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-rw-r--r--lib/dark216.rb40
-rw-r--r--lib/olddoc.rb3
-rw-r--r--lib/oldweb.rb1
-rw-r--r--lib/oldweb/_head.rhtml6
4 files changed, 48 insertions, 2 deletions
diff --git a/lib/dark216.rb b/lib/dark216.rb
new file mode 100644
index 0000000..a01584c
--- /dev/null
+++ b/lib/dark216.rb
@@ -0,0 +1,40 @@
+# 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:
diff --git a/lib/olddoc.rb b/lib/olddoc.rb
index 3061e73..d5d6b37 100644
--- a/lib/olddoc.rb
+++ b/lib/olddoc.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2015-2016 all contributors <olddoc-public@80x24.org>
+# Copyright (C) 2015-2019 all contributors <olddoc-public@80x24.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 module Olddoc # :nodoc:
   autoload :Gemspec, 'olddoc/gemspec'
@@ -16,3 +16,4 @@ module Olddoc # :nodoc:
   end
 end
 require_relative 'oldweb'
+require_relative 'dark216'
diff --git a/lib/oldweb.rb b/lib/oldweb.rb
index ccc37f7..5b55019 100644
--- a/lib/oldweb.rb
+++ b/lib/oldweb.rb
@@ -91,6 +91,7 @@ class Oldweb
       cgit_url << '#n%d' # lineno
       @old_vcs_url = cgit_url
     end
+    @oldweb_style = nil # used by dark216
   end
 
   def generate # :nodoc:
diff --git a/lib/oldweb/_head.rhtml b/lib/oldweb/_head.rhtml
index 720fd95..15a428e 100644
--- a/lib/oldweb/_head.rhtml
+++ b/lib/oldweb/_head.rhtml
@@ -8,4 +8,8 @@ type="application/atom+xml" /><%
 end
 %><meta
 http-equiv="Content-Type"
-content="text/html; charset=<%= @options.charset %>">
+content="text/html; charset=<%= @options.charset %>"><%
+if @oldweb_style
+%><style><%= @oldweb_style %></style><%
+end
+%>