bash completion scripts

acd_cli_bash_completion

_acd_cli()
{
    COMPREPLY=()
    local CURR=${COMP_WORDS[COMP_CWORD]}
    local PREV=${COMP_WORDS[COMP_CWORD-1]}
    local COMMAND=${COMP_WORDS[1]}
    local COMPLETEDARGNUM=$((COMP_CWORD - 2))
    

    _acd_cli_in_set() { # checks if $1 is equal to any of the following parameters
	local TEST="$1"
	while shift ; do
	    if [[ "$TEST" == "$1" ]] ; then
		return 0;
	    fi
	done
	return 1;
    }

    _acd_cli_escape_string() # thanks to http://unix.stackexchange.com/a/32396
    {
	local qs=${1//\\//\\\\}
	for c in \[ \] \( \) \. \^ \$ \? \* \+; do
	    qs=${qs//"$c"/"\\$c"}
	done
	echo $qs
    }
    
    _acd_cli_complete_remote() # $1 is a filter appended to the end of the grep command while listing the remote files
    {
	local LIST CMD
	if [ -n "$CURR" ] ; then
	    if echo "$CURR" | egrep -q '/$' ; then
		LIST=$CURR
	    else
		LIST=$(dirname "$CURR")
		test "$LIST" == "/" || LIST="$LIST/"
	    fi
	    local FILTER=`_acd_cli_escape_string "$CURR"`
	    # commands in a pipe are executed in a subshell and don't modify the parent shell, DO NOT USE A PIPE
	    mapfile -t CMD < <(acd_cli ls "$LIST" 2>/dev/null | sed -e "s#^[^ ]* [^ ]* \(.*\)#$LIST\1#" 2>/dev/null | egrep "$FILTER.*$1" 2>/dev/null )
	else
	    CMD=("/")
	fi
	COMPREPLY=("${CMD[@]}")
	compopt -o filenames
	
	if [[  "${#COMPREPLY[@]}" -eq 1 && "${COMPREPLY[0]}" = */ ]] ; then
	    compopt -o nospace
	fi
	if [[  "${#COMPREPLY[@]}" -eq 0 && "${CURR}" = */ ]] ; then
	    COMPREPLY[0]="$CURR"
	    compopt +o filenames
	fi
	return 0
    }

    # complete with the command (1st parameter after the program name)
    if _acd_cli_in_set "$PREV" acd_cli acdcli ; then
	test "$COMP_CWORD" -gt 1 && return 0
	local CMD="add-child cat children clear-cache create download find find-md5 find-regex list-trash metadata mount move overwrite quota remove-child rename resolve restore stream sync trash tree umount upload usage version ls dir mkdir"
    	COMPREPLY=($(compgen -W "${CMD}" -- "$CURR"))
	return 0
    fi

    # stop completions for commands with no extra parameters
    if _acd_cli_in_set "$COMMAND" version clear-cache list-trash usage quota; then
	return 0
    fi

    # commands which accept only 1 remote dir
    if _acd_cli_in_set "$COMMAND" ls dir children ; then
	if [[ "$COMPLETEDARGNUM" == 0 ]] ; then
	    _acd_cli_complete_remote '/$'
	fi
	return 0
    fi

    # commands which accept only 1 remote location
    if _acd_cli_in_set "$COMMAND" trash rm cat ; then
	if [[ "$COMPLETEDARGNUM" == 0 ]] ; then
	    _acd_cli_complete_remote ''
	fi
	return 0
    fi
    
    # commands which accept only 1 local dir
    if _acd_cli_in_set "$COMMAND" mount umount ; then
	if [[ "$COMPLETEDARGNUM" == 0 ]] ; then
	    compopt -o dirnames
	fi
	return 0
    fi

    # commands with "remote" "local dir" parameters
    if _acd_cli_in_set "$COMMAND" download dl ; then
	case "$COMPLETEDARGNUM" in
	    0) _acd_cli_complete_remote ''
	       ;;
	    1) compopt -o dirnames
	       ;;
	esac
	return 0
    fi

    # commands with "local" "remote dir" parameters
    if _acd_cli_in_set "$COMMAND" upload ul ; then
	case "$COMPLETEDARGNUM" in
	    0) compopt -o default
	       ;;
	    1) _acd_cli_complete_remote '/$'
	       ;;
	esac
	return 0
    fi

    compopt -o default
    return 0
}

complete -F _acd_cli acd_cli
complete -F _acd_cli acdcli