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 keyword cshTodo contained TODO
" 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 "[^\`]\(\\\\\)*$"
syn region cshDblQuote start=+[^\\]"+lc=1 skip=+\\\\\|\\"+ end=+"+ contains=cshSpecial,cshShellVariables,cshExtVar,cshSelector,cshQtyWord,cshArgv,cshSubst,cshNoEndlineDQ,cshBckQuote
syn region cshSnglQuote start=+[^\\]'+lc=1 skip=+\\\\\|\\'+ end=+'+ contains=cshNoEndlineSQ
syn region cshBckQuote start=+[^\\]`+lc=1 skip=+\\\\\|\\`+ end=+`+ contains=cshNoEndlineBQ
syn region cshDblQuote start=+^"+ skip=+\\\\\|\\"+ end=+"+ contains=cshSpecial,cshExtVar,cshSelector,cshQtyWord,cshArgv,cshSubst,cshNoEndlineDQ
syn region cshSnglQuote start=+^'+ skip=+\\\\\|\\'+ end=+'+ contains=cshNoEndlineSQ
syn region cshBckQuote start=+^`+ skip=+\\\\\|\\`+ end=+`+ contains=cshNoEndlineBQ
syn match cshComment "#.*$" contains=cshTodo
" 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 "\$[0-9]\+\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\=" 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 "\${[0-9]\+\(:h\|:t\|:r\|:q\|:x\|:gh\|:gt\|:gr\)\=}" 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$<]"
" I/O redirection
syn match cshRedir ">>&!\|>&!\|>>&\|>>!\|>&\|>!\|>>\|<<\|>\|<"
" Handle set expressions
syn keyword cshSetStmt contained set unset
syn region cshSetExpr transparent start="set\|unset" end="$\|;" contains=cshSetVariables,cshDblQuote,cshSnglQuote,cshBckQuote,cshSetStmt
" Operators and Expression-Using constructs
syn keyword cshExprUsing contained if while exit then
syn match cshOperator contained "\(&&\|!\~\|!=\|<<\|<=\|==\|=\~\|>=\|>>\|\*\|\^\|\~\|||\|!\|\|%\|&\|+\|-\|/\|<\|>\||\)"
syn match cshOperator contained "[(){}]"
syn region cshTest transparent start="if\|while\|exit" skip="\\$" end="$\|;\|then" contains=cshOperator,cshExprUsing
" Highlight special characters (those which have a backslash) differently
syn match cshSpecial contained "\\[0-9][0-9][0-9]\|\\[abcfnrtv\\]"
syn match cshNumber "-\=\<[0-9]\+\>"
" All other identifiers
"syn match cshIdentifier "\<[a-zA-Z._][a-zA-Z0-9._]*\>"
if !exists("did_csh_syntax_inits")
let did_csh_syntax_inits = 1
" The default methods for highlighting. Can be overridden later
hi link cshArgv cshVariables
hi link cshBckQuote cshCommand
hi link cshDblQuote cshString
hi link cshExprUsing cshStatement
hi link cshExtVar cshVariables
hi link cshNoEndlineBQ cshNoEndline
hi link cshNoEndlineDQ cshNoEndline
hi link cshNoEndlineSQ cshNoEndline
hi link cshQtyWord cshVariables
hi link cshSelector cshVariables
hi link cshSetStmt cshStatement
hi link cshSetVariables cshVariables
hi link cshSnglQuote cshString
hi link cshSubst cshVariables
hi link cshCommand Statement
hi link cshComment Comment
hi link cshConditional Conditional
" hi link cshIdentifier Identifier
hi link cshIdentifier Error
hi link cshModifier Special
hi link cshNoEndline Error
hi link cshNumber Number
hi link cshRedir Statement
hi link cshRepeat Repeat
hi link cshShellVariables Special
hi link cshSpecial Special
hi link cshStatement Statement
hi link cshString String
hi link cshSubstError Error
hi link cshTodo Todo
hi link cshVariables Type
hi cshOperator term=bold cterm=NONE gui=NONE gui=bold guifg=purple cterm=bold ctermfg=5
