Update runtime files.
diff --git a/runtime/syntax/awk.vim b/runtime/syntax/awk.vim
index f80a582..40491ee 100644
--- a/runtime/syntax/awk.vim
+++ b/runtime/syntax/awk.vim
@@ -1,13 +1,15 @@
" Vim syntax file
" Language: awk, nawk, gawk, mawk
" Maintainer: Antonio Colombo <azc100@gmail.com>
-" Last Change: 2012 May 18
+" Last Change: 2014 Oct 21
" AWK ref. is: Alfred V. Aho, Brian W. Kernighan, Peter J. Weinberger
" The AWK Programming Language, Addison-Wesley, 1988
" GAWK ref. is: Arnold D. Robbins
" Effective AWK Programming, Third Edition, O'Reilly, 2001
+" Effective AWK Programming, Fourth Edition, O'Reilly, 2015
+" (also available with the gawk source distribution)
" MAWK is a "new awk" meaning it implements AWK ref.
" mawk conforms to the Posix 1003.2 (draft 11.3)
@@ -33,17 +35,27 @@
syn keyword awkStatement break continue delete exit
syn keyword awkStatement function getline next
syn keyword awkStatement print printf return
-" GAWK ref. p. 117
+" GAWK ref. Chapter 7
syn keyword awkStatement nextfile
-" AWK ref. p. 42, GAWK ref. p. 142-166
-syn keyword awkFunction atan2 close cos exp fflush int log rand sin sqrt srand
-syn keyword awkFunction gsub index length match split sprintf sub
-syn keyword awkFunction substr system
-" GAWK ref. p. 142-166
-syn keyword awkFunction asort gensub mktime strftime strtonum systime
+"
+" GAWK ref. Chapter 9, Functions
+"
+" Numeric Functions
+syn keyword awkFunction atan2 cos div exp int log rand sin sqrt srand
+" String Manipulation Functions
+syn keyword awkFunction asort asort1 gensub gsub index length match
+syn keyword awkFunction patsplit split sprintf strtonum sub substr
syn keyword awkFunction tolower toupper
-syn keyword awkFunction and or xor compl lshift rshift
-syn keyword awkFunction dcgettext bindtextdomain
+" Input Output Functions
+syn keyword awkFunction close fflush system
+" Time Functions
+syn keyword awkFunction mktime strftime systime
+" Bit Manipulation Functions
+syn keyword awkFunction and compl lshift or rshift xor
+" Getting Type Function
+syn keyword awkFunction isarray
+" String-Translation Functions
+syn keyword awkFunction bindtextdomain dcgettext dcngetext
syn keyword awkConditional if else
syn keyword awkRepeat while for
@@ -51,13 +63,16 @@
syn keyword awkTodo contained TODO
syn keyword awkPatterns BEGIN END
-" AWK ref. p. 36
-syn keyword awkVariables ARGC ARGV FILENAME FNR FS NF NR
-syn keyword awkVariables OFMT OFS ORS RLENGTH RS RSTART SUBSEP
-" GAWK ref. p. 120-126
-syn keyword awkVariables ARGIND BINMODE CONVFMT ENVIRON ERRNO
-syn keyword awkVariables FIELDWIDTHS IGNORECASE LINT PROCINFO
-syn keyword awkVariables RT RLENGTH TEXTDOMAIN
+
+" GAWK ref. Chapter 7
+" Built-in Variables That Control awk
+syn keyword awkVariables BINMODE CONVFMT FIELDWIDTHS FPAT FS
+syn keyword awkVariables IGNORECASE LINT OFMT OFS ORS PREC
+syn keyword awkVariables ROUNDMODE RS SUBSEP TEXTDOMAIN
+" Built-in Variables That Convey Information
+syn keyword awkVariables ARGC ARGV ARGIND ENVIRON ERRNO FILENAME
+syn keyword awkVariables FNR NF FUNCTAB NR PROCINFO RLENGTH RSTART
+syn keyword awkVariables RT SYMTAB
syn keyword awkRepeat do
@@ -115,15 +130,15 @@
"syn match awkIdentifier "\<[a-zA-Z_][a-zA-Z0-9_]*\>"
" Arithmetic operators: +, and - take care of ++, and --
-"syn match awkOperator "+\|-\|\*\|/\|%\|="
-"syn match awkOperator "+=\|-=\|\*=\|/=\|%="
-"syn match awkOperator "^\|^="
+syn match awkOperator "+\|-\|\*\|/\|%\|="
+syn match awkOperator "+=\|-=\|\*=\|/=\|%="
+syn match awkOperator "^\|^="
" Comparison expressions.
-"syn match awkExpression "==\|>=\|=>\|<=\|=<\|\!="
-"syn match awkExpression "\~\|\!\~"
-"syn match awkExpression "?\|:"
-"syn keyword awkExpression in
+syn match awkExpression "==\|>=\|=>\|<=\|=<\|\!="
+syn match awkExpression "\~\|\!\~"
+syn match awkExpression "?\|:"
+syn keyword awkExpression in
" Boolean Logic (OR, AND, NOT)
"syn match awkBoolLogic "||\|&&\|\!"
@@ -187,8 +202,8 @@
HiLink awkFloat Float
HiLink awkFileIO Special
- "HiLink awkOperator Special
- "HiLink awkExpression Special
+ HiLink awkOperator Special
+ HiLink awkExpression Special
HiLink awkBoolLogic Special
HiLink awkPatterns Special