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# nmcli(1) completion

_nmcli_array_delete_at()
{
    eval "local ARRAY=(\"\${$1[@]}\")"
    local i
    local tmp=()
    local lower=$2
    local upper=${3:-$lower}

    # for some reason the following fails. So this clumsy workaround...
    #   A=(a "")
    #   echo " >> ${#A[@]}"
    #    >> 2
    #   A=("${A[@]:1}")
    #   echo " >> ${#A[@]}"
    #    >> 0
    # ... seriously???

    for i in "${!ARRAY[@]}"; do
        if [[ "$i" -lt "$2" || "$i" -gt "${3-$2}" ]]; then
            tmp=("${tmp[@]}" "${ARRAY[$i]}")
        fi
    done
    eval "$1=(\"\${tmp[@]}\")"
}

_nmcli()
{
    local cur prev words cword i output
    _init_completion || return

    # we don't care about any arguments after the current cursor position
    # because we only parse from left to right. So, if there are some arguments
    # right of the cursor, just ignore them. Also don't care about ${words[0]}.
    _nmcli_array_delete_at words $((cword+1)) ${#words[@]}
    _nmcli_array_delete_at words 0

    # _init_completion returns the words with all the quotes and escaping
    # characters. We don't care about them, drop them at first.
    for i in ${!words[@]}; do
        words[i]="$(printf '%s' "${words[i]}" | xargs printf '%s\n' 2>/dev/null || true)"
    done

    # In case the cursor is not at the end of the line,
    # $cur consists of spaces that we want do remove.
    # For example: `nmcli connection modify id  <TAB>  lo`
    if [[ "$cur" =~ ^[[:space:]]+ ]]; then
        cur=''
    fi

    output="$(nmcli --complete-args "${words[@]}" 2>/dev/null)"

    # Bail out early if we're completing a file name
    if [ $? = 65 ]; then
        compopt -o default
        COMPREPLY=()
        return 0
    fi

    local IFS=$'\n'
    COMPREPLY=( $( compgen -W '$output' -- $cur ) )

    # Now escape special characters (spaces, single and double quotes),
    # so that the argument is really regarded a single argument by bash.
    # See http://stackoverflow.com/questions/1146098/properly-handling-spaces-and-quotes-in-bash-completion
    local escaped_single_quote="'\''"
    local i=0
    local entry
    for entry in ${COMPREPLY[*]}
    do
        if [[ "${cur:0:1}" == "'" ]]; then
            # started with single quote, escaping only other single quotes
            # [']bla'bla"bla\bla bla --> [']bla'\''bla"bla\bla bla
            COMPREPLY[$i]="${entry//\'/${escaped_single_quote}}"
        elif [[ "${cur:0:1}" == '"' ]]; then
            # started with double quote, escaping all double quotes and all backslashes
            # ["]bla'bla"bla\bla bla --> ["]bla'bla\"bla\\bla bla
            entry="${entry//\\/\\\\}"
            entry="${entry//\"/\\\"}"
            entry="${entry//!/\"\\!\"}"
            COMPREPLY[$i]="$entry"
        else
            # no quotes in front, escaping _everything_
            # [ ]bla'bla"bla\bla bla --> [ ]bla\'bla\"bla\\bla\ bla
            entry="${entry//\\/\\\\}"
            entry="${entry//\'/\'}"
            entry="${entry//\"/\\\"}"
            entry="${entry// /\\ }"
            entry="${entry//\(/\\(}"
            entry="${entry//)/\\)}"
            entry="${entry//!/\\!}"
            entry="${entry//&/\\&}"
            COMPREPLY[$i]="$entry"
        fi
        (( i++ ))
    done

    # Work-around bash_completion issue where bash interprets a colon
    # as a separator.
    # Colon is escaped here. Change "\\:" back to ":".
    # See also:
    # http://stackoverflow.com/questions/28479216/how-to-give-correct-suggestions-to-tab-complete-when-my-words-contains-colons
    # http://stackoverflow.com/questions/2805412/bash-completion-for-maven-escapes-colon/12495727
    i=0
    for entry in ${COMPREPLY[*]}
    do
        entry="${entry//\\\\:/:}"
        COMPREPLY[$i]=${entry}
        (( i++ ))
    done

} &&
complete -F _nmcli nmcli

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