diff --git a/runtime/syntax/gnuplot.vim b/runtime/syntax/gnuplot.vim
index 5a381c7..03d813c 100644
--- a/runtime/syntax/gnuplot.vim
+++ b/runtime/syntax/gnuplot.vim
@@ -1,176 +1,505 @@
 " Vim syntax file
-" Language:	gnuplot 3.8i.0
-" Maintainer:	John Hoelzel johnh51@users.sourceforge.net
-" Last Change:	Mon May 26 02:33:33 UTC 2003
-" Filenames:	*.gpi  *.gih   scripts: #!*gnuplot
-" URL:		http://johnh51.get.to/vim/syntax/gnuplot.vim
-"
+" Language:	gnuplot 4.7.0
+" Maintainer:	Andrew Rasmussen andyras@users.sourceforge.net
+" Original Maintainer:	John Hoelzel johnh51@users.sourceforge.net
+" Last Change:	2014-02-24
+" Filenames:	*.gnu *.plt *.gpi *.gih *.gp *.gnuplot scripts: #!*gnuplot
+" URL:		http://www.vim.org/scripts/script.php?script_id=4873
+" Original URL:	http://johnh51.get.to/vim/syntax/gnuplot.vim
 
-" thanks to "David Necas (Yeti)" <yeti@physics.muni.cz> for heads up - working on more changes .
-" *.gpi      = GnuPlot Input - what I use because there is no other guideline. jeh 11/2000
-" *.gih      = makes using cut/pasting from gnuplot.gih easier ...
-" #!*gnuplot = for Linux bash shell scripts of gnuplot commands.
-"	       emacs used a suffix of '<gp?>'
-" gnuplot demo files show no preference.
-" I will post mail and newsgroup comments on a standard suffix in 'URL' directory.
+" thanks to "David Necas (Yeti)" <yeti@physics.muni.cz>
 
-" For version 5.x: Clear all syntax items
-" For version 6.x: Quit when a syntax file was already loaded
+" credit also to Jim Eberle <jim.eberle@fastnlight.com>
+" for the script http://www.vim.org/scripts/script.php?script_id=1737
+
+" some shortened names to make demo files look clean... jeh. 11/2000
+" demos -> 3.8i ... jeh. 5/2003 - a work in progress...
+" added current commands, keywords, variables, todos, macros... amr 2014-02-24
+
+" For vim version 5.x: Clear all syntax items
+" For vim version 6.x: Quit when a syntax file was already loaded
+
 if version < 600
   syntax clear
 elseif exists("b:current_syntax")
   finish
 endif
 
-" some shortened names to make demo files look clean... jeh. 11/2000
-" demos -> 3.8i ... jeh. 5/2003 - a work in progress...
+" ---- Special characters ---- "
 
-" commands
+" no harm in just matching any \[char] within double quotes, right?
+syn match gnuplotSpecial	"\\." contained
+" syn match gnuplotSpecial	"\\\o\o\o\|\\x\x\x\|\\c[^"]\|\\[a-z\\]" contained
 
-syn keyword gnuplotStatement	cd call clear exit set unset plot splot help
-syn keyword gnuplotStatement	load pause quit fit rep[lot] if
-syn keyword gnuplotStatement	FIT_LIMIT FIT_MAXITER FIT_START_LAMBDA
-syn keyword gnuplotStatement	FIT_LAMBDA_FACTOR FIT_LOG FIT_SCRIPT
-syn keyword gnuplotStatement	print pwd reread reset save show test ! functions var
-syn keyword gnuplotConditional	if
-" if is cond + stmt - ok?
+" measurements in the units in, cm and pt are special
+syn match gnuplotUnit		"[0-9]+in"
+syn match gnuplotUnit		"[0-9]+cm"
+syn match gnuplotUnit		"[0-9]+pt"
 
-" numbers fm c.vim
+" external (shell) commands are special
+syn region gnuplotExternal	start="!" end="$"
 
-"	integer number, or floating point number without a dot and with "f".
+" ---- Comments ---- "
+
+syn region gnuplotComment	start="#" end="$" contains=gnuplotTodo
+
+" ---- Constants ---- "
+
+" strings
+syn region gnuplotString	start=+"+ skip=+\\"+ end=+"+ contains=gnuplotSpecial
+syn region gnuplotString	start="'" end="'"
+
+" built-in variables
+syn keyword gnuplotNumber	GNUTERM GPVAL_TERM GPVAL_TERMOPTIONS GPVAL_SPLOT
+syn keyword gnuplotNumber	GPVAL_OUTPUT GPVAL_ENCODING GPVAL_VERSION
+syn keyword gnuplotNumber	GPVAL_PATCHLEVEL GPVAL_COMPILE_OPTIONS
+syn keyword gnuplotNumber	GPVAL_MULTIPLOT GPVAL_PLOT GPVAL_VIEW_ZSCALE
+syn keyword gnuplotNumber	GPVAL_TERMINALS GPVAL_pi GPVAL_NaN
+syn keyword gnuplotNumber	GPVAL_ERRNO GPVAL_ERRMSG GPVAL_PWD
+syn keyword gnuplotNumber	pi NaN GPVAL_LAST_PLOT GPVAL_TERM_WINDOWID
+syn keyword gnuplotNumber	GPVAL_X_MIN GPVAL_X_MAX GPVAL_X_LOG
+syn keyword gnuplotNumber	GPVAL_DATA_X_MIN GPVAL_DATA_X_MAX GPVAL_Y_MIN
+syn keyword gnuplotNumber	GPVAL_Y_MAX GPVAL_Y_LOG GPVAL_DATA_Y_MIN
+syn keyword gnuplotNumber	GPVAL_DATA_Y_MAX GPVAL_X2_MIN GPVAL_X2_MAX
+syn keyword gnuplotNumber	GPVAL_X2_LOG GPVAL_DATA_X2_MIN GPVAL_DATA_X2_MAX
+syn keyword gnuplotNumber	GPVAL_Y2_MIN GPVAL_Y2_MAX GPVAL_Y2_LOG
+syn keyword gnuplotNumber	GPVAL_DATA_Y2_MIN GPVAL_DATA_Y2_MAX GPVAL_Z_MIN
+syn keyword gnuplotNumber	GPVAL_Z_MAX GPVAL_Z_LOG GPVAL_DATA_Z_MIN
+syn keyword gnuplotNumber	GPVAL_DATA_Z_MAX GPVAL_CB_MIN GPVAL_CB_MAX
+syn keyword gnuplotNumber	GPVAL_CB_LOG GPVAL_DATA_CB_MIN GPVAL_DATA_CB_MAX
+syn keyword gnuplotNumber	GPVAL_T_MIN GPVAL_T_MAX GPVAL_T_LOG GPVAL_U_MIN
+syn keyword gnuplotNumber	GPVAL_U_MAX GPVAL_U_LOG GPVAL_V_MIN GPVAL_V_MAX
+syn keyword gnuplotNumber	GPVAL_V_LOG GPVAL_R_MIN GPVAL_R_LOG
+syn keyword gnuplotNumber	GPVAL_TERM_XMIN GPVAL_TERM_XMAX GPVAL_TERM_YMIN
+syn keyword gnuplotNumber	GPVAL_TERM_YMAX GPVAL_TERM_XSIZE
+syn keyword gnuplotNumber	GPVAL_TERM_YSIZE GPVAL_VIEW_MAP GPVAL_VIEW_ROT_X
+syn keyword gnuplotNumber	GPVAL_VIEW_ROT_Z GPVAL_VIEW_SCALE
+
+" function name variables
+syn match gnuplotNumber		"GPFUN_[a-zA-Z_]*"
+
+" stats variables
+syn keyword gnuplotNumber	STATS_records STATS_outofrange STATS_invalid
+syn keyword gnuplotNumber	STATS_blank STATS_blocks STATS_columns STATS_min
+syn keyword gnuplotNumber	STATS_max STATS_index_min STATS_index_max
+syn keyword gnuplotNumber	STATS_lo_quartile STATS_median STATS_up_quartile
+syn keyword gnuplotNumber	STATS_mean STATS_stddev STATS_sum STATS_sumsq
+syn keyword gnuplotNumber	STATS_correlation STATS_slope STATS_intercept
+syn keyword gnuplotNumber	STATS_sumxy STATS_pos_min_y STATS_pos_max_y
+syn keyword gnuplotNumber	STATS_mean STATS_stddev STATS_mean_x STATS_sum_x
+syn keyword gnuplotNumber	STATS_stddev_x STATS_sumsq_x STATS_min_x
+syn keyword gnuplotNumber	STATS_max_x STATS_median_x STATS_lo_quartile_x
+syn keyword gnuplotNumber	STATS_up_quartile_x STATS_index_min_x
+syn keyword gnuplotNumber	STATS_index_max_x STATS_mean_y STATS_stddev_y
+syn keyword gnuplotNumber	STATS_sum_y STATS_sumsq_y STATS_min_y
+syn keyword gnuplotNumber	STATS_max_y STATS_median_y STATS_lo_quartile_y
+syn keyword gnuplotNumber	STATS_up_quartile_y STATS_index_min_y
+syn keyword gnuplotNumber	STATS_index_max_y STATS_correlation STATS_sumxy
+
+" deprecated fit variables
+syn keyword gnuplotError	FIT_LIMIT FIT_MAXITER FIT_START_LAMBDA
+syn keyword gnuplotError	FIT_LAMBDA_FACTOR FIT_LOG FIT_SCRIPT
+
+" numbers, from c.vim
+
+" integer number, or floating point number without a dot and with "f".
 syn case    ignore
 syn match   gnuplotNumber	"\<[0-9]\+\(u\=l\=\|lu\|f\)\>"
-"	floating point number, with dot, optional exponent
+
+" floating point number, with dot, optional exponent
 syn match   gnuplotFloat	"\<[0-9]\+\.[0-9]*\(e[-+]\=[0-9]\+\)\=[fl]\=\>"
-"	floating point number, starting with a dot, optional exponent
+
+" floating point number, starting with a dot, optional exponent
 syn match   gnuplotFloat	"\.[0-9]\+\(e[-+]\=[0-9]\+\)\=[fl]\=\>"
-"	floating point number, without dot, with exponent
+
+" floating point number, without dot, with exponent
 syn match   gnuplotFloat	"\<[0-9]\+e[-+]\=[0-9]\+[fl]\=\>"
-"	hex number
+
+" hex number
 syn match   gnuplotNumber	"\<0x[0-9a-f]\+\(u\=l\=\|lu\)\>"
 syn case    match
-"	flag an octal number with wrong digits by not hilighting
+
+" flag an octal number with wrong digits by not highlighting
 syn match   gnuplotOctalError	"\<0[0-7]*[89]"
 
-" plot args
+" ---- Identifiers: Functions ---- "
 
-syn keyword gnuplotType		u[sing] tit[le] notit[le] wi[th] steps fs[teps]
-syn keyword gnuplotType		title notitle t
-syn keyword gnuplotType		with w
-syn keyword gnuplotType		li[nes] l
-" t - too much?  w - too much?  l - too much?
-syn keyword gnuplotType		linespoints via
+" numerical functions
+syn keyword gnuplotFunc		abs acos acosh airy arg asin asinh atan atan2
+syn keyword gnuplotFunc		atanh EllipticK EllipticE EllipticPi besj0 besj1
+syn keyword gnuplotFunc		besy0 besy1 ceil cos cosh erf erfc exp expint
+syn keyword gnuplotFunc		floor gamma ibeta inverf igamma imag invnorm int
+syn keyword gnuplotFunc		lambertw lgamma log log10 norm rand real sgn sin
+syn keyword gnuplotFunc		sin sinh sqrt tan tanh voigt
 
-" funcs
+" string functions
+syn keyword gnuplotFunc		gprintf sprintf strlen strstrt substr strftime
+syn keyword gnuplotFunc		strptime system word words
 
-syn keyword gnuplotFunc		abs acos acosh arg asin asinh atan atanh atan2
-syn keyword gnuplotFunc		besj0 besj1 besy0 besy1
-syn keyword gnuplotFunc		ceil column cos cosh erf erfc exp floor gamma
-syn keyword gnuplotFunc		ibeta inverf igamma imag invnorm int lgamma
-syn keyword gnuplotFunc		log log10 norm rand real sgn sin sinh sqrt tan
-syn keyword gnuplotFunc		lambertw
-syn keyword gnuplotFunc		tanh valid
-syn keyword gnuplotFunc		tm_hour tm_mday tm_min tm_mon tm_sec
-syn keyword gnuplotFunc		tm_wday tm_yday tm_year
+" other functions
+syn keyword gnuplotFunc		column columnhead columnheader defined exists
+syn keyword gnuplotFunc		hsv2rgb stringcolumn timecolumn tm_hour tm_mday
+syn keyword gnuplotFunc		tm_min tm_mon tm_sec tm_wday tm_yday tm_year
+syn keyword gnuplotFunc		time valid value
 
-" set vars
+" ---- Statements ---- "
 
-syn keyword gnuplotType		xdata timefmt grid noytics ytics fs
-syn keyword gnuplotType		logscale time notime mxtics nomxtics style mcbtics
-syn keyword gnuplotType		nologscale
-syn keyword gnuplotType		axes x1y2 unique acs[plines]
-syn keyword gnuplotType		size origin multiplot xtics xr[ange] yr[ange] square nosquare ratio noratio
-syn keyword gnuplotType		binary matrix index every thru sm[ooth]
-syn keyword gnuplotType		all angles degrees radians
-syn keyword gnuplotType		arrow noarrow autoscale noautoscale arrowstyle
-" autoscale args = x y xy z t ymin ... - too much?
-" needs code to: using title vs autoscale t
-syn keyword gnuplotType		x y z zcb
-syn keyword gnuplotType		linear  cubicspline  bspline order level[s]
-syn keyword gnuplotType		auto disc[rete] incr[emental] from to head nohead
-syn keyword gnuplotType		graph base both nosurface table out[put] data
-syn keyword gnuplotType		bar border noborder boxwidth
-syn keyword gnuplotType		clabel noclabel clip noclip cntrp[aram]
-syn keyword gnuplotType		contour nocontour
-syn keyword gnuplotType		dgrid3d nodgrid3d dummy encoding format
-" set encoding args not included - yet.
-syn keyword gnuplotType		function grid nogrid hidden[3d] nohidden[3d] isosample[s] key nokey
-syn keyword gnuplotType		historysize nohistorysize
-syn keyword gnuplotType		defaults offset nooffset trianglepattern undefined noundefined altdiagonal bentover noaltdiagonal nobentover
-syn keyword gnuplotType		left right top bottom outside below samplen spacing width height box nobox linestyle ls linetype lt linewidth lw
-syn keyword gnuplotType		Left Right autotitles noautotitles enhanced noenhanced
-syn keyword gnuplotType		isosamples
-syn keyword gnuplotType		label nolabel logscale nolog[scale] missing center font locale
-syn keyword gnuplotType		mapping margin bmargin lmargin rmargin tmargin spherical cylindrical cartesian
-syn keyword gnuplotType		linestyle nolinestyle linetype lt linewidth lw pointtype pt pointsize ps
-syn keyword gnuplotType		mouse nomouse
-syn keyword gnuplotType		nooffsets data candlesticks financebars linespoints lp vector nosurface
-syn keyword gnuplotType		term[inal] linux aed767 aed512 gpic
-syn keyword gnuplotType		regis tek410x tek40 vttek kc-tek40xx
-syn keyword gnuplotType		km-tek40xx selanar bitgraph xlib x11 X11
-" x11 args
-syn keyword gnuplotType		aifm cgm dumb fig gif small large size nofontlist winword6 corel dxf emf
-syn keyword gnuplotType		hpgl
-" syn keyword gnuplotType	transparent hp2623a hp2648 hp500c pcl5				      why jeh
-syn keyword gnuplotType		hp2623a hp2648 hp500c pcl5
-syn match gnuplotType		"\<transparent\>"
-syn keyword gnuplotType		hpljii hpdj hppj imagen mif pbm png svg
-syn keyword gnuplotType		postscript enhanced_postscript qms table
-" postscript editing values?
-syn keyword gnuplotType		tgif tkcanvas epson-180dpi epson-60dpi
-syn keyword gnuplotType		epson-lx800 nec-cp6 okidata starc
-syn keyword gnuplotType		tandy-60dpi latex emtex pslatex pstex epslatex
-syn keyword gnuplotType		eepic tpic pstricks texdraw mf metafont mpost mp
-syn keyword gnuplotType		timestamp notimestamp
-syn keyword gnuplotType		variables version
-syn keyword gnuplotType		x2data y2data ydata zdata
-syn keyword gnuplotType		reverse writeback noreverse nowriteback
-syn keyword gnuplotType		axis mirror autofreq nomirror rotate autofreq norotate
-syn keyword gnuplotType		update
-syn keyword gnuplotType		multiplot nomultiplot mytics
-syn keyword gnuplotType		nomytics mztics nomztics mx2tics nomx2tics
-syn keyword gnuplotType		my2tics nomy2tics offsets origin output
-syn keyword gnuplotType		para[metric] nopara[metric] pointsize polar nopolar
-syn keyword gnuplotType		zrange x2range y2range rrange cbrange
-syn keyword gnuplotType		trange urange vrange sample[s] size
-syn keyword gnuplotType		bezier boxerrorbars boxes bargraph bar[s]
-syn keyword gnuplotType		boxxy[errorbars] csplines dots fsteps histeps impulses
-syn keyword gnuplotType		line[s] linesp[oints] points poiinttype sbezier splines steps
-" w lt lw ls	      = optional
-syn keyword gnuplotType		vectors xerr[orbars] xyerr[orbars] yerr[orbars] financebars candlesticks vector
-syn keyword gnuplotType		errorb[ars] surface
-syn keyword gnuplotType		filledcurve[s] pm3d   x1 x2 y1 y2 xy closed
-syn keyword gnuplotType		at pi front
-syn keyword gnuplotType		errorlines xerrorlines yerrorlines xyerrorlines
-syn keyword gnuplotType		tics ticslevel ticscale time timefmt view
-syn keyword gnuplotType		xdata xdtics noxdtics ydtics noydtics
-syn keyword gnuplotType		zdtics nozdtics x2dtics nox2dtics y2dtics noy2dtics
-syn keyword gnuplotType		xlab[el] ylab[el] zlab[el] cblab[el] x2label y2label xmtics
-syn keyword gnuplotType		xmtics noxmtics ymtics noymtics zmtics nozmtics
-syn keyword gnuplotType		x2mtics nox2mtics y2mtics noy2mtics
-syn keyword gnuplotType		cbdtics nocbdtics cbmtics nocbmtics cbtics nocbtics
-syn keyword gnuplotType		xtics noxtics ytics noytics
-syn keyword gnuplotType		ztics noztics x2tics nox2tics
-syn keyword gnuplotType		y2tics noy2tics zero nozero zeroaxis nozeroaxis
-syn keyword gnuplotType		xzeroaxis noxzeroaxis yzeroaxis noyzeroaxis
-syn keyword gnuplotType		x2zeroaxis nox2zeroaxis y2zeroaxis noy2zeroaxis
-syn keyword gnuplotType		angles one two fill empty solid pattern
-syn keyword gnuplotType		default
-syn keyword gnuplotType		scansautomatic flush b[egin] noftriangles implicit
-" b too much? - used in demo
-syn keyword gnuplotType		palette positive negative ps_allcF nops_allcF maxcolors
-syn keyword gnuplotType		push fontfile pop
-syn keyword gnuplotType		rgbformulae defined file color model gradient colornames
-syn keyword gnuplotType		RGB HSV CMY YIQ XYZ
-syn keyword gnuplotType		colorbox vertical horizontal user bdefault
-syn keyword gnuplotType		loadpath fontpath decimalsign in out
+" common (builtin) variable names
+syn keyword gnuplotKeyword	x y t u v z s
 
-" comments + strings
-syn region gnuplotComment	start="#" end="$"
-syn region gnuplotComment	start=+"+ skip=+\\"+ end=+"+
-syn region gnuplotComment	start=+'+	     end=+'+
+" conditionals
+syn keyword gnuplotConditional	if else
 
-" Define the default highlighting.
+" repeats
+syn keyword gnuplotRepeat	do for while
+
+" operators
+syn match gnuplotOperator	"[-+*/^|&?:]"
+syn match gnuplotOperator	"\*\*"
+syn match gnuplotOperator	"&&"
+syn match gnuplotOperator	"||"
+
+" Keywords
+
+" keywords for 'fit' command
+syn keyword gnuplotKeyword	via z x:z x:z:s x:y:z:s
+syn keyword gnuplotKeyword	x:y:t:z:s x:y:t:u:z:s x:y:t:u:v:z:s
+
+" keywords for 'plot' command
+" 'axes' keyword
+syn keyword gnuplotKeyword	axes x1y1 x1y2 x2y1 x2y2
+" 'binary' keyword
+syn keyword gnuplotKeyword	binary matrix general array record format endian
+syn keyword gnuplotKeyword	filetype avs edf png scan transpose dx dy dz
+syn keyword gnuplotKeyword	flipx flipy flipz origin center rotate using
+syn keyword gnuplotKeyword	perpendicular skip every
+" datafile keywords
+syn keyword gnuplotKeyword	binary nonuniform matrix index every using
+syn keyword gnuplotKeyword	smooth volatile noautoscale every index
+" 'smooth' keywords
+syn keyword gnuplotKeyword	unique frequency cumulative cnormal kdensity
+syn keyword gnuplotKeyword	csplines acsplines bezer sbezier
+" deprecated 'thru' keyword
+syn keyword gnuplotError	thru
+" 'using' keyword
+syn keyword gnuplotKeyword	using u xticlabels yticlabels zticlabels
+syn keyword gnuplotKeyword	x2ticlabels y2ticlabels xtic ytic ztic
+" 'errorbars' keywords
+syn keyword gnuplotKeyword	errorbars xerrorbars yerrorbars xyerrorbars
+" 'errorlines' keywords
+syn keyword gnuplotKeyword	errorlines xerrorlines yerrorlines xyerrorlines
+" 'title' keywords
+syn keyword gnuplotKeyword	title t tit notitle columnheader at beginning
+syn keyword gnuplotKeyword	end
+" 'with' keywords
+syn keyword gnuplotKeyword	with w linestyle ls linetype lt linewidth
+syn keyword gnuplotKeyword	lw linecolor lc pointtype pt pointsize ps
+syn keyword gnuplotKeyword	fill fs nohidden3d nocontours nosurface palette
+" styles for 'with'
+syn keyword gnuplotKeyword	lines l points p linespoints lp surface dots
+syn keyword gnuplotKeyword	impulses labels vectors steps fsteps histeps
+syn keyword gnuplotKeyword	errorbars errorlines financebars xerrorbars
+syn keyword gnuplotKeyword	xerrorlines xyerrorbars yerrorbars yerrorlines
+syn keyword gnuplotKeyword	boxes boxerrorbars boxxyerrorbars boxplot
+syn keyword gnuplotKeyword	candlesticks circles ellipses filledcurves
+syn keyword gnuplotKeyword	histogram image rgbimage rgbalpha pm3d variable
+
+" keywords for 'save' command
+syn keyword gnuplotKeyword	save functions func variables all var terminal
+syn keyword gnuplotKeyword	term set
+
+" keywords for 'set/show' command
+" set angles
+syn keyword gnuplotKeyword	angles degrees deg radians rad
+" set arrow
+syn keyword gnuplotKeyword	arrow from to rto length angle arrowstyle as
+syn keyword gnuplotKeyword	nohead head backhead heads size filled empty
+syn keyword gnuplotKeyword	nofilled front back linestyle linetype linewidth
+" set autoscale
+" TODO regexp here
+syn keyword gnuplotKeyword	autoscale x y z cb x2 y2 zy min max fixmin
+syn keyword gnuplotKeyword	fixmax fix keepfix noextend
+" set bars
+syn keyword gnuplotKeyword	bars small large fullwidth front back
+" set bind
+syn keyword gnuplotKeyword	bind
+" set margins
+" TODO regexp
+syn keyword gnuplotKeyword	margin bmargin lmargin rmargin tmargin
+" set border
+syn keyword gnuplotKeyword	border front back
+" set boxwidth
+syn keyword gnuplotKeyword	boxwidth absolute relative
+" deprecated set clabel
+syn keyword gnuplotError	clabel
+" set clip
+syn keyword gnuplotKeyword	clip points one two
+" set cntrlabel
+syn keyword gnuplotKeyword	cntrlabel format font start interval onecolor
+" set cntrparam
+syn keyword gnuplotKeyword	cntrparam linear cubicspline bspline points
+syn keyword gnuplotKeyword	order levels auto discrete incremental
+" set colorbox
+syn keyword gnuplotKeyword	colorbox vertical horizontal default user origin
+syn keyword gnuplotKeyword	size front back noborder bdefault border
+" show colornames
+syn keyword gnuplotKeyword	colornames
+" set contour
+syn keyword gnuplotKeyword	contour base surface both
+" set datafile
+syn keyword gnuplotKeyword	datafile fortran nofpe_trap missing separator
+syn keyword gnuplotKeyword	whitespace tab comma commentschars binary
+" set decimalsign
+syn keyword gnuplotKeyword	decimalsign locale
+" set dgrid3d
+syn keyword gnuplotKeyword	dgrid3d splines qnorm gauss cauchy exp box hann
+syn keyword gnuplotKeyword	kdensity
+" set dummy
+syn keyword gnuplotKeyword	dummy
+" set encoding
+syn keyword gnuplotKeyword	encoding default iso_8859_1 iso_8859_15
+syn keyword gnuplotKeyword	iso_8859_2 iso_8859_9 koi8r koi8u cp437 cp850
+syn keyword gnuplotKeyword	cp852 cp950 cp1250 cp1251 cp1254 sjis utf8
+" set fit
+syn keyword gnuplotKeyword	fit logfile default quiet noquiet results brief
+syn keyword gnuplotKeyword	verbose errorvariables noerrorvariables
+syn keyword gnuplotKeyword	errorscaling noerrorscaling prescale noprescale
+syn keyword gnuplotKeyword	maxiter none limit limit_abs start-lambda script
+syn keyword gnuplotKeyword	lambda-factor
+" set fontpath
+syn keyword gnuplotKeyword	fontpath
+" set format
+syn keyword gnuplotKeyword	format
+" show functions
+syn keyword gnuplotKeyword	functions
+" set grid
+syn keyword gnuplotKeyword	grid polar layerdefault xtics ytics ztics x2tics
+syn keyword gnuplotKeyword	y2tics cbtics mxtics mytics mztics mx2tics
+syn keyword gnuplotKeyword	my2tics mcbtics xmtics ymtics zmtics x2mtics
+syn keyword gnuplotKeyword	y2mtics cbmtics noxtics noytics noztics nox2tics
+syn keyword gnuplotKeyword	noy2tics nocbtics nomxtics nomytics nomztics
+syn keyword gnuplotKeyword	nomx2tics nomy2tics nomcbtics
+" set hidden3d
+syn keyword gnuplotKeyword	hidden3d offset trianglepattern undefined
+syn keyword gnuplotKeyword	altdiagonal noaltdiagonal bentover nobentover
+syn keyword gnuplotKeyword	noundefined
+" set historysize
+syn keyword gnuplotKeyword	historysize
+" set isosamples
+syn keyword gnuplotKeyword	isosamples
+" set key
+syn keyword gnuplotKeyword	key on off inside outside at left right center
+syn keyword gnuplotKeyword	top bottom vertical horizontal Left Right
+syn keyword gnuplotKeyword	opaque noopaque reverse noreverse invert maxrows
+syn keyword gnuplotKeyword	noinvert samplen spacing width height autotitle
+syn keyword gnuplotKeyword	noautotitle title enhanced noenhanced font
+syn keyword gnuplotKeyword	textcolor box nobox linetype linewidth maxcols
+" set label
+syn keyword gnuplotKeyword	label left center right rotate norotate by font
+syn keyword gnuplotKeyword	front back textcolor point nopoint offset boxed
+syn keyword gnuplotKeyword	hypertext
+" set linetype
+syn keyword gnuplotKeyword	linetype
+" set link
+syn keyword gnuplotKeyword	link via inverse
+" set loadpath
+syn keyword gnuplotKeyword	loadpath
+" set locale
+syn keyword gnuplotKeyword	locale
+" set logscale
+syn keyword gnuplotKeyword	logscale log
+" set macros
+syn keyword gnuplotKeyword	macros
+" set mapping
+syn keyword gnuplotKeyword	mapping cartesian spherical cylindrical
+" set mouse
+syn keyword gnuplotKeyword	mouse doubleclick nodoubleclick zoomcoordinates
+syn keyword gnuplotKeyword	nozoomcoordinates ruler noruler at polardistance
+syn keyword gnuplotKeyword	nopolardistance deg tan format clipboardformat
+syn keyword gnuplotKeyword	mouseformat labels nolabels zoomjump nozoomjump
+syn keyword gnuplotKeyword	verbose noverbose
+" set multiplot
+syn keyword gnuplotKeyword	multiplot title font layout rowsfirst downwards
+syn keyword gnuplotKeyword	downwards upwards scale offset
+" set object
+syn keyword gnuplotKeyword	object behind fillcolor fc fs rectangle ellipse
+syn keyword gnuplotKeyword	circle polygon at center size units xy xx yy to
+syn keyword gnuplotKeyword	from
+" set offsets
+syn keyword gnuplotKeyword	offsets
+" set origin
+syn keyword gnuplotKeyword	origin
+" set output
+syn keyword gnuplotKeyword	output
+" set parametric
+syn keyword gnuplotKeyword	parametric
+" show plot
+syn keyword gnuplotKeyword	plot add2history
+" set pm3d
+syn keyword gnuplotKeyword	hidden3d interpolate scansautomatic scansforward
+syn keyword gnuplotKeyword	scansbackward depthorder flush begin center end
+syn keyword gnuplotKeyword	ftriangles noftriangles clip1in clip4in mean map
+syn keyword gnuplotKeyword	corners2color geomean harmean rms median min max
+syn keyword gnuplotKeyword	c1 c2 c3 c4 pm3d at nohidden3d implicit explicit
+" set palette
+syn keyword gnuplotKeyword	palette gray color gamma rgbformulae defined
+syn keyword gnuplotKeyword	file functions cubehelix start cycles saturation
+syn keyword gnuplotKeyword	model RGB HSV CMY YIQ XYZ positive negative
+syn keyword gnuplotKeyword	nops_allcF ps_allcF maxcolors float int gradient
+syn keyword gnuplotKeyword	fit2rgbformulae rgbformulae
+" set pointintervalbox
+syn keyword gnuplotKeyword	pointintervalbox
+" set pointsize
+syn keyword gnuplotKeyword	pointsize
+" set polar
+syn keyword gnuplotKeyword	polar
+" set print
+syn keyword gnuplotKeyword	print append
+" set psdir
+syn keyword gnuplotKeyword	psdir
+" set raxis
+syn keyword gnuplotKeyword	raxis rrange rtics
+" set samples
+syn keyword gnuplotKeyword	samples
+" set size
+syn keyword gnuplotKeyword	size square nosquare ratio noratio
+" set style
+syn keyword gnuplotKeyword	style function data noborder rectangle arrow
+syn keyword gnuplotKeyword	default nohead head heads size filled empty
+syn keyword gnuplotKeyword	nofilled front back boxplot range fraction
+syn keyword gnuplotKeyword	outliers nooutliers pointtype candlesticks
+syn keyword gnuplotKeyword	separation labels off auto x x2 sorted unsorted
+syn keyword gnuplotKeyword	fill empty transparent solid pattern border
+syn keyword gnuplotKeyword	increment userstyles financebars line default
+syn keyword gnuplotKeyword	linetype lt linecolor lc linewidth lw pointtype
+syn keyword gnuplotKeyword	pt pointsize ps pointinterval pi palette circle
+syn keyword gnuplotKeyword	radius graph screen wedge nowedge ellipse size
+syn keyword gnuplotKeyword	units xx xy yy histogram line textbox opaque
+syn keyword gnuplotKeyword	border noborder
+" set surface
+syn keyword gnuplotKeyword	surface implicit explicit
+" set table
+syn keyword gnuplotKeyword	table
+" set terminal (list of terminals)
+syn keyword gnuplotKeyword	terminal term push pop aed512 aed767 aifm aqua
+syn keyword gnuplotKeyword	be cairo cairolatex canvas cgm context corel
+syn keyword gnuplotKeyword	debug dumb dxf dxy800a eepic emf emxvga epscairo
+syn keyword gnuplotKeyword	epslatex epson_180dpi excl fig ggi gif gpic hpgl
+syn keyword gnuplotKeyword	grass hp2623a hp2648 hp500c hpljii hppj imagen
+syn keyword gnuplotKeyword	jpeg kyo latex linux lua mf mif mp next openstep
+syn keyword gnuplotKeyword	pbm pdf pdfcairo pm png pngcairo postscript
+syn keyword gnuplotKeyword	pslatex pstex pstricks qms qt regis sun svg svga
+syn keyword gnuplotKeyword	tek40 tek410x texdraw tgif tikz tkcanvas tpic
+syn keyword gnuplotKeyword	vgagl vws vx384 windows wx wxt x11 xlib
+" keywords for 'set terminal'
+syn keyword gnuplotKeyword	color monochrome dashlength dl eps pdf fontscale
+syn keyword gnuplotKeyword	standalone blacktext colortext colourtext header
+syn keyword gnuplotKeyword	noheader mono color solid dashed notransparent
+syn keyword gnuplotKeyword	crop crop background input rounded butt square
+syn keyword gnuplotKeyword	size fsize standalone name jsdir defaultsize
+syn keyword gnuplotKeyword	timestamp notimestamp colour mitered beveled
+syn keyword gnuplotKeyword	round squared palfuncparam blacktext nec_cp6
+syn keyword gnuplotKeyword	mppoints inlineimages externalimages defaultfont
+syn keyword gnuplotKeyword	aspect feed nofeed rotate small tiny standalone
+syn keyword gnuplotKeyword	oldstyle newstyle level1 leveldefault level3
+syn keyword gnuplotKeyword	background nobackground solid clip noclip
+syn keyword gnuplotKeyword	colortext colourtext epson_60dpi epson_lx800
+syn keyword gnuplotKeyword	okidata starc tandy_60dpi dpu414 nec_cp6 draft
+syn keyword gnuplotKeyword	medium large normal landscape portrait big
+syn keyword gnuplotKeyword	inches pointsmax textspecial texthidden
+syn keyword gnuplotKeyword	thickness depth version acceleration giant
+syn keyword gnuplotKeyword	delay loop optimize nooptimize pspoints
+syn keyword gnuplotKeyword	FNT9X17 FNT13X25 interlace nointerlace courier
+syn keyword gnuplotKeyword	originreset nooriginreset gparrows nogparrows
+syn keyword gnuplotKeyword	picenvironment nopicenvironment tightboundingbox
+syn keyword gnuplotKeyword	notightboundingbox charsize gppoints nogppoints
+syn keyword gnuplotKeyword	fontscale textscale fulldoc nofulldoc standalone
+syn keyword gnuplotKeyword	preamble header tikzplot tikzarrows notikzarrows
+syn keyword gnuplotKeyword	cmykimages externalimages noexternalimages
+syn keyword gnuplotKeyword	polyline vectors magnification psnfss nopsnfss
+syn keyword gnuplotKeyword	psnfss-version7 prologues a4paper amstex fname
+syn keyword gnuplotKeyword	fsize server persist widelines interlace
+syn keyword gnuplotKeyword	truecolor notruecolor defaultplex simplex duplex
+syn keyword gnuplotKeyword	nofontfiles adobeglyphnames noadobeglyphnames
+syn keyword gnuplotKeyword	nostandalone metric textrigid animate nopspoints
+syn keyword gnuplotKeyword	hpdj FNT5X9 roman emtex rgbimages bitmap
+syn keyword gnuplotKeyword	nobitmap providevars nointerlace add delete
+syn keyword gnuplotKeyword	auxfile hacktext unit raise palfuncparam
+syn keyword gnuplotKeyword	noauxfile nohacktext nounit noraise ctrl noctrl
+syn keyword gnuplotKeyword	close widget fixed dynamic tek40xx vttek
+syn keyword gnuplotKeyword	kc-tek40xx km-tek40xx bitgraph perltk
+syn keyword gnuplotKeyword	interactive red green blue interpolate mode
+syn keyword gnuplotKeyword	position ctrlq replotonresize position noctrlq
+syn keyword gnuplotKeyword	noreplotonresize
+" set termoption
+syn keyword gnuplotKeyword	termoption font fontscale solid dashed
+" set tics
+syn keyword gnuplotKeyword	tics add axis border mirror nomirror in out
+syn keyword gnuplotKeyword	scale rotate norotate by offset nooffset left
+syn keyword gnuplotKeyword	autojustify format font textcolor right center
+" deprecated set ticslevel
+syn keyword gnuplotError	ticslevel ticscale
+" set timestamp
+syn keyword gnuplotKeyword	timestamp top bottom offset font
+" set timefmt
+syn keyword gnuplotKeyword	timefmt
+" set title
+syn keyword gnuplotKeyword	title offset font textcolor tc
+" set ranges
+syn keyword gnuplotKeyword	trange urange vrange
+" show variables
+syn keyword gnuplotKeyword	variables
+" show version
+syn keyword gnuplotKeyword	version
+" set view
+syn keyword gnuplotKeyword	view map equal noequal xy xyz
+" set x2data
+syn keyword gnuplotKeyword	xdata ydata zdata x2data y2data cbdata xdtics
+syn keyword gnuplotKeyword	ydtics zdtics x2dtics y2dtics cbdtics xzeroaxis
+syn keyword gnuplotKeyword	yzeroaxis zzeroaxis x2zeroaxis y2zeroaxis
+syn keyword gnuplotKeyword	cbzeroaxis time geographic
+" set label
+syn keyword gnuplotKeyword	xlabel ylabel zlabel x2label y2label cblabel
+syn keyword gnuplotKeyword	offset font textcolor by parallel
+" set range
+syn keyword gnuplotKeyword	xrange yrange zrange x2range y2range cbrange
+" set xyplane
+syn keyword gnuplotKeyword	xyplane
+" set zeroaxis
+" set zero
+syn keyword gnuplotKeyword	zero
+" set zeroaxis
+syn keyword gnuplotKeyword	zeroaxis
+
+" keywords for 'stats' command
+syn keyword gnuplotKeyword	nooutput
+
+" keywords for 'test' command
+syn keyword gnuplotKeyword	terminal palette rgb rbg grb gbr brg bgr
+
+" ---- Macros ---- "
+
+syn region gnuplotMacro		start="@" end=" "
+
+" ---- Todos ---- "
+
+syn keyword gnuplotTodo		contained TODO FIXME XXX
+
+" ---- Types: gnuplot commands ---- "
+
+" I set the commands as Types to distinguish them visually from keywords for the
+" commands.  This comes at the end of the syntax file because some commands
+" are redundant with keywords.  It's probably too much trouble to go and
+" create special regions for each redundant keyword/command pair, which means
+" that some keywords (e.g. 'p') will be highlighted as commands.
+
+syn keyword gnuplotStatement	cd call clear evaluate exit fit help history
+syn keyword gnuplotStatement	load lower pause plot p print pwd quit raise
+syn keyword gnuplotStatement	refresh replot rep reread reset save set show
+syn keyword gnuplotStatement	shell splot spstats system test undefine unset
+syn keyword gnuplotStatement	update
+
+" ---- Define the default highlighting ---- "
 " For version 5.7 and earlier: only when not done already
 " For version 5.8 and later: only when an item doesn't have highlighting yet
 if version >= 508 || !exists("did_gnuplot_syntax_inits")
@@ -181,14 +510,41 @@
     command -nargs=+ HiLink hi def link <args>
   endif
 
-  HiLink gnuplotStatement	Statement
-  HiLink gnuplotConditional	Conditional
+  " ---- Comments ---- "
+  HiLink gnuplotComment		Comment
+
+  " ---- Constants ---- "
+  HiLink gnuplotString		String
   HiLink gnuplotNumber		Number
   HiLink gnuplotFloat		Float
+
+  " ---- Identifiers ---- "
+  HiLink gnuplotIdentifier	Identifier
+
+  " ---- Statements ---- "
+  HiLink gnuplotConditional	Conditional
+  HiLink gnuplotRepeat		Repeat
+  HiLink gnuplotKeyword		Keyword
+  HiLink gnuplotOperator	Operator
+
+  " ---- PreProcs ---- "
+  HiLink gnuplotMacro		Macro
+
+  " ---- Types ---- "
+  HiLink gnuplotStatement	Type
+  HiLink gnuplotFunc		Identifier
+
+  " ---- Specials ---- "
+  HiLink gnuplotSpecial		Special
+  HiLink gnuplotUnit		Special
+  HiLink gnuplotExternal	Special
+
+  " ---- Errors ---- "
+  HiLink gnuplotError		Error
   HiLink gnuplotOctalError	Error
-  HiLink gnuplotFunc		Type
-  HiLink gnuplotType		Type
-  HiLink gnuplotComment	Comment
+
+  " ---- Todos ---- "
+  HiLink gnuplotTodo		Todo
 
   delcommand HiLink
 endif