/usr/share/vim/addons/syntax/notmuch-show.vim is in notmuch-vim 0.17-3.
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 | " notmuch show mode syntax file
syntax cluster nmShowMsgDesc contains=nmShowMsgDescWho,nmShowMsgDescDate,nmShowMsgDescTags
syntax match nmShowMsgDescWho /[^)]\+)/ contained
syntax match nmShowMsgDescDate / ([^)]\+[0-9]) / contained
syntax match nmShowMsgDescTags /([^)]\+)$/ contained
syntax cluster nmShowMsgHead contains=nmShowMsgHeadKey,nmShowMsgHeadVal
syntax match nmShowMsgHeadKey /^[^:]\+: / contained
syntax match nmShowMsgHeadVal /^\([^:]\+: \)\@<=.*/ contained
syntax cluster nmShowMsgBody contains=@nmShowMsgBodyMail,@nmShowMsgBodyGit
syntax include @nmShowMsgBodyMail syntax/mail.vim
silent! syntax include @nmShowMsgBodyGit syntax/notmuch-git-diff.vim
highlight nmShowMsgDescWho term=reverse cterm=reverse gui=reverse
highlight link nmShowMsgDescDate Type
highlight link nmShowMsgDescTags String
highlight link nmShowMsgHeadKey Macro
"highlight link nmShowMsgHeadVal NONE
highlight Folded term=reverse ctermfg=LightGrey ctermbg=Black guifg=LightGray guibg=Black
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