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#!/bin/sh
set -C -f
IFS="$(printf '%b_' '\n')"
IFS="${IFS%_}"
PREVIEW_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/lf"
PREVIEW_WIDTH=600 # px
chafafunc() {
chafa -f sixel -O 0 --polite on -c full --color-space din99d -w 9 -t 0.8 --size "$(($1 -2))"x
}
# PrefixGen: generates a hash prefix for the given file
# This is a unique identifier for the file to preview
PrefixGen() {
# The file path is hashed instead of the file itself since large files
# can take a long time to hash and the file path is usually enough to
# uniquely identify the file. Also, the suffix is used to determine if
# the preview is outdated (which removes the need to hash the file).
readlink -f "$1" | sha256sum | cut -d' ' -f1
}
# SuffixGen: generates a hash suffix for the given file
# This suffix is used to determine if the preview is outdated
SuffixGen() {
stat -Lc "%Y" "$1"
}
# Prevent recursive thumbnails (if the file ends in .six)
[ "${1##*.}" = "six" ] && cat "$1" && exit 1
case "$(file --dereference --brief --mime-type -- "$1")" in
text/html)
lynx -width="$4" -display_charset=utf-8 -dump "$1"
;;
text/troff)
man ./ "$1" | col -b
;;
text/* | */xml | application/json | application/x-ndjson)
bat --terminal-width "$(($4 - 2))" -f "$1"
;;
audio/* | application/octet-stream)
mediainfo "$1" || exit 1
;;
font/* | application/vnd.ms-opentype)
PREVIEW_TEXT="ABCDEFGHIJKLMNOPQRSTUBWXYZ\n""\
abcdefghijklmnopqrstuvwxyz\n""\
1234567890\n""\
!@#$\%(){}[]-+=_\`~"
convert -size "600x412" xc:'#ffffff' \
-gravity center -pointsize 28 \
-font "$1" \
-fill '#000000' \
-annotate +0+0 "$PREVIEW_TEXT" \
-flatten tiff:- | chafafunc $4
;;
image/vnd.djvu)
djvused "$1" -e 'select 1; save-page-with /dev/stdout' |
convert djvu:- jpeg:- | chafafunc $4
;;
image/webp)
dwebp "$1" -tiff -o - | chafafunc $4
;;
image/heic)
convert "$1" jpeg:- | chafafunc $4
;;
image/*)
cat "$1" | chafafunc $4
;;
*/pdf)
pdftocairo -singlefile -scale-to-x $PREVIEW_WIDTH -scale-to-y -1 -jpeg "$1" - | chafafunc $4
;;
video/*)
prefix="$(PrefixGen "$1")"
suffix="$(SuffixGen "$1")"
filename="$prefix-$suffix"
ffmpegthumbnailer -i "$1" -s 0 -c jpeg -f -o - | chafafunc $4
;;
application/*zip)
atool --list -- "$1"
;;
*spreadsheetml.sheet)
xlsx2csv -s 1 "$1" | bat --terminal-width "$(($4 - 2))" -l 'csv'
;;
*opendocument*)
odt2txt "$1"
;;
application/pgp-encrypted)
gpg -d -- "$1"
;;
esac
exit 1
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