在 VIM (v7.2)\foo中加载默认语法方案后，如何突出显示一个特定 TeX 命令的所有实例？tex
如果没有预先加载语法方案，我可以轻松完成：
:syntax clear
:highlight myGroup ctermfg=blue
:syntax match myGroup "\\foo\>"
但是我不知道在tex加载语法方案时该怎么做。这不起作用：
:syntax clear
:set syntax=tex
:highlight myGroup ctermfg=blue
:syntax match myGroup "\\foo\>"
更新 1
实际上，它适用于序言中的命令，但不适用于document环境中的命令。
更新 2
一种解决方法是注释掉/usr/share/vim/vim72/syntax/tex.vim(v47) 中处理折叠的一些行：
" Sections, subsections, etc: {{{1
if g:tex_fold_enabled && has("folding")
syn region texDocZone matchgroup=texSection start='\\begin\s*{\s*document\s*}' end='\\end\s*{\s*document\s*}' fold contains=@texFoldGroup,@texDocGroup,@Spell
syn region texPartZone matchgroup=texSection start='\\part\>' end='\ze\s*\\\%(part\>\|end\s*{\s*document\s*}\)' fold contains=@texFoldGroup,@texPartGroup,@Spell
syn region texChapterZone matchgroup=texSection start='\\chapter\>' end='\ze\s*\\\%(chapter\>\|part\>\|end\s*{\s*document\s*}\)' fold contains=@texFoldGroup,@texChapterGroup,@Spell
syn region texSectionZone matchgroup=texSection start='\\section\>' end='\ze\s*\\\%(section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)' fold contains=@texFoldGroup,@texSectionGroup,@Spell
syn region texSubSectionZone matchgroup=texSection start='\\subsection\>' end='\ze\s*\\\%(\%(sub\)\=section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)' fold contains=@texFoldGroup,@texSubSectionGroup,@Spell
syn region texSubSubSectionZone matchgroup=texSection start='\\subsubsection\>' end='\ze\s*\\\%(\%(sub\)\{,2}section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'fold contains=@texFoldGroup,@texSubSubSectionGroup,@Spell
syn region texParaZone matchgroup=texSection start='\\paragraph\>' end='\ze\s*\\\%(paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)' fold contains=@texFoldGroup,@texParaGroup,@Spell
syn region texSubParaZone matchgroup=texSection start='\\subparagraph\>' end='\ze\s*\\\%(\%(sub\)\=paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)' fold contains=@texFoldGroup,@Spell
syn region texTitle matchgroup=texSection start='\\\%(author\|title\)\>\s*{' end='}' fold contains=@texFoldGroup,@Spell
syn region texAbstract matchgroup=texSection start='\\begin\s*{\s*abstract\s*}' end='\\end\s*{\s*abstract\s*}' fold contains=@texFoldGroup,@Spell
"else
" syn region texDocZone matchgroup=texSection start='\\begin\s*{\s*document\s*}' end='\\end\s*{\s*document\s*}' contains=@texFoldGroup,@texDocGroup,@Spell
" syn region texPartZone matchgroup=texSection start='\\part\>' end='\ze\s*\\\%(part\>\|end\s*{\s*document\s*}\)' contains=@texFoldGroup,@texPartGroup,@Spell
" syn region texChapterZone matchgroup=texSection start='\\chapter\>' end='\ze\s*\\\%(chapter\>\|part\>\|end\s*{\s*document\s*}\)' contains=@texFoldGroup,@texChapterGroup,@Spell
" syn region texSectionZone matchgroup=texSection start='\\section\>' end='\ze\s*\\\%(section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)' contains=@texFoldGroup,@texSectionGroup,@Spell
" syn region texSubSectionZone matchgroup=texSection start='\\subsection\>' end='\ze\s*\\\%(\%(sub\)\=section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)' contains=@texFoldGroup,@texSubSectionGroup,@Spell
" syn region texSubSubSectionZone matchgroup=texSection start='\\subsubsection\>' end='\ze\s*\\\%(\%(sub\)\{,2}section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'contains=@texFoldGroup,@texSubSubSectionGroup,@Spell
" syn region texParaZone matchgroup=texSection start='\\paragraph\>' end='\ze\s*\\\%(paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)' contains=@texFoldGroup,@texParaGroup,@Spell
" syn region texSubParaZone matchgroup=texSection start='\\subparagraph\>' end='\ze\s*\\\%(\%(sub\)\=paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)' contains=@texFoldGroup,@Spell
" syn region texTitle matchgroup=texSection start='\\\%(author\|title\)\>\s*{' end='}' contains=@texFoldGroup,@Spell
" syn region texAbstract matchgroup=texSection start='\\begin\s*{\s*abstract\s*}' end='\\end\s*{\s*abstract\s*}' contains=@texFoldGroup,@Spell
endif