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+# Copyright (C) 2019 all contributors <olddoc-public@80x24.org>
+# License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
+
+# Loosely derived from Darkfish in the main rdoc distribution
+require_relative 'oldweb'
+
+# dark216 is an \RDoc template and not intended as a programming API.
+# It respect prefers-color-scheme:light on newer browsers with CSS
+# support, but favors darkness for power-savings.
+# You may specify it as an \RDoc formatter:
+#
+#   rdoc -f dark216 ...
+class Dark216 < Oldweb
+  RDoc::RDoc.add_generator(self) # :nodoc:
+  include ERB::Util # :nodoc:
+
+  # description of the generator
+  DESCRIPTION = 'minimal dark HTML generator'
+
+  # default to a dark, web-safe (216 color) palette for power-savings.
+  # Color-capable browsers can respect the prefers-color-scheme:light
+  # @media query (browser support a work-in-progress)
+  STYLE = <<''.gsub(/^\s*/m, '').delete!("\n") # :nodoc:
+@media screen {
+  *{background:#000;color:#ccc}
+  a{color:#69f}
+  a:visited{color:#96f}
+}
+@media screen AND (prefers-color-scheme:light) {
+  *{background:#fff;color:#333}
+  a{color:#00f}
+  a:visited{color:#808}
+}
+
+  def initialize(*args) # :nodoc:
+    super
+    @oldweb_style = STYLE
+  end
+end
+# :startdoc: