module SDoc::Templatable

def eval_template(templatefile, context)
  template_src = templatefile.read
  template = if ERB.instance_method(:initialize).parameters.assoc(:key) # Ruby 2.6+
    ERB.new( template_src, trim_mode: '<>' )
  else
    ERB.new( template_src, nil, '<>' )
  end
  template.filename = templatefile.to_s
  begin
    template.result( context )
  rescue NoMethodError => err
    raise RDoc::Error, "Error while evaluating %s: %s (at %p)" % [
      templatefile.to_s,
      err.message,
      eval( "_erbout[-50,50]", context )
      ], err.backtrace
  end
end

def include_template(template_name, local_assigns = {})
  source = local_assigns.keys.map { |key| "#{key} = local_assigns[:#{key}];" }.join
  templatefile = templatefile = @template_dir + template_name
  eval("#{source};eval_template(templatefile, binding)")
end

def render_template( templatefile, context, outfile )
  output = eval_template(templatefile, context)
  # TODO delete this dirty hack when documentation for example for GeneratorMethods will not be cutted off by <script> tag
  begin
    if output.respond_to? :force_encoding
      encoding = output.encoding
      output = output.force_encoding('ASCII-8BIT').gsub('<script>', '&lt;script;&gt;').force_encoding(encoding)
    else
      output = output.gsub('<script>', '&lt;script&gt;')
    end
  rescue Exception
  end
  unless $dryrun
    outfile.dirname.mkpath
    outfile.open( 'w', 0644 ) do |file|
      file.print( output )
    end
  else
    debug_msg "  would have written %d bytes to %s" %
    [ output.length, outfile ]
  end
end