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#compdef fc history r

local curcontext="$curcontext" state state_descr line expl ret=1
local num cmd sep
local -a events
typeset -A opt_args
local fc_common fc_hist fc_r

# hide any replacements from _arguments
local cur=${(M)#words[1,CURRENT-1]:#*=*}
words=( "${(@)words[1,CURRENT-1]:#*=*}" "${(@)words[CURRENT,-1]}" )
(( CURRENT -= cur ))

fc_common=(
  -s -S
  '(-A -R -W -p -P)-I[include internal (new) events only]'
  '(-A -R -W -p -P)-L[include local events only]'
  '(-A -R -W -p -P)-r[reverse order of the events]'
  '(-A -R -W -e -p -P)-n[suppress line numbers]'
)

if [[ -n ${words[(r)-[pa](|[ap])]} ]]; then
  fc_common+=(
    ':history file:_files'
    ':history size:'
    ':saved history size:'
  )
  [[ -n ${words[(r)-(|a)p(|a)]} ]] || fc_common+='!-a:option:(-p)'
elif [[ -n ${words[(r)-*[ARWI]*]} ]]; then
  fc_common+=( ':history file:_files' )
else
  fc_common=( -C "$fc_common[@]"
    '(-)1:first event:->events' '2:last event:->events'
  )
fi

fc_hist=(
  '(-A -R -W -a -p -P 2)-m[treat argument as a pattern]'
  '(-A -R -W -e -f -E -i -t -a -p -P)-d[print time-stamps]'
  '(-A -R -W -e -d -E -i -t -a -p -P)-f[mm/dd/yyyy format time-stamps]'
  '(-A -R -W -e -d -f -i -t -a -p -P)-E[dd.mm.yyyy format time-stamps]'
  '(-A -R -W -e -d -f -E -t -a -p -P)-i[yyyy-mm-dd format time-stamps]'
  '(-A -R -W -e -d -f -E -i -a -p -P)-t[print time-stamps in specified format]:date format'
  '(-A -R -W -e -a -p -P)-D[print elapsed times]'

  '(-A -R -W -I -e -d -f -i -l -m -n -r -D -E -t -P)-a[with -p, automatically pop history on function return]'
  '(-A -R -W -I -e -d -f -i -l -m -n -r -D -E -t -P)-p[push current history to stack]'
  '(- *)-P[pop history from stack]'
)

fc_r='(-A -R -W -e)-l[list resulting commands on stdout]'

case $service in
  history)
    _arguments "$fc_common[@]" "$fc_hist[@]" && ret=0
  ;;
  r)
    _arguments "$fc_common[@]" "$fc_r" && ret=0
  ;;
  *)
    _arguments "$fc_common[@]" "$fc_hist[@]" "$fc_r" \
      '(-A -R -W -a -l -n -d -f -E -i -r -t -D -p -P)-e+[specify editor to invoke]:editor to invoke:_command_names -e' \
      '(-a -l -L -m -e -r -n -d -f -t -E -i -R -D -A -W -p -P *)-'{\
'R[read history from file]',\
'A[append history to file]',\
'W[write history to file]'} && ret=0
  ;;
esac

if [[ -n $state ]]; then
  zstyle -s ":completion:${curcontext}:" list-separator sep || sep=--
  if [[ -z ${line:#*=*} ]] && compset -P 1 '*='; then
    _message -e replacements 'replacement'
  elif [[ -prefix [0-9] ]]; then
    print -v events -f "%-${#HISTNO}.${#HISTNO}s $sep %s" "${(kv)history[@]}"
    _wanted -2V events expl "$state_descr" compadd -M "B:0=" -ld events - \
        "${events[@]%% *}"
  elif [[ -prefix - ]]; then
    for num cmd in "${(kv@)history}"; do
      (( num=num - HISTNO ))
      events+=( "${(r.1+$#HISTNO.)num} $sep $cmd" )
    done
    _wanted -2V events expl "$state_descr" compadd -ld events - \
        "${events[@]%% *}"
  else
    _wanted events expl "$state_descr" compadd -S '' - \
        ${${history%%[=[:IFS:]]*}:#[0-9-]*} || _guard "[0-9]#" event
  fi
fi && ret=0

return ret