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/usr/share/bash-completion/completions/bts is in devscripts 2.17.12ubuntu1.

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The actual contents of the file can be viewed below.

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# /usr/share/bash-completion/completions/bts
# Bash command completion for ‘bts(1)’.
# Documentation: ‘bash(1)’, section “Programmable Completion”.

# Copyright © 2015, Nicholas Bamber <nicholas@periapt.co.uk>

_get_version_from_package()
{
    local _pkg=$1
    [[ -n $_pkg ]] || return 
    apt-cache madison $_pkg 2> /dev/null | cut -d'|' -f2 | sort | uniq | paste -s -d' '
}

# This works really well unless someone sets up nasty firewall rules like:
# sudo iptables -A OUTPUT -d 206.12.19.140 -j DROP
# sudo iptables -A OUTPUT -d 140.211.166.26 -j DROP
# These block access to the Debian bugs SOAP interface.
# Hence we need a timeout.
# Of course if the SOAP interface is blocked then so is the caching interface.
# So really this would only affect someone who only accidentally hit the TAB key.
_get_version_from_bug()
{
    local -i _bug=$1
    _get_version_from_package $( bts --soap-timeout=2 status $_bug fields:package 2> /dev/null | cut -f2 )
}

_suggest_packages()
{
    apt-cache --no-generate pkgnames "$1" 2> /dev/null
}

_suggest_bugs()
{
    bts --offline listcachedbugs "$1" 2> /dev/null
}

_bts()
{
    local cur prev words cword
    _init_completion -n = || return

    # Note:
    # The long lists of subcommands are not the same and not necessarily to be kept in sync.
    # The first is used to suggest commands after a '.' or ','.
    # The second is to hook in special handling (which may be as little as admitting we 
    # we can't handle it further) or the default special handling (list of bug ids).
    # This also includes "by" and "with" which are not even subcommands.
    # The third is similar to the first - what to suggest after the bts command (and options).
    # but this includes the "help" and "version" commands.

    # A sequence of bts commands can be on one command line separated by "." or ",". 
    if [[ $prev == @(.|,) ]]; then
        COMPREPLY=( $( compgen -W 'show bugs unmerge select status clone done reopen archive unarchive retitle summary submitter reassign found notfound fixed notfixed block unblock merge forcemerge tags affects user usertags claim unclaim severity forwarded notforwarded package limit owner noowner subscribe unsubscribe reportspam spamreport' -- "$cur" ) )
        return 0
    fi

    # Identify the last command in the command line.
    local special punctuation i
    for (( i=${#words[@]}-1; i > 0; i-- )); do
        if [[ ${words[i]} == @(show|bugs|select|limit|unmerge|status|clone|done|reopen|archive|unarchive|retitle|summary|submitter|reassign|found|notfound|fixed|notfixed|block|unblock|merge|forcemerge|tags|affects|user|usertags|claim|unclaim|severity|forwarded|notforwarded|package|owner|noowner|subscribe|unsubscribe|reportspam|spamreport|cache|cleancache|by|with) ]]; then
            special=${words[i]}
            break
        fi
        if [[ ${words[i]} == @(+|-|=) ]]; then
            punctuation=${words[i]}
        fi
    done

    if [[ -n $special ]]; then

    # The command separator must be surrounded by white space.
    if [[ "$cur" == @(,|.) ]]; then
        COMPREPLY=( $cur )
        return 0
    fi

    case $special in
        show|bugs)
            # bugs/show supports a few limited options
            # but as args we accept bug ids, package names and release-critical
            if [[ "$cur" == -* ]]; then
                COMPREPLY=( $( compgen -W '-o --offline --online -m --mbox \
                    --no-cache --cache' -- "$cur" ) )
            elif [[ "$cur" == release-critical/* ]]; then
                local _pkg=${cur#release-critical/}
                COMPREPLY=( $( _suggest_packages "$_pkg" | sed -e's!^!release-critical/!' ) )
            else
                COMPREPLY=( $( compgen -W 'release-critical RC' -- "$cur" ) \
                    $( _suggest_bugs "$cur" ) \
                    $( _suggest_packages "$cur" ) )
            fi
            return 0
            ;;
        status)
            # we accept "verbose" and bug ids
            COMPREPLY=( $( compgen -W 'verbose' -- "$cur" ) \
                $( _suggest_bugs "$cur" ) )
            return 0
            ;;
        clone)
            # we accept 1 bug id and then generate new clone ids
            if [[ "$prev" == +([0-9]) ]]; then
                COMPREPLY=( $( compgen -W '-1' -- "$cur" ) )
            elif [[ "$prev" == -+([0-9]) ]]; then
                local -i j
                (( j=$prev-1 ))
                COMPREPLY=( $( compgen -W $j -- "$cur" ) )
            else
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            fi
            return 0
            ;;
        done|found|notfound|fixed|notfixed)
            # Try to guess the version 
            if [[ "$prev" == +([0-9]) ]]; then
                local _versions=$( _get_version_from_bug $prev )
                if [[ -n $_versions ]]; then
                    COMPREPLY=( $( compgen -W $_versions -- "$cur" ) )
                else
                    COMPREPLY=( )
                fi
            else
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            fi
            return 0
            ;;
        reopen|claim|unclaim|owner|subscribe|unsubscribe)
            if [[ "$prev" == +([0-9]) && -n $DEBEMAIL ]]; then
                COMPREPLY=( $( compgen -W $DEBEMAIL -- "$cur" ) )
            else
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            fi
            return 0
            ;;
        reassign)
            # Must have at least one bug id.
            # Once we have a package name, all that remains is an optional version.
            if [[ "$prev" == $special ]]; then
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            elif [[ "$prev" == +([0-9]) ]]; then
                COMPREPLY=( $( _suggest_bugs "$cur" ) \
                $( _suggest_packages "$cur" ) )
            else
                local _versions=$( _get_version_from_package $prev )
                COMPREPLY=( $( compgen -W $_versions -- "$cur" ) )
            fi
            return 0
            ;;
        block|unblock)
            # Must have at least one bug id.
            if [[ "$prev" == $special ]]; then
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            elif [[ "$prev" == +([0-9]) ]]; then
                COMPREPLY=( $( compgen -W 'by with' -- "$cur" ) )
            else
                COMPREPLY=( )
            fi
            return 0
            ;;
        unmerge|forwarded|notforwarded|noowner)
            # Must have at most one bug id.
            if [[ "$prev" == $special ]]; then
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            else
                COMPREPLY=( )
            fi
            return 0
            ;;
        tags)
            # Must have one bug id.
            if [[ "$prev" == $special ]]; then
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            elif [[ -n $punctuation ]]; then
                # The official list is mirrored
                # https://www.debian.org/Bugs/server-control#tag
                # in the variable @gTags; we copy it verbatim here.
                COMPREPLY=( $( compgen -W 'patch wontfix moreinfo unreproducible help pending security upstream confirmed fixed fixed-upstream fixed-in-experimental d-i ipv6 lfs l10n potato woody sarge sarge-ignore etch etch-ignore lenny lenny-ignore squeeze squeeze-ignore wheezy wheezy-ignore jessie jessie-ignore sid experimental' -- "$cur" ) )
            else
                COMPREPLY=()
                COMPREPLY[0]='= '
                COMPREPLY[1]='+ '
                COMPREPLY[2]='- '
            fi
            return 0
            ;;
        affects)
            # Must have one bug id.
            if [[ "$prev" == $special ]]; then
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            elif [[ -n $punctuation ]]; then
                COMPREPLY=( $( _suggest_packages "$cur" ) )
            else
                COMPREPLY=()
                COMPREPLY[0]='= '
                COMPREPLY[1]='+ '
                COMPREPLY[2]='- '
            fi
            return 0
            ;;
        user)
            if [[ "$prev" == $special && -n $DEBEMAIL ]]; then
                COMPREPLY=( $( compgen -W $DEBEMAIL -- "$cur" ) )
            else
                COMPREPLY=( )
            fi
            return 0
            ;;
        usertags)
            # Must have one bug id.
            if [[ "$prev" == $special ]]; then
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            elif [[ -z $punctuation ]]; then
                COMPREPLY=()
                COMPREPLY[0]='= '
                COMPREPLY[1]='+ '
                COMPREPLY[2]='- '
            else 
                COMPREPLY=()
            fi
            return 0
            ;;
        severity)
            if [[ "$prev" == $special ]]; then
                COMPREPLY=( $( _suggest_bugs "$cur" ) )
            elif [[ "$prev" == +([0-9]) ]]; then
                COMPREPLY=( $( compgen -W 'wishlist minor normal important serious \
                    grave critical' -- "$cur" ) )
            else
                COMPREPLY=()
            fi
            return 0
            ;;
        select|limit)
            # can't handle ":". Give up for now.
            COMPREPLY=( )
            return 0
            ;;
        package)
            COMPREPLY=( $( _suggest_packages "$cur" ) )
            return 0
            ;;
        cache)
            # cache supports a few limited options
            # but as args we accept bug ids, package names and release-critical
            if [[ "$prev" == --cache-mode ]]; then
                COMPREPLY=( $( compgen -W 'min mbox full' -- "$cur" ) )
            elif [[ "$cur" == release-critical/* ]]; then
                local _pkg=${cur#release-critical/}
                COMPREPLY=( $( _suggest_packages "$_pkg" | sed -e's!^!release-critical/!' ) )
            elif [[ "$cur" == -* ]]; then
                COMPREPLY=( $( compgen -W '--cache-mode --force-refresh -f \
                    --include-resolved -q --quiet' -- "$cur" ) )
            else
                COMPREPLY=( $( compgen -W 'release-critical RC' -- "$cur" ) \
                    $( _suggest_packages "$cur" ) )
            fi
            return 0
            ;;
        cleancache)
            if [[ "$prev" == $special ]]; then
                COMPREPLY=( $( compgen -W 'ALL' -- "$cur" ) \
                    $( _suggest_bugs "$cur" ) \
                    $( _suggest_packages "$cur" ) )
            else
                COMPREPLY=( )
            fi
            return 0
            ;;
        *)
            COMPREPLY=( $( _suggest_bugs "$cur" ) )
            return 0
            ;;
        esac
    fi
        
    case $prev in
        --cache-mode)
             COMPREPLY=( $( compgen -W 'min mbox full' -- "$cur" ) )
             return 0
             ;;
        --cache-delay)
             COMPREPLY=( $( compgen -W '5 60 120 240 600' -- "$cur" ) )
             return 0
             ;;
    esac

    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W '-o --offline --online -n --no-action --cache --no-cache --cache-mode --cache-delay --mbox --no-use-default-cc --mutt --no-mutt -f --force-refresh --no-force-refresh --only-new --include-resolved --no-include-resolved --no-ack --ack -i --interactive --force-interactivei --no-interactive -q --quiet' -- "$cur" ) )
    else
        COMPREPLY=( $( compgen -W 'show bugs unmerge select status clone done reopen archive unarchive retitle summary submitter reassign found notfound fixed notfixed block unblock merge forcemerge tags affects user usertags claim unclaim severity forwarded notforwarded package limit owner noowner subscribe unsubscribe reportspam spamreport cache cleancache version help' -- "$cur" ) )
    fi

    # !!! not handled !!!
    # --mailreader=READER
    # --cc-addr=CC_EMAIL_ADDRESS
    # --use-default-cc
    # --sendmail=SENDMAILCMD
    # --smtp-host=SMTPHOST
    # --smtp-username=USERNAME
    # --smtp-password=PASSWORD
    # --smtp-helo=HELO
    # --bts-server
    # --no-conf, --noconf
    #
    # anything with colons for now
    # for similar reasons having issues with tags XXXX = 
    # no special handling for select

    return 0
} &&
complete -F _bts bts


# Local variables:
# coding: utf-8
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# End:
# vim: fileencoding=utf-8 filetype=sh expandtab shiftwidth=4 :