Module:StripFilename

This Lua module removes the "File:" or "Image:" namespace prefix and any valid file extension from a given filename (both case-insensitive).

Examples

Input	Output	Notes
{{#invoke:StripFilename|main|File:Example.svg}}	Example
{{#invoke:StripFilename|main|Image:Example.mid}}	Example
{{#invoke:StripFilename|main|Example.JPG}}	Example	Uppercase extension
{{#invoke:StripFilename|main|Example.foo}}	Example.foo	Unknown extension
{{#invoke:StripFilename|main|fiLE:Example.svg}}	Example	Mixed-case namespace (works in MediaWiki)
{{#invoke:StripFilename|svg|Example.pdf}}	Example.svg	keep, replace or add ".svg"

---

local p = {}

function p.main(frame)
  local f = frame["args"][1]
  -- Strip whitespace at beginning and end of input
  f = string.gsub(f,"^%s*(.-)%s*$","%1")
  -- Remove namespace prefix
  f = string.gsub(f,"^[Ff][Ii][Ll][Ee]:(.*)$","%1")
  f = string.gsub(f,"^[Ii][Mm][Aa][Gg][Ee]:(.*)$","%1")
  -- Remove any recognized extension
  local e = string.lower(string.gsub(f,"^.*%.([^%.]*)$","%1"))
  local map = {svg=1, png=1, jpg=1, jpeg=1, gif=1, tif=1, tiff=1, xcf=1, mid=1, ogg=1, ogv=1, djvu=1, oga=1, flac=1, wav=1, webm=1, pdf=1, mp3=1}
  if map[e]
    then n = string.gsub(f,"^(.*)%.[^%.]*$","%1")
    else n = f
  end
  return n
end

function p.svg(frame)
  local f = frame["args"][1]
  -- Strip whitespace at beginning and end of input
  f = string.gsub(f,"^%s*(.-)%s*$","%1")
  -- Remove namespace prefix
  f = string.gsub(f,"^[Ff][Ii][Ll][Ee]:(.*)$","%1")
  f = string.gsub(f,"^[Ii][Mm][Aa][Gg][Ee]:(.*)$","%1")
  -- Replace underscores with spaces
  f = string.gsub(f,"_"," ")
  -- Keep, replace with, or add "svg" extension
  local e = string.lower(string.gsub(f,"^.*%.([^%.]*)$","%1"))
  local map = {png=1, jpg=1, jpeg=1, gif=1, tif=1, tiff=1, xcf=1, mid=1, ogg=1, ogv=1, djvu=1, oga=1, flac=1, wav=1, webm=1, pdf=1, mp3=1}
  if e=="svg"
    then n = f
  elseif map[e]
    then n = string.gsub(f,"^(.*)%.[^%.]*$","%1.svg")
    else n = f..".svg"
  end
  return n
end

return p