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#autoload

# This gets two arguments, a separator (which should be only one
# character) and an array. As usual, the array may be given by it's
# name or literal as in `(foo bar baz)' (words separated by spaces in
# parentheses).
# The parts of words from the array that are separated by the
# separator character are then completed independently.

local sep pref npref i tmp2 group expl menu pre suf opre osuf orig cpre
local opts sopts matcher imm
typeset -U tmp1 matches

# Get the options.

zparseopts -D -a sopts \
    'J+:=group' 'V+:=group' 'x+:=expl' 'X+:=expl' 'P:=opts' 'F:=opts' \
    S: r: R: q 1 2 o+: n f 'M+:=matcher' 'i=imm'

sopts=( "$sopts[@]" "$opts[@]" )
if (( $#matcher )); then
  matcher="${matcher[2]}"
else
  matcher=
fi

# Get the arguments, first the separator, then the array. The array is 
# stored in `tmp1'. Further on the array `matches' will always contain
# those words from the original array that still match everything we have
# tried to match while we walk through the string from the line.

sep="$1"
if [[ "${2[1]}" = '(' ]]; then
  tmp1=( ${=2[2,-2]} )
else
  tmp1=( "${(@P)2}" )
fi

# In `pre' and `suf' we will hold the prefix and the suffix from the
# line while we walk through them. The original string are used 
# temporarily for matching.

pre="$PREFIX"
suf="$SUFFIX"
opre="$PREFIX"
osuf="$SUFFIX"
orig="$PREFIX$SUFFIX"

# Special handling for menu completion?

[[ $compstate[insert] = (*menu|[0-9]*) || -n "$_comp_correct" ||
   ( $#compstate[pattern_match] -ne 0 &&
     "$orig" != "${orig:q}" ) ]] && menu=yes

# In `pref' we collect the unambiguous prefix path.

pref=''

# If the string from the line matches at least one of the strings,
# we use only the matching strings.

compadd -O matches -M "r:|${sep}=* r:|=* $matcher" -a tmp1

(( $#matches )) || matches=( "$tmp1[@]" )

while true; do

  # Get the prefix and suffix for matching.

  if [[ "$pre" = *${sep}* ]]; then
    PREFIX="${pre%%${sep}*}"
    SUFFIX=""
  else
    PREFIX="${pre}"
    SUFFIX="${suf%%${sep}*}"
  fi

  # Check if the component for some of the possible matches is equal
  # to the string from the line. If there are such strings, we directly
  # use the stuff from the line. This avoids having `foo' complete to
  # both `foo' and `foobar'.

  if [[ -n "$PREFIX$SUFFIX" || "$pre" = ${sep}* ]]; then
    tmp1=( "${(@M)matches:#${PREFIX}${SUFFIX}${sep}*}" )
  else
    tmp1=()
  fi

  if (( $#tmp1 )); then
    npref="${PREFIX}${SUFFIX}${sep}"
  else
    # No exact match, see how many strings match what's on the line.

    builtin compadd -O tmp1 -M "r:|${sep}=* r:|=* $matcher" - "${(@)${(@)matches%%${sep}*}:#}"

    [[ $#tmp1 -eq 0 && -n "$_comp_correct" ]] &&
      compadd -O tmp1 -M "r:|${sep}=* r:|=* $matcher" - "${(@)${(@)matches%%${sep}*}:#}"

    if [[ $#tmp1 -eq 1 ]]; then

      # Only one match. If there are still separators from the line
      # we just accept this component. Otherwise we insert what we 
      # have collected, probably giving it a separator character
      # as a suffix.

      if [[ "$pre$suf" = *${sep}* ]]; then
        npref="${tmp1[1]}${sep}"
      else
        matches=( "${(@M)matches:#${tmp1[1]}*}" )

	PREFIX="${cpre}${pre}"
	SUFFIX="$suf"

	if [[ $#imm -ne 0 && $#matches -eq 1 ]] ||
           zstyle -t ":completion:${curcontext}:" expand suffix; then
	  compadd "$group[@]" "$expl[@]" "$sopts[@]" \
                  -M "r:|${sep}=* r:|=* $matcher" - $pref$matches
        else
	  if (( $matches[(I)${tmp1[1]}${sep}*] )); then
	    compadd "$group[@]" "$expl[@]" -p "$pref" -r "$sep" -S "$sep" "$opts[@]" \
                    -M "r:|${sep}=* r:|=* $matcher" - "$tmp1[1]"
          else
	    compadd "$group[@]" "$expl[@]" -p "$pref" "$sopts[@]" \
                    -M "r:|${sep}=* r:|=* $matcher" - "$tmp1[1]"
          fi
        fi
	return
      fi
    elif (( $#tmp1 )); then
      local ret=1

      # More than one match. First we get all strings that match the
      # rest from the line.

      PREFIX="$pre"
      SUFFIX="$suf"
      compadd -O matches -M "r:|${sep}=* r:|=* $matcher" -a matches

      if [[ "$pre" = *${sep}* ]]; then
 	PREFIX="${cpre}${pre%%${sep}*}"
	SUFFIX="${sep}${pre#*${sep}}${suf}"
      else
        PREFIX="${cpre}${pre}"
	SUFFIX="$suf"
      fi

      # The purpose of this check (or one purpose, anyway) seems to be to ensure
      # that the suffix for the current segment on the command line doesn't
      # match across segments. For example, we want $matches for a<TAB>c to
      # include abc/d, but not abd/c. If we don't have anything on the command
      # line for this segment, though, we can skip it. (The difference is only
      # noticeable when there are a huge number of possibilities)
      [[ -n $pre$suf ]] &&
      matches=( ${(@M)matches:#(${(j<|>)~${(@b)tmp1}})*} )

      if ! zstyle -t ":completion:${curcontext}:" expand suffix ||
         [[ -n "$menu" || -z "$compstate[insert]" ]]; then

        # With menu completion we add only the ambiguous component with
        # the prefix collected and a separator for the matches that
        # have more components.

        tmp2="$pre$suf"
        if [[ "$tmp2" = *${sep}* ]]; then
          tmp2=(-s "${sep}${tmp2#*${sep}}")
        else
	  tmp2=()
        fi


        compadd "$group[@]" "$expl[@]" -r "$sep" -S "$sep" "$opts[@]" \
	        -p "$pref" "$tmp2[@]" -M "r:|${sep}=* r:|=* $matcher" - \
                "${(@)${(@)${(@M)matches:#*${sep}}%%${sep}*}:#}" && ret=0
        (( $matches[(I)${sep}*] )) &&
            compadd "$group[@]" "$expl[@]" -S '' "$opts[@]" \
	            -p "$pref" \
                    -M "r:|${sep}=* r:|=* $matcher" - "$sep" && ret=0
        compadd "$group[@]" "$expl[@]" -r "$sep" -S "$sep" "$opts[@]" \
                -p "$pref" "$tmp2[@]" -M "r:|${sep}=* r:|=* $matcher" - \
                "${(@)${(@)${(@M)matches:#*?${sep}?*}%%${sep}*}:#}" && ret=0
        compadd "$group[@]" "$expl[@]" -S '' "$opts[@]" -p "$pref" "$tmp2[@]" \
                -M "r:|${sep}=* r:|=* $matcher" - \
                "${(@)matches:#*${sep}*}" && ret=0
      else
        # With normal completion we add all matches one-by-one with
	# the unmatched part as a suffix. This will insert the longest
	# unambiguous string for all matching strings.

        compadd "$group[@]" "$expl[@]" "$opts[@]" \
	        -p "$pref" -s "${i#*${sep}}" \
                -M "r:|${sep}=* r:|=* $matcher" - \
                "${(@)${(@)${(@M)matches:#*${sep}*}%%${sep}*}:#}" && ret=0
        compadd "$group[@]" "$expl[@]" -S '' "$opts[@]" -p "$pref" \
                -M "r:|${sep}=* r:|=* $matcher" - \
                "${(@)matches:#*${sep}*}" && ret=0
      fi
      return ret
    else
      # We are here if no string matched what's on the line. In this
      # case we insert the expanded prefix we collected if it differs
      # from the original string from the line.

      { ! zstyle -t ":completion:${curcontext}:" expand prefix ||
        [[ "$orig" = "$pref$pre$suf" ]] } && return 1

      PREFIX="${cpre}${pre}"
      SUFFIX="$suf"

      if [[ -n "$suf" ]]; then
        compadd "$group[@]" "$expl[@]" -s "$suf" "$sopts[@]" \
                -M "r:|${sep}=* r:|=* $matcher" - "$pref$pre"
      else
        compadd "$group[@]" "$expl[@]" -S '' "$opts[@]" \
                -M "r:|${sep}=* r:|=* $matcher" - "$pref$pre"
      fi
      return
    fi
  fi

  # We just accepted and/or expanded a component from the line. We
  # remove it from the matches (using only those that have a least
  # the skipped string) and ad it the `pref'.

  matches=( "${(@)${(@)${(@M)matches:#${npref}*}#*${sep}}:#}" )
  pref="$pref$npref"

  # Now we set `pre' and `suf' to their new values.

  if [[ "$pre" = *${sep}* ]]; then
    cpre="${cpre}${pre%%${sep}*}${sep}"
    pre="${pre#*${sep}}"
  elif [[ "$suf" = *${sep}* ]]; then
    cpre="${cpre}${pre}${suf%%${sep}*}${sep}"
    pre="${suf#*${sep}}"
    suf=""
  else
    # The string from the line is fully handled. If we collected an
    # unambiguous prefix and that differs from the original string,
    # we insert it.

    PREFIX="${opre}${osuf}"
    SUFFIX=""

    if [[ -n "$pref" && "$orig" != "$pref" ]]; then
      if [[ "$pref" = *${sep}*${sep} ]]; then
        compadd "$group[@]" "$expl[@]" "$opts[@]" \
                -p "${pref%${sep}*${sep}}${sep}" -S "$sep" \
                -M "r:|${sep}=* r:|=* $matcher" - "${${pref%${sep}}##*${sep}}"

      elif [[ "$pref" = *${sep}* ]]; then
        compadd "$group[@]" "$expl[@]" -S '' "$opts[@]" \
                -p "${pref%${sep}*}${sep}" \
                -M "r:|${sep}=* r:|=* $matcher" - "${pref##*${sep}}"
      else
        compadd "$group[@]" "$expl[@]" -S '' "$opts[@]" \
                -M "r:|${sep}=* r:|=* $matcher" - "$pref"
      fi
    fi
    return
  fi
done
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