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Member "nnn-4.4/plugins/preview-tui" (23 Nov 2021, 18349 Bytes) of package /linux/misc/nnn-v4.4.tar.gz:


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    1 #!/usr/bin/env sh
    2 
    3 # Description: Terminal based file previewer
    4 #
    5 # Note: This plugin needs a "NNN_FIFO" to work. See man.
    6 #
    7 # Dependencies:
    8 #   - Supports 4 independent methods to preview with:
    9 #       - tmux (>=3.0), or
   10 #       - kitty with allow_remote_control and listen_on set in kitty.conf, or
   11 #       - QuickLook on WSL (https://github.com/QL-Win/QuickLook)
   12 #       - $TERMINAL set to a terminal (it's xterm by default).
   13 #   - less or $PAGER
   14 #   - tree or exa or ls
   15 #   - mediainfo or file
   16 #   - mktemp
   17 #   - unzip
   18 #   - tar
   19 #   - man
   20 #   - optional: bsdtar or atool for additional archive preview
   21 #   - optional: bat for code syntax highlighting
   22 #   - optional: ueberzug, kitty terminal, viu or catimg for images
   23 #   - optional: convert(ImageMagick) for playing gif preview
   24 #   - optional: ffmpegthumbnailer for video thumbnails (https://github.com/dirkvdb/ffmpegthumbnailer)
   25 #   - optional: ffmpeg for audio thumbnails
   26 #   - optional: libreoffce for opendocument/officedocument preview
   27 #   - optional: pdftoppm(poppler) for pdf thumbnails
   28 #   - optional: gnome-epub-thumbnailer for epub thumbnails (https://gitlab.gnome.org/GNOME/gnome-epub-thumbnailer)
   29 #   - optional: fontpreview for font preview (https://github.com/sdushantha/fontpreview)
   30 #   - optional: glow or lowdown for markdown
   31 #   - optional: w3m or lynx or elinks for html
   32 #   - optional: set/export ICONLOOKUP as 1 to enable file icons in front of directory previews with .iconlookup
   33 #       Icons and colors are configureable in .iconlookup
   34 #   - optional: scope.sh file viewer from ranger.
   35 #       1. drop scope.sh executable in $PATH
   36 #       2. set/export $USE_SCOPE as 1
   37 #   - optional: pistol file viewer (https://github.com/doronbehar/pistol).
   38 #       1. install pistol
   39 #       2. set/export $USE_PISTOL as 1
   40 #
   41 # Usage:
   42 #   You need to set a NNN_FIFO path and a key for the plugin with NNN_PLUG,
   43 #   then start `nnn`:
   44 #
   45 #     $ nnn -a
   46 #
   47 #   or
   48 #
   49 #     $ NNN_FIFO=/tmp/nnn.fifo nnn
   50 #
   51 #   Then launch the `preview-tui` plugin in `nnn`.
   52 #
   53 #   If you provide the same NNN_FIFO to all nnn instances, there will be a
   54 #   single common preview window. If you provide different FIFO path (e.g.
   55 #   with -a), they will be independent.
   56 #
   57 #   The previews will be shown in a tmux split. If that isn't possible, it
   58 #   will try to use a kitty terminal split. And as a final fallback, a
   59 #   different terminal window will be used ($TERMINAL).
   60 #
   61 #   Tmux and kitty users can configure $SPLIT to either "h" or "v" to set a
   62 #   'h'orizontal split or a 'v'ertical split (as in, the line that splits the
   63 #   windows will be horizontal or vertical).
   64 #
   65 #   Kitty users need `allow_remote_control` set to `yes`, and `listen_on` set
   66 #   to e.g. "unix:$TMPDIR/kitty". To customize the window split, `enabled_layouts`
   67 #   has to be set to `all` or `splits` (the former is the default value).
   68 #   This terminal is also able to show images without extra dependencies.
   69 #
   70 #   Iterm2 users are recommended to use viu to view images without getting pixelated.
   71 #
   72 # Shell: POSIX compliant
   73 # Authors: Todd Yamakawa, Léo Villeveygoux, @Recidiviste, Mario Ortiz Manero, Luuk van Baal
   74 
   75 #SPLIT="$SPLIT"  # you can set a permanent split here
   76 #TERMINAL="$TERMINAL"  # same goes for the terminal
   77 USE_SCOPE="${USE_SCOPE:-0}"
   78 USE_PISTOL="${USE_PISTOL:-0}"
   79 ICONLOOKUP="${ICONLOOKUP:-0}"
   80 PAGER="${PAGER:-less -P?n -R}"
   81 TMPDIR="${TMPDIR:-/tmp}"
   82 BAT_STYLE="${BAT_STYLE:-numbers}"
   83 BAT_THEME="${BAT_THEME:-ansi}"
   84 # Consider setting NNN_PREVIEWDIR to $XDG_CACHE_HOME/nnn/previews if you want to keep previews on disk between reboots
   85 NNN_PREVIEWDIR="${NNN_PREVIEWDIR:-$TMPDIR/nnn/previews}"
   86 NNN_PREVIEWWIDTH="${NNN_PREVIEWWIDTH:-1920}"
   87 NNN_PREVIEWHEIGHT="${NNN_PREVIEWHEIGHT:-1080}"
   88 NNN_PARENT="${NNN_FIFO#*.}"
   89 [ "$NNN_PARENT" -eq "$NNN_PARENT" ] 2>/dev/null || NNN_PARENT=""
   90 FIFOPID="$TMPDIR/nnn-preview-tui-fifopid.$NNN_PARENT"
   91 PREVIEWPID="$TMPDIR/nnn-preview-tui-pagerpid.$NNN_PARENT"
   92 CURSEL="$TMPDIR/nnn-preview-tui-selection.$NNN_PARENT"
   93 FIFO_UEBERZUG="$TMPDIR/nnn-preview-tui-ueberzug-fifo.$NNN_PARENT"
   94 
   95 start_preview() {
   96     [ "$PAGER" = "most" ] && PAGER="less -R"
   97 
   98     if [ -e "${TMUX%%,*}" ] && tmux -V | grep -q '[ -][3456789]\.'; then
   99         TERMINAL=tmux
  100     elif [ -n "$KITTY_LISTEN_ON" ]; then
  101         TERMINAL=kitty
  102     elif [ -z "$TERMINAL" ] && [ "$TERM_PROGRAM" = "iTerm.app" ]; then
  103         TERMINAL=iterm
  104     else
  105         TERMINAL="${TERMINAL:-xterm}"
  106     fi
  107 
  108     if [ -z "$SPLIT" ] && [ $(($(tput lines <"$TTY") * 2)) -gt "$(tput cols <"$TTY")" ]; then
  109         SPLIT='h'
  110     elif [ "$SPLIT" != 'h' ]; then
  111         SPLIT='v'
  112     fi
  113 
  114     case "$TERMINAL" in
  115         tmux) # tmux splits are inverted
  116             if [ "$SPLIT" = "v" ]; then DSPLIT="h"; else DSPLIT="v"; fi
  117             tmux split-window -e "NNN_FIFO=$NNN_FIFO" -e "PREVIEW_MODE=1" -e TTY="$TTY" \
  118                 -e "CURSEL=$CURSEL" -e "TMPDIR=$TMPDIR" -e "FIFOPID=$FIFOPID" \
  119                 -e "BAT_STYLE=$BAT_STYLE" -e "BAT_THEME=$BAT_THEME" -e "PREVIEWPID=$PREVIEWPID" \
  120                 -e "PAGER=$PAGER" -e "ICONLOOKUP=$ICONLOOKUP" -e "NNN_PREVIEWWIDTH=$NNN_PREVIEWWIDTH" \
  121                 -e "USE_SCOPE=$USE_SCOPE" -e "SPLIT=$SPLIT" -e "USE_PISTOL=$USE_PISTOL" \
  122                 -e "NNN_PREVIEWDIR=$NNN_PREVIEWDIR" -e "NNN_PREVIEWHEIGHT=$NNN_PREVIEWHEIGHT" \
  123                 -e "FIFO_UEBERZUG=$FIFO_UEBERZUG" -e "QLPATH=$2" -d"$DSPLIT" "$0" "$1" ;;
  124         kitty) # Setting the layout for the new window. It will be restored after the script ends.
  125             kitty @ goto-layout splits
  126             # Trying to use kitty's integrated window management as the split window. All
  127             # environmental variables that will be used in the new window must be explicitly passed.
  128             kitty @ launch --no-response --title "nnn preview" --keep-focus \
  129                 --cwd "$PWD" --env "PATH=$PATH" --env "NNN_FIFO=$NNN_FIFO" \
  130                 --env "PREVIEW_MODE=1" --env "PAGER=$PAGER" --env "TMPDIR=$TMPDIR" \
  131                 --env "USE_SCOPE=$USE_SCOPE" --env "SPLIT=$SPLIT" --env "TERMINAL=$TERMINAL"\
  132                 --env "PREVIEWPID=$PREVIEWPID" --env "FIFO_UEBERZUG=$FIFO_UEBERZUG" \
  133                 --env "ICONLOOKUP=$ICONLOOKUP" --env "NNN_PREVIEWHEIGHT=$NNN_PREVIEWHEIGHT" \
  134                 --env "NNN_PREVIEWWIDTH=$NNN_PREVIEWWIDTH" --env "NNN_PREVIEWDIR=$NNN_PREVIEWDIR" \
  135                 --env "USE_PISTOL=$USE_PISTOL" --env "BAT_STYLE=$BAT_STYLE" \
  136                 --env "BAT_THEME=$BAT_THEME" --env "FIFOPID=$FIFOPID" --env TTY="$TTY" \
  137                 --env "CURSEL=$CURSEL" --location "${SPLIT}split" "$0" "$1" ;;
  138         iterm)
  139             command="$SHELL -c 'cd $PWD; \
  140                 PATH=\\\"$PATH\\\" NNN_FIFO=\\\"$NNN_FIFO\\\" PREVIEW_MODE=1 PAGER=\\\"$PAGER\\\" \
  141                 USE_SCOPE=\\\"$USE_SCOPE\\\" SPLIT=\\\"$SPLIT\\\" TERMINAL=\\\"$TERMINAL\\\" \
  142                 PREVIEWPID=\\\"$PREVIEWPID\\\" CURSEL=\\\"$CURSEL\\\" TMPDIR=\\\"$TMPDIR\\\" \
  143                 ICONLOOKUP=\\\"$ICONLOOKUP\\\" NNN_PREVIEWHEIGHT=\\\"$NNN_PREVIEWHEIGHT\\\" \
  144                 NNN_PREVIEWWIDTH=\\\"$NNN_PREVIEWWIDTH\\\" NNN_PREVIEWDIR=\\\"$NNN_PREVIEWDIR\\\" \
  145                 USE_PISTOL=\\\"$USE_PISTOL\\\" BAT_STYLE=\\\"$BAT_STYLE\\\" TTY=\\\"$TTY\\\" \
  146                 BAT_THEME=\\\"$BAT_THEME\\\" FIFOPID=\\\"$FIFOPID\\\" \\\"$0\\\" \\\"$1\\\"'"
  147             if [ "$SPLIT" = "h" ]; then split="horizontally"; else split="vertically"; fi
  148             osascript <<-EOF
  149             tell application "iTerm"
  150                 tell current session of current window
  151                     split $split with default profile command "$command"
  152                 end tell
  153             end tell
  154 EOF
  155             ;;
  156         *)  if [ -n "$2" ]; then
  157                 QUICKLOOK=1 QLPATH="$2" PREVIEW_MODE=1 "$0" "$1" &
  158             else
  159                 PREVIEWPID="$PREVIEWPID" CURSEL="$CURSEL" PREVIEW_MODE=1 TTY="$TTY" \
  160                      FIFOPID="$FIFOPID" FIFO_UEBERZUG="$FIFO_UEBERZUG" $TERMINAL -e "$0" "$1" &
  161             fi ;;
  162     esac
  163 } >/dev/null 2>&1
  164 
  165 toggle_preview() {
  166     if exists QuickLook.exe; then
  167         QLPATH="QuickLook.exe"
  168     elif exists Bridge.exe; then
  169         QLPATH="Bridge.exe"
  170     fi
  171     if kill "$(cat "$FIFOPID")"; then
  172         [ -p "$NNN_PPIPE" ] && printf "0" > "$NNN_PPIPE"
  173         kill "$(cat "$PREVIEWPID")"
  174         pkill -f "tail --follow $FIFO_UEBERZUG"
  175         if [ -n "$QLPATH" ] && stat "$1"; then
  176             f="$(wslpath -w "$1")" && "$QLPATH" "$f" &
  177         fi
  178     else
  179         [ -p "$NNN_PPIPE" ] && printf "1" > "$NNN_PPIPE"
  180         start_preview "$1" "$QLPATH"
  181     fi
  182 } >/dev/null 2>&1
  183 
  184 exists() {
  185     type "$1" >/dev/null
  186 }
  187 
  188 fifo_pager() {
  189     cmd="$1"
  190     shift
  191 
  192     # We use a FIFO to access $PAGER PID in jobs control
  193     tmpfifopath="$TMPDIR/nnn-preview-tui-fifo.$$"
  194     mkfifo "$tmpfifopath" || return
  195 
  196     $PAGER < "$tmpfifopath" &
  197     printf "%s" "$!" > "$PREVIEWPID"
  198 
  199     (
  200         exec > "$tmpfifopath"
  201         if [ "$cmd" = "pager" ]; then
  202             if exists bat; then
  203                 bat --terminal-width="$(tput cols <"$TTY")" --decorations=always --color=always \
  204                     --paging=never --style="$BAT_STYLE" --theme="$BAT_THEME" "$@" &
  205             else
  206                 $PAGER "$@" &
  207             fi
  208         else
  209             "$cmd" "$@" &
  210         fi
  211     )
  212 
  213     rm "$tmpfifopath"
  214 } 2>/dev/null
  215 
  216 # Binary file: show file info inside the pager
  217 print_bin_info() {
  218     printf -- "-------- \033[1;31mBinary file\033[0m --------\n"
  219     if exists mediainfo; then
  220         mediainfo "$1"
  221     else
  222         file -b "$1"
  223     fi
  224 } 2>/dev/null
  225 
  226 handle_mime() {
  227     case "$2" in
  228         image/jpeg) image_preview "$cols" "$lines" "$1" ;;
  229         image/gif) generate_preview "$cols" "$lines" "$1" "gif" ;;
  230         image/*) generate_preview "$cols" "$lines" "$1" "image" ;;
  231         video/*) generate_preview "$cols" "$lines" "$1" "video" ;;
  232         audio/*) generate_preview "$cols" "$lines" "$1" "audio" ;;
  233         application/font*|application/*opentype|font/*) generate_preview "$cols" "$lines" "$1" "font" ;;
  234         */*office*|*/*document*) generate_preview "$cols" "$lines" "$1" "office" ;;
  235         application/zip) fifo_pager unzip -l "$1" ;;
  236         text/troff)
  237             if exists man; then
  238                 fifo_pager man -Pcat -l "$1"
  239             else
  240                 fifo_pager pager "$1"
  241             fi ;;
  242         *) handle_ext "$1" "$3" "$4" ;;
  243     esac
  244 }
  245 
  246 handle_ext() {
  247     case "$2" in
  248         epub) generate_preview "$cols" "$lines" "$1" "epub" ;;
  249         pdf) generate_preview "$cols" "$lines" "$1" "pdf" ;;
  250         gz|bz2) fifo_pager tar -tvf "$1" ;;
  251         md) if exists glow; then
  252                 fifo_pager glow -s dark "$1"
  253             elif exists lowdown; then
  254                 fifo_pager lowdown -Tterm "$1"
  255             else
  256                 fifo_pager pager "$1"
  257             fi ;;
  258         htm|html|xhtml)
  259             if exists w3m; then
  260                 fifo_pager w3m "$1"
  261             elif exists lynx; then
  262                 fifo_pager lynx "$1"
  263             elif exists elinks; then
  264                 fifo_pager elinks "$1"
  265             else
  266                 fifo_pager pager "$1"
  267             fi ;;
  268         7z|a|ace|alz|arc|arj|bz|cab|cpio|deb|jar|lha|lz|lzh|lzma|lzo\
  269         |rar|rpm|rz|t7z|tar|tbz|tbz2|tgz|tlz|txz|tZ|tzo|war|xpi|xz|Z)
  270             if exists atool; then
  271                 fifo_pager atool -l "$1"
  272             elif exists bsdtar; then
  273                 fifo_pager bsdtar -tvf "$1"
  274             fi ;;
  275         *) if [ "$3" = "bin" ]; then
  276                fifo_pager print_bin_info "$1"
  277            else
  278                fifo_pager pager "$1"
  279            fi ;;
  280     esac
  281 }
  282 
  283 preview_file() {
  284     clear
  285     # Trying to use pistol if it's available.
  286     if [ "$USE_PISTOL" -ne 0 ] && exists pistol; then
  287         fifo_pager pistol "$1"
  288         return
  289     fi
  290 
  291     # Trying to use scope.sh if it's available.
  292     if [ "$USE_SCOPE" -ne 0 ] && exists scope.sh; then
  293         fifo_pager scope.sh "$1" "$cols" "$lines" "$(mktemp -d)" "True"
  294         return
  295     fi
  296 
  297     # Use QuickLook if it's available.
  298     if [ -n "$QUICKLOOK" ]; then
  299         stat "$1" && f="$(wslpath -w "$1")" && "$QLPATH" "$f" &
  300         return
  301     fi
  302 
  303     # Detecting the exact type of the file: the encoding, mime type, and extension in lowercase.
  304     encoding="$(file -bL --mime-encoding -- "$1")"
  305     mimetype="$(file -bL --mime-type -- "$1")"
  306     ext="${1##*.}"
  307     [ -n "$ext" ] && ext="$(printf "%s" "${ext}" | tr '[:upper:]' '[:lower:]')"
  308     lines=$(tput lines <"$TTY")
  309     cols=$(tput cols <"$TTY")
  310 
  311     # Otherwise, falling back to the defaults.
  312     if [ -d "$1" ]; then
  313         cd "$1" || return
  314         if [ "$ICONLOOKUP" -ne 0 ] && [ -f "$(dirname "$0")"/.iconlookup ]; then
  315             [ "$SPLIT" = v ] && BSTR="\n"
  316             # shellcheck disable=SC2012
  317             ls -F --group-directories-first | head -n "$((lines - 3))" | "$(dirname "$0")"/.iconlookup -l "$cols" -B "$BSTR" -b " "
  318         elif exists tree; then
  319             fifo_pager tree --filelimit "$(find . -maxdepth 1 | wc -l)" -L 3 -C -F --dirsfirst --noreport
  320         elif exists exa; then
  321             exa -G --group-directories-first --colour=always
  322         else
  323             fifo_pager ls -F --group-directories-first --color=always
  324         fi
  325     elif [ "${encoding#*)}" = "binary" ]; then
  326         handle_mime "$1" "$mimetype" "$ext" "bin"
  327     else
  328         handle_mime "$1" "$mimetype" "$ext"
  329     fi
  330 } 2>/dev/null
  331 
  332 generate_preview() {
  333   if [ -n "$QLPATH" ] && stat "$3"; then
  334         f="$(wslpath -w "$3")" && "$QLPATH" "$f" &
  335   elif [ ! -f "$NNN_PREVIEWDIR/$3.jpg" ] || [ -n "$(find -L "$3" -newer "$NNN_PREVIEWDIR/$3.jpg")" ]; then
  336         mkdir -p "$NNN_PREVIEWDIR/${3%/*}"
  337         case $4 in
  338             audio) ffmpeg -i "$3" -filter_complex "scale=iw*min(1\,min($NNN_PREVIEWWIDTH/iw\,ih)):-1" "$NNN_PREVIEWDIR/$3.jpg" -y ;;
  339             epub) gnome-epub-thumbnailer "$3" "$NNN_PREVIEWDIR/$3.jpg" ;;
  340             font) fontpreview -i "$3" -o "$NNN_PREVIEWDIR/$3.jpg" ;;
  341             gif) if [ -p "$FIFO_UEBERZUG" ] && exists convert; then
  342                     if [ ! -d "$NNN_PREVIEWDIR/$3" ]; then
  343                         mkdir -p "$NNN_PREVIEWDIR/$3"
  344                         convert -coalesce -resize "$NNN_PREVIEWWIDTH"x"$NNN_PREVIEWHEIGHT"\> "$3" "$NNN_PREVIEWDIR/$3/${3##*/}.jpg"
  345                     fi
  346                         while true; do
  347                             for frame in $(find "$NNN_PREVIEWDIR/$3"/*.jpg | sort -V); do
  348                                 image_preview "$1" "$2" "$frame"
  349                                 sleep 0.1
  350                             done
  351                         done &
  352                         printf "%s" "$!" > "$PREVIEWPID"
  353                         return
  354                  else
  355                     exec >/dev/tty
  356                     image_preview "$1" "$2" "$3"
  357                     return
  358                  fi ;;
  359             image) if exists convert; then
  360                        convert "$3" -flatten -resize "$NNN_PREVIEWWIDTH"x"$NNN_PREVIEWHEIGHT"\> "$NNN_PREVIEWDIR/$3.jpg"
  361                    else
  362                        image_preview "$1" "$2" "$3" && return
  363                    fi ;;
  364             office) libreoffice --convert-to jpg "$3" --outdir "$NNN_PREVIEWDIR/${3%/*}"
  365                     filename="$(printf "%s" "${3##*/}" | cut -d. -f1)"
  366                     mv "$NNN_PREVIEWDIR/${3%/*}/$filename.jpg" "$NNN_PREVIEWDIR/$3.jpg" ;;
  367             pdf) pdftoppm -jpeg -f 1 -singlefile "$3" "$NNN_PREVIEWDIR/$3" ;;
  368             video) ffmpegthumbnailer -s0 -i "$3" -o "$NNN_PREVIEWDIR/$3.jpg" || rm "$NNN_PREVIEWDIR/$3.jpg" ;;
  369         esac
  370     fi >/dev/null
  371     if [ -f "$NNN_PREVIEWDIR/$3.jpg" ]; then
  372         image_preview "$1" "$2" "$NNN_PREVIEWDIR/$3.jpg"
  373     else
  374         fifo_pager print_bin_info "$3"
  375     fi
  376 } 2>/dev/null
  377 
  378 image_preview() {
  379     clear
  380     if [ "$TERMINAL" = "kitty" ]; then
  381         # Kitty terminal users can use the native image preview method
  382         kitty +kitten icat --silent --place "$1"x"$2"@0x0 --transfer-mode=stream --stdin=no "$3" &
  383     elif exists ueberzug; then
  384         ueberzug_layer "$1" "$2" "$3" && return
  385     elif exists catimg; then
  386         catimg "$3" &
  387     elif exists viu; then
  388         viu -t "$3" &
  389     else
  390         fifo_pager print_bin_info "$3" && return
  391     fi
  392     printf "%s" "$!" > "$PREVIEWPID"
  393 } 2>/dev/null
  394 
  395 ueberzug_layer() {
  396     printf '{"action": "add", "identifier": "nnn_ueberzug", "x": 0, "y": 0, "width": "%d", "height": "%d", "scaler": "fit_contain", "path": "%s"}\n' "$1" "$2" "$3" > "$FIFO_UEBERZUG"
  397 }
  398 
  399 ueberzug_remove() {
  400     printf '{"action": "remove", "identifier": "nnn_ueberzug"}\n' > "$FIFO_UEBERZUG"
  401 }
  402 
  403 winch_handler() {
  404     clear
  405     kill "$(cat "$PREVIEWPID")"
  406     if [ -p "$FIFO_UEBERZUG" ]; then
  407         pkill -f "tail --follow $FIFO_UEBERZUG"
  408         tail --follow "$FIFO_UEBERZUG" | ueberzug layer --silent --parser json &
  409     fi
  410     preview_file "$(cat "$CURSEL")"
  411 } 2>/dev/null
  412 
  413 preview_fifo() {
  414     while read -r selection; do
  415         if [ -n "$selection" ]; then
  416             kill "$(cat "$PREVIEWPID")"
  417             [ -p "$FIFO_UEBERZUG" ] && ueberzug_remove
  418             [ "$selection" = "close" ] && sleep 0.15 && pkill -P "$$" && exit
  419             preview_file "$selection"
  420             printf "%s" "$selection" > "$CURSEL"
  421         fi
  422     done < "$NNN_FIFO"
  423     sleep 0.1 # make sure potential preview by winch_handler is killed
  424     pkill -P "$$"
  425 } 2>/dev/null
  426 
  427 if [ "$PREVIEW_MODE" ]; then
  428     if [ "$TERMINAL" != "kitty" ] && exists ueberzug; then
  429         mkfifo "$FIFO_UEBERZUG"
  430         tail --follow "$FIFO_UEBERZUG" | ueberzug layer --silent --parser json &
  431     fi
  432 
  433     preview_file "$PWD/$1"
  434     preview_fifo &
  435     printf "%s" "$!" > "$FIFOPID"
  436     printf "%s" "$PWD/$1" > "$CURSEL"
  437     trap 'winch_handler; wait' WINCH
  438     trap 'rm "$PREVIEWPID" "$CURSEL" "$FIFO_UEBERZUG" "$FIFOPID" 2>/dev/null' INT HUP EXIT
  439     wait "$!" 2>/dev/null
  440 else
  441     if [ ! -r "$NNN_FIFO" ]; then
  442         clear
  443         printf "No FIFO available! (\$NNN_FIFO='%s')\nPlease read Usage in preview-tui." "$NNN_FIFO"
  444         cfg=$(stty -g); stty raw -echo; head -c 1; stty "$cfg"
  445     elif [ "$KITTY_WINDOW_ID" ] && [ -z "$TMUX" ] && [ -z "$KITTY_LISTEN_ON" ]; then
  446         clear
  447         printf "\$KITTY_LISTEN_ON not set!\nPlease read Usage in preview-tui."
  448         cfg=$(stty -g); stty raw -echo; head -c 1; stty "$cfg"
  449     else
  450         TTY="$(tty)"
  451         TTY="$TTY" toggle_preview "$1" &
  452     fi
  453 fi