Migrate to a "cplusplus" filetype for C++ in vim.

This "cplusplus" filetype permits the sourcing of `cpp.vim`
and `doxygen.vim` as lower-level files from itself.  This should
permit `doxygen.vim` to source from `cpp.vim` and avoid endless
recursion, when handling code-in-comments formatting.

vim/after/syntax/cplusplus.vim

@@ -0,0 +1,15 @@
+
+" This enables Basic C++ support, with my extensions.
+if version < 600
+  so <sfile>:p:h/cpp.vim
+else
+  runtime! syntax/cpp.vim
+endif
+
+" This enables doxygen simultaneous with C++.
+if version < 600
+  so <sfile>:p:h/doxygen.vim
+else
+  runtime! syntax/doxygen.vim
+endif
+

vim/after/syntax/cpp.vim

@@ -1,12 +1,5 @@
 " ADAM C++ vim syntax after extensions
 
-" This enables doxygen simultaneous with C++.
-if version < 600
-  so <sfile>:p:h/doxygen.vim
-else
-  runtime! syntax/doxygen.vim
-endif
-
 syn match cxxObjects           "\<[A-Z][A-Za-z0-9_]*[a-z][A-Za-z0-9_]*\>"
 syn match cxxMetaFunction      "\<[a-z][a-z0-9]*_[a-z0-9_]*[a-z0-9]\>"
 

vim/filetype.vim

@@ -0,0 +1,35 @@
+" Cynlib
+" .cc and .cpp files can be C++ or Cynlib.
+au BufNewFile,BufRead *.cc
+	\ if exists("cynlib_syntax_for_cc")|setf cynlib|else|setf cplusplus|endif
+au BufNewFile,BufRead *.cpp
+	\ if exists("cynlib_syntax_for_cpp")|setf cynlib|else|setf cplusplus|endif
+
+" C++
+au BufNewFile,BufRead *.cxx,*.c++,*.hh,*.hxx,*.hpp,*.ipp,*.moc,*.tcc,*.inl setf cplusplus
+if has("fname_case")
+  au BufNewFile,BufRead *.C,*.H setf cplusplus
+endif
+
+function! CheckForADAM()
+  if match(getline(1, min([line("$"), 200])), '^@\(interface\|end\|class\)') > -1
+    if exists("g:c_syntax_for_h")
+      setf objc
+    else
+      setf objcpp
+    endif
+  elseif exists("g:c_syntax_for_h")
+    setf c
+  elseif exists("g:ch_syntax_for_h")
+    setf ch
+  else
+    setf cplusplus
+  endif
+endfunction
+
+" .h files can be C, Ch C++, ObjC or ObjC++.
+" Set c_syntax_for_h if you want C, ch_syntax_for_h if you want Ch. ObjC is
+" detected automatically.
+au BufNewFile,BufRead *.h			setf cplusplus "call CheckForADAM()
+au BufNewFile,BufRead		*.cxx,*.cpp,*.hpp,*.cc,*.h		setf cplusplus
+

vim/vimrc.fileprefs

@@ -5,7 +5,7 @@ au BufNewFile,BufRead		*.tex		map _ {!}fmt -p -s -w 70
 au BufNewFile,BufRead		*.tex			set textwidth=78
 au BufNewFile,BufRead		*.java			set tabstop=4
 au BufNewFile,BufRead		*.java			set shiftwidth=4
-au BufNewFile,BufRead		*.cpp,*.hpp,*.cc,*.h		setf cpp
+"au BufNewFile,BufRead		*.cpp,*.hpp,*.cc,*.h		setf cpp
 
 " Alephaish
 au BufNewFile,BufRead		*.cpp,*.hpp,*.cc,*.h		set sw=4