Modularize lazy loading of polyglot parts

autoload/polyglot/shebang.vim

@@ -0,0 +1,129 @@
+" Please do not edit this file directly, instead modify polyglot.vim or scripts/build
+
+func! polyglot#shebang#Detect()
+  let ft = s:Filetype()
+  if ft != ""
+    let &ft = ft
+  endif
+
+  if &ft == ""
+    runtime! scripts.vim
+  endif
+
+  return &ft != ""
+endfunc
+
+let s:r_hashbang = '^#!\s*\(\S\+\)\s*\(.*\)\s*'
+let s:r_envflag = '%(\S\+=\S\+\|-[iS]\|--ignore-environment\|--split-string\)'
+let s:r_env = '^\%(\' . s:r_envflag . '\s\+\)*\(\S\+\)'
+
+func! s:Filetype()
+  let l:line1 = getline(1)
+
+  if l:line1 !~# "^#!"
+    return
+  endif
+
+  let l:pathrest = matchlist(l:line1, s:r_hashbang)
+
+  if len(l:pathrest) == 0
+    return
+  endif
+
+  let [_, l:path, l:rest; __] = l:pathrest
+
+  let l:script = split(l:path, "/")[-1]
+
+  if l:script == "env"
+    let l:argspath = matchlist(l:rest, s:r_env)
+    if len(l:argspath) == 0
+      return
+    endif
+
+    let l:script = l:argspath[1]
+  endif
+
+  if has_key(s:interpreters, l:script)
+    return s:interpreters[l:script]
+  endif
+
+  for interpreter in keys(s:interpreters)
+    if l:script =~# '^' . interpreter
+      return s:interpreters[interpreter]
+    endif
+  endfor
+endfunc
+
+
+
+let s:interpreters = {
+  \ 'osascript': 'applescript',
+  \ 'tcc': 'c',
+  \ 'coffee': 'coffee',
+  \ 'crystal': 'crystal',
+  \ 'dart': 'dart',
+  \ 'elixir': 'elixir',
+  \ 'escript': 'erlang',
+  \ 'fish': 'fish',
+  \ 'gnuplot': 'gnuplot',
+  \ 'groovy': 'groovy',
+  \ 'runhaskell': 'haskell',
+  \ 'chakra': 'javascript',
+  \ 'd8': 'javascript',
+  \ 'gjs': 'javascript',
+  \ 'js': 'javascript',
+  \ 'node': 'javascript',
+  \ 'nodejs': 'javascript',
+  \ 'qjs': 'javascript',
+  \ 'rhino': 'javascript',
+  \ 'v8': 'javascript',
+  \ 'v8-shell': 'javascript',
+  \ 'julia': 'julia',
+  \ 'lua': 'lua',
+  \ 'moon': 'moon',
+  \ 'ocaml': 'ocaml',
+  \ 'ocamlrun': 'ocaml',
+  \ 'ocamlscript': 'ocaml',
+  \ 'cperl': 'perl',
+  \ 'perl': 'perl',
+  \ 'php': 'php',
+  \ 'swipl': 'prolog',
+  \ 'yap': 'prolog',
+  \ 'pwsh': 'ps1',
+  \ 'python': 'python',
+  \ 'python2': 'python',
+  \ 'python3': 'python',
+  \ 'qmake': 'qmake',
+  \ 'Rscript': 'r',
+  \ 'racket': 'racket',
+  \ 'perl6': 'raku',
+  \ 'raku': 'raku',
+  \ 'rakudo': 'raku',
+  \ 'ruby': 'ruby',
+  \ 'macruby': 'ruby',
+  \ 'rake': 'ruby',
+  \ 'jruby': 'ruby',
+  \ 'rbx': 'ruby',
+  \ 'scala': 'scala',
+  \ 'ash': 'sh',
+  \ 'bash': 'sh',
+  \ 'dash': 'sh',
+  \ 'ksh': 'sh',
+  \ 'mksh': 'sh',
+  \ 'pdksh': 'sh',
+  \ 'rc': 'sh',
+  \ 'sh': 'sh',
+  \ 'zsh': 'sh',
+  \ 'boolector': 'smt2',
+  \ 'cvc4': 'smt2',
+  \ 'mathsat5': 'smt2',
+  \ 'opensmt': 'smt2',
+  \ 'smtinterpol': 'smt2',
+  \ 'smt-rat': 'smt2',
+  \ 'stp': 'smt2',
+  \ 'verit': 'smt2',
+  \ 'yices2': 'smt2',
+  \ 'z3': 'smt2',
+  \ 'deno': 'typescript',
+  \ 'ts-node': 'typescript',
+  \ }