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" Vim syntax file
" Language: Mail file
" Previous Maintainer: Felix von Leitner <leitner@math.fu-berlin.de>
" Maintainer: GI <a@b.c>, where a='gi1242+vim', b='gmail', c='com'
" Last Change: Thu 25 Jan 2024 10:34:02 AM EST
" Quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
syn spell toplevel
" The mail header is recognized starting with a "keyword:" line and ending
" with an empty line or other line that can't be in the header. All lines of
" the header are highlighted. Headers of quoted messages (quoted with >) are
" also highlighted.
" Syntax clusters
syn cluster mailHeaderFields contains=mailHeaderKey,mailSubject,mailHeaderEmail,@mailLinks
syn cluster mailLinks contains=mailURL,mailEmail
syn cluster mailQuoteExps contains=mailQuoteExp1,mailQuoteExp2,mailQuoteExp3,mailQuoteExp4,mailQuoteExp5,mailQuoteExp6
syn case match
" For "From " matching case is required. The "From " is not matched in quoted
" emails
" According to RFC 2822 any printable ASCII character can appear in a field
" name, except ':'.
syn region mailHeader contains=@mailHeaderFields,@NoSpell start="^From .*\d\d\d\d$" skip="^\s" end="\v^[!-9;-~]*([^!-~]|$)"me=s-1 fold
syn match mailHeaderKey contained contains=mailEmail,@NoSpell "^From\s.*\d\d\d\d$"
" Nothing else depends on case.
syn case ignore
" Headers in properly quoted (with "> " or ">") emails are matched
syn region mailHeader keepend contains=@mailHeaderFields,@mailQuoteExps,@NoSpell start="^\z(\(> \?\)*\)\v(newsgroups|x-([a-z\-])*|path|xref|message-id|from|((in-)?reply-)?to|b?cc|subject|return-path|received|date|replied):" skip="^\z1\s" end="\v^\z1[!-9;-~]*([^!-~]|$)"me=s-1 end="\v^\z1@!"me=s-1 end="\v^\z1(\> ?)+"me=s-1 fold
" Usenet headers
syn match mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@NoSpell "\v(^(\> ?)*)@<=(Newsgroups|Followup-To|Message-ID|Supersedes|Control):.*$"
syn region mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@mailQuoteExps,@NoSpell start="\v(^(\> ?)*)@<=(to|b?cc):" skip=",$" end="$"
syn match mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@NoSpell "\v(^(\> ?)*)@<=(from|reply-to):.*$" fold
syn match mailHeaderKey contained contains=@NoSpell "\v(^(\> ?)*)@<=date:"
syn match mailSubject contained "\v^subject:.*$" fold
syn match mailSubject contained contains=@NoSpell "\v(^(\> ?)+)@<=subject:.*$"
" Anything in the header between < and > is an email address
syn match mailHeaderEmail contained contains=@NoSpell "<.\{-}>"
" Mail Signatures. (Begin with "-- ", end with change in quote level)
syn region mailSignature keepend contains=@mailLinks,@mailQuoteExps start="^--\s$" end="^$" end="^\(> \?\)\+"me=s-1 fold
syn region mailSignature keepend contains=@mailLinks,@mailQuoteExps,@NoSpell start="^\z(\(> \?\)\+\)--\s$" end="^\z1$" end="^\z1\@!"me=s-1 end="^\z1\(> \?\)\+"me=s-1 fold
" Treat verbatim Text special.
syn region mailVerbatim contains=@NoSpell keepend start="^#v+$" end="^#v-$" fold
syn region mailVerbatim contains=@mailQuoteExps,@NoSpell keepend start="^\z(\(> \?\)\+\)#v+$" end="\z1#v-$" fold
" URLs start with a known protocol or www,web,w3.
syn match mailURL contains=@NoSpell `\v<(((https?|ftp|gopher)://|(mailto|file|news):)[^' <>"]+|(www|web|w3)[a-z0-9_-]*\.[a-z0-9._-]+\.[^' <>"]+)[a-z0-9/]`
syn match mailEmail contains=@NoSpell "\v[_=a-z\./+0-9-]+\@[a-z0-9._-]+\a{2}"
" Don't spell emojis
syn match mailEmoji contains=@NoSpell "\%#=2\v[\U1f300-\U1f64f\U1f900-\U1f9ff]"
" Make sure quote markers in regions (header / signature) have correct color
syn match mailQuoteExp1 contained "\v^(\> ?)"
syn match mailQuoteExp2 contained "\v^(\> ?){2}"
syn match mailQuoteExp3 contained "\v^(\> ?){3}"
syn match mailQuoteExp4 contained "\v^(\> ?){4}"
syn match mailQuoteExp5 contained "\v^(\> ?){5}"
syn match mailQuoteExp6 contained "\v^(\> ?){6}"
" Even and odd quoted lines. Order is important here!
syn region mailQuoted6 keepend contains=mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{5}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
syn region mailQuoted5 keepend contains=mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{4}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
syn region mailQuoted4 keepend contains=mailQuoted5,mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{3}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
syn region mailQuoted3 keepend contains=mailQuoted4,mailQuoted5,mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{2}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
syn region mailQuoted2 keepend contains=mailQuoted3,mailQuoted4,mailQuoted5,mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{1}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
syn region mailQuoted1 keepend contains=mailQuoted2,mailQuoted3,mailQuoted4,mailQuoted5,mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z([a-z]\+>\|[]|}>]\)" end="^\z1\@!" fold
" Need to sync on the header. Assume we can do that within 100 lines
if exists("mail_minlines")
exec "syn sync minlines=" . mail_minlines
else
syn sync minlines=100
endif
" Define the default highlighting.
hi def link mailVerbatim Special
hi def link mailHeader PreProc
hi def link mailHeaderKey Type
hi def link mailSignature Comment
hi def link mailHeaderEmail mailEmail
hi def link mailEmail String
hi def link mailURL Constant
hi def link mailSubject Statement
hi def link mailQuoted1 Function
hi def link mailQuoted3 mailQuoted1
hi def link mailQuoted5 mailQuoted1
hi def link mailQuoted2 Identifier
hi def link mailQuoted4 mailQuoted2
hi def link mailQuoted6 mailQuoted2
hi def link mailQuoteExp1 mailQuoted1
hi def link mailQuoteExp2 mailQuoted2
hi def link mailQuoteExp3 mailQuoted3
hi def link mailQuoteExp4 mailQuoted4
hi def link mailQuoteExp5 mailQuoted5
hi def link mailQuoteExp6 mailQuoted6
let b:current_syntax = "mail"
let &cpo = s:cpo_save
unlet s:cpo_save
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