zsh/Completion/Builtins/_pids

#autoload

# If given the `-m <pattern>' option, this tries to complete only pids
# of processes whose command line match the `<pattern>'.

local out list expl match desc listargs args

_tags processes || return 1

if [[ "$1" = -m ]]; then
  match="${2}*"
  shift 2
fi

zstyle -s ":completion:${curcontext}:processes" command args

out="$(_call processes ps 2>/dev/null)"

if zstyle -T ":completion:${curcontext}:processes" verbose; then
  zstyle -s ":completion:${curcontext}:processes-list" command listargs
  (( $#listargs )) || listargs=( "$args[@]" )
  if [[ "$listargs" = "$args" ]]; then
    list=("${(@Mr:COLUMNS-1:)${(f@)out}[2,-1]:#[ 	]#${PREFIX}[0-9]#${SUFFIX}[ 	]*${~match}}")
  else
    list=("${(@Mr:COLUMNS-1:)${(f@)$(_call processes-list ps 2>/dev/null)}[2,-1]:#[ 	]#${PREFIX}[0-9]#${SUFFIX}[ 	]*${~match}}")
  fi
  desc=(-ld list)
else
  desc=()
fi

_wanted processes expl 'process ID' \
    compadd "$@" "$desc[@]" - \
        ${${${(M)${(f)"${out}"}[2,-1]:#[ 	]#${PREFIX}[0-9]#${SUFFIX}[ 	]#*${~match}}## #}%% *}