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nnn/plugins/preview-tui
Luuk van Baal 95e1d56ee4
Preview-tui fix image_preview stdout
2022-08-07 16:40:12 +02:00

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#!/usr/bin/env sh
# Description: Terminal based file previewer
#
# Note: This plugin needs a "NNN_FIFO" to work. See man.
#
# Dependencies:
# - Supports 5 independent methods to preview with:
# - tmux (>=3.0), or
# - kitty with allow_remote_control and listen_on set in kitty.conf, or
# - QuickLook on WSL (https://github.com/QL-Win/QuickLook), or
# - Windows Terminal (https://github.com/Microsoft/Terminal | https://aka.ms/terminal) with WSL, or
# - $TERMINAL set to a terminal (it's xterm by default).
# - less or $PAGER
# - tree or exa or ls
# - mediainfo or file
# - mktemp
# - unzip
# - tar
# - man
# - optional: bsdtar or atool for additional archive preview
# - optional: bat for code syntax highlighting
# - optional: ueberzug, kitty terminal, viu or catimg for images
# - optional: convert(ImageMagick) for playing gif preview (required for kitty image previews)
# - optional: ffmpegthumbnailer for video thumbnails (https://github.com/dirkvdb/ffmpegthumbnailer)
# - optional: ffmpeg for audio thumbnails
# - optional: libreoffce for opendocument/officedocument preview
# - optional: pdftoppm(poppler) for pdf thumbnails
# - optional: gnome-epub-thumbnailer for epub thumbnails (https://gitlab.gnome.org/GNOME/gnome-epub-thumbnailer)
# - optional: fontpreview for font preview (https://github.com/sdushantha/fontpreview)
# - optional: djvulibre for djvu
# - optional: glow or lowdown for markdown
# - optional: w3m or lynx or elinks for html
# - optional: set/export ICONLOOKUP as 1 to enable file icons in front of directory previews with .iconlookup
# Icons and colors are configureable in .iconlookup
# - optional: scope.sh file viewer from ranger.
# 1. drop scope.sh executable in $PATH
# 2. set/export $USE_SCOPE as 1
# - optional: pistol file viewer (https://github.com/doronbehar/pistol).
# 1. install pistol
# 2. set/export $USE_PISTOL as 1
#
# Usage:
# You need to set a NNN_FIFO path and a key for the plugin with NNN_PLUG,
# then start `nnn`:
#
# $ nnn -a
#
# or
#
# $ NNN_FIFO=/tmp/nnn.fifo nnn
#
# Then launch the `preview-tui` plugin in `nnn`.
#
# If you provide the same NNN_FIFO to all nnn instances, there will be a
# single common preview window. If you provide different FIFO path (e.g.
# with -a), they will be independent.
#
# The previews will be shown in a tmux split. If that isn't possible, it
# will try to use a kitty terminal split. And as a final fallback, a
# different terminal window will be used ($TERMINAL).
#
# Tmux and kitty users can configure $SPLIT to either "h" or "v" to set a
# 'h'orizontal split or a 'v'ertical split (as in, the line that splits the
# windows will be horizontal or vertical).
#
# Kitty users need something similar to the following in their kitty.conf:
# - `allow_remote_control yes`
# - `listen_on unix:$TMPDIR/kitty`
# - `enabled_layouts splits` (optional)
# With ImageMagick installed, this terminal can use the icat kitten to display images.
# Refer to kitty documentation for further details.
#
# Iterm2 users are recommended to use viu to view images without getting pixelated.
#
# Windows Terminal users can set "Profile termination behavior" under "Profile > Advanced" settings
# to automaticaly close pane on quit when exit code is 0.
#
# Shell: POSIX compliant
# Authors: Todd Yamakawa, Léo Villeveygoux, @Recidiviste, Mario Ortiz Manero, Luuk van Baal, @WanderLanz
#SPLIT="$SPLIT" # you can set a permanent split here
#TERMINAL="$TERMINAL" # same goes for the terminal
SPLIT_SIZE="${SPLIT_SIZE:-50}" # split size in percentage for supported previewers
USE_SCOPE="${USE_SCOPE:-0}"
USE_PISTOL="${USE_PISTOL:-0}"
ICONLOOKUP="${ICONLOOKUP:-0}"
PAGER="${PAGER:-less -P?n -R}"
TMPDIR="${TMPDIR:-/tmp}"
BAT_STYLE="${BAT_STYLE:-numbers}"
BAT_THEME="${BAT_THEME:-ansi}"
# Consider setting NNN_PREVIEWDIR to $XDG_CACHE_HOME/nnn/previews if you want to keep previews on disk between reboots
NNN_PREVIEWDIR="${NNN_PREVIEWDIR:-$TMPDIR/nnn/previews}"
NNN_PREVIEWWIDTH="${NNN_PREVIEWWIDTH:-1920}"
NNN_PREVIEWHEIGHT="${NNN_PREVIEWHEIGHT:-1080}"
NNN_PARENT="${NNN_FIFO#*.}"
[ "$NNN_PARENT" -eq "$NNN_PARENT" ] 2>/dev/null || NNN_PARENT=""
FIFOPID="$TMPDIR/nnn-preview-tui-fifopid.$NNN_PARENT"
PREVIEWPID="$TMPDIR/nnn-preview-tui-pagerpid.$NNN_PARENT"
CURSEL="$TMPDIR/nnn-preview-tui-selection.$NNN_PARENT"
FIFO_UEBERZUG="$TMPDIR/nnn-preview-tui-ueberzug-fifo.$NNN_PARENT"
POSOFFSET="$TMPDIR/nnn-preview-tui-posoffset"
exists() { type "$1" >/dev/null 2>&1 ;}
pkill() { command pkill "$@" >/dev/null 2>&1 ;}
pidkill() { [ -f "$1" ] && kill "$(cat "$1")" >/dev/null 2>&1 ;}
prompt() { printf "%b" "$@"; cfg=$(stty -g); stty raw -echo; head -c 1; stty "$cfg" ;}
start_preview() {
[ "$PAGER" = "most" ] && PAGER="less -R"
if [ -e "${TMUX%%,*}" ] && tmux -V | grep -q '[ -][3456789]\.'; then
TERMINAL=tmux
elif [ -n "$KITTY_LISTEN_ON" ]; then
TERMINAL=kitty
elif [ -z "$TERMINAL" ] && [ "$TERM_PROGRAM" = "iTerm.app" ]; then
TERMINAL=iterm
elif [ -n "$WT_SESSION" ]; then
TERMINAL=winterm
else
TERMINAL="${TERMINAL:-xterm}"
fi
if [ -z "$SPLIT" ] && [ $(($(tput lines) * 2)) -gt "$(tput cols)" ]; then
SPLIT='h'
elif [ "$SPLIT" != 'h' ]; then
SPLIT='v'
fi
case "$TERMINAL" in
tmux) # tmux splits are inverted
if [ "$SPLIT" = "v" ]; then DSPLIT="h"; else DSPLIT="v"; fi
tmux split-window -e "NNN_FIFO=$NNN_FIFO" -e "PREVIEW_MODE=1" -e "CURSEL=$CURSEL" \
-e "TMPDIR=$TMPDIR" -e "FIFOPID=$FIFOPID" -e "POSOFFSET=$POSOFFSET" \
-e "BAT_STYLE=$BAT_STYLE" -e "BAT_THEME=$BAT_THEME" -e "PREVIEWPID=$PREVIEWPID" \
-e "PAGER=$PAGER" -e "ICONLOOKUP=$ICONLOOKUP" -e "NNN_PREVIEWWIDTH=$NNN_PREVIEWWIDTH" \
-e "USE_SCOPE=$USE_SCOPE" -e "SPLIT=$SPLIT" -e "USE_PISTOL=$USE_PISTOL" \
-e "NNN_PREVIEWDIR=$NNN_PREVIEWDIR" -e "NNN_PREVIEWHEIGHT=$NNN_PREVIEWHEIGHT" \
-e "FIFO_UEBERZUG=$FIFO_UEBERZUG" -e "QLPATH=$2" -d"$DSPLIT" -p"$SPLIT_SIZE" "$0" "$1" ;;
kitty) # Setting the layout for the new window. It will be restored after the script ends.
kitty @ goto-layout splits
# Trying to use kitty's integrated window management as the split window. All
# environmental variables that will be used in the new window must be explicitly passed.
kitty @ launch --no-response --title "nnn preview" --keep-focus \
--cwd "$PWD" --env "PATH=$PATH" --env "NNN_FIFO=$NNN_FIFO" \
--env "PREVIEW_MODE=1" --env "PAGER=$PAGER" --env "TMPDIR=$TMPDIR" \
--env "USE_SCOPE=$USE_SCOPE" --env "SPLIT=$SPLIT" --env "TERMINAL=$TERMINAL"\
--env "PREVIEWPID=$PREVIEWPID" --env "FIFO_UEBERZUG=$FIFO_UEBERZUG" \
--env "ICONLOOKUP=$ICONLOOKUP" --env "NNN_PREVIEWHEIGHT=$NNN_PREVIEWHEIGHT" \
--env "NNN_PREVIEWWIDTH=$NNN_PREVIEWWIDTH" --env "NNN_PREVIEWDIR=$NNN_PREVIEWDIR" \
--env "USE_PISTOL=$USE_PISTOL" --env "BAT_STYLE=$BAT_STYLE" \
--env "BAT_THEME=$BAT_THEME" --env "FIFOPID=$FIFOPID" \
--env "CURSEL=$CURSEL" --location "${SPLIT}split" "$0" "$1" ;;
iterm)
command="$SHELL -c 'cd $PWD; \
PATH=\\\"$PATH\\\" NNN_FIFO=\\\"$NNN_FIFO\\\" PREVIEW_MODE=1 PAGER=\\\"$PAGER\\\" \
USE_SCOPE=\\\"$USE_SCOPE\\\" SPLIT=\\\"$SPLIT\\\" TERMINAL=\\\"$TERMINAL\\\" \
PREVIEWPID=\\\"$PREVIEWPID\\\" CURSEL=\\\"$CURSEL\\\" TMPDIR=\\\"$TMPDIR\\\" \
ICONLOOKUP=\\\"$ICONLOOKUP\\\" NNN_PREVIEWHEIGHT=\\\"$NNN_PREVIEWHEIGHT\\\" \
NNN_PREVIEWWIDTH=\\\"$NNN_PREVIEWWIDTH\\\" NNN_PREVIEWDIR=\\\"$NNN_PREVIEWDIR\\\" \
USE_PISTOL=\\\"$USE_PISTOL\\\" BAT_STYLE=\\\"$BAT_STYLE\\\" \
BAT_THEME=\\\"$BAT_THEME\\\" FIFOPID=\\\"$FIFOPID\\\" \\\"$0\\\" \\\"$1\\\"'"
if [ "$SPLIT" = "h" ]; then split="horizontally"; else split="vertically"; fi
osascript <<-EOF
tell application "iTerm"
tell current session of current window
split $split with default profile command "$command"
end tell
end tell
EOF
;;
winterm)
if [ "$SPLIT" = "h" ]; then split="H"; else split="V"; fi
cmd.exe /c wt -w 0 sp -$split -s$((SPLIT_SIZE / 100)) bash -c "cd $PWD \; \
PATH='$PATH' NNN_FIFO=$NNN_FIFO PREVIEW_MODE=1 CURSEL=$CURSEL TMPDIR=$TMPDIR \
FIFOPID=$FIFOPID BAT_STYLE=$BAT_STYLE BAT_THEME=$BAT_THEME PREVIEWPID=$PREVIEWPID \
PAGER='$PAGER' ICONLOOKUP=$ICONLOOKUP NNN_PREVIEWWIDTH=$NNN_PREVIEWWIDTH \
USE_SCOPE=$USE_SCOPE SPLIT=$SPLIT USE_PISTOL=$USE_PISTOL \
NNN_PREVIEWDIR=$NNN_PREVIEWDIR NNN_PREVIEWHEIGHT=$NNN_PREVIEWHEIGHT \
FIFO_UEBERZUG=$FIFO_UEBERZUG QLPATH=$2 $0 $1" \; -w 0 mf previous
;;
*) if [ -n "$2" ]; then
QUICKLOOK=1 QLPATH="$2" PREVIEW_MODE=1 "$0" "$1" &
else
PREVIEWPID="$PREVIEWPID" CURSEL="$CURSEL" PREVIEW_MODE=1 \
FIFOPID="$FIFOPID" FIFO_UEBERZUG="$FIFO_UEBERZUG" $TERMINAL -e "$0" "$1" &
fi ;;
esac
}
toggle_preview() {
if exists QuickLook.exe; then
QLPATH="QuickLook.exe"
elif exists Bridge.exe; then
QLPATH="Bridge.exe"
fi
if pidkill "$FIFOPID"; then
[ -p "$NNN_PPIPE" ] && printf "0" > "$NNN_PPIPE"
pidkill "$PREVIEWPID"
pkill -f "tail --follow $FIFO_UEBERZUG"
if [ -n "$QLPATH" ] && stat "$1"; then
f="$(wslpath -w "$1")" && "$QLPATH" "$f" &
fi
else
[ -p "$NNN_PPIPE" ] && printf "1" > "$NNN_PPIPE"
start_preview "$1" "$QLPATH"
fi
}
fifo_pager() {
cmd="$1"
shift
# We use a FIFO to access $PAGER PID in jobs control
tmpfifopath="$TMPDIR/nnn-preview-tui-fifo.$$"
mkfifo "$tmpfifopath" || return
$PAGER < "$tmpfifopath" &
printf "%s" "$!" > "$PREVIEWPID"
(
exec > "$tmpfifopath"
if [ "$cmd" = "pager" ]; then
if exists bat; then
bat --terminal-width="$cols" --decorations=always --color=always \
--paging=never --style="$BAT_STYLE" --theme="$BAT_THEME" "$@" &
else
$PAGER "$@" &
fi
else
"$cmd" "$@" &
fi
)
rm "$tmpfifopath"
}
# Binary file: show file info inside the pager
print_bin_info() {
printf -- "-------- \033[1;31mBinary file\033[0m --------\n"
if exists mediainfo; then
mediainfo "$1"
else
file -b "$1"
fi
}
handle_mime() {
case "$2" in
image/jpeg) image_preview "$cols" "$lines" "$1" ;;
image/gif) generate_preview "$cols" "$lines" "$1" "gif" ;;
image/vnd.djvu) generate_preview "$cols" "$lines" "$1" "djvu" ;;
image/*) generate_preview "$cols" "$lines" "$1" "image" ;;
video/*) generate_preview "$cols" "$lines" "$1" "video" ;;
audio/*) generate_preview "$cols" "$lines" "$1" "audio" ;;
application/font*|application/*opentype|font/*) generate_preview "$cols" "$lines" "$1" "font" ;;
*/*office*|*/*document*) generate_preview "$cols" "$lines" "$1" "office" ;;
application/zip) fifo_pager unzip -l "$1" ;;
text/troff)
if exists man; then
fifo_pager man -Pcat -l "$1"
else
fifo_pager pager "$1"
fi ;;
*) handle_ext "$1" "$3" "$4" ;;
esac
}
handle_ext() {
case "$2" in
epub) generate_preview "$cols" "$lines" "$1" "epub" ;;
pdf) generate_preview "$cols" "$lines" "$1" "pdf" ;;
gz|bz2) fifo_pager tar -tvf "$1" ;;
md) if exists glow; then
fifo_pager glow -s dark "$1"
elif exists lowdown; then
fifo_pager lowdown -Tterm "$1"
else
fifo_pager pager "$1"
fi ;;
htm|html|xhtml)
if exists w3m; then
fifo_pager w3m "$1"
elif exists lynx; then
fifo_pager lynx "$1"
elif exists elinks; then
fifo_pager elinks "$1"
else
fifo_pager pager "$1"
fi ;;
7z|a|ace|alz|arc|arj|bz|cab|cpio|deb|jar|lha|lz|lzh|lzma|lzo\
|rar|rpm|rz|t7z|tar|tbz|tbz2|tgz|tlz|txz|tZ|tzo|war|xpi|xz|Z)
if exists atool; then
fifo_pager atool -l "$1"
elif exists bsdtar; then
fifo_pager bsdtar -tvf "$1"
fi ;;
*) if [ "$3" = "bin" ]; then
fifo_pager print_bin_info "$1"
else
fifo_pager pager "$1"
fi ;;
esac
}
preview_file() {
clear
# Trying to use pistol if it's available.
if [ "$USE_PISTOL" -ne 0 ] && exists pistol; then
fifo_pager pistol "$1"
return
fi
# Trying to use scope.sh if it's available.
if [ "$USE_SCOPE" -ne 0 ] && exists scope.sh; then
fifo_pager scope.sh "$1" "$cols" "$lines" "$(mktemp -d)" "True"
return
fi
# Use QuickLook if it's available.
if [ -n "$QUICKLOOK" ]; then
stat "$1" && f="$(wslpath -w "$1")" && "$QLPATH" "$f" &
return
fi
# Detecting the exact type of the file: the encoding, mime type, and extension in lowercase.
encoding="$(file -bL --mime-encoding -- "$1")"
mimetype="$(file -bL --mime-type -- "$1")"
ext="${1##*.}"
[ -n "$ext" ] && ext="$(printf "%s" "${ext}" | tr '[:upper:]' '[:lower:]')"
lines=$(tput lines)
cols=$(tput cols)
# Otherwise, falling back to the defaults.
if [ -d "$1" ]; then
cd "$1" || return
if [ "$ICONLOOKUP" -ne 0 ] && [ -f "$(dirname "$0")"/.iconlookup ]; then
[ "$SPLIT" = v ] && BSTR="\n"
# shellcheck disable=SC2012
ls -F --group-directories-first | head -n "$((lines - 3))" | "$(dirname "$0")"/.iconlookup -l "$cols" -B "$BSTR" -b " "
elif exists tree; then
fifo_pager tree --filelimit "$(find . -maxdepth 1 | wc -l)" -L 3 -C -F --dirsfirst --noreport
elif exists exa; then
exa -G --group-directories-first --colour=always
else
fifo_pager ls -F --group-directories-first --color=always
fi
elif [ "${encoding#*)}" = "binary" ]; then
handle_mime "$1" "$mimetype" "$ext" "bin"
else
handle_mime "$1" "$mimetype" "$ext"
fi
}
generate_preview() {
if [ -n "$QLPATH" ] && stat "$3"; then
f="$(wslpath -w "$3")" && "$QLPATH" "$f" &
elif [ ! -f "$NNN_PREVIEWDIR/$3.jpg" ] || [ -n "$(find -L "$3" -newer "$NNN_PREVIEWDIR/$3.jpg")" ]; then
mkdir -p "$NNN_PREVIEWDIR/${3%/*}"
case $4 in
audio) ffmpeg -i "$3" -filter_complex "scale=iw*min(1\,min($NNN_PREVIEWWIDTH/iw\,ih)):-1" "$NNN_PREVIEWDIR/$3.jpg" -y ;;
epub) gnome-epub-thumbnailer "$3" "$NNN_PREVIEWDIR/$3.jpg" ;;
font) fontpreview -i "$3" -o "$NNN_PREVIEWDIR/$3.jpg" ;;
gif) if [ -p "$FIFO_UEBERZUG" ] && exists convert; then
frameprefix="$NNN_PREVIEWDIR/$3/${3##*/}"
if [ ! -d "$NNN_PREVIEWDIR/$3" ]; then
mkdir -p "$NNN_PREVIEWDIR/$3"
convert -coalesce -resize "$NNN_PREVIEWWIDTH"x"$NNN_PREVIEWHEIGHT"\> "$3" "$frameprefix.jpg" ||
MAGICK_TMPDIR="/tmp" convert -coalesce -resize "$NNN_PREVIEWWIDTH"x"$NNN_PREVIEWHEIGHT"\> "$3" "$frameprefix.jpg"
fi
frames=$(($(find "$NNN_PREVIEWDIR/$3" | wc -l) - 2))
[ $frames -lt 0 ] && return
while true; do
for i in $(seq 0 $frames); do
image_preview "$1" "$2" "$frameprefix-$i.jpg"
sleep 0.1
done
done &
printf "%s" "$!" > "$PREVIEWPID"
return
else
image_preview "$1" "$2" "$3"
return
fi ;;
image) if exists convert; then
convert "$3" -flatten -resize "$NNN_PREVIEWWIDTH"x"$NNN_PREVIEWHEIGHT"\> "$NNN_PREVIEWDIR/$3.jpg"
else
image_preview "$1" "$2" "$3" && return
fi ;;
office) libreoffice --convert-to jpg "$3" --outdir "$NNN_PREVIEWDIR/${3%/*}"
filename="$(printf "%s" "${3##*/}" | cut -d. -f1)"
mv "$NNN_PREVIEWDIR/${3%/*}/$filename.jpg" "$NNN_PREVIEWDIR/$3.jpg" ;;
pdf) pdftoppm -jpeg -f 1 -singlefile "$3" "$NNN_PREVIEWDIR/$3" ;;
djvu) ddjvu -format=ppm -page=1 "$3" "$NNN_PREVIEWDIR/$3.jpg" ;;
video) ffmpegthumbnailer -m -s0 -i "$3" -o "$NNN_PREVIEWDIR/$3.jpg" || rm "$NNN_PREVIEWDIR/$3.jpg" ;;
esac
fi
if [ -f "$NNN_PREVIEWDIR/$3.jpg" ]; then
image_preview "$1" "$2" "$NNN_PREVIEWDIR/$3.jpg"
else
fifo_pager print_bin_info "$3"
fi
} >/dev/null 2>&1
image_preview() {
clear
exec >/dev/tty
if [ "$TERMINAL" = "kitty" ]; then
# Kitty terminal users can use the native image preview method
kitty +kitten icat --silent --scale-up --place "$1"x"$2"@0x0 --transfer-mode=stream --stdin=no "$3" &
elif exists ueberzug; then
ueberzug_layer "$1" "$2" "$3" && return
elif exists catimg; then
catimg "$3" &
elif exists viu; then
viu -t "$3" &
else
fifo_pager print_bin_info "$3" && return
fi
printf "%s" "$!" > "$PREVIEWPID"
}
ueberzug_layer() {
[ -f "$POSOFFSET" ] && read -r x y < "$POSOFFSET"
printf '{"action": "add", "identifier": "nnn_ueberzug", "x": %d, "y": %d, "width": "%d", "height": "%d", "scaler": "fit_contain", "path": "%s"}\n'\
"${x:-0}" "${y:-0}" "$1" "$2" "$3" > "$FIFO_UEBERZUG"
}
ueberzug_remove() {
printf '{"action": "remove", "identifier": "nnn_ueberzug"}\n' > "$FIFO_UEBERZUG"
}
winch_handler() {
clear
pidkill "$PREVIEWPID"
if [ -p "$FIFO_UEBERZUG" ]; then
pkill -f "tail --follow $FIFO_UEBERZUG"
tail --follow "$FIFO_UEBERZUG" | ueberzug layer --silent --parser json &
fi
preview_file "$(cat "$CURSEL")"
}
preview_fifo() {
while read -r selection; do
if [ -n "$selection" ]; then
pidkill "$PREVIEWPID"
[ -p "$FIFO_UEBERZUG" ] && ueberzug_remove
[ "$selection" = "close" ] && break
preview_file "$selection"
printf "%s" "$selection" > "$CURSEL"
fi
done < "$NNN_FIFO"
sleep 0.1 # make sure potential preview by winch_handler is killed
pkill -P "$$"
}
if [ "$PREVIEW_MODE" ]; then
if [ "$TERMINAL" != "kitty" ] && exists ueberzug; then
mkfifo "$FIFO_UEBERZUG"
tail --follow "$FIFO_UEBERZUG" | ueberzug layer --silent --parser json &
fi
preview_file "$PWD/$1"
preview_fifo &
printf "%s" "$!" > "$FIFOPID"
printf "%s" "$PWD/$1" > "$CURSEL"
trap 'winch_handler; wait' WINCH
trap 'rm "$PREVIEWPID" "$CURSEL" "$FIFO_UEBERZUG" "$FIFOPID" "$POSOFFSET" 2>/dev/null' INT HUP EXIT
wait "$!" 2>/dev/null
exit 0
else
if [ ! -r "$NNN_FIFO" ]; then
clear
prompt "No FIFO available! (\$NNN_FIFO='$NNN_FIFO')\nPlease read Usage in preview-tui."
elif [ "$KITTY_WINDOW_ID" ] && [ -z "$TMUX" ] && [ -z "$KITTY_LISTEN_ON" ]; then
clear
prompt "\$KITTY_LISTEN_ON not set!\nPlease read Usage in preview-tui."
else
toggle_preview "$1" &
fi
fi
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