Update runtime files

runtime/syntax/vdf.vim

@@ -0,0 +1,54 @@
+" Vim syntax file
+" Language:	Valve Data Format
+" Maintainer:	ObserverOfTime <chronobserver@disroot.org>
+" Filenames:	*.vdf
+" Last Change:	2022 Sep 15
+
+if exists('b:current_syntax')
+    finish
+endif
+
+let s:cpo_save = &cpoptions
+set cpoptions&vim
+
+" Comment
+syn keyword vdfTodo contained TODO FIXME XXX
+syn match vdfComment +//.*+ contains=vdfTodo
+
+" Macro
+syn match vdfMacro /^\s*#.*/
+
+" Tag
+syn region vdfTag start=/"/ skip=/\\"/ end=/"/
+            \ nextgroup=vdfValue skipwhite oneline
+
+" Section
+syn region vdfSection matchgroup=vdfBrace
+            \ start=/{/ end=/}/ transparent fold
+            \ contains=vdfTag,vdfSection,vdfComment,vdfConditional
+
+" Conditional
+syn match vdfConditional /\[\$\w\{1,1021}\]/ nextgroup=vdfTag
+
+" Value
+syn region vdfValue start=/"/ skip=/\\"/ end=/"/
+            \ oneline contained contains=vdfVariable,vdfNumber,vdfEscape
+syn region vdfVariable start=/%/ skip=/\\%/ end=/%/ oneline contained
+syn match vdfEscape /\\[nt\\"]/ contained
+syn match vdfNumber /"-\?\d\+"/ contained
+
+hi def link vdfBrace Delimiter
+hi def link vdfComment Comment
+hi def link vdfConditional Constant
+hi def link vdfEscape SpecialChar
+hi def link vdfMacro Macro
+hi def link vdfNumber Number
+hi def link vdfTag Keyword
+hi def link vdfTodo Todo
+hi def link vdfValue String
+hi def link vdfVariable Identifier
+
+let b:current_syntax = 'vdf'
+
+let &cpoptions = s:cpo_save
+unlet s:cpo_save