/usr/share/vim/vim80/syntax/ist.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | " Vim syntax file
" Language: Makeindex style file, *.ist
" Maintainer: Peter Meszaros <pmeszaros@effice.hu>
" Last Change: 2012 Jan 08 by Thilo Six
" quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
setlocal iskeyword=$,@,48-57,_
syn case ignore
syn keyword IstInpSpec actual arg_close arg_open encap escape
syn keyword IstInpSpec keyword level quote range_close range_open
syn keyword IstInpSpec page_compositor
syn keyword IstOutSpec preamble postamble setpage_prefix setpage_suffix group_skip
syn keyword IstOutSpec headings_flag heading_prefix heading_suffix
syn keyword IstOutSpec lethead_flag lethead_prefix lethead_suffix
syn keyword IstOutSpec symhead_positive symhead_negative numhead_positive numhead_negative
syn keyword IstOutSpec item_0 item_1 item_2 item_01
syn keyword IstOutSpec item_x1 item_12 item_x2
syn keyword IstOutSpec delim_0 delim_1 delim_2
syn keyword IstOutSpec delim_n delim_r delim_t
syn keyword IstOutSpec encap_prefix encap_infix encap_suffix
syn keyword IstOutSpec line_max indent_space indent_length
syn keyword IstOutSpec suffix_2p suffix_3p suffix_mp
syn region IstString matchgroup=IstDoubleQuote start=+"+ skip=+\\"+ end=+"+ contains=IstSpecial
syn match IstCharacter "'.'"
syn match IstNumber "\d\+"
syn match IstComment "^[\t ]*%.*$" contains=IstTodo
syn match IstSpecial "\\\\\|{\|}\|#\|\\n" contained
syn match IstTodo "DEBUG\|TODO" contained
" Define the default highlighting.
" Only when an item doesn't have highlighting yet
hi def link IstInpSpec Type
hi def link IstOutSpec Identifier
hi def link IstString String
hi def link IstNumber Number
hi def link IstComment Comment
hi def link IstTodo Todo
hi def link IstSpecial Special
hi def link IstDoubleQuote Label
hi def link IstCharacter Label
let b:current_syntax = "ist"
let &cpo = s:cpo_save
unlet s:cpo_save
" vim: ts=8 sw=2
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