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" Vim syntax file
" Language:	C-shell (csh)
" Maintainer:	Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
" Last Change:	Aug 31, 2016
" Version:	13
" 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

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.
if !exists("skip_csh_syntax_inits")

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

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

endif

let b:current_syntax = "csh"

" vim: ts=18

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