add xonsh syntax highlighting

.vim/ftdetect/xonsh.vim

@@ -0,0 +1,2 @@
+au BufNewFile,BufRead .xonshrc set filetype=xonsh
+au BufNewFile,BufRead *.xsh set filetype=xonsh

.vim/syntax/xonsh.vim

@@ -0,0 +1,152 @@
+" Vim syntax file for xonsh
+" Language: Xonsh Shell Script
+" Maintainer: Abhishek Mukherjee
+" Latest Revision: 05 January 2016
+
+
+if exists("b:current_syntax")
+  finish
+endif
+
+if exists("xsh_highlight_all")
+  let xsh_highlight_numbers = 1
+  let xsh_highlight_builtins = 1
+  let xsh_highlight_exceptions = 1
+  let xsh_highlight_space_errors = 1
+endif
+
+syn keyword xshStatement    as assert break continue del except exec finally
+syn keyword xshStatement    global lambda pass print raise return try with
+syn keyword xshStatement    yield
+syn match xshEnvironmentVariable "\v\$[a-zA-Z0-9_]+"
+
+syn keyword xshStatement    def class nextgroup=xshFunction skipwhite
+
+syn match xshFunction    "[a-zA-Z_][a-zA-Z0-9_]*" contained
+
+syn keyword xshRepeat    for while
+
+syn keyword xshConditional    if elif else
+
+syn keyword xshOperator    and in is not or
+
+syn keyword xshPreCondit    import from
+
+syn match xshComment    "#.*$" contains=xshTodo
+
+syn keyword xshTodo    TODO FIXME XXX contained
+
+syn region xshString    matchgroup=Normal start=+[uU]\='+ end=+'+ skip=+\\\\\|\\'+ contains=xshEscape
+syn region xshString    matchgroup=Normal start=+[uU]\="+ end=+"+ skip=+\\\\\|\\"+ contains=xshEscape
+syn region xshString    matchgroup=Normal start=+[uU]\="""+ end=+"""+  contains=xshEscape
+syn region xshString    matchgroup=Normal start=+[uU]\='''+ end=+'''+  contains=xshEscape
+syn region xshString    matchgroup=Normal start=+[uU]\=[rR]'+ end=+'+ skip=+\\\\\|\\'+ 
+syn region xshString    matchgroup=Normal start=+[uU]\=[rR]"+ end=+"+ skip=+\\\\\|\\"+ 
+syn region xshString    matchgroup=Normal start=+[uU]\=[rR]"""+ end=+"""+  
+syn region xshString    matchgroup=Normal start=+[uU]\=[rR]'''+ end=+'''+  
+
+syn match xshEscape    +\\[abfnrtv\'"\\]+ contained
+syn match xshEscape    "\\\o\{1,3}" contained
+syn match xshEscape    "\\x\x\{2}" contained
+syn match xshEscape    "\(\\u\x\{4}\|\\U\x\{8}\)" contained
+
+syn match xshEscape    "\\$"
+
+
+if exists("xsh_highlight_numbers")
+  syn match xshNumber    "\<0x\x\+[Ll]\=\>"
+  syn match xshNumber    "\<\d\+[LljJ]\=\>"
+  syn match xshNumber    "\.\d\+\([eE][+-]\=\d\+\)\=[jJ]\=\>"
+  syn match xshNumber    "\<\d\+\.\([eE][+-]\=\d\+\)\=[jJ]\=\>"
+  syn match xshNumber    "\<\d\+\.\d\+\([eE][+-]\=\d\+\)\=[jJ]\=\>"
+
+endif
+
+
+if exists("xsh_highlight_builtins")
+  syn keyword xshBuiltin    Ellipsis False None NotImplemented True __debug__
+  syn keyword xshBuiltin    __import__ abs all any apply basestring bin bool
+  syn keyword xshBuiltin    buffer bytearray bytes callable chr classmethod
+  syn keyword xshBuiltin    cmp coerce compile complex copyright credits
+  syn keyword xshBuiltin    delattr dict dir divmod enumerate eval execfile
+  syn keyword xshBuiltin    exit file filter float format frozenset getattr
+  syn keyword xshBuiltin    globals hasattr hash help hex id input int intern
+  syn keyword xshBuiltin    isinstance issubclass iter len license list
+  syn keyword xshBuiltin    locals long map max memoryview min next object
+  syn keyword xshBuiltin    oct open ord pow print property quit range
+  syn keyword xshBuiltin    raw_input reduce reload repr reversed round set
+  syn keyword xshBuiltin    setattr slice sorted staticmethod str sum super
+  syn keyword xshBuiltin    tuple type unichr unicode vars xrange zip
+
+endif
+
+
+if exists("xsh_highlight_exceptions")
+  syn keyword xshException    ArithmeticError AssertionError AttributeError
+  syn keyword xshException    BaseException BufferError BytesWarning
+  syn keyword xshException    DeprecationWarning EOFError EnvironmentError
+  syn keyword xshException    Exception FloatingPointError FutureWarning
+  syn keyword xshException    GeneratorExit IOError ImportError ImportWarning
+  syn keyword xshException    IndentationError IndexError KeyError
+  syn keyword xshException    KeyboardInterrupt LookupError MemoryError
+  syn keyword xshException    NameError NotImplementedError OSError
+  syn keyword xshException    OverflowError PendingDeprecationWarning
+  syn keyword xshException    ReferenceError RuntimeError RuntimeWarning
+  syn keyword xshException    StandardError StopIteration SyntaxError
+  syn keyword xshException    SyntaxWarning SystemError SystemExit TabError
+  syn keyword xshException    TypeError UnboundLocalError UnicodeDecodeError
+  syn keyword xshException    UnicodeEncodeError UnicodeError
+  syn keyword xshException    UnicodeTranslateError UnicodeWarning
+  syn keyword xshException    UserWarning ValueError Warning
+  syn keyword xshException    ZeroDivisionError
+
+endif
+
+
+if exists("xsh_highlight_space_errors")
+  syn match xshSpaceError    display excludenl "\S\s\+$"ms=s+1
+  syn match xshSpaceError    display " \+\t"
+  syn match xshSpaceError    display "\t\+ "
+
+endif
+
+
+  hi def link xshStatement Statement
+  hi def link xshStatement Statement
+  hi def link xshFunction Function
+  hi def link xshRepeat Repeat
+  hi def link xshConditional Conditional
+  hi def link xshOperator Operator
+  hi def link xshPreCondit PreCondit
+  hi def link xshComment Comment
+  hi def link xshTodo Todo
+  hi def link xshString String
+  hi def link xshEscape Special
+  hi def link xshEscape Special
+
+  if exists("xsh_highlight_numbers")
+    hi def link xshNumber Number
+  endif
+  hi def link xshEnvironmentVariable Number
+
+  if exists("xsh_highlight_builtins")
+    hi def link xshBuiltin Function
+  endif
+
+  if exists("xsh_highlight_exceptions")
+    hi def link xshException Exception
+  endif
+
+  if exists("xsh_highlight_space_errors")
+    hi def link xshSpaceError Error
+  endif
+
+
+" Uncomment the 'minlines' statement line and comment out the 'maxlines'
+" statement line; changes behaviour to look at least 2000 lines previously for
+" syntax matches instead of at most 200 lines
+syn sync match xshSync grouphere NONE "):$"
+syn sync maxlines=200
+"syn sync minlines=2000
+
+let b:current_syntax = "xsh"