB_EVENT_MASK_BUTTON_PRESS |
+        XCB_EVENT_MASK_ENTER_WINDOW |
+        XCB_EVENT_MASK_LEAVE_WINDOW ;
     xcb_create_window(c, depth, ret->window, scr->root,
             ret->x, ret->y, width, bh, 0,
             XCB_WINDOW_CLASS_INPUT_OUTPUT, visual,
             XCB_CW_BACK_PIXEL | XCB_CW_BORDER_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK | XCB_CW_COLORMAP,
-            (const uint32_t []){ bgc.v, bgc.v, dock, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS, colormap });
+            (const uint32_t []){ bgc.v, bgc.v, dock, events, colormap });
 
     ret->pixmap = xcb_generate_id(c);
     xcb_create_pixmap(c, depth, ret->pixmap, ret->window, width, bh);
@@ -1327,6 +1332,13 @@ main (int argc, char **argv)
                                 }
                             }
                             break;
+                        case XCB_ENTER_NOTIFY:
+                        case XCB_LEAVE_NOTIFY:
+                            {
+                                bool entered = ev->response_type == XCB_ENTER_NOTIFY;
+                                write(STDOUT_FILENO, entered ? "enter\n" : "leave\n", 7);
+                            }
+                            break;
                     }
 
                     free(ev);

From 7716a0b40859ea16898be230db3e203888f51f9d Mon Sep 17 00:00:00 2001
From: siers <wimuan@gmail.com>
Date: Sun, 3 Aug 2014 06:06:08 +0300
Subject: [PATCH 2/4] Output enter/leave events only when requested by getopt.

---
 lemonbar.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lemonbar.c b/lemonbar.c
index ff066db..2db2322 100644
--- a/lemonbar.c
+++ b/lemonbar.c
@@ -1239,6 +1239,7 @@ main (int argc, char **argv)
     xcb_button_press_event_t *press_ev;
     char input[4096] = {0, };
     bool permanent = false;
+    bool enterleave = false;
     int geom_v[4] = { -1, -1, 0, 0 };
     int ch;
 
@@ -1256,7 +1257,7 @@ main (int argc, char **argv)
 
     ugc = fgc;
 
-    while ((ch = getopt(argc, argv, "hg:bdf:a:pu:B:F:")) != -1) {
+    while ((ch = getopt(argc, argv, "hg:bdef:a:pu:B:F:")) != -1) {
         switch (ch) {
             case 'h':
                 printf ("lemonbar version %s\n", VERSION);
@@ -1265,6 +1266,7 @@ main (int argc, char **argv)
                         "\t-g Set the bar geometry {width}x{height}+{xoffset}+{yoffset}\n"
                         "\t-b Put the bar at the bottom of the screen\n"
                         "\t-d Force docking (use this if your WM isn't EWMH compliant)\n"
+                        "\t-e Output enter and leave window events\n"
                         "\t-f Bar font list, comma separated\n"
                         "\t-p Don't close after the data ends\n"
                         "\t-u Set the underline/overline height in pixels\n"
@@ -1275,6 +1277,7 @@ main (int argc, char **argv)
             case 'p': permanent = true; break;
             case 'b': topbar = false; break;
             case 'd': dock = true; break;
+            case 'e': enterleave = true; break;
             case 'f': parse_font_list(optarg); break;
             case 'u': bu = strtoul(optarg, NULL, 10); break;
             case 'B': dbgc = bgc = parse_color(optarg, NULL, (rgba_t)scr->black_pixel); break;
@@ -1336,7 +1339,8 @@ main (int argc, char **argv)
                         case XCB_LEAVE_NOTIFY:
                             {
                                 bool entered = ev->response_type == XCB_ENTER_NOTIFY;
-                                write(STDOUT_FILENO, entered ? "enter\n" : "leave\n", 7);
+                                if (enterleave)
+                                    write(STDOUT_FILENO, entered ? "enter\n" : "leave\n", 7);
                             }
                             break;
                     }

From 6394507a346e3497dc3fbaaacbeba50711e2bb4c Mon Sep 17 00:00:00 2001
From: siers <wimuan@gmail.com>
Date: Sun, 3 Aug 2014 06:53:01 +0300
Subject: [PATCH 3/4] Don't print some silly null bytes.

---
 lemonbar.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lemonbar.c b/lemonbar.c
index 2db2322..94ceb8b 100644
--- a/lemonbar.c
+++ b/lemonbar.c
@@ -1340,7 +1340,7 @@ main (int argc, char **argv)
                             {
                                 bool entered = ev->response_type == XCB_ENTER_NOTIFY;
                                 if (enterleave)
-                                    write(STDOUT_FILENO, entered ? "enter\n" : "leave\n", 7);
+                                    write(STDOUT_FILENO, entered ? "enter\n" : "leave\n", 6);
                             }
                             break;
                     }

From b80138ea72be3df02a638a922babed604ec51af5 Mon Sep 17 00:00:00 2001
From: siers <wimuan@gmail.com>
Date: Sun, 3 Aug 2014 08:09:05 +0300
Subject: [PATCH 4/4] Small bits of documentation added.

---
 README.pod | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.pod b/README.pod
index afbed83..930a570 100644
--- a/README.pod
+++ b/README.pod
@@ -32,6 +32,10 @@ Dock the bar at the bottom of the screen.
 
 Force docking without asking the window manager. This is needed if the window manager isn't EWMH compliant.
 
+=item B<-e>
+
+Output enter and leave window events on stdout.
+
 =item B<-f> I<font>
 
 Comma separated list of fonts, lemonbar supports a maximum of five fonts (the limit can be tweaked by changing the MAX_FONT_COUNT parameter in the source).