From 4e83c39a9ca00a3cd8fea56e45a028f7290a3a7b Mon Sep 17 00:00:00 2001
From: Adrian Cochrane <alcinnz@eml.cc>
Date: Tue, 17 Apr 2018 12:36:00 +1200
Subject: [PATCH] Prefer the dark theme if it successfully darkened the
 textview.

Or rather brightened the text.

11min.
---
 src/window.vala | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/window.vala b/src/window.vala
index c5eea4b..a3a6bfc 100644
--- a/src/window.vala
+++ b/src/window.vala
@@ -47,7 +47,13 @@ public class WriteAs.MainWindow : Gtk.ApplicationWindow {
 
             var css = "";
             if (dark_mode) {
-                css = "* {background: black; color: white;}";
+                // Try to detect whether the system provided a better dark mode.
+                var text_color = styles.get_color(Gtk.StateFlags.ACTIVE);
+                double h, s, v;
+                Gtk.rgb_to_hsv(text_color.red, text_color.green, text_color.blue,
+                        out h, out s, out v);
+
+                if (v < 0.5) css = "* {background: black; color: white;}";
             }
             cur_styles = new Gtk.CssProvider();
             cur_styles.load_from_data(css);