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1 " Vim syntax file
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2 " Language: Mail file
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3 " Previous Maintainer: Felix von Leitner <leitner@math.fu-berlin.de>
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4 " Maintainer: Gautam Iyer <gautam@math.uchicago.edu>
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5 " Last Change: Wed 01 Jun 2005 02:11:07 PM CDT
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6
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7 " Quit when a syntax file was already loaded
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8 if exists("b:current_syntax")
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9 finish
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10 endif
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11
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12 " The mail header is recognized starting with a "keyword:" line and ending
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13 " with an empty line or other line that can't be in the header. All lines of
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14 " the header are highlighted. Headers of quoted messages (quoted with >) are
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15 " also highlighted.
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16
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17 " Syntax clusters
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18 syn cluster mailHeaderFields contains=mailHeaderKey,mailSubject,mailHeaderEmail,@mailLinks
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19 syn cluster mailLinks contains=mailURL,mailEmail
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20 syn cluster mailQuoteExps contains=mailQuoteExp1,mailQuoteExp2,mailQuoteExp3,mailQuoteExp4,mailQuoteExp5,mailQuoteExp6
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21
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22 syn case match
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23 " For "From " matching case is required. The "From " is not matched in quoted
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24 " emails
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25 " According to RFC 2822 any printable ASCII character can appear in a field
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26 " name, except ':'.
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27 syn region mailHeader contains=@mailHeaderFields,@NoSpell start="^From " skip="^\s" end="\v^[!-9;-~]*([^!-~]|$)"me=s-1
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28 syn match mailHeaderKey contained contains=mailEmail,@NoSpell "^From\s.*$"
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29
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30 syn case ignore
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31 " Nothing else depends on case. Headers in properly quoted (with "> " or ">")
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32 " emails are matched
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33 syn region mailHeader keepend contains=@mailHeaderFields,@mailQuoteExps,@NoSpell start="^\z(\(> \?\)*\)\v(newsgroups|from|((in-)?reply-)?to|b?cc|subject|return-path|received|date|replied):" skip="^\z1\s" end="\v^\z1[!-9;-~]*([^!-~]|$)"me=s-1 end="\v^\z1@!"me=s-1 end="\v^\z1(\> ?)+"me=s-1
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34
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35 syn region mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@mailQuoteExps,@NoSpell start="\v(^(\> ?)*)@<=(to|b?cc):" skip=",$" end="$"
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36 syn match mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@NoSpell "\v(^(\> ?)*)@<=(from|reply-to):.*$"
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37 syn match mailHeaderKey contained contains=@NoSpell "\v(^(\> ?)*)@<=date:"
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38 syn match mailSubject contained "\v^subject:.*$"
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39 syn match mailSubject contained contains=@NoSpell "\v(^(\> ?)+)@<=subject:.*$"
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40
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41 " Anything in the header between < and > is an email address
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42 syn match mailHeaderEmail contained contains=@NoSpell "<.\{-}>"
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43
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44 " Mail Signatures. (Begin with "-- ", end with change in quote level)
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45 syn region mailSignature keepend contains=@mailLinks,@mailQuoteExps start="^--\s$" end="^$" end="^\(> \?\)\+"me=s-1
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46 syn region mailSignature keepend contains=@mailLinks,@mailQuoteExps,@NoSpell start="^\z(\(> \?\)\+\)--\s$" end="^\z1$" end="^\z1\@!"me=s-1 end="^\z1\(> \?\)\+"me=s-1
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47
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48 " URLs start with a known protocol or www,web,w3.
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49 syn match mailURL contains=@NoSpell `\v<(((https?|ftp|gopher)://|(mailto|file|news):)[^' <>"]+|(www|web|w3)[a-z0-9_-]*\.[a-z0-9._-]+\.[^' <>"]+)[a-z0-9/]`
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50 syn match mailEmail contains=@NoSpell "\v[_=a-z\./+0-9-]+\@[a-z0-9._-]+\a{2}"
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51
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52 " Make sure quote markers in regions (header / signature) have correct color
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53 syn match mailQuoteExp1 contained "\v^(\> ?)"
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54 syn match mailQuoteExp2 contained "\v^(\> ?){2}"
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55 syn match mailQuoteExp3 contained "\v^(\> ?){3}"
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56 syn match mailQuoteExp4 contained "\v^(\> ?){4}"
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57 syn match mailQuoteExp5 contained "\v^(\> ?){5}"
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58 syn match mailQuoteExp6 contained "\v^(\> ?){6}"
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59
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60 " Even and odd quoted lines. order is imporant here!
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61 syn match mailQuoted1 contains=mailHeader,@mailLinks,mailSignature,@NoSpell "^\([a-z]\+>\|[]|}>]\).*$"
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62 syn match mailQuoted2 contains=mailHeader,@mailLinks,mailSignature,@NoSpell "^\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{2}.*$"
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63 syn match mailQuoted3 contains=mailHeader,@mailLinks,mailSignature,@NoSpell "^\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{3}.*$"
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64 syn match mailQuoted4 contains=mailHeader,@mailLinks,mailSignature,@NoSpell "^\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{4}.*$"
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65 syn match mailQuoted5 contains=mailHeader,@mailLinks,mailSignature,@NoSpell "^\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{5}.*$"
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66 syn match mailQuoted6 contains=mailHeader,@mailLinks,mailSignature,@NoSpell "^\(\([a-z]\+>\|[]|}>]\)[ \t]*\)\{6}.*$"
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67
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68 " Need to sync on the header. Assume we can do that within 100 lines
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69 if exists("mail_minlines")
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70 exec "syn sync minlines=" . mail_minlines
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71 else
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72 syn sync minlines=100
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73 endif
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74
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75 " Define the default highlighting.
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76 hi def link mailHeader Statement
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77 hi def link mailHeaderKey Type
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78 hi def link mailSignature PreProc
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79 hi def link mailHeaderEmail mailEmail
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80 hi def link mailEmail Special
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81 hi def link mailURL String
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82 hi def link mailSubject LineNR
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83 hi def link mailQuoted1 Comment
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84 hi def link mailQuoted3 mailQuoted1
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85 hi def link mailQuoted5 mailQuoted1
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86 hi def link mailQuoted2 Identifier
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87 hi def link mailQuoted4 mailQuoted2
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88 hi def link mailQuoted6 mailQuoted2
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89 hi def link mailQuoteExp1 mailQuoted1
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90 hi def link mailQuoteExp2 mailQuoted2
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91 hi def link mailQuoteExp3 mailQuoted3
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92 hi def link mailQuoteExp4 mailQuoted4
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93 hi def link mailQuoteExp5 mailQuoted5
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94 hi def link mailQuoteExp6 mailQuoted6
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95
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96 let b:current_syntax = "mail"
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