#!/bin/sh

usage () {
	cat <<EOF>&2
Usage: ${0##*/} FILES

Preview FILES:

- If folder, list it.

- For text files, media files and other files supported by ranger's "scope.sh",
  use the script to preview the file.

- For other files, display some file information.

EOF
}

[ $# -lt 1 ] && usage && return 1
[ "$1" = "-h" ] && usage && return
[ "$1" = "--" ] && shift

ls="ls -1 --color=always"
if test -t 0; then
	ls="$ls --indicator-style=classify"
fi
if [ "$(uname -o)" = "GNU/Linux" ]; then
	ls="$ls  --group-directories-first"
fi

## scope.sh.
XDG_CONFIG_HOME=${XDG_CONFIG_HOME:-~/.config}
scope="$XDG_CONFIG_HOME/ranger/scope.sh"
if [ ! -x "$scope" ]; then
	XDG_DATA_DIRS=${XDG_DATA_DIRS:-"/usr/local/share"}
	scope="$XDG_DATA_DIRS/doc/ranger/config/scope.sh"
	if [ ! -x "$scope" ]; then
		scope="/usr/share/doc/ranger/config/scope.sh"
	fi
fi

## Several files must share the screen space.
lines=$(expr $(tput lines) / $#)
[ $lines -lt 1 ] && lines=1

_preview() {
	## Folders.
	[ -d "$1" ] && $ls "$1" && return

	buf=$("$scope" "$1" $(tput cols) $lines 2>/dev/null)
	status=$?

	case $status in
	1)
		break ;;
	2)
		## Text files
		sed ${lines}q "$1"
		return ;;
	*)
		echo "$buf" | sed ${lines}q
		return ;;
	esac

	## All files.
	path="$1"
	[ ! -e "$path" ] && path=$(command -v "$1")
	[ ! -e "$path" ] && return
	$ls -l "$path"
	file "$path" | cut -d':' -f2 | cut -b 2-
	if command -v pacman >/dev/null 2>&1; then
		pacman -Qo "$path" 2>/dev/null
	fi
}

[ $# -eq 1 ] && _preview "$1" && exit

for i; do
	## GNU head uses this echo when outputting multiple files.
	echo "==> $i <=="
	_preview "$i"
done