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#compdef ali dist flist flists folder folders forw comp inc mark refile repl scan show next prev packf rmf rmm pick whom mhn mhpath mhlist mhstore mhshow mhparam mhmail

# Completion for all possible MH commands.

local mymhdir=${$(_call_program mhpath mhpath + 2>/dev/null):-~/Mail}
local mhlib=/usr/lib/mh

local prev="$words[CURRENT-1]" expl

if compset -P 1 -; then
  # get list of options, which MH commands can generate themselves
  # awk is just too icky to use for this, sorry.  send me one if
  # you come up with it.
  local -a options disp
  options=(
    $($words[1] -help | perl -ne 'if (/^\s*-\(?(\S+)/) {
       $n = $1;
       $n =~ s/\)//g;
       print $n =~ s/^\[([a-z]+)\]// ? "$n\n$1$n\n" : "$n\n";
    }')
  )
  if zstyle -t ":completion:${curcontext}:options" prefix-hidden; then
      _wanted options expl option compadd -d disp - "$options[@]"
  else
      disp=( -${options} )
      _wanted options expl option compadd -d disp - "$options[@]"
  fi    
  return
elif compset -P 1 '[+@]' || [[ "$prev" = -draftfolder ]]; then
  # Complete folder names.
  local mhpath

  if [[ $IPREFIX != '@' ]]; then
    [[ $IPREFIX = '+' ]] || IPREFIX=+
    mhpath=$mymhdir
  else
    mhpath=$(mhpath)
  fi

  _wanted files expl 'MH folder' _path_files -W mhpath -/
elif [[ "$prev" = -(editor|(whatnow|rmm|show|more)proc) ]]; then
  _command_names -e
elif [[ "$prev" = -file ]]; then
  _files
elif [[ "$prev" = -(form|audit|filter) ]]; then
  # Need some MH template file, which may be in our own MH directory
  # or with the standard library.
  local mhfpath
  # This is the only place we need mhlib, so leave the test till here.
  mhlib=${${$(mhparam mhlproc 2>/dev/null):h}:-/usr/lib/mh}
  mhfpath=($mymhdir $mhlib)

  _wanted files expl 'MH template file' _files -W mhfpath -g '*(.)'
elif [[ $service = mhmail ]]; then
  _email_addresses
elif [[ "$prev" = -(no|)cc ]]; then
  _wanted -C "$prev" values expl 'CC address' compadd all to cc me
elif [[ "$prev" = -[rw]cache ]]; then
  _wanted -C "$prev" values expl cache compadd public private never ask
elif [[ $service = mhparam ]]; then
  _wanted parameters expl 'MH parameter' compadd - \
    ${${(f)"$(mhparam -all)"}%%:*}
elif [[ $service = ali ]]; then
  _email_addresses -n MH
else
  # Generate sequences.
  local foldnam folddir f ret

  for f in $words; do
    [[ $f = [@+]* ]] && foldnam=$f
  done
  if [[ $foldnam = '+'* ]]; then
    folddir=$mymhdir/${foldnam#+}
  elif [[ $foldnam = '@'* ]]; then
    folddir=$(mhpath)/${foldnam#@}
  else
    folddir=$(mhpath)
    # leaving foldnam empty works here
  fi

  _tags sequences
  while _tags; do
    while _next_label sequences expl sequence; do
      compadd "$expl[@]" $(mark $foldnam 2>/dev/null | awk -F: '{ print $1 }') &&
        ret=0
      compadd "$expl[@]" reply next cur prev first last all unseen && ret=0
      _files "$expl[@]" -W folddir -g '<->' && ret=0
    done
    (( ret )) || return 0
  done
  return ret
fi