# bash completion for GNU tar -*- shell-script -*-

_tar()
{
local cur prev words cword split
_init_completion -s || return

local ext regex tar untar

if [[ $cword -eq 1 ]]; then
COMPREPLY=( $( compgen -W 'c t x u r d A' -- "$cur" ) )
return 0
fi

local tars='@(@(tar|gem|spkg)?(.@(Z|[bgx]z|bz2|lz?(ma)))|t@([abglx]z|b?(z)2))'

case ${words[1]} in
--*)
;;
?(-)*[cr]*f)
if [[ $cword -eq 2 ]]; then
ext='@(tar|gem|spkg)'
case ${words[1]} in
*a*) ext="$tars" ;;
*z*) ext='t?(ar.)gz' ;;
*Z*) ext='ta@(r.Z|z)' ;;
*[jy]*) ext='t@(?(ar.)bz?(2)|b2)' ;;
*J*) ext='t?(ar.)xz' ;;
esac
_filedir $ext
else
_filedir
fi
return 0
;;
+([^ZzJjy])f)
ext="$tars"
regex='\(\(tar\|gem\|spkg\)\(\.\(Z\|[bgx]z\|bz2\|lz\(ma\)\?\)\)\?\|t\([abglx]z\|bz\?2\)\)'
;;
*[Zz]*f)
ext='@(@(t?(ar.)|gem.|spkg.)@(gz|Z)|taz)'
regex='\(\(t\(ar\.\)\?\|gem\.\|spkg\.\)\(gz\|Z\)\|taz\)'
;;
*[jy]*f)
ext='@(@(t?(ar.)|gem.)bz?(2)|spkg|tb2)'
regex='\(\(t\(ar\.\)\?\|gem\.\)bz2\?\|spkg\|tb2\)'
;;
*[J]*f)
ext='@(@(tar|gem|spkg).@(lzma|xz)|t[lx]z)'
regex='\(\(tar\|gem\|spkg\)\.\(lzma\|xz\)\|t[lx]z\)'
;;
*)
_filedir
return 0
;;
esac

case $prev in
*${ext:-$tars})
# complete on files in tar file
#
# get name of tar file from command line
tar=$( sed -e 's/^.* \([^ ]*'$regex'\) .*$/\1/' <<<"${words[@]}" )
# devise how to untar and list it
untar=t${words[1]//[^Jzjyf]/}

local IFS=$'\n'
COMPREPLY=( $( compgen -W "$( printf '%s\n' $( tar $untar $tar \
2>/dev/null ) )" -- "$cur" ) )
return 0
;;
-C|--directory)
_filedir -d
return 0
;;
--atime-preserve)
COMPREPLY=( $( compgen -W 'replace system' -- "$cur" ) )
return 0
;;
--group)
COMPREPLY=( $( compgen -g -- "$cur" ) )
return 0
;;
--owner)
COMPREPLY=( $( compgen -u -- "$cur" ) )
return 0
;;
-F|--info-script|--new-volume-script|--rmt-command|--rsh-command|\
-I|--use-compress-program)
compopt -o filenames
COMPREPLY=( $( compgen -c -- "$cur" ) )
return 0
;;
--volno-file|--add-file|-T|--files-from|-X|--exclude-from|--index-file)
_filedir
return 0
;;
-H|--format)
COMPREPLY=( $( compgen -W 'gnu oldgnu pax posix ustar v7' \
-- "$cur" ) )
return 0
;;
--quoting-style)
COMPREPLY=( $( compgen -W 'literal shell shell-always c c-maybe
escape locale clocale' -- "$cur" ) )
return 0
;;
--totals)
COMPREPLY=( $( compgen -W 'SIGHUP SIGQUIT SIGINT SIGUSR1 SIGUSR2' \
-- "$cur" ) )
return 0
;;
--occurrence|--sparse-version|--to-command|--mode|--mtime|\
--tape-length|-b|--blocking-factor|--record-size|-V|--text|--backup|\
--exclude|--exclude-tag*|-K|--starting-file|-N|--newer|--after-date|\
--suffix|--strip-components|--transform|--xform|--checkpoint|\
--checkpoint-action|--no-quote-chars|--quote-chars|--warnings)
return 0
;;
esac

$split && return 0

# file completion on relevant files
_filedir "$ext"

return 0
}
[ -n "${COMP_TAR_INTERNAL_PATHS:-}" ] && complete -F _tar -o dirnames tar ||
complete -F _tar tar

# ex: ts=4 sw=4 et filetype=sh