#!/bin/bash

set -C -f -u
IFS="$(printf '%b_' '\n')"
IFS="${IFS%_}"

# ANSI color codes are supported.
# STDIN is disabled, so interactive scripts won't work properly

# This script is considered a configuration file and must be updated manually.

# Meanings of exit codes:
# code | meaning    | action of ranger
# -----+------------+-------------------------------------------
# 0    | success    | Display stdout as preview
# 1    | no preview | Display no preview at all
# 2    | plain text | Display the plain content of the file

# Script arguments
FILE_PATH="${1}" # Full path of the highlighted file
FILE_EXTENSION="${FILE_PATH##*.}"
FILE_EXTENSION_LOWER=$(echo "${FILE_EXTENSION}" | tr '[:upper:]' '[:lower:]')

handle_extension() {
	case "${FILE_EXTENSION_LOWER}" in
	# Archive
	a | ace | alz | arc | arj | bz | bz2 | cab | cpio | deb | gz | jar | lha | lz | lzh | lzma | lzo | \
		rpm | rz | t7z | tar | tbz | tbz2 | tgz | tlz | txz | tZ | tzo | war | xpi | xz | Z | zip)
		unzip -l -- "${FILE_PATH}"
		tar --list --file "${FILE_PATH}"
		exit 1
		;;
	rar)
		# Avoid password prompt by providing empty password
		unrar lt -p- -- "${FILE_PATH}"
		exit 1
		;;
	7z)
		# Avoid password prompt by providing empty password
		7z l -p -- "${FILE_PATH}"
		exit 1
		;;

	# PDF
	pdf)
		# Preview as text conversion
		pdftotext -l 10 -nopgbrk -q -- "${FILE_PATH}" -
		exiftool "${FILE_PATH}"
		exit 1
		;;

	# BitTorrent
	torrent)
		transmission-show -- "${FILE_PATH}"
		exit 1
		;;

	# HTML
	htm | html | xhtml)
		# Preview as text conversion
		lynx -dump -nonumbers -nolist -- "${FILE_PATH}"
		elinks -dump 1 -no-references -no-numbering <"${FILE_PATH}"
		;; # Continue with next handler on failure

	# JSON
	json)
		jq --color-output . "${FILE_PATH}" && exit 5
		python -m json.tool -- "${FILE_PATH}" && exit 5
		;;
	esac
}

handle_mime() {
	local mimetype="${1}"
	case "${mimetype}" in
	text/html) lynx -dump "${FILE_PATH}" ;;
	text/troff) man ./ "${FILE_PATH}" | col -b ;;
	text/* | */xml)
		bat --color always --style plain --paging never -- "${FILE_PATH}"
		exit 2
		;;
	application/zip) unzip -l -- "${FILE_PATH}" ;;
	image/*) exiftool "${FILE_PATH}" || exit 1 ;;
	video/* | audio/* | application/octet-stream) mediainfo "${FILE_PATH}" || exit 1 ;;
	*/pdf) pdftotext -l 10 -nopgbrk -q -- "${FILE_PATH}" - ;;
	esac
}

handle_fallback() {
	echo '----- File Type Classification -----' && file --dereference --brief -- "${FILE_PATH}"
	exit 1
}

MIMETYPE="$(file --dereference --brief --mime-type -- "${FILE_PATH}")"
handle_extension
handle_mime "${MIMETYPE}"
handle_fallback

exit 1