#autoload

_arch_namespace () { #double as arch_namespace_categories
  local ARCHCMD="$1"
  shift
# takes an integer argument specifying how many components:
# 1: category
# 2: branch
# 3: version
# 4: revision
  local suffix expl archive=`$ARCHCMD my-default-archive 2> /dev/null`
  local trailing_dashes=0
  [[ -n $argv[(r)--trailing-dashes] ]] && trailing_dashes=1
  local library
  [[ -n $argv[(r)--library] ]] && library='library-';
  local exclude_library_revisions=0
  [[ -n $argv[(r)--exclude-library-revisions] ]] && exclude_library_revisions=1

  if [ $1 -gt 1 ] || (( trailing_dashes )); then
    suffix=(-q -S --)
  fi
  if [[ $PREFIX = */* ]]; then
    compset -P '*/'
    archive=${IPREFIX%/*}
    _description -V categories expl "${library:-}categories in $archive"
    compadd $suffix "$expl[@]" `$ARCHCMD ${library:-}categories $archive`
  elif [ -z $IPREFIX ]; then
    local index=$(( words[(i)-A] + 1 ))
    (( index < CURRENT )) || index=$(( words[(i)--archive] + 1 ))
    (( index < CURRENT )) && archive=$words[$index]

    if [ $archive ]; then
      _description -V categories expl "${library:-}categories in $archive"
      compadd "$expl[@]" $suffix `$ARCHCMD ${library:-}categories $archive`
    fi

    _arch_archives "$ARCHCMD" -S / ${library:+--library}
  fi
  if [ $archive ] && [ $1 -gt 1 ] && [[ $PREFIX != *@* ]] \
     && [[ $PREFIX = *--* ]]; then
  #this match could be better
    _arch_namespace_branches "$ARCHCMD" $(($1 - 1))
  fi
}

(( $+functions[_arch_namespace_branches] )) ||
_arch_namespace_branches () {
  local ARCHCMD="$1"
  shift
  local suffix expl
  if [ $1 -gt 1 ] || (( $trailing_dashes )); then
    suffix=(-q -S --)
  fi
  if [[ $IPREFIX != *-- ]]; then
    compset -P 1 '*--'
    local category=${IPREFIX%--}
    _description -V branches expl "${library:-}branches"
    compadd $suffix "$expl[@]" \
      ${${(@)$($ARCHCMD ${library:-}branches $category)}##*--}
  fi
  if [ $1 -gt 1 ] && [[ $IPREFIX = *-- ]] && [[ $PREFIX = *--* ]]; then
    _arch_namespace_versions "${ARCHCMD}" $(($1 - 1))
  fi
}

(( $+functions[_arch_namespace_versions] )) ||
_arch_namespace_versions () {
  local ARCHCMD="$1"
  shift
  local suffix expl
  if [ $1 -gt 1 ]; then
    suffix=(-q -S --)
  fi
  if [[ $IPREFIX != *--*-- ]] || [[ $IPREFIX != */*--*-- ]]; then
    compset -P 1 '*--'
    local branch=${IPREFIX%--}
    _description -V versions expl "${library:-}versions"
    compadd $suffix "$expl[@]" \
      ${${(@)$($ARCHCMD ${library:-}versions $branch)}##*--}
  fi
  if [ $1 -gt 1 ] && [[ $IPREFIX = *--*-- ]] && ([[ $IPREFIX = */*--*-- ]] \
    || [[ $PREFIX != */* ]]) && [[ $PREFIX = *--* ]]; then
    _arch_namespace_revisions "${ARCHCMD}"
  fi
}

(( $+functions[_arch_namespace_revisions] )) ||
_arch_namespace_revisions () {
  local ARCHCMD="$1"
  local expl
  if [[ $IPREFIX != *--*--*-- ]] || [[ $IPREFIX != */*--*--*-- ]]; then
    compset -P 1 '*--'
    local version=${IPREFIX%--}
    _description -V revisions expl "${library:-}revisions"
    local completions c
    completions=(
      ${${(@)$($ARCHCMD ${library:-}revisions $version)}##*--}
    )
    (( exclude_library_revisions )) && \
        foreach c ($($ARCHCMD library-revisions $version)); do completions[(r)$c]=(); done
    compadd "$expl[@]" -a completions
  fi
}

_arch_namespace "$@"