return {
  _coffee = "coffeescript",
  _js = "javascript",
  a51 = "assembly",
  appsrc = "erlang",
  aux = "tex",
  aw = "php",
  bats = "shell",
  bbx = "tex",
  bones = "javascript",
  boot = "clojure",
  cake = "c#",
  cats = "c",
  cbx = "tex",
  cgi = "perl",
  cjsx = "coffeescript",
  cl2 = "clojure",
  cljscm = "clojure",
  cljshl = "clojure",
  cmakein = "cmake",
  cmd = "batchfile",
  coffee = "coffeescript",
  command = "shell",
  cp = "c++",
  cr = "crystal",
  dfm = "pascal",
  di = "d",
  dockerfile = "dockerfile",
  eliom = "ocaml",
  eliomi = "ocaml",
  emacs = "emacs lisp",
  emacsdesktop = "emacs lisp",
  es6 = "javascript",
  escript = "erlang",
  eye = "ruby",
  fcgi = "lua",
  fp = "glsl",
  frag = "javascript",
  frg = "glsl",
  fsh = "glsl",
  fshader = "glsl",
  geo = "glsl",
  geom = "glsl",
  glslf = "glsl",
  glslv = "glsl",
  god = "ruby",
  grt = "groovy",
  gshader = "glsl",
  gtpl = "groovy",
  gvy = "groovy",
  gyp = "python",
  gypi = "python",
  ["h++"] = "c++",
  handlebars = "handlebars",
  hic = "clojure",
  hta = "html",
  htmlhl = "html",
  hx = "haxe",
  hxsl = "haxe",
  iced = "coffeescript",
  idc = "c",
  ins = "tex",
  ixx = "c++",
  jade = "pug",
  jake = "javascript",
  jbuilder = "ruby",
  jsb = "javascript",
  jscad = "javascript",
  jsfl = "javascript",
  jslib = "javascript",
  jsm = "javascript",
  jsonnet = "jsonnet",
  jspre = "javascript",
  jss = "javascript",
  kojo = "scala",
  lbx = "tex",
  libsonnet = "jsonnet",
  linq = "c#",
  lmi = "python",
  make = "makefile",
  makefile = "makefile",
  matlab = "matlab",
  mdx = "markdown",
  me = "roff",
  mkdown = "markdown",
  mkfile = "makefile",
  ml4 = "ocaml",
  mspec = "ruby",
  nasm = "assembly",
  njs = "javascript",
  nomad = "hcl",
  ny = "common lisp",
  p8 = "lua",
  pascal = "pascal",
  pd_lua = "lua",
  perl = "perl",
  pgsql = "plpgsql",
  ph = "perl",
  php3 = "php",
  php4 = "php",
  php5 = "php",
  phps = "php",
  pm = "perl",
  podsl = "common lisp",
  podspec = "ruby",
  prawn = "ruby",
  py3 = "python",
  pyde = "python",
  pyp = "python",
  pyt = "python",
  rabl = "ruby",
  rbi = "ruby",
  rbuild = "ruby",
  rbx = "ruby",
  rbxs = "lua",
  rchit = "glsl",
  re = "c++",
  rmiss = "glsl",
  ronn = "markdown",
  rpy = "python",
  rsin = "rust",
  rsx = "r",
  ruby = "ruby",
  shader = "glsl",
  shin = "shell",
  sjs = "javascript",
  sls = "scheme",
  smk = "python",
  sps = "scheme",
  ssjs = "javascript",
  t = "perl",
  tac = "python",
  tesc = "glsl",
  tese = "glsl",
  thor = "ruby",
  tmux = "shell",
  tool = "shell",
  vapi = "vala",
  vert = "glsl",
  vimrc = "vim script",
  vmb = "vim script",
  vrx = "glsl",
  vsh = "glsl",
  vshader = "glsl",
  watchr = "ruby",
  wlua = "lua",
  workbook = "markdown",
  workflow = "hcl",
  wsgi = "python",
  xpy = "python",
  xrl = "erlang",
  xsjs = "javascript",
  xsjslib = "javascript",
  yrl = "erlang",
  ["zsh-theme"] = "shell"
}