From 85df7ce2da2caa8910151a28fcd42f46ea150a6b Mon Sep 17 00:00:00 2001
From: Thomas Hebb <tommyhebb@gmail.com>
Date: Mon, 30 Nov 2020 12:05:18 -0800
Subject: [PATCH] Add debug log message to print each bar's widget tree

This is very useful when writing CSS that affects more than just a
single widget. Pass `-l debug` to enable debug logging and show this
information.

Example output:

    [2020-11-30 12:38:51.141] [debug] GTK widget tree:
    window#waybar.background.bottom.eDP-1.:dir(ltr)
      decoration:dir(ltr)
      box.horizontal:dir(ltr)
        box.horizontal.modules-left:dir(ltr)
          widget:dir(ltr)
            box#workspaces.horizontal:dir(ltr)
          widget:dir(ltr)
            label#mode:dir(ltr)
          widget:dir(ltr)
            label#window:dir(ltr)
        box.horizontal.modules-center:dir(ltr)
        box.horizontal.modules-right:dir(ltr)
          widget:dir(ltr)
            box#tray.horizontal:dir(ltr)
          widget:dir(ltr)
            label#idle_inhibitor:dir(ltr)
          widget:dir(ltr)
            label#pulseaudio:dir(ltr)
          widget:dir(ltr)
            label#network:dir(ltr)
          widget:dir(ltr)
            label#cpu:dir(ltr)
          widget:dir(ltr)
            label#memory:dir(ltr)
          widget:dir(ltr)
            label#temperature:dir(ltr)
          widget:dir(ltr)
            label#backlight:dir(ltr)
          widget:dir(ltr)
            label#battery:dir(ltr)
          widget:dir(ltr)
            label#clock:dir(ltr)
---
 src/bar.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/bar.cpp b/src/bar.cpp
index 771adab5..7bd61727 100644
--- a/src/bar.cpp
+++ b/src/bar.cpp
@@ -460,6 +460,16 @@ waybar::Bar::Bar(struct waybar_output* w_output, const Json::Value& w_config)
 
   setupWidgets();
   window.show_all();
+
+  if (spdlog::should_log(spdlog::level::debug)) {
+    // Unfortunately, this function isn't in the C++ bindings, so we have to call the C version.
+    char* gtk_tree = gtk_style_context_to_string(
+        window.get_style_context()->gobj(),
+        (GtkStyleContextPrintFlags)(GTK_STYLE_CONTEXT_PRINT_RECURSE |
+                                    GTK_STYLE_CONTEXT_PRINT_SHOW_STYLE));
+    spdlog::debug("GTK widget tree:\n{}", gtk_tree);
+    g_free(gtk_tree);
+  }
 }
 
 void waybar::Bar::onMap(GdkEventAny*) {