3 " Previous Maintainer: Felix von Leitner <leitner@math.fu-berlin.de>
4 " Maintainer: Gautam Iyer <gi1242@users.sourceforge.net>
5 " Last Change: Thu 06 Nov 2008 10:10:55 PM PST
7 " Quit when a syntax file was already loaded
8 if exists("b:current_syntax")
12 " The mail header is recognized starting with a "keyword:" line and ending
13 " with an empty line or other line that can't be in the header. All lines of
14 " the header are highlighted. Headers of quoted messages (quoted with >) are
18 syn cluster mailHeaderFields contains=mailHeaderKey,mailSubject,mailHeaderEmail,@mailLinks
19 syn cluster mailLinks contains=mailURL,mailEmail
20 syn cluster mailQuoteExps contains=mailQuoteExp1,mailQuoteExp2,mailQuoteExp3,mailQuoteExp4,mailQuoteExp5,mailQuoteExp6
23 " For "From " matching case is required. The "From " is not matched in quoted
25 " According to RFC 2822 any printable ASCII character can appear in a field
27 syn region mailHeader contains=@mailHeaderFields,@NoSpell start="^From .*\d\d\d\d$" skip="^\s" end="\v^[!-9;-~]*([^!-~]|$)"me=s-1 fold
28 syn match mailHeaderKey contained contains=mailEmail,@NoSpell "^From\s.*\d\d\d\d$"
30 " Nothing else depends on case.
33 " Headers in properly quoted (with "> " or ">") emails are matched
34 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;-~]*([^!-~]|$)"me=s-1 end="\v^\z1@!"me=s-1 end="\v^\z1(\> ?)+"me=s-1 fold
37 syn match mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@NoSpell "\v(^(\> ?)*)@<=(Newsgroups|Followup-To|Message-ID|Supersedes|Control):.*$"
40 syn region mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@mailQuoteExps,@NoSpell start="\v(^(\> ?)*)@<=(to|b?cc):" skip=",$" end="$"
41 syn match mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@NoSpell "\v(^(\> ?)*)@<=(from|reply-to):.*$" fold
42 syn match mailHeaderKey contained contains=@NoSpell "\v(^(\> ?)*)@<=date:"
43 syn match mailSubject contained "\v^subject:.*$" fold
44 syn match mailSubject contained contains=@NoSpell "\v(^(\> ?)+)@<=subject:.*$"
46 " Anything in the header between < and > is an email address
47 syn match mailHeaderEmail contained contains=@NoSpell "<.\{-}>"
49 " Mail Signatures. (Begin with "-- ", end with change in quote level)
50 syn region mailSignature keepend contains=@mailLinks,@mailQuoteExps start="^--\s$" end="^$" end="^\(> \?\)\+"me=s-1 fold
51 syn region mailSignature keepend contains=@mailLinks,@mailQuoteExps,@NoSpell start="^\z(\(> \?\)\+\)--\s$" end="^\z1$" end="^\z1\@!"me=s-1 end="^\z1\(> \?\)\+"me=s-1 fold
53 " Treat verbatim Text special.
54 syn region mailVerbatim contains=@NoSpell keepend start="^#v+$" end="^#v-$" fold
55 syn region mailVerbatim contains=@mailQuoteExps,@NoSpell start="^\z(\(> \?\)\+\)#v+$" end="\z1#v-$" fold
57 " URLs start with a known protocol or www,web,w3.
58 syn match mailURL contains=@NoSpell `\v<(((https?|ftp|gopher)://|(mailto|file|news):)[^' <>"]+|(www|web|w3)[a-z0-9_-]*\.[a-z0-9._-]+\.[^' <>"]+)[a-z0-9/]`
59 syn match mailEmail contains=@NoSpell "\v[_=a-z\./+0-9-]+\@[a-z0-9._-]+\a{2}"
61 " Make sure quote markers in regions (header / signature) have correct color
62 syn match mailQuoteExp1 contained "\v^(\> ?)"
63 syn match mailQuoteExp2 contained "\v^(\> ?){2}"
64 syn match mailQuoteExp3 contained "\v^(\> ?){3}"
65 syn match mailQuoteExp4 contained "\v^(\> ?){4}"
66 syn match mailQuoteExp5 contained "\v^(\> ?){5}"
67 syn match mailQuoteExp6 contained "\v^(\> ?){6}"
69 " Even and odd quoted lines. Order is important here!
70 syn region mailQuoted6 keepend contains=mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{5}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
71 syn region mailQuoted5 keepend contains=mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{4}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
72 syn region mailQuoted4 keepend contains=mailQuoted5,mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{3}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
73 syn region mailQuoted3 keepend contains=mailQuoted4,mailQuoted5,mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z(\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{2}\([a-z]\+>\|[]|}>]\)\)" end="^\z1\@!" fold
74 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
75 syn region mailQuoted1 keepend contains=mailQuoted2,mailQuoted3,mailQuoted4,mailQuoted5,mailQuoted6,mailVerbatim,mailHeader,@mailLinks,mailSignature,@NoSpell start="^\z([a-z]\+>\|[]|}>]\)" end="^\z1\@!" fold
77 " Need to sync on the header. Assume we can do that within 100 lines
78 if exists("mail_minlines")
79 exec "syn sync minlines=" . mail_minlines
84 " Define the default highlighting.
85 hi def link mailVerbatim Special
86 hi def link mailHeader Statement
87 hi def link mailHeaderKey Type
88 hi def link mailSignature PreProc
89 hi def link mailHeaderEmail mailEmail
90 hi def link mailEmail Special
91 hi def link mailURL String
92 hi def link mailSubject LineNR
93 hi def link mailQuoted1 Comment
94 hi def link mailQuoted3 mailQuoted1
95 hi def link mailQuoted5 mailQuoted1
96 hi def link mailQuoted2 Identifier
97 hi def link mailQuoted4 mailQuoted2
98 hi def link mailQuoted6 mailQuoted2
99 hi def link mailQuoteExp1 mailQuoted1
100 hi def link mailQuoteExp2 mailQuoted2
101 hi def link mailQuoteExp3 mailQuoted3
102 hi def link mailQuoteExp4 mailQuoted4
103 hi def link mailQuoteExp5 mailQuoted5
104 hi def link mailQuoteExp6 mailQuoted6
106 let b:current_syntax = "mail"