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|
#!/usr/bin/env sh
# Description: File preview
#
# Dependencies:
# - Image preview: chafa
# - PDF preview: poppler-utils
# - Video thumbnail preview: ffmpegthumbnailertar
#
# Usage:
# When sff is running inside tmux:
# Enabling preview will split a new pane for display.
#
# When sff is running outside tmux:
# If SFF_PV_TERM is set, enabling preview will launch the terminal emulator
# specified by this variable as the previewer.
#
# If SFF_PV_TERM is not set, enabling preview will prompt you to enter
# the name of a terminal emulator to use temporarily as the previewer.
#
# The SFF_PV_TERM environment variable defines the default terminal emulator
# to be used as the previewer. You can set SFF_PV_TERM like this:
# $ export SFF_PV_TERM=xterm
#
# Note: This plugin cannot handle paths containing line breaks.
#
# Shell: POSIX compliant
#
# Author: Shi Yanling
sffpipe=$1
sffdir=${sffpipe%/*}
pvfifo="${sffpipe}.pv"
tmpdir=${TMPDIR:-/tmp}
[ ! -w "$tmpdir" ] && tmpdir=$sffdir
tmppvfile="${tmpdir}/sff-tmppv-$(id -u)"
preview_loop_tui()
{
mkfifo "$pvfifo" || exit 0
while IFS='' read -r _path; do
while _x=$(timeout 0.005 sh -c 'IFS="" read -r _x && printf "%s" "$_x"'); do
_path=$_x
done
clear
_dest=''
_mime=$(file -bL --mime-type "$_path")
case "$_mime" in
image/*) _dest=$_path
;;
application/pdf) _dest=$tmppvfile
pdftoppm -jpeg -f 1 -singlefile -scale-to 800 "$_path" "$_dest" >/dev/null 2>&1 \
&& _dest="${_dest}.jpg" || _dest=''
;;
video/*) _dest="${tmppvfile}.jpg"
ffmpegthumbnailer -m -s 0 -i "$_path" -o "$_dest" >/dev/null 2>&1 \
|| _dest=''
;;
*) _rows=$(tput lines); _cols=$(tput cols)
case "$_mime" in
text/*) { printf " --- %s ---\n" "$_mime"; head -n "$_rows" "$_path"; } | less -SX +gq
continue ;;
inode/directory) { printf " --- %s --- (%s files)\n" "$_mime" \
$(find "$_path"/ -mindepth 1 -maxdepth 1 ! -name . ! -name .. 2>/dev/null | wc -l); \
ls -1Ap "$_path"; } | head -n "$((_rows - 1))" | cut -c 1-"$_cols"
continue ;;
esac
;;
esac
if [ "$_dest" ]; then
chafa "$_dest"
tput civis
else
printf " --- %s ---" "$_mime"
fi
done <"$pvfifo"
}
check_fifo()
{
if [ -p "$pvfifo" ]; then
rm -f "$pvfifo"
printf "#q" >"$sffpipe"
exit 0
fi
}
wait_for_fifo()
{
_i=1
while [ ! -p "$pvfifo" ]; do
sleep 0.1
_i=$((_i + 1))
[ "$_i" -gt 20 ] && exit 0
done
}
case "$2" in
'tui') check_fifo
if [ "$TMUX" ]; then
[ $(($(tput lines) * 2)) -gt "$(tput cols)" ] && _layout='v' || _layout='h'
tmux split-window -d"$_layout" "$0" "$sffpipe" 'loop'
else
if [ -z "$SFF_PV_TERM" ]; then
printf "\nSFF_PV_TERM: not set\n"
printf "Terminal emulator for preview (empty to cancel): "; read -r _x
[ -z "$_x" ] && exit 0
SFF_PV_TERM=$_x
fi
case "$SFF_PV_TERM" in
'kitty'|'gnome-terminal') "$SFF_PV_TERM" -- "$0" "$sffpipe" 'loop' &
;;
'xfce4-terminal'|'terminator') "$SFF_PV_TERM" -e "\"$0\" \"$sffpipe\" loop" &
;;
*) "$SFF_PV_TERM" -e "$0" "$sffpipe" 'loop' &
;;
esac
fi
wait_for_fifo
printf "#p" >"$sffpipe"
;;
'gui') :
;;
'loop') tput civis
preview_loop_tui
;;
esac
|
