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@mintyleaf
Last active April 19, 2023 19:52
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lf (maybe ranger too) media w3m-img preview script

lf media preview script

lf (maybe ranger too) media w3m-img preview script
supports audio (aplay), video (thumbnails through ffmpeg), and, of course, images
based on github.com/gokcehan/lf/wiki/Previews script

installation

put pv.sh in ~/.config/lf/pv.sh
add to lfrc:
map i $~/.config/lf/pv.sh $f

usage

use i on supported media file to preview it
use i on folder to preview supported folder content
use h, j to scroll files back, k, l to scroll forward
use q to exit

enjoy!

#!/usr/bin/env bash
# based on github.com/gokcehan/lf/wiki/Previews
# thanks to dylanaraps for bash bible
# a margin in pixels needed to prevent image from overlapping top title
SAFE_MARGIN=56
# a threshhold for upscaling images, like pixelart or so
NOFILTER_THRESH=256
# dylan dirname fn
dirname() {
local tmp=${1:-.}
[[ $tmp != *[!/]* ]] && {
printf '/\n'
return
}
tmp=${tmp%%"${tmp##*[!/]}"}
[[ $tmp != */* ]] && {
printf '.\n'
return
}
tmp=${tmp%/*}
tmp=${tmp%%"${tmp##*[!/]}"}
printf '%s\n' "${tmp:-/}"
}
clear_screen() {
printf '\e[%sH\e[9999C\e[1J%b\e[1;%sr' \
"$((LINES-2))" "${TMUX:+\e[2J}" "$max_items"
}
show_smth() {
# print three dots while processing stuff
clear
printf '\e['$(($COLUMNS / 2 - 1))'C'...
# process according to mime
mime_type=$(file -bi "$1")
case $mime_type in
image/*)
IMG=${CACHE:-$1}
;;
video/*)
clear
ffmpeg -hide_banner -y -i ${CACHE:-$1} -ss 00:00:01.000 -vframes 1 /tmp/thumb.png
clear
sleep 0.1
IMG="/tmp/thumb.png"
;;
audio/*)
clear
shopt -s checkwinsize; (:;:)
printf '\e['$(($COLUMNS / 2 - ${#1} / 2))'C'$1'\n\n\e[?25l'
aplay ${CACHE:-$1} & read -N 1 KEY && kill $!
clear
printf '\e['$(($COLUMNS / 2 - 1))'C'...
sleep 0.1
return 1
;;
*) return 1
esac
w3m_paths=(/usr/{local/,}{lib,libexec,lib64,libexec64}/w3m/w3mi*)
read -r w3m _ < <(type -p w3mimgdisplay "${w3m_paths[@]}")
read -r LINES COLUMNS < <(stty size)
# Get terminal window size in pixels and set it to WIDTH and HEIGHT.
export $(xdotool getactivewindow getwindowgeometry --shell)
# Get the image size in pixels.
read -r img_width img_height < <("$w3m" <<< "5;$IMG")
orwidth=$img_width
orheight=$img_height
# resize image to fit the one of bigger dims
((HEIGHT > WIDTH)) && {
((img_height=img_height*WIDTH/img_width))
((img_width=WIDTH))
}
((WIDTH > HEIGHT)) && {
((img_width=img_width*HEIGHT/img_height))
((img_height=HEIGHT))
}
# if image is very long, avoid overdrawing
((img_width > WIDTH)) && {
((img_height=img_height*WIDTH/img_width))
((img_width=WIDTH))
}
((img_height > HEIGHT)) && {
((img_width=img_width*HEIGHT/img_height))
((img_height=HEIGHT))
}
# safe margins for title showing
((img_height > $SAFE_MARGIN*2 && img_width > $SAFE_MARGIN*2)) && {
((img_width=img_width-$SAFE_MARGIN))
((img_height=img_height-$SAFE_MARGIN))
}
# if we deal with smoll images, like pixelart, avoid blurry upscaling
((orwidth < $NOFILTER_THRESH && orheight < $NOFILTER_THRESH)) && {
convert $IMG -filter box -resize "$img_width"x"$img_height" /tmp/img.png
IMG=/tmp/img.png
}
# variable needed for centering image.
HALF_HEIGHT=$(expr $HEIGHT / 2)
HALF_WIDTH=$(expr $WIDTH / 2)
HALF_IMG_HEIGHT=$(expr $img_height / 2)
HALF_IMG_WIDTH=$(expr $img_width / 2)
X_POS=$(expr $HALF_WIDTH - $HALF_IMG_WIDTH)
Y_POS=$(expr $HALF_HEIGHT - $HALF_IMG_HEIGHT)
clear
# debug positioning
# echo $X_POS $Y_POS $img_width $img_height
# sleep 1
# clear
# hide the cursor.
printf '\e[?25l'
# show the title
shopt -s checkwinsize; (:;:)
printf '\e['$(($COLUMNS / 2 - ${#1} / 2))'C'$1
# display the image in subthread with delay to prevent blinking
(sleep 0.1 && printf '0;1;%s;%s;%s;%s;;;;;%s\n3;\n4\n' \
${X_POS:-0} \
${Y_POS:-0} \
"$img_width" \
"$img_height" \
"$IMG" | "$w3m" &>/dev/null) &
# wait for input
read -N 1 KEY
# clear the image.
printf '6;%s;%s;%s;%s\n3;' \
"${X_POS:-0}" \
"${Y_POS:-0}" \
"$WIDTH" \
"$HEIGHT" | "$w3m" &>/dev/null
clear_screen
}
# get the arg basedir (or dir as arg) contents
DIR_PATH=$(dirname $1)
[ -d $1 ] && DIR_PATH=$1
FILES_RAW=($DIR_PATH/*)
FILES=()
# filter it to only supported mimes
for i in "${FILES_RAW[@]}"; do
mime_type=$(file -bi "$i")
case $mime_type in
image/*|video/*|audio/*)
FILES+=($i)
;;
esac
done
COUNT=${#FILES[@]}
for i in "${!FILES[@]}"; do
if [[ "${FILES[$i]}" = "${1}" ]]; then
POS="${i}"
fi
done
[ -z $POS ] && POS=0
show_smth ${FILES[$POS]}
# cycle through contents array
while true
do
case $KEY in
"h"|"j")
POS=$((POS-1))
[ $POS -lt 0 ] && POS=$((COUNT-1))
show_smth ${FILES[$POS]}
;;
"k"|"l")
POS=$((POS+1))
[ $POS -eq $COUNT ] && POS=0
show_smth ${FILES[$POS]}
;;
*)
exit 0
esac
done
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