re-integrate runtime/ vim-patch:0 #938

Vim runtime files based on 7.4.384 / hg changeset 7090d7f160f7

Excluding:
  Amiga icons (*.info, icons/)
  doc/hangulin.txt
  tutor/
  spell/
  lang/ (only used for menu translations)
  macros/maze/, macros/hanoi/, macros/life/, macros/urm/
      These were used to test vi compatibility.
  termcap
      "Demonstration of a termcap file (for the Amiga and Archimedes)"

Helped-by: Rich Wareham <rjw57@cam.ac.uk>
Helped-by: John <john.schmidt.h@gmail.com>
Helped-by: Yann <yann@yann-salaun.com>
Helped-by: Christophe Badoit <c.badoit@lesiteimmo.com>
Helped-by: drasill <github@tof2k.com>
Helped-by: Tae Sandoval Murgan <taecilla@gmail.com>
Helped-by: Lowe Thiderman <lowe.thiderman@gmail.com>

runtime/ftplugin.vim

@@ -0,0 +1,35 @@
+" Vim support file to switch on loading plugins for file types
+"
+" Maintainer:	Bram Moolenaar <Bram@vim.org>
+" Last change:	2006 Apr 30
+
+if exists("did_load_ftplugin")
+  finish
+endif
+let did_load_ftplugin = 1
+
+augroup filetypeplugin
+  au FileType * call s:LoadFTPlugin()
+
+  func! s:LoadFTPlugin()
+    if exists("b:undo_ftplugin")
+      exe b:undo_ftplugin
+      unlet! b:undo_ftplugin b:did_ftplugin
+    endif
+
+    let s = expand("<amatch>")
+    if s != ""
+      if &cpo =~# "S" && exists("b:did_ftplugin")
+	" In compatible mode options are reset to the global values, need to
+	" set the local values also when a plugin was already used.
+	unlet b:did_ftplugin
+      endif
+
+      " When there is a dot it is used to separate filetype names.  Thus for
+      " "aaa.bbb" load "aaa" and then "bbb".
+      for name in split(s, '\.')
+	exe 'runtime! ftplugin/' . name . '.vim ftplugin/' . name . '_*.vim ftplugin/' . name . '/*.vim'
+      endfor
+    endif
+  endfunc
+augroup END