diff --git a/bin/mmmdpp b/bin/mmmdpp
new file mode 100755
index 0000000..b2c2c9b
--- /dev/null
+++ b/bin/mmmdpp
@@ -0,0 +1,170 @@
+#!/bin/ruby
+# frozen_string_literal: true
+
+require 'io/console/size'
+require 'optionparser'
+require 'json'
+require 'mmmd'
+
+class ParserError < StandardError
+end
+
+class OptionNavigator
+  def initialize
+    @options = {}
+  end
+
+  # Read a definition
+  # @param define [String]
+  def read_definition(define)
+    define.split(";").each do |part|
+      locstring, _, value = part.partition(":")
+      locstring = deconstruct(locstring.strip)
+      assign(locstring, JSON.parse(value))
+    end
+  end
+
+  attr_reader :options
+
+  private
+
+  def check_unescaped(str, index)
+    return true if index.zero?
+
+    reverse_index = index - 1
+    count = 0
+    while str[reverse_index] == "\\"
+      break if reverse_index.zero?
+
+      count += 1
+      reverse_index -= 1
+    end
+    count.even?
+  end
+
+  def find_unescaped(str, pattern, index)
+    found = str.index(pattern, index)
+    return nil unless found
+
+    until check_unescaped(str, found)
+      index = found + 1
+      found = str.index(pattern, index)
+      return nil unless found
+    end
+    found
+  end
+
+  def deconstruct(locstring)
+    parts = []
+    buffer = ""
+    part = nil
+    until locstring.empty?
+      case locstring[0]
+      when '"'
+        raise ParserError, 'separator missing' unless buffer.empty?
+
+        closepart = find_unescaped(locstring, '"', 1)
+        raise ParserError, 'unclosed string' unless closepart
+
+        buffer = locstring[0..closepart]
+        part = buffer[1..-2]
+        locstring = locstring[closepart + 1..]
+      when '.'
+        parts.append(part)
+        buffer = ""
+        part = nil
+        locstring = locstring[1..]
+      when '['
+        raise ParserError, 'separator missing' unless buffer.empty?
+
+        closepart = find_unescaped(locstring, ']', 1)
+        raise ParserError, 'unclosed index' unless closepart
+
+        buffer = locstring[0..closepart]
+        part = locstring[1..-2].to_i
+        locstring = locstring.delete_prefix(buffer)
+      else
+        raise ParserError, 'separator missing' unless buffer.empty?
+
+        buffer = locstring.match(/^[\w_]+/)[0]
+        part = buffer.to_sym
+        locstring = locstring.delete_prefix(buffer)
+      end
+    end
+    parts.append(part) if part
+    parts
+  end
+
+  def assign(keys, value)
+    current = @options
+    while keys.length > 1
+      current_key = keys.shift
+      unless current[current_key]
+        next_key = keys.first
+        case next_key
+        when Integer
+          current[current_key] = []
+        when String
+          current[current_key] = {}
+        when Symbol
+          current[current_key] = {}
+        end
+      end
+      current = current[current_key]
+    end
+    current[keys.shift] = value
+  end
+end
+
+return unless $PROGRAM_NAME == __FILE__
+
+options = {
+  include: [],
+  nav: OptionNavigator.new
+}
+parser = OptionParser.new do |opts|
+  opts.banner = "Usage: mmmdpp [OPTIONS] (input|-) (output|-)"
+
+  opts.on("-r", "--renderer [STRING]", String,
+          "Specify renderer to use for this document") do |renderer|
+    options[:renderer] = renderer
+  end
+
+  opts.on("-i", "--include [STRING]", String,
+          "Script to execute before rendering.\
+          May be specified multiple times.") do |inc|
+    options[:include].append(inc)
+  end
+
+  opts.on("-o", "--option [STRING]", String,
+          "Add option string. Can be repeated. Format: <key>: <JSON value>\n"\
+          "<key>: (<\"string\">|<symbol>|<[integer]>)"\
+          "[.(<\"string\"|<symbol>|<[integer]>[...]]\n"\
+          "Example: \"style\".\"CodeBlock\".literal.[0]: 50") do |value|
+    options[:nav].read_definition(value) if value
+  end
+end
+parser.parse!
+
+unless ARGV[1]
+  warn parser.help
+  exit 1
+end
+
+Renderers = {
+  "HTML" => -> { ::MMMD::Renderers::HTML },
+  "Plainterm" => -> { ::MMMD::Renderers::Plainterm }
+}.freeze
+
+options[:include].each { |name| Kernel.load(name) }
+renderer_opts = options[:nav].options
+renderer_opts["hsize"] ||= IO.console_size[1]
+input = ARGV[0] == "-" ? $stdin.read : File.read(ARGV[0])
+output = ARGV[1] == "-" ? $stdout : File.open(ARGV[1], "w")
+doc = MMMD.parse(input)
+rclass = Renderers[options[:renderer] || "PlainTerm"]
+raise StandardError, "unknown renderer: #{options[:renderer]}" unless rclass
+
+renderer = rclass.call.new(doc, renderer_opts)
+output.puts(renderer.render)
+output.close
diff --git a/lib/mmmd/renderers.rb b/lib/mmmd/renderers.rb
index b6a8b9d..2904103 100644
--- a/lib/mmmd/renderers.rb
+++ b/lib/mmmd/renderers.rb
@@ -6,6 +6,6 @@ module MMMD
   # Renderers from Markdown to expected output format
   module Renderers
     autoload :HTML, 'renderers/html'
-    autoload :PlainTerm, 'renderers/plainterm'
+    autoload :Plainterm, 'renderers/plainterm'
   end
 end
diff --git a/lib/mmmd/renderers/html.rb b/lib/mmmd/renderers/html.rb
index 67a094f..d857643 100644
--- a/lib/mmmd/renderers/html.rb
+++ b/lib/mmmd/renderers/html.rb
@@ -229,7 +229,9 @@ module MMMD
         text = if element.children.empty?
                  element.content
                else
-                 literal = @mapping[element.class.name][:inline] || literaltext
+                 literal = @mapping[element.class.name]
+                           &.fetch(:inline, false) ||
+                           literaltext
                  element.children.map do |child|
                    _render(child, options, inline: inline,
                                            level: level,
diff --git a/lib/mmmd/renderers/plainterm.rb b/lib/mmmd/renderers/plainterm.rb
index 8ad1f48..db022dd 100644
--- a/lib/mmmd/renderers/plainterm.rb
+++ b/lib/mmmd/renderers/plainterm.rb
@@ -396,7 +396,7 @@ module MMMD
         @effect_priority = style_manager.effect_priority
         @effects = @effect_priority.to_a.sort_by(&:last).map(&:first)
         @options = options
-        @options[:hsize] ||= 80
+        @options["hsize"] ||= 80
       end
 
       # Return rendered text
@@ -430,7 +430,7 @@ module MMMD
         element_style = @style[element.class.name]
         return text unless element_style
 
-        hsize = 80 - (4 * level)
+        hsize = @options["hsize"] - (4 * level)
         text = wordwrap(text, hsize) if modeswitch
         params = element_style.dup
         params[:hsize] = hsize
diff --git a/mmmdpp.rb b/mmmdpp.rb
deleted file mode 100644
index ddff607..0000000
--- a/mmmdpp.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/ruby
-# frozen_string_literal: true
-
-require 'optionparser'
-