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  38         Fri, 28 Oct 2011 04:06:11 -0700 (PDT)\r
  39 From: Daniel Schoepe <daniel@schoepe.org>\r
  40 To: Jameson Graef Rollins <jrollins@finestructure.net>,\r
  41         Thomas Schwinge <thomas@schwinge.name>\r
  42 Subject: Re: [PATCH] emacs: Modify notmuch-show-get-message-id to return\r
  43         message-id unprefixed with "id:".\r
  44 In-Reply-To: <87ehxzb0xg.fsf@servo.finestructure.net>\r
  45 References: <87mxdabyy8.fsf@washington.ligo-wa.caltech.edu>\r
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  47         <87ehykflzw.fsf@kepler.schwinge.homeip.net>\r
  48         <87ehxzb0xg.fsf@servo.finestructure.net>\r
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  51 Date: Fri, 28 Oct 2011 13:06:09 +0200\r
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  70 \r
  71 --=-=-=\r
  72 Content-Transfer-Encoding: quoted-printable\r
  73 \r
  74 On Wed, 26 Oct 2011 19:52:59 -0700, Jameson Graef Rollins <jrollins@finestr=\r
  75 ucture.net> wrote:\r
  76 > In point of fact, do we need these quotes around message IDs at all?\r
  77 > Can message IDs have characters that would need to be escaped for the\r
  78 > shell?\r
  79 \r
  80 Message ID syntax is defined in RFC 2822[1]:\r
  81 > message-id      =3D       "Message-ID:" msg-id CRLF\r
  82 >=20\r
  83 > in-reply-to     =3D       "In-Reply-To:" 1*msg-id CRLF\r
  84 >=20\r
  85 > references      =3D       "References:" 1*msg-id CRLF\r
  86 >=20\r
  87 > msg-id          =3D       [CFWS] "<" id-left "@" id-right ">" [CFWS]\r
  88 >=20\r
  89 > id-left         =3D       dot-atom-text / no-fold-quote / obs-id-left\r
  90 >=20\r
  91 > id-right        =3D       dot-atom-text / no-fold-literal / obs-id-right\r
  92 >=20\r
  93 > no-fold-quote   =3D       DQUOTE *(qtext / quoted-pair) DQUOTE\r
  94 >\r
  95 > no-fold-literal =3D       "[" *(dtext / quoted-pair) "]"\r
  96 \r
  97 And since\r
  98 > quoted-pair     =3D       ("\" text) / obs-qp\r
  99 >\r
 100 > text            =3D       %d1-9 /         ; Characters excluding CR and LF\r
 101 >                        %d11 /\r
 102 >                        %d12 /\r
 103 >                        %d14-127 /\r
 104 >                        obs-text\r
 105 \r
 106 It can theoretically include pretty much any character, including\r
 107 quotes, if they are properly escaped. Hence, the query parser would have\r
 108 to take that into account, but surrounding them by quotes probably isn't\r
 109 useful anyway.\r
 110 \r
 111 As far passing things to the shell goes:\r
 112 \r
 113 > atext           =3D       ALPHA / DIGIT / ; Any character except controls,\r
 114 >                         "!" / "#" /     ;  SP, and specials.\r
 115 >                         "$" / "%" /     ;  Used for atoms\r
 116 >                         "&" / "'" /\r
 117 >                         "*" / "+" /\r
 118 >                         "-" / "/" /\r
 119 >                         "=3D" / "?" /\r
 120 >                         "^" / "_" /\r
 121 >                         "`" / "{" /\r
 122 >                         "|" / "}" /\r
 123 >                         "~"\r
 124 >=20\r
 125 > atom            =3D       [CFWS] 1*atext [CFWS]\r
 126 >=20\r
 127 > dot-atom        =3D       [CFWS] dot-atom-text [CFWS]\r
 128 >=20\r
 129 > dot-atom-text   =3D       1*atext *("." 1*atext)\r
 130 \r
 131 So, they can contain things like "$foo@$bar", which will be mangled if\r
 132 passed to the shell, even with double quotes.\r
 133 \r
 134 [1] http://tools.ietf.org/html/rfc2822#section-3.6.4\r
 135 \r
 136 Cheers,\r
 137 Daniel\r
 138 \r
 139 --=-=-=\r
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