Add caddyfile support, closes #195

syntax/caddyfile.vim

@@ -0,0 +1,33 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'caddyfile') == -1
+  
+" Language: Caddyfile
+" Author:   Josh Glendenning <josh@isobit.io>
+
+if exists("b:current_syntax")
+	finish
+endif
+
+syn match caddyDirective "^\s*\([a-z]\+\)" nextgroup=caddyDirectiveArgs skipwhite
+syn region caddyDirectiveArgs start="" end="\({\|#\|$\)"me=s-1 oneline contained contains=caddyPlaceholder,caddyString nextgroup=caddyDirectiveBlock skipwhite
+syn region caddyDirectiveBlock start="{" skip="\\}" end="}" contained contains=caddySubdirective,caddyComment
+
+syn match caddySubdirective "^\s*\([a-zA-Z0-9_]\+\)" contained nextgroup=caddySubdirectiveArgs skipwhite
+syn region caddySubdirectiveArgs start="" end="\(#\|$\)"me=s-1 oneline contained contains=caddyPlaceholder,caddyString
+
+syn match caddyHost "\(https\?:\/\/\)\?\(\(\w\{1,}\.\)\(\w\{2,}\.\?\)\+\|localhost\)\(:[0-9]\{1,5}\)\?" nextgroup=caddyHostBlock skipwhite
+syn region caddyHostBlock start="{" skip="\\}" end="}" contained contains=caddyDirective,caddyComment
+
+syn region caddyPlaceholder start="{" skip="\\}" end="}" oneline contained
+syn region caddyString start='"' skip='\\\\\|\\"' end='"' oneline
+syn match caddyComment "#.*$"
+
+hi link caddyDirective Keyword
+hi link caddySubdirective Structure
+hi link caddyHost Identifier
+hi link caddyPlaceholder Special
+hi link caddyString String
+hi link caddyComment Comment
+
+let b:current_syntax = "caddyfile"
+
+endif