NBash

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# serv(8) completion
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# This completes on a list of all available services for the
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# 'serv' command, followed by that script's available commands
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#
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_service_list()
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{
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    COMPREPLY=( $( serv list-all 2>/dev/null ; echo "list list-all list-startup" ) )
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    COMPREPLY=( $( compgen -W '${COMPREPLY[@]}' -- "$cur" ) )
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}
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_service_usage_list()
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{
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    local USLIST=$(serv ${prev##*/} usage 2>/dev/null | sed -e "y/|/ /" -ne "s/^.*\(u\|U\|msg_u\)sage.*{\(.*\)}.*$/\2/p")
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    COMPREPLY=( $( compgen -W '$USLIST' -- "$cur" ) )
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}
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_serv()
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{
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    local cur prev
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    COMPREPLY=()
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    _get_comp_words_by_ref cur prev
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    # don't complete for things like killall, ssh and mysql if it's
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    # the standalone command, rather than the init script
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    [[ ${COMP_WORDS[0]} != "serv" ]] && return 0
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    # don't complete past 2nd token
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    [ $COMP_CWORD -gt 2 ] && return 0
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    if [[ $COMP_CWORD -eq 1 && $prev == "serv" ]]; then
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        _service_list
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    else
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        _service_usage_list
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    fi
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    return 0
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} &&
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complete -F _serv serv
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