Add simple ruby webserver for templating

.gitignore

@@ -0,0 +1,2 @@
+vendor/*
+.bundle/

Gemfile

@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+gem 'sinatra'
+gem 'sinatra-contrib'

Gemfile.lock

@@ -0,0 +1,45 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (5.2.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    backports (3.11.4)
+    concurrent-ruby (1.0.5)
+    i18n (1.1.0)
+      concurrent-ruby (~> 1.0)
+    minitest (5.11.3)
+    multi_json (1.13.1)
+    mustermann (1.0.3)
+    rack (2.0.5)
+    rack-protection (2.0.4)
+      rack
+    sinatra (2.0.4)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.4)
+      tilt (~> 2.0)
+    sinatra-contrib (2.0.4)
+      activesupport (>= 4.0.0)
+      backports (>= 2.8.2)
+      multi_json
+      mustermann (~> 1.0)
+      rack-protection (= 2.0.4)
+      sinatra (= 2.0.4)
+      tilt (>= 1.3, < 3)
+    thread_safe (0.3.6)
+    tilt (2.0.8)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  sinatra
+  sinatra-contrib
+
+BUNDLED WITH
+   1.16.1

config.ru

@@ -0,0 +1,4 @@
+$LOAD_PATH.unshift(File.expand_path('lib', __dir__))
+require 'server'
+
+run Server

lib/server.rb

@@ -0,0 +1,57 @@
+require 'sinatra/base'
+require 'sinatra/reloader'
+
+class Result
+  attr_reader :content, :type
+
+  def initialize(content, type)
+    @content = content
+    @type = type
+  end
+end
+
+class ServerError < RuntimeError
+  attr_reader :type, :text
+
+  def initialize(type, text)
+    @type = type
+    @text = text
+  end
+end
+
+class Server < Sinatra::Application
+  def resolve_path(file)
+    p :resolve_path => file
+    return file if File.file? file
+    return resolve_path(file + '.erb') if File.file? file + '.erb'
+    return resolve_path(File.join(file, 'index.html')) if File.directory? file
+    raise ServerError.new(404, "File not found: #{file}")
+  end
+
+  def resolve_type(filename)
+    case File.extname(filename.gsub(/\.erb$/, ''))
+    when '.css'
+      'text/css'
+    when '.svg'
+      'image/svg+xml'
+    when '.png'
+      'image/png'
+    else
+      'text/html'
+    end
+  end
+
+  def render(file)
+    Result.new(File.read(file), resolve_type(file))
+  end
+
+  get '/*' do
+    begin
+      result = render(resolve_path(params[:splat].first))
+      content_type result.type
+      result.content
+    rescue ServerError => e
+      [e.type, e.text]
+    end
+  end
+end