" Vim syntax file
" Language:	C-shell (csh)
" Maintainer:	Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
" Last Change:	Oct 23, 2014
" Version:	11
" URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_CSH

" quit when a syntax file was already loaded
if exists("b:current_syntax")
  finish
endif

" clusters:
syn cluster cshQuoteList	contains=cshDblQuote,cshSnglQuote,cshBckQuote
syn cluster cshVarList	contains=cshExtVar,cshSelector,cshQtyWord,cshArgv,cshSubst

" Variables which affect the csh itself
syn match cshSetVariables	contained "argv\|histchars\|ignoreeof\|noglob\|prompt\|status"
syn match cshSetVariables	contained "cdpath\|history\|mail\|nonomatch\|savehist\|time"
syn match cshSetVariables	contained "cwd\|home\|noclobber\|path\|shell\|verbose"
syn match cshSetVariables	contained "echo"

syn case ignore
syn keyword cshTodo	contained todo
syn case match

" Variable Name Expansion Modifiers
syn match cshModifier	contained ":\(h\|t\|r\|q\|x\|gh\|gt\|gr\)"

" Strings and Comments
syn match   cshNoEndlineDQ	contained "[^\"]\(\\\\\)*$"
syn match   cshNoEndlineSQ	contained "[^\']\(\\\\\)*$"
syn match   cshNoEndlineBQ	contained "[^\`]\(\\\\\)*$"

syn region  cshDblQuote	start=+[^\\]"+lc=1 skip=+\\\\\|\\"+ end=+"+	contains=cshSpecial,cshShellVariables,cshExtVar,cshSelector,cshQtyWord,cshArgv,cshSubst,cshNoEndlineDQ,cshBckQuote,@Spell
syn region  cshSnglQuote	start=+[^\\]'+lc=1 skip=+\\\\\|\\'+ end=+'+	contains=cshNoEndlineSQ,@Spell
syn region  cshBckQuote	start=+[^\\]`+lc=1 skip=+\\\\\|\\`+ end=+`+	contains=cshNoEndlineBQ,@Spell
syn region  cshDblQuote	start=+^"+ skip=+\\\\\|\\"+ end=+"+		contains=cshSpecial,cshExtVar,cshSelector,cshQtyWord,cshArgv,cshSubst,cshNoEndlineDQ,@Spell
syn region  cshSnglQuote	start=+^'+ skip=+\\\\\|\\'+ end=+'+		contains=cshNoEndlineSQ,@Spell
syn region  cshBckQuote	start=+^`+ skip=+\\\\\|\\`+ end=+`+		contains=cshNoEndlineBQ,@Spell
syn cluster cshCommentGroup	contains=cshTodo,@Spell
syn match   cshComment	"#.*$" contains=@cshCommentGroup

" A bunch of useful csh keywords
syn keyword cshStatement	alias	end	history	onintr	setenv	unalias
syn keyword cshStatement	cd	eval	kill	popd	shift	unhash
syn keyword cshStatement	chdir	exec	login	pushd	source
syn keyword cshStatement	continue	exit	logout	rehash	time	unsetenv
syn keyword cshStatement	dirs	glob	nice	repeat	umask	wait
syn keyword cshStatement	echo	goto	nohup

syn keyword cshConditional	break	case	else	endsw	switch
syn keyword cshConditional	breaksw	default	endif
syn keyword cshRepeat	foreach

" Special environment variables
syn keyword cshShellVariables	HOME	LOGNAME	PATH	TERM	USER

" Modifiable Variables without {}
syn match cshExtVar	"\$[a-zA-Z_][a-zA-Z0-9_]*\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\="		contains=cshModifier
syn match cshSelector	"\$[a-zA-Z_][a-zA-Z0-9_]*\[[a-zA-Z_]\+\]\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\="	contains=cshModifier
syn match cshQtyWord	"\$#[a-zA-Z_][a-zA-Z0-9_]*\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\="		contains=cshModifier
syn match cshArgv		"\$\d\+\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\="			contains=cshModifier
syn match cshArgv		"\$\*\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\="			contains=cshModifier

" Modifiable Variables with {}
syn match cshExtVar	"\${[a-zA-Z_][a-zA-Z0-9_]*\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\=}"		contains=cshModifier
syn match cshSelector	"\${[a-zA-Z_][a-zA-Z0-9_]*\[[a-zA-Z_]\+\]\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\=}"	contains=cshModifier
syn match cshQtyWord	"\${#[a-zA-Z_][a-zA-Z0-9_]*\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\=}"		contains=cshModifier
syn match cshArgv		"\${\d\+\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\=}"			contains=cshModifier

" UnModifiable Substitutions
syn match cshSubstError	"\$?[a-zA-Z_][a-zA-Z0-9_]*:\(h\|t\|r\|q\|x\|gh\|gt\|gr\)"
syn match cshSubstError	"\${?[a-zA-Z_][a-zA-Z0-9_]*:\(h\|t\|r\|q\|x\|gh\|gt\|gr\)}"
syn match cshSubstError	"\$?[0$<]:\(h\|t\|r\|q\|x\|gh\|gt\|gr\)"
syn match cshSubst	"\$?[a-zA-Z_][a-zA-Z0-9_]*"
syn match cshSubst	"\${?[a-zA-Z_][a-zA-Z0-9_]*}"
syn match cshSubst	"\$?[0$<]"

" I/O redirection
syn match cshRedir	">>&!\|>&!\|>>&\|>>!\|>&\|>!\|>>\|<<\|>\|<"

" Handle set expressions
syn region  cshSetExpr	matchgroup=cshSetStmt start="\<set\>\|\<unset\>" end="$\|;" contains=cshComment,cshSetStmt,cshSetVariables,@cshQuoteList

" Operators and Expression-Using constructs
"syn match   cshOperator	contained "&&\|!\~\|!=\|<<\|<=\|==\|=\~\|>=\|>>\|\*\|\^\|\~\|||\|!\|\|%\|&\|+\|-\|/\|<\|>\||"
syn match   cshOperator	contained "&&\|!\~\|!=\|<<\|<=\|==\|=\~\|>=\|>>\|\*\|\^\|\~\|||\|!\|%\|&\|+\|-\|/\|<\|>\||"
syn match   cshOperator	contained "[(){}]"
syn region  cshTest	matchgroup=cshStatement start="\<if\>\|\<while\>" skip="\\$" matchgroup=cshStatement end="\<then\>\|$" contains=cshComment,cshOperator,@cshQuoteList,@cshVarLIst

" Highlight special characters (those which have a backslash) differently
syn match cshSpecial	contained "\\\d\d\d\|\\[abcfnrtv\\]"
syn match cshNumber	"-\=\<\d\+\>"

" All other identifiers
"syn match cshIdentifier	"\<[a-zA-Z._][a-zA-Z0-9._]*\>"

" Shell Input Redirection (Here Documents)
syn region cshHereDoc matchgroup=cshRedir start="<<-\=\s*\**\z(\h\w*\)\**" matchgroup=cshRedir end="^\z1$"

" Define the default highlighting.
" Only when an item doesn't have highlighting yet
command -nargs=+ HiLink hi def link <args>

HiLink cshArgv		cshVariables
HiLink cshBckQuote	cshCommand
HiLink cshDblQuote	cshString
HiLink cshExtVar	cshVariables
HiLink cshHereDoc	cshString
HiLink cshNoEndlineBQ	cshNoEndline
HiLink cshNoEndlineDQ	cshNoEndline
HiLink cshNoEndlineSQ	cshNoEndline
HiLink cshQtyWord	cshVariables
HiLink cshRedir		cshOperator
HiLink cshSelector	cshVariables
HiLink cshSetStmt	cshStatement
HiLink cshSetVariables	cshVariables
HiLink cshSnglQuote	cshString
HiLink cshSubst		cshVariables

HiLink cshCommand	Statement
HiLink cshComment	Comment
HiLink cshConditional	Conditional
HiLink cshIdentifier	Error
HiLink cshModifier	Special
HiLink cshNoEndline	Error
HiLink cshNumber	Number
HiLink cshOperator	Operator
HiLink cshRedir		Statement
HiLink cshRepeat	Repeat
HiLink cshShellVariables	Special
HiLink cshSpecial	Special
HiLink cshStatement	Statement
HiLink cshString	String
HiLink cshSubstError	Error
HiLink cshTodo		Todo
HiLink cshVariables	Type

delcommand HiLink

let b:current_syntax = "csh"

" vim: ts=18