# multicomp() {
# Completes all manner of files given prefixes for each path segment.
# e.g. s/z/s -> src/zsh-2.4/src
#
# Usage: e.g.
# compctl -D -f + -U -K multicomp
#
# Note that exactly matched directories are not expanded, e.g.
# s/zsh-2.4/s<TAB> will not expand to src/zsh-2.4old/src.
# Will expand glob patterns already in the word, but use complete-word,
# not TAB (expand-or-complete), or you will get ordinary glob expansion.
# Requires the -U option to compctl.
# Menucompletion is highly recommended for ambiguous matches.
# Liable to screw up escaped metacharacters royally.
# $fignore is not used: feel free to add your own bit.

local pref head sofar origtop newtop globdir="(-/)" wild
setopt localoptions nullglob rcexpandparam globdots
unsetopt markdirs globsubst shwordsplit

pref="${1}$2"
# Hack to allow programmable completion to select multicomp after a :
# (e.g.
# compctl -D -f -x 's[:]' -U -K multicomp
# )
pref="${pref#:}"

sofar=('')
reply=('')

if [[ "$pref" = \~* ]]; then
  # If the string started with ~, save the head and what it will become.
  origtop="${pref%%/*}"
  newtop=${~origtop}
  # Save the expansion as the bit matched already
  sofar=($newtop)
  pref="${pref#$origtop}"
fi

while [[ -n "$pref" ]]; do
  [[ "$pref" = /* ]] && sofar=(${sofar}/) && pref="${pref#/}"
  head="${pref%%/*}"
  pref="${pref#$head}"
  if [[ -n "$pref" && -z $sofar[2] && -d "${sofar}$head" ]]; then
    # Exactly matched directory: don't try to glob
    reply=("${sofar}$head")
  else
    [[ -z "$pref" ]] && globdir=
    # if path segment contains wildcards, don't add another.
    if [[ "$head" = *[\*\?]* ]]; then
      wild=
    else
      wild='*'
    fi
    reply=(${sofar}"${head}${wild}${globdir}")
    reply=(${~reply})
  fi

  [[ -z $reply[1] ]] && reply=() && break
  [[ -n $pref ]] && sofar=($reply)
done

# Restore ~'s in front if there were any.
# There had better not be anything funny in $newtop.
[[ -n "$origtop" ]] && reply=("$origtop"${reply#$newtop})

# }