Add syntax files from upstream vim repository

syntax/plp.vim

@@ -0,0 +1,41 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim syntax file
+" Language:	PLP (Perl in HTML)
+" Maintainer:	Juerd <juerd@juerd.nl>
+" Last Change:	2003 Apr 25
+" Cloned From:	aspperl.vim
+
+" Add to filetype.vim the following line (without quote sign):
+" au BufNewFile,BufRead *.plp setf plp
+
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
+  finish
+endif
+
+if !exists("main_syntax")
+  let main_syntax = 'perlscript'
+endif
+
+runtime! syntax/html.vim
+unlet b:current_syntax
+syn include @PLPperl syntax/perl.vim
+
+syn cluster htmlPreproc add=PLPperlblock
+
+syn keyword perlControl PLP_END
+syn keyword perlStatementInclude include Include
+syn keyword perlStatementFiles ReadFile WriteFile Counter
+syn keyword perlStatementScalar Entity AutoURL DecodeURI EncodeURI
+
+syn cluster PLPperlcode contains=perlStatement.*,perlFunction,perlOperator,perlVarPlain,perlVarNotInMatches,perlShellCommand,perlFloat,perlNumber,perlStringUnexpanded,perlString,perlQQ,perlControl,perlConditional,perlRepeat,perlComment,perlPOD,perlHereDoc,perlPackageDecl,perlElseIfError,perlFiledescRead,perlMatch
+
+syn region  PLPperlblock keepend matchgroup=Delimiter start=+<:=\=+ end=+:>+ transparent contains=@PLPperlcode
+
+syn region  PLPinclude keepend matchgroup=Delimiter start=+<(+ end=+)>+
+
+let b:current_syntax = "plp"
+
+
+endif