diplodocus.org Git - nmh/blob - uip/mhmail

   1 #! /bin/sh
   2 #
   3 # mhmail -- simple mail program
   4 #
   5 # This code is Copyright (c) 2012, by the authors of nmh.  See the
   6 # COPYRIGHT file in the root directory of the nmh distribution for
   7 # complete copyright information.
   8 #
   9 # Emulation of compiled mhmail(1), with these differences:
  10 # * Adds -send/-nosend, -headerfield, and -attach options.
  11 # * Adds optional -to switch for recipient addresses.
  12 # * Supports all post(8) (by default, without -profile) or send(1)
  13 #   (with -profile) options.
  14 # * Optionally (with -profile) obeys the users profile, including
  15 #   AliasFile and send entries.
  16 # * Instead of silently not sending an empty message, notifies user
  17 #   "mhmail: empty message not sent, use -body '' to force."
  18 # * The compiled mhmail dropped a trailing newline from the -body argument.
  19 # * Drops support for undocumented -queue option.
  20
  21 usage='Usage: mhmail [-t(o)] addrs ... [switches]
  22   switches are:
  23   -at(tach) file [-at(tach) file] ...
  24   -b(ody) text
  25   -c(c) addrs ...
  26   -f(rom) addr
  27   -hea(derfield) name:value [-hea(derfield) name:value] ...
  28   -su(bject) text
  29   -r(esent)
  30   -pr(ofile)
  31   -se(nd)
  32   -nose(nd)
  33   -v(ersion)
  34   -hel(p)
  35   and all post(8)/send(1) switches
  36   mhmail with no arguments is equivalent to inc'
  37
  38 bindir=`dirname $0`
  39 nmhbindir=`cd "${bindir}" && pwd`
  40
  41 #### Checks for missing mandatory arguments.
  42 checkforargs() {
  43   if [ ${attacharg} -eq 1 ]; then
  44     printf "mhmail: missing argument to -attach\n"; exit 1
  45   elif [ ${bodyarg} -eq 1 ]; then
  46     printf "mhmail: missing argument to -body\n"; exit 1
  47   elif [ ${ccarg} -eq 1  -a  "${cclist}"x = x ]; then
  48     printf "mhmail: missing argument to -cc\n"; exit 1
  49   elif [ ${fromarg} -eq 1 ]; then
  50     printf "mhmail: missing argument to -from\n"; exit 1
  51   elif [ ${headerfieldarg} -eq 1 ]; then
  52     printf "mhmail: missing argument to -headerfield\n"; exit 1
  53   elif [ ${subjectarg} -eq 1 ]; then
  54     printf "mhmail: missing argument to -subject\n"; exit 1
  55   elif [ ${toarg} -eq 1 ]; then
  56     printf "mhmail: missing argument to -to\n"; exit 1
  57   fi
  58 }
  59
  60 if [ $# -eq 0 ]; then
  61   #### Emulate mhmail for reading mail.
  62   exec "${nmhbindir}"/inc
  63 else
  64   #### Go through all the switches so we can build the draft.
  65   tolist=                     ## To: addresses
  66   toarg=0                     ## whether currently handling -to
  67   attacharg=0                 ## whether currently handling -attach
  68   attach_send_switch_added=0  ## whether added "-attach Nmh-Attachment" switch
  69   body=                       ## contents of the message body
  70   bodyarg=0                   ## whether currently handling -body
  71   cclist=                     ## Cc: addresses
  72   ccarg=0                     ## whether currently handling -cc
  73   from=                       ## From: contents
  74   fromarg=0                   ## whether currently handling -from
  75   headerfieldlist=            ## header fields to be added to draft
  76   headerfieldarg=0            ## whether currently handling -headerfield
  77   mhmailswitch=0              ## whether currently handling any mhmail switch
  78   subject=                    ## Subject: contents
  79   subjectarg=0                ## whether currently handling -subject
  80   resent=0                    ## whether resending
  81   postsendargs=               ## switches to pass on to post or send
  82   post_send_switch_arg=0      ## whether currently handling a post/send switch
  83   use_send=0                  ## use post (default) or send (-profile)
  84   sendsw=1                    ## to send (default) or not to send
  85   for arg in "$@"; do
  86     case "${arg}" in
  87       #### Post and send won't accept -f -or -s because they'd be
  88       #### ambiguous, so no conflicts with them.  And they don't have
  89       #### -b, -c, -r, -t.  For the new switches that compiled mhmail
  90       #### didn't have:  let -p indicate mhmail -profile, not send
  91       #### -port.  -send masks the send(1) -send switch.  -attach
  92       #### masks the send(1) -attach switch.
  93       -at|-att|-atta|-attac|-attach)
  94          mhmailswitch=1
  95          attacharg=1
  96          use_send=1
  97          if [ ${attach_send_switch_added} -eq 0 ]; then
  98            #### Override any send -attach switch in user's profile.
  99            postsendargs=\
 100 "${postsendargs:+${postsendargs} }-attach Nmh-Attachment"
 101            attach_send_switch_added=1
 102          fi ;;
 103       -b|-bo|-bod|-body) mhmailswitch=1; bodyarg=1 ;;
 104       -c|-cc) mhmailswitch=1; ccarg=1 ;;
 105       -f|-fr|-fro|-from) mhmailswitch=1; fromarg=1 ;;
 106       -hea|-head|-heade|-header|-headerf|-headerfi|-headerfie|-headerfiel|\
 107 -headerfield) mhmailswitch=1; headerfieldarg=1 ;;
 108       -hel|-help) printf "%s\n" "${usage}"; exit ;;
 109       -nose|-nosen|-nosend) mhmailswitch=1; sendsw=0 ;;
 110       -p|-pr|-pro|-prof|-profi|-profil|-profile) mhmailswitch=1; use_send=1 ;;
 111       -resend) printf "mhmail: did you mean -resent instead of -resend?\n" 1>&2
 112          exit 1 ;;
 113       -r|-re|-res|-rese|-resen|-resent) mhmailswitch=1; resent=1 ;;
 114       -se|-sen|-send) mhmailswitch=1; sendsw=1 ;;
 115       -su|-sub|-subj|-subje|-subjec|-subject) mhmailswitch=1; subjectarg=1 ;;
 116       -t|-to) toarg=1; ccarg=0 ;;
 117       -v|-ve|-ver|-vers|-versi|-versio|-version)
 118          #### Cheat instead of using autoconf and make to fill in the version.
 119          "${nmhbindir}"/mhpath -v | sed 's/mhpath/mhmail/'; exit ;;
 120       -*) if [ ${mhmailswitch} -eq 1 ]; then
 121             checkforargs
 122             mhmailswitch=0
 123           fi
 124           post_send_switch_arg=1
 125           postsendargs="${postsendargs:+${postsendargs} }${arg}" ;;
 126       *) mhmailswitch=0
 127          if [ ${bodyarg} -eq 1 ]; then
 128            body="${arg}
 129 "
 130            bodyarg=0
 131            #### Allow -body "" by using just a newline for the body.
 132            [ "${body}"x = x ]  &&  body='
 133 '
 134          elif [ ${fromarg} -eq 1 ]; then
 135            from="${arg}"
 136            fromarg=0
 137          elif [ ${subjectarg} -eq 1 ]; then
 138            subject="${arg}"
 139            subjectarg=0
 140          elif [ ${attacharg} -eq 1 ]; then
 141            headerfieldlist="${headerfieldlist:+${headerfieldlist}}\
 142 Nmh-Attachment: ${arg}
 143 "
 144            attacharg=0
 145          elif [ ${headerfieldarg} -eq 1 ]; then
 146            #### It's not strictly necessary to have one space after
 147            #### the : that separates the header field name from the
 148            #### body, but do it to avoid surprising someone.
 149            add=`printf "${arg}" | sed -e 's/:/: /' -e 's/:  /: /'`
 150            headerfieldlist="${headerfieldlist:+${headerfieldlist}}${add}
 151 "
 152            headerfieldarg=0
 153          elif [ ${post_send_switch_arg} -eq 1 ]; then
 154            postsendargs="${postsendargs:+${postsendargs} }${arg}"
 155          elif [ ${ccarg} -eq 1 ]; then
 156            #### ccarg can only be reset to 0 by -to.
 157            cclist="${cclist:+${cclist}, }${arg}"
 158          else
 159            #### An address.
 160            tolist="${tolist:+${tolist}, }${arg}"
 161            toarg=0
 162          fi ;;
 163     esac
 164   done
 165
 166   #### Check for at least one address and -from.
 167   if [ "${tolist}"x = x ]; then
 168     printf "mhmail: usage: mhmail addrs ... [switches]\n"; exit 1
 169   fi
 170   if [ "${from}"x = x ]; then
 171     nmhlibdir=`${nmhbindir}/mhparam libdir`/
 172     from=`${nmhlibdir}ap -format '%(localmbox)' 0`
 173   fi
 174
 175   #### Check for missing mandatory arguments.
 176   checkforargs
 177
 178   #### Build header.
 179   [ ${resent} -eq 0 ]  &&  prefix=  ||  prefix='Resent-'
 180   header="${prefix}To: ${tolist}
 181 "
 182   [ "${cclist}"x = x ]  ||  header="${header}${prefix}Cc: ${cclist}
 183 "
 184   [ "${subject}"x = x ]  ||  header="${header}${prefix}Subject: ${subject}
 185 "
 186   [ "${from}"x = x ]  ||  header="${header}${prefix}From: ${from}
 187 "
 188
 189   if [ "${headerfieldlist}" ]; then
 190     header="${header}${headerfieldlist}"
 191   fi
 192
 193   #### Set up a file to supply as a draft to post/send.  And set a
 194   #### trap to remove it.  send moves the file to a backup, so it will
 195   #### remove that, too.
 196   umask 077
 197   tmpdir="${MHTMPDIR:-${TMPDIR:-${TMP:-`${nmhbindir}/mhpath +`}}}"
 198   tmpfile="${tmpdir}/mhmail$$"
 199   tmpfilebackup="${tmpdir}/[,#]mhmail$$"
 200   tmpfileresent=
 201
 202   message_file=
 203   if [ ${resent} -eq 0 ]; then
 204     #### Add blank line after header if not resending.
 205     header="${header}
 206 "
 207     message_file="${tmpfile}"
 208   else
 209     if [ ${use_send} -eq 0 ]; then
 210       postsendargs="${postsendargs:+${postsendargs} }-dist"
 211       message_file="${tmpfile}"
 212     else
 213       #### When resending with send, tmpfile will just contain the
 214       #### Resent- header fields.  "${tmpfileresent}" will contain
 215       #### the message that is being resent.
 216       tmpfileresent="${tmpdir}/mhmail-resent$$"
 217       mhdist=1; export mhdist
 218       mhaltmsg=${tmpfileresent}; export mhaltmsg
 219       message_file="${tmpfileresent}"
 220       printf "" >"${message_file}"  || exit 2
 221     fi
 222   fi
 223
 224   trap 'rm -f '"${tmpfile}"' '"${tmpfilebackup}"' '"${tmpfileresent}" EXIT
 225
 226   if [ "${body}"x = x ]; then
 227     #### First put message header in the file.
 228     printf "%s" "${header}" >"${tmpfile}" || exit 2
 229
 230     tmpfile_size_before=`wc -c "${message_file}"`
 231     #### Now grab the body from stdin.  cat >> handles blank lines
 232     #### better than body=`cat`.
 233     cat >>"${message_file}" || exit 2
 234     tmpfile_size_after=`wc -c "${message_file}"`
 235
 236     #### Don't allow an empty body (from stdin).  Use string
 237     #### comparison so we don't have to strip the filename, etc.
 238     if [ "${tmpfile_size_before}" = "${tmpfile_size_after}" ]; then
 239       printf "mhmail: empty message not sent, use -body '' to force.\n" 1>&2
 240       exit 1
 241     fi
 242
 243     #### Add trailing newline to body if it doesn't have one.
 244     if [ `tail -n 1 "${message_file}" | wc -l` -ne 1 ]; then
 245       printf "\n" >>"${message_file}" || exit 2
 246     fi
 247   else
 248     #### Add trailing newline to body if it doesn't have one.
 249     [ `printf "${body}" | tail -n 1 | wc -l` -ne 1 ]  &&  body="${body}
 250 "
 251
 252     if [ "${tmpfileresent}" ]; then
 253       #### Put just the new message header in the file.
 254       printf "%s" "${header}" >"${tmpfile}" || exit 2
 255       #### and the body in the file to resend.
 256       printf "${body}" >"${tmpfileresent}" || exit 2
 257     else
 258       #### Put message header and body in the file.
 259       printf "%s" "${header}${body}" >"${tmpfile}" || exit 2
 260     fi
 261   fi
 262
 263   if [ ${sendsw} -eq 0 ]; then
 264     cat "${tmpfile}"
 265   else
 266     if [ ${use_send} -eq 0 ]; then
 267       post_or_send=`${nmhbindir}/mhparam postproc`
 268     else
 269       post_or_send="${nmhbindir}/send"
 270     fi
 271
 272     if "${post_or_send}" "${tmpfile}" ${postsendargs}; then
 273       exit
 274     else
 275       printf "Letter saved in dead.letter\n"
 276       #### exec skips the trap set above.
 277       [ "${tmpfileresent}" ]  &&  rm -f "${tmpfileresent}"
 278       exec mv "${tmpfile}" dead.letter
 279     fi
 280   fi
 281 fi