Module:Gutenberg/sandbox

This is the module sandbox page for Module:Gutenberg (diff).
local p = {}
 
function p.author(frame)
  
  local pframe = frame:getParent()
  local args = pframe.args
 
  local tname = "Gutenberg author" -- name of calling template. Change if template is renamed.
 
  local id       = nil -- author name, or author number. The later will go direct to the author page, the former to a search results page.
  local name     = nil -- display name on Wikipedia (default: article title)
  local url      = nil
  local tagline  = "at [[Project Gutenberg]]"
  local urlheadname  = "//www.gutenberg.org/author/"
  local urlheadnumb  = "http://www.gutenberg.org/ebooks/author/" -- SSL problems. See [[Template_talk:Gutenberg_author#https_problem]]
  local urlhead  = nil

  id = trimArg(args[1]) or trimArg(args.id)
  if not id then
    error("Parameter id is missing. See [[Template:" .. tname .. "]] documentation")
  else
    if tonumber(id) then -- it's a number
      urlhead = urlheadnumb
    else
      urlhead = urlheadname
    end
  end 

  name = trimArg(args[2]) or trimArg(args.name)
  if not name then
    name = mw.title.getCurrentTitle().text:gsub('%s+%([^%(]-%)$', '') -- Current page name without the final parentheses
  end

  url = "[" .. urlhead .. id .. " Works by " .. name .. "] " .. tagline

  return url

end

function trimArg(arg)

  if arg == "" or arg == nil then
    return nil
  else
    return mw.text.trim(arg)
  end

end

return p
Usage
