[patch] introduce python_no_python{2,3}_builtin_highlight to syntax/python.vim

[Eisuke Kawashima]

Dear all and Mr. Zvezdan Petkovic,

I introduce python_no_python{2,3}_builtin_highlight to avoid highlighting the 
buitlins only in Python 2/3, like c_no_c99 in syntax/c.vim.
The variable names are lengthy, though.

Best Regards,
--
Eisuke Kawashima

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diff --git a/runtime/syntax/python.vim b/runtime/syntax/python.vim
index 23666a1..1c38fc9 100644
--- a/runtime/syntax/python.vim
+++ b/runtime/syntax/python.vim
@@ -210,13 +210,19 @@ if !exists("python_no_builtin_highlight")
   syn keyword pythonBuiltin	setattr slice sorted staticmethod str
   syn keyword pythonBuiltin	sum super tuple type vars zip __import__
   " Python 2 only
-  syn keyword pythonBuiltin	basestring cmp execfile file
-  syn keyword pythonBuiltin	long raw_input reduce reload unichr
-  syn keyword pythonBuiltin	unicode xrange
+  if !exists("python_no_python2_builtin_highlight")
+    syn keyword pythonBuiltin	basestring cmp execfile file
+    syn keyword pythonBuiltin	long raw_input reduce reload unichr
+    syn keyword pythonBuiltin	unicode xrange
+  endif
   " Python 3 only
-  syn keyword pythonBuiltin	ascii bytes exec
+  if !exists("python_no_python3_builtin_highlight")
+    syn keyword pythonBuiltin	ascii bytes exec
+  endif
   " non-essential built-in functions; Python 2 only
-  syn keyword pythonBuiltin	apply buffer coerce intern
+  if !exists("python_no_python2_builtin_highlight")
+    syn keyword pythonBuiltin	apply buffer coerce intern
+  endif
   " avoid highlighting attributes as builtins
   syn match   pythonAttribute	/\.\h\w*/hs=s+1
 	\ contains=ALLBUT,pythonBuiltin,pythonFunction,pythonAsync
@@ -232,7 +238,9 @@ if !exists("python_no_exception_highlight")
   syn keyword pythonExceptions	ArithmeticError BufferError
   syn keyword pythonExceptions	LookupError
   " builtin base exceptions removed in Python 3
-  syn keyword pythonExceptions	EnvironmentError StandardError
+  if !exists("python_no_python2_builtin_highlight")
+    syn keyword pythonExceptions	EnvironmentError StandardError
+  endif
   " builtin exceptions (actually raised)
   syn keyword pythonExceptions	AssertionError AttributeError
   syn keyword pythonExceptions	EOFError FloatingPointError GeneratorExit
@@ -247,24 +255,30 @@ if !exists("python_no_exception_highlight")
   syn keyword pythonExceptions	UnicodeTranslateError ValueError
   syn keyword pythonExceptions	ZeroDivisionError
   " builtin OS exceptions in Python 3
-  syn keyword pythonExceptions	BlockingIOError BrokenPipeError
-  syn keyword pythonExceptions	ChildProcessError ConnectionAbortedError
-  syn keyword pythonExceptions	ConnectionError ConnectionRefusedError
-  syn keyword pythonExceptions	ConnectionResetError FileExistsError
-  syn keyword pythonExceptions	FileNotFoundError InterruptedError
-  syn keyword pythonExceptions	IsADirectoryError NotADirectoryError
-  syn keyword pythonExceptions	PermissionError ProcessLookupError
-  syn keyword pythonExceptions	RecursionError StopAsyncIteration
-  syn keyword pythonExceptions	TimeoutError
+  if !exists("python_no_python3_builtin_highlight")
+    syn keyword pythonExceptions	BlockingIOError BrokenPipeError
+    syn keyword pythonExceptions	ChildProcessError ConnectionAbortedError
+    syn keyword pythonExceptions	ConnectionError ConnectionRefusedError
+    syn keyword pythonExceptions	ConnectionResetError FileExistsError
+    syn keyword pythonExceptions	FileNotFoundError InterruptedError
+    syn keyword pythonExceptions	IsADirectoryError NotADirectoryError
+    syn keyword pythonExceptions	PermissionError ProcessLookupError
+    syn keyword pythonExceptions	RecursionError StopAsyncIteration
+    syn keyword pythonExceptions	TimeoutError
+  endif
   " builtin exceptions deprecated/removed in Python 3
-  syn keyword pythonExceptions	IOError VMSError WindowsError
+  if !exists("python_no_python2_builtin_highlight")
+    syn keyword pythonExceptions	IOError VMSError WindowsError
+  endif
   " builtin warnings
   syn keyword pythonExceptions	BytesWarning DeprecationWarning FutureWarning
   syn keyword pythonExceptions	ImportWarning PendingDeprecationWarning
   syn keyword pythonExceptions	RuntimeWarning SyntaxWarning UnicodeWarning
   syn keyword pythonExceptions	UserWarning Warning
   " builtin warnings in Python 3
-  syn keyword pythonExceptions	ResourceWarning
+  if !exists("python_no_python3_builtin_highlight")
+    syn keyword pythonExceptions	ResourceWarning
+  endif
 endif
 
 if exists("python_space_error_highlight")