General improvements and additions (#1)

* Don't hightlight end in the middle of a word

* Highlight operators

* highlight periods

* Highlight function parentheses

- Also combined operators and used correct highlight colors

* Highlight braces

* Prepend #@ to newlines if previous line had it

* Highlight yttStatement in pink

- Also fixes end highlighting

* fix based on vint

autoload/ytt.vim

@@ -4,6 +4,14 @@
 let s:save_cpo = &cpo
 set cpo&vim
 
+function! YttEnter()
+  if getline('.') =~# '^#@.*$'
+    return "\<Esc>o#@ "
+  else
+    return "\<CR>"
+  endif
+endfunction
+
 function! ytt#enable()
   if exists(':ALEDisable') != 0
     :ALEDisable
@@ -20,19 +28,28 @@ function! ytt#enable()
 
   syn match yttConditional "if/end" contains=starlarkConditional contained
   syn match yttRepeat "for/end" contains=starlarkRepeat contained
-  syn match yttEnd "end" contained
+  syn match yttEnd "\<end\>" contained
   syn match yttSpecial "#@" contained
+  syn match yttOperator "[+|=|!|:|\.]" contained
+  syn match yttFunction "[A-Za-z_]*(" contained
+  syn match yttFunction "[)|,]" contained
+  syn match yttBlock "[{|}]" contained
 
   hi def link yttConditional Conditional
   hi def link yttRepeat Repeat
   hi def link yttEnd Statement
   hi def link yttSpecial Special
+  hi def link yttOperator Operator
+  hi def link yttFunction Function
+  hi def link yttBlock Operator
 
   syn region yttStatement start="#@" end="$"
-        \ contains=starlarkStatement,starlarkConditional,starlarkRepeat,starlarkOperator,starlarkType,starlarkBuitin,starlarkInclude,starlarkBlock,starlarkParen,starlarkString,,yttSpecial,yttConditional,yttRepeat,yttEnd
-  hi def link yttStatement Comment
+        \ contains=starlarkStatement,starlarkConditional,starlarkRepeat,starlarkOperator,starlarkType,starlarkBuitin,starlarkInclude,starlarkBlock,starlarkParen,starlarkString,,yttSpecial,yttConditional,yttRepeat,yttEnd,yttOperator,yttFunction,yttBlock
+  highlight yttStatement guifg=Pink
 
   syn sync minlines=500
+
+  imap <expr> <CR> YttEnter()
 endfunction
 
 function! ytt#disable()