# Unset possible system-defined aliases.
unalias l ll lll llll la lla &> /dev/null
unset l ll lll llll la lla &> /dev/null

# List files in dirs.
# Current dir by default.
# Usage: l [DIRS]
function l() {
	ls -lhv --si --group-directories-first -- "$@"
}

# List last modified files first.
# Current dir by default.
# Usage: ll [DIRS]
function ll() {
	ls -lhvtr --si -- "$@"
}

# List files in tree structure.
# Current dir by default.
# Depth can be omitted by passing `-` (dash).
# Usage: lll [DEPTH] [DIRS]
function lll() {
	local IFS=$'\n'
	local depth="${1}"
	local target=("${@:2}")

	[[ "${target}" = "" ]] && target="."
	[[ "${depth}" = "" ]] && depth=666
	[[ "${depth}" = "-" ]] && depth=666

	tree -a -L "${depth}" -- "${target[@]}"
}

# List files recursively.
# Current dir by default.
# Usage: llll [DIRS]
function llll() {
	ls -RlAhv --si --group-directories-first -- "$@"
}

# List all files in dirs, incl. hidden files.
# Current dir by default.
# Usage: la [DIRS]
function la() {
	ls -lAh --si --group-directories-first -- "$@"
}

# List all files in dirs, incl. hidden files, sorted by mtime.
# Current dir by default.
# Usage: lla [DIRS]
function lla() {
	ls -lAhtr --si -- "$@"
}

# List only files.
function _ls_file() {
	ls --classify | grep -v \/$
}

# List only dirs.
function _ls_dir() {
	ls --classify | grep \/$ | sed -e "s/\/$//"
}