1 files changed, 74 insertions, 0 deletions
diff --git a/lib/rdoc/markup/to_bs.rb b/lib/rdoc/markup/to_bs.rb
new file mode 100644
index 0000000000..e7af129824
--- /dev/null
+++ b/lib/rdoc/markup/to_bs.rb
@@ -0,0 +1,74 @@
+require 'rdoc/markup/inline'
+
+##
+# Outputs RDoc markup with hot backspace action!  You will probably need a
+# pager to use this output format.
+#
+# This formatter won't work on 1.8.6 because it lacks String#chars.
+
+class RDoc::Markup::ToBs < RDoc::Markup::ToRdoc
+
+  def initialize
+    super
+
+    @in_b  = false
+    @in_em = false
+  end
+
+  ##
+  # Sets a flag that is picked up by #annotate to do the right thing in
+  # #convert_string
+
+  def init_tags
+    add_tag :BOLD, '+b', '-b'
+    add_tag :EM,   '+_', '-_'
+  end
+
+  def accept_heading heading
+    use_prefix or @res << ' ' * @indent
+    @res << @headings[heading.level][0]
+    @in_b = true
+    @res << attributes(heading.text)
+    @in_b = false
+    @res << @headings[heading.level][1]
+    @res << "\n"
+  end
+
+  ##
+  # Turns on or off special handling for +convert_string+
+
+  def annotate tag
+    case tag
+    when '+b' then @in_b = true
+    when '-b' then @in_b = false
+    when '+_' then @in_em = true
+    when '-_' then @in_em = false
+    end
+
+    ''
+  end
+
+  ##
+  # Calls convert_string on the result of convert_special
+
+  def convert_special special
+    convert_string super
+  end
+
+  ##
+  # Adds bold or underline mixed with backspaces
+
+  def convert_string string
+    return string unless string.respond_to? :chars # your ruby is lame
+    return string unless @in_b or @in_em
+    chars = if @in_b then
+              string.chars.map do |char| "#{char}\b#{char}" end
+            elsif @in_em then
+              string.chars.map do |char| "_\b#{char}" end
+            end
+
+    chars.join
+  end
+
+end
+