clush

# clush bash completion
#
# to install in /usr/share/bash-completion/completions/ or ~/.local/share/bash-completion/completions/
_clush_command_or_file() {
	# undo our nospace setting...
	compopt +o nospace

	# complete either files (copy mode) or commands (if target set)
	case "$target_set,$mode" in
	*,copy)
		# available since bash-completion 2.12
		if declare -F _comp_compgen_filedir >/dev/null; then
			_comp_compgen_filedir
		else
			_filedir
		fi
		;;
	1,command)
		# available since bash-completion 2.12
		if declare -F _comp_command_offset >/dev/null; then
			_comp_command_offset "$i"
		else
			_command_offset "$i"
		fi
		;;
	esac
}

_clush()
{
	# shellcheck disable=SC2034 # set/used by _init_completion
	local cur prev words cword split
	local i word options="" compopts="" skip=argv0 groupsource="" cleangroup=""
	local mode=command target_set=""

	_init_completion -s -n : || return

	# stop parsing if there had been any non-option before (or --)
	for i in "${!words[@]}"; do
		word="${words[i]}"
		case "$skip" in
		"") ;;
		groupsource)
			groupsource="$word"
			;& # fallthrough
		*)
			skip=""
			continue
			;;
		esac
		case "$word" in
		"") ;;
		--)
			i=$((i+1))  # command from next word!
			_clush_command_or_file
			return
			;;
		-c|--copy|--rcopy) mode=copy;;
		-w|-g|--group) target_set=1; skip=any;;
		# no-arg options
		--version|-h|--help|-n|--nostdin|-a|--all|-q|--quiet|\
		-v|--verbose|-d|--debug) ;;
		# get source separately...
		--groupsource=*) groupsource="${word#*=}";;
		-s|--groupsource) skip=groupsource;;
		# assume all the rest as options...
		# options with = included in word
		--*=*) ;;
		-*) skip=any;;
		*)
			# likely non-option, in copy mode options like -w can come
			# later so just skip, otherwise likely start of command
			[ "$mode" = copy ] && continue
			_clush_command_or_file
			return;;
		esac
	done

	case "$prev" in
	-w|-x|-g|--group|-X)
		case "$cur" in
		*:*)
			groupsource="${cur%%:*}"
			groupsource="${groupsource#@}"
			;;
		*)
			if [ -n "$groupsource" ]; then
				cleangroup=1
			fi
			;;
		esac
		if [ "$prev" = "-w" ]; then
			compopts="@*"  # include all nodes
		fi
		# shellcheck disable=SC2086 ## $compopts expanded on purpose
		options="$(cluset ${groupsource:+-s "$groupsource"} --completion $compopts)"
		if [ -n "$cleangroup" ]; then
			options=${options//@"$groupsource":/@}
		fi
		case "$prev" in
		-g|--group|-X)
			options=${options//@/}
			;;
		esac
		;;
	-s|--groupsource)
		options=$(cluset --groupsources --quiet)
		;;
	--color)
		options="never always auto"
		;;
	-R|--worker)
		options="ssh exec rsh"
		;;
	# no-arg options
	--version|-h|--help|-n|--nostdin|-a|--all|-q|--quiet|\
	-v|--verbose|-d|--debug|-c|--copy|--rcopy) ;;
	# any other option: ignore next word (likely argument)
	-*)
		return;;
	esac
	# new option or no option:
	if [ -z "$options" ]; then
		case "$cur" in
		-*)
			# starts with dash - get all options from help text...
			options="$(clush --help | grep -oP -- '(?<=[ \t])(-[a-z]|--[^= \t]*)')"
			;;
		*)
			# otherwise complete command or file if appropriate and stop here
			_clush_command_or_file
			return
		esac
	fi

	# append space for everything that doesn't end in `:` (likely a groupsource)
	mapfile -t COMPREPLY < <(compgen -W "$options" -- "$cur" | sed -e 's/[^:]$/& /')
	# remove the prefix from COMPREPLY if $cur contains colons and
	# COMP_WORDBREAKS splits on colons...
	__ltrim_colon_completions "$cur"
} && complete -o nospace -F _clush "${BASH_SOURCE##*/}"