#compdef -p */(init|rc[0-9S]#).d/*

local magic cmds what script

_compskip=all

# This should probably be system specific...

script=$words[1]
if [[ $script != */* ]]; then
  local -a scriptpath
  local dir
  # Known locations of init scripts
  # C.f. Unix/Type/_services
  scriptpath=(/etc/init.d /etc/rc.d /etc/rc.d/init.d)

  for dir in $scriptpath; do
    if [[ -f $dir/$script ]]; then
      script=$dir/$script
      break
    fi
  done
fi

# If the file starts with `#!' we hope that this is a shell script
# and get lines looking like <space>foo|bar) with the words in $what.

what='(st(art|op|atus)|(force-|)re(start|load)|debug_(up|down)|dump(|_stats)|add|delete|clean|list)'

read -u0 -k2 magic < $script && [[ $magic = '#!' ]] &&
    cmds=( ${${(j:|:s:|:)${(M)${(f)"$(< $script)"}:#[[:blank:]]#(\'|)${~what}([[:blank:]]#\|[[:blank:]]#${~what})#(\'|)\)}}//[^-a-z_]} )

# This would be the pattern to use every line of the form <space>foo).
# Some people say this might match too many lines...
#
#    cmds=( ${${(j:|:s:|:)${(M)${(f)"$(< $script)"}:#[[:blank:]]#(\'|)[a-z_|]##\'|)\)}}//[^a-z_]} )

(( $#cmds )) || zstyle -a ":completion:${curcontext}:commands" commands cmds ||
    cmds=(start stop)

_sub_commands $cmds