const char *argent_script =
   "return function(config)\n"
   "   local fmt = string.format\n"
   "\n"
   "   --------------------------------\n"
   "   --\n"
   "   -- basics\n"
   "   --\n"
   "   --------------------------------\n"
   "\n"
   "   function Set(array, transform)\n"
   "      if type(array) ~= 'table' then return nil end\n"
   "\n"
   "      local transform = transform or function(x) return x end\n"
   "\n"
   "      local set = {}\n"
   "      for _, element in ipairs(array) do\n"
   "	 set[transform(element)] = true\n"
   "      end\n"
   "      return set\n"
   "   end\n"
   "\n"
   "   function set_tostring(set)\n"
   "      local str = '[empty]'\n"
   "      for element in pairs(set) do\n"
   "	 if str == '[empty]' then\n"
   "	    str = tostring(element)\n"
   "	 else\n"
   "	    str = str .. '; '.. tostring(element)\n"
   "	 end\n"
   "      end\n"
   "\n"
   "      return str\n"
   "   end\n"
   "\n"
   "\n"
   "   function add_end_slash(str)\n"
   "      if type(str) ~= 'string' then return nil end\n"
   "      if string.match(str, '/$') then return str end\n"
   "      return str .. '/'\n"
   "   end\n"
   "\n"
   "\n"
   "   function strip_end_slash(str)\n"
   "      if string.match(str, '/$') then return string.sub(str, 1, #str-1) end\n"
   "      return str\n"
   "   end\n"
   "\n"
   "\n"
   "   function load_layouts(directory, parent, layouts)\n"
   "      local directory = add_end_slash(directory) or ''\n"
   "      local parent = parent or ''\n"
   "      local layouts = layouts or {}\n"
   "\n"
   "      local fullpath = parent..directory\n"
   "      local dirs, files = argent.scanDirectory(argent.config.layout_directory..fullpath)\n"
   "\n"
   "      for _, file in ipairs(files) do\n"
   "	 if string.match(file, '%.lua$') then\n"
   "	    local basename = string.gsub(file, '%.lua$', '')\n"
   "	    local id = string.gsub(fullpath..basename, '/', '.')\n"
   "	    argent.log('debug', fmt('loading layout %q', id))\n"
   "	    success, result = pcall(loadfile(argent.config.layout_directory..fullpath..file), 0, 1)\n"
   "	    if not success then\n"
   "	       argent.log('error', result)\n"
   "	       argent.log('warn', fmt('layout %q will not be available', id))\n"
   "	    else\n"
   "	       layouts[id] = result\n"
   "	    end\n"
   "	 end\n"
   "      end\n"
   "\n"
   "      for _, dir in ipairs(dirs) do\n"
   "	 if dir ~= '.' and dir ~= '..' then\n"
   "	    argent.log('debug', fmt('loading layouts from %q', parent..directory))\n"
   "	    load_layouts(dir, parent..directory, layouts)\n"
   "	 end\n"
   "      end\n"
   "\n"
   "      return layouts\n"
   "   end\n"
   "\n"
   "\n"
   "   function setup(config)\n"
   "      argent.log('debug', 'begin setup')\n"
   "      \n"
   "      argent.config = {\n"
   "	 site_directory = add_end_slash(config.site_directory) or 'site/',\n"
   "	 output_directory = add_end_slash(config.output_directory) or 'public/',\n"
   "	 layout_directory = add_end_slash(config.layout_directory) or nil,\n"
   "	 plugin_directory = add_end_slash(config.plugin_directory) or nil,\n"
   "	 exclude = Set(config.exclude, strip_end_slash) or {},\n"
   "	 include = Set(config.include, strip_end_slash) or {},\n"
   "	 keep = Set(config.keep, strip_end_slash) or {},\n"
   "	 noprocess = Set(config.noprocess, strip_end_slash) or {},\n"
   "	 rss_include = Set(config.rss_include, strip_end_slash) or {},\n"
   "      }\n"
   "\n"
   "      argent.log('info', fmt('site directory: %s', argent.config.site_directory))\n"
   "      argent.log('info', fmt('output directory: %s', argent.config.output_directory))\n"
   "      argent.log('info', fmt('layout directory: %s', tostring(argent.config.layout_directory)))\n"
   "      argent.log('info', fmt('plugin directory: %s', tostring(argent.config.plugin_directory)))\n"
   "\n"
   "      argent.log('info', 'exclusions: '..set_tostring(argent.config.exclude))\n"
   "      argent.log('info', 'inclusions: '..set_tostring(argent.config.include))\n"
   "      argent.log('info', 'files to keep: '..set_tostring(argent.config.keep))\n"
   "      argent.log('info', 'noprocess: '..set_tostring(argent.config.noprocess))\n"
   "      argent.log('info', 'rss files: '..set_tostring(argent.config.rss_include))\n"
   "\n"
   "      if argent.config.layout_directory then\n"
   "	 argent.layouts = load_layouts()\n"
   "      else\n"
   "	 argent.layouts = {}\n"
   "      end\n"
   "      argent.log('info', fmt('available layouts: %s', set_tostring(argent.layouts)))\n"
   "      \n"
   "      if argent.config.plugin_directory then\n"
   "	 package.path =\n"
   "	    add_end_slash(argent.currentWorkingDirectory())\n"
   "	    ..argent.config.plugin_directory..'?.lua;'..package.path\n"
   "      end\n"
   "      argent.log('debug', 'end setup')\n"
   "   end\n"
   "\n"
   "\n"
   "   function is_dotfile(filename)\n"
   "      if string.match(filename, '^%.') then return true end\n"
   "      return false\n"
   "   end\n"
   "\n"
   "\n"
   "   function directory_exists(directory, parent)\n"
   "      local directory = directory or ''\n"
   "      local parent = parent or ''\n"
   "      local dirs = argent.scanDirectory(argent.config.output_directory..parent)\n"
   "      for _, dir in ipairs(dirs) do\n"
   "	 if strip_end_slash(directory) == dir then return true end\n"
   "      end\n"
   "      return false\n"
   "   end\n"
   "\n"
   "\n"
   "   function output_directory_exists()\n"
   "      local dirs = argent.scanDirectory('./')\n"
   "      for _, dir in ipairs(dirs) do\n"
   "	 if add_end_slash(dir) == argent.config.output_directory then\n"
   "	    return true\n"
   "	 end\n"
   "      end\n"
   "      return false\n"
   "   end\n"
   "\n"
   "\n"
   "   --------------------------------\n"
   "   --\n"
   "   -- obliterating\n"
   "   --\n"
   "   --------------------------------\n"
   "\n"
   "   function obliterate_file(file, parent)\n"
   "      if argent.config.keep[file] then\n"
   "	 argent.log('debug', fmt('retaining file %q', parent..file))\n"
   "	 return true\n"
   "      end\n"
   "\n"
   "      argent.log('debug', fmt('removing file %q', parent..file))\n"
   "      os.remove(argent.config.output_directory..parent..file)\n"
   "      return false\n"
   "   end\n"
   "\n"
   "\n"
   "   function obliterate_dir(dir, parent)\n"
   "      if argent.config.keep[strip_end_slash(dir)] then\n"
   "	 argent.log('debug', fmt('retaining directory %q', parent..dir))\n"
   "	 return true\n"
   "      end\n"
   "\n"
   "      argent.log('debug', fmt('obliterating files in %q', parent..dir))\n"
   "      return obliterate_directory(dir, parent)\n"
   "   end\n"
   "\n"
   "\n"
   "   function obliterate_directory(dirname, parent)\n"
   "      local dirname = add_end_slash(dirname) or ''\n"
   "      local parent = parent or ''\n"
   "\n"
   "      if argent.config.keep[dirname] then return true end\n"
   "\n"
   "      local keep_self = (dirname == '')\n"
   "\n"
   "      local dirs, files = argent.scanDirectory(argent.config.output_directory..parent..dirname)\n"
   "      for _, file in ipairs(files) do\n"
   "	 keep_self = obliterate_file(file, parent..dirname) or keep_self\n"
   "      end\n"
   "      for _, dir in ipairs(dirs) do\n"
   "	 if dir ~= '.' and dir ~= '..' then\n"
   "	    keep_self = obliterate_dir(dir, parent..dirname) or keep_self\n"
   "	 end\n"
   "      end\n"
   "\n"
   "      if not keep_self then\n"
   "	 os.remove(argent.config.output_directory..parent..dirname)\n"
   "	 return false\n"
   "      else\n"
   "	 return true\n"
   "      end\n"
   "   end\n"
   "\n"
   "\n"
   "   --------------------------------\n"
   "   --\n"
   "   -- processing\n"
   "   --\n"
   "   --------------------------------\n"
   "\n"
   "   function should_include(filename, parent)\n"
   "      for pattern in pairs(argent.config.include) do\n"
   "	 if string.match(filename, pattern) or string.match(parent..filename, pattern) then\n"
   "	    return true\n"
   "	 end\n"
   "      end\n"
   "      return false\n"
   "   end\n"
   "\n"
   "   function should_ignore(filename, parent)\n"
   "      if is_dotfile(filename) and not should_include(filename, parent) then\n"
   "	 return false\n"
   "      end\n"
   "\n"
   "      for pattern in pairs(argent.config.exclude) do\n"
   "	 if string.match(filename, pattern)\n"
   "	    or string.match(parent..filename, pattern) then\n"
   "	    return true\n"
   "	 end\n"
   "      end\n"
   "\n"
   "      return false\n"
   "   end\n"
   "\n"
   "   function process_file(filename, parent)\n"
   "      if should_ignore(filename, parent) then\n"
   "	 argent.log('debug', fmt('will not process file %q', parent..filename))\n"
   "	 return\n"
   "      end\n"
   "\n"
   "      if string.match(filename, '%.lua$') and not argent.config.noprocess[filename] then\n"
   "	 argent.log('debug', fmt('processing %q as lua file', parent..filename))\n"
   "	 process_lua_file(filename, parent)\n"
   "      else\n"
   "	 argent.log('debug', fmt('processing %q as regular file', parent..filename))\n"
   "	 argent.copyFile(\n"
   "	    argent.config.site_directory..parent..filename,\n"
   "	    argent.config.output_directory..parent..filename\n"
   "	 )\n"
   "      end\n"
   "   end\n"
   "\n"
   "\n"
   "   function process_lua_file(filename, parent)\n"
   "      local success, result = pcall(loadfile(argent.config.site_directory..parent..filename))\n"
   "      if not success then\n"
   "	 print('WARNING: '..result)\n"
   "	 return\n"
   "      end\n"
   "\n"
   "      if not type(result) == 'table' then\n"
   "	 argent.log('error', fmt('%q returned %q instead of %q', filename, type(result), 'table'))\n"
   "	 argent.log('warn', fmt('%q will not result in file output!', filename))\n"
   "	 return\n"
   "      end\n"
   "\n"
   "      local html\n"
   "      if result.html then\n"
   "	 html = result.html\n"
   "      elseif result.markdown then\n"
   "	 html = argent.markdown(result.markdown)\n"
   "      else\n"
   "	 argent.log('error', fmt('%q did not specify any content!', filename))\n"
   "	 argent.log('warn', fmt('%q will not result in file output!', filename))\n"
   "	 return\n"
   "      end\n"
   "\n"
   "      if not result.title then\n"
   "	 result.title = string.gsub(filename, '%.lua$', '')\n"
   "	 argent.log('warn', fmt('%q did not specify a title; using default title of %q',\n"
   "				filename, result.title))\n"
   "      end\n"
   "\n"
   "      local layout = function(html, tbl) return html end\n"
   "      if result.layout then\n"
   "	 if not argent.layouts[result.layout] then\n"
   "	    argent.log('error', fmt('%q requested nonexistent layout %q', filename, result.layout))\n"
   "	    argent.log('warn', fmt('%q will not result in file output!', filename))\n"
   "	    return\n"
   "	 else\n"
   "	    layout = argent.layouts[result.layout]\n"
   "	 end\n"
   "      else -- no layout specified\n"
   "	 argent.log('warn', fmt(\n"
   "		       '%q did not specify a layout; output will be naked content!',\n"
   "		       filename))\n"
   "      end\n"
   "\n"
   "      local output_data = layout(html, result)\n"
   "      local output_name = string.gsub(filename, '%.lua$', '.html')\n"
   "      local output_file = io.open(argent.config.output_directory..parent..output_name, 'w')\n"
   "      output_file:write(output_data)\n"
   "      output_file:close()\n"
   "   end\n"
   "\n"
   "\n"
   "   function process_dir(directory, parent)\n"
   "      if should_ignore(directory, parent) then\n"
   "	 argent.log('debug', fmt('will not process directory %q', parent..directory))\n"
   "	 return\n"
   "      end\n"
   "\n"
   "      if not directory_exists(directory, parent) then\n"
   "	 argent.createDirectory(argent.config.output_directory..parent..directory)\n"
   "      end\n"
   "      process_directory(directory, parent)\n"
   "   end\n"
   "\n"
   "\n"
   "   function process_directory(directory, parent)\n"
   "      local directory = add_end_slash(directory) or ''\n"
   "      local parent = add_end_slash(parent) or ''\n"
   "      local dirs, files = argent.scanDirectory(argent.config.site_directory..parent..directory)\n"
   "      for _, file in ipairs(files) do\n"
   "	 process_file(file, parent..directory)\n"
   "      end\n"
   "\n"
   "      for _, dir in ipairs(dirs) do\n"
   "	 if dir ~= '.' and dir ~= '..' then\n"
   "	    process_dir(dir, parent..directory)\n"
   "	 end\n"
   "      end\n"
   "   end\n"
   "\n"
   "\n"
   "   --------------------------------\n"
   "   --\n"
   "   -- putting it all together\n"
   "   --\n"
   "   --------------------------------\n"
   "\n"
   "   setup(config)\n"
   "   if not output_directory_exists() then\n"
   "      argent.createDirectory(argent.config.output_directory)\n"
   "   else\n"
   "      obliterate_directory()\n"
   "   end\n"
   "   process_directory()\n"
   "end\n"
;