492 lines
19 KiB
Bash
Executable file
492 lines
19 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Description: Terminal based file previewer
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#
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# Note: This plugin needs a "NNN_FIFO" to work. See man.
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#
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# Dependencies:
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# - Supports 6 independent methods to preview with:
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# - tmux (>=3.0), or
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# - kitty with allow_remote_control and listen_on set in kitty.conf, or
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# - wezterm (https://wezfurlong.org/wezterm), or
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# - QuickLook on WSL (https://github.com/QL-Win/QuickLook), or
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# - Windows Terminal (https://github.com/Microsoft/Terminal | https://aka.ms/terminal) with WSL, or
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# - $NNN_TERMINAL set to a terminal (it's xterm by default).
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# - less or $NNN_PAGER
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# - tree or exa or (GNU) ls
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# - mediainfo or file
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# - mktemp
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# - unzip
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# - tar
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# - man
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# - optional: bsdtar or atool for additional archive preview
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# - optional: bat for code syntax highlighting
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# - optional: ueberzug, kitty terminal, wezterm terminal, viu, catimg or chafa for images
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# - optional: convert(ImageMagick) for playing gif preview (required for kitty image previews)
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# - optional: ffmpegthumbnailer for video thumbnails (https://github.com/dirkvdb/ffmpegthumbnailer)
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# - optional: ffmpeg for audio thumbnails
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# - optional: libreoffce for opendocument/officedocument preview
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# - optional: pdftoppm(poppler) for pdf thumbnails
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# - optional: gnome-epub-thumbnailer for epub thumbnails (https://gitlab.gnome.org/GNOME/gnome-epub-thumbnailer)
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# - optional: fontpreview for font preview (https://github.com/sdushantha/fontpreview)
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# - optional: djvulibre for djvu
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# - optional: glow or lowdown for markdown
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# - optional: w3m or lynx or elinks for html
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# - optional: set/export NNN_ICONLOOKUP as 1 to enable file icons in front of directory previews with .iconlookup
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# Icons and colors are configurable in .iconlookup
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# - optional: scope.sh file viewer from ranger.
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# 1. drop scope.sh executable in $PATH
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# 2. set/export $NNN_SCOPE as 1
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# - optional: pistol file viewer (https://github.com/doronbehar/pistol).
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# 1. install pistol
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# 2. set/export $NNN_PISTOL as 1
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#
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# Usage:
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# You need to set a NNN_FIFO path and a key for the plugin with NNN_PLUG,
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# then start `nnn`:
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#
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# $ nnn -a
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#
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# or
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#
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# $ NNN_FIFO=/tmp/nnn.fifo nnn
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#
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# Then launch the `preview-tui` plugin in `nnn`.
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#
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# If you provide the same NNN_FIFO to all nnn instances, there will be a
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# single common preview window. If you provide different FIFO path (e.g.
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# with -a), they will be independent.
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#
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# The previews will be shown in a tmux split. If that isn't possible, it
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# will try to use a kitty terminal split. And as a final fallback, a
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# different terminal window will be used ($NNN_TERMINAL).
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#
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# Kitty users need something similar to the following in their kitty.conf:
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# - `allow_remote_control yes`
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# - `listen_on unix:$TMPDIR/kitty`
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# - `enabled_layouts splits` (optional)
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# With ImageMagick installed, this terminal can use the icat kitten to display images.
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# Refer to kitty documentation for further details.
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#
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# Wezterm should work out of the box. If `NNN_PREVIEWIMGPROG` is not specified it will use
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# built in iTerm2 image protocol.
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#
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# Note that GNU ls is used for its `--group-directories-first` flag.
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# On MacOS this may be installed with `brew install coreutils`, or the flag can be removed.
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# iTerm2 users are recommended to use viu to view images without getting pixelated.
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#
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# Windows Terminal users can set "Profile termination behavior" under "Profile > Advanced" settings
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# to automatically close pane on quit when exit code is 0.
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#
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# When specifying a different terminal, additional arguments are supported. In particular, you can
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# append a specific title to the terminal and set it to "nofocus" in your WM config.
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# E.g for alacritty and i3, you can set $NNN_TERMINAL to 'alacritty --title preview-tui' and add
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# 'no_focus [title="preview-tui"]' to your i3 config file.
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#
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# Shell: Bash (for environment manipulation through arrays)
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# Authors: Todd Yamakawa, Léo Villeveygoux, @Recidiviste, Mario Ortiz Manero, Luuk van Baal, @WanderLanz
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NNN_SPLIT=${NNN_SPLIT:-} # Set permanent split direction
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NNN_TERMINAL=${NNN_TERMINAL:-} # Set external terminal to be used
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NNN_SPLITSIZE=${NNN_SPLITSIZE:-50} # Set previewer split size percentage
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TMPDIR=${TMPDIR:-/tmp}
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NNN_PARENT=${NNN_FIFO#*.}
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[ "$NNN_PARENT" -eq "$NNN_PARENT" ] 2>/dev/null || NNN_PARENT="" # Make empty if non-numeric
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ENVVARS=(
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"PWD=$PWD"
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"PATH=$PATH"
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"NNN_FIFO=$NNN_FIFO"
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"NNN_SCOPE=${NNN_SCOPE:-0}"
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"NNN_PISTOL=${NNN_PISTOL:-0}"
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"NNN_ICONLOOKUP=${NNN_ICONLOOKUP:-0}"
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"NNN_PAGER=${NNN_PAGER:-less -P?n -R}"
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"NNN_BATTHEME=${NNN_BATTHEME:-ansi}"
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"NNN_BATSTYLE=${NNN_BATSTYLE:-numbers}"
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"NNN_PREVIEWWIDTH=${NNN_PREVIEWWIDTH:-1920}"
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"NNN_PREVIEWHEIGHT=${NNN_PREVIEWHEIGHT:-1080}"
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"NNN_PREVIEWDIR=${NNN_PREVIEWDIR:-$TMPDIR/nnn/previews}"
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"NNN_PREVIEWIMGPROG=${NNN_PREVIEWIMGPROG:-}"
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"FIFOPID=$TMPDIR/nnn-preview-tui-fifopid.$NNN_PARENT"
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"FIFOPATH=$TMPDIR/nnn-preview-tui-fifo.$NNN_PARENT"
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"PREVIEWPID=$TMPDIR/nnn-preview-tui-previewpid.$NNN_PARENT"
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"CURSEL=$TMPDIR/nnn-preview-tui-selection.$NNN_PARENT"
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"FIFO_UEBERZUG=$TMPDIR/nnn-preview-tui-ueberzug-fifo.$NNN_PARENT"
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"POSOFFSET=$TMPDIR/nnn-preview-tui-posoffset"
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)
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trap '' PIPE
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exists() { type "$1" >/dev/null 2>&1 ;}
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pkill() { command pkill "$@" >/dev/null 2>&1 ;}
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prompt() { clear; printf "%b" "$@"; cfg=$(stty -g); stty raw -echo; head -c 1; stty "$cfg" ;}
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pidkill() {
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if [ -f "$1" ]; then
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PID="$(cat "$1" 2>/dev/null)" || return 1
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kill "$PID" >/dev/null 2>&1
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RET=$?
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wait "$PID" 2>/dev/null
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return $RET
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fi
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return 1
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}
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start_preview() {
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if [ -e "${TMUX%%,*}" ] && tmux -V | grep -q '[ -][3456789]\.'; then
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NNN_TERMINAL=tmux
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elif [ -n "$KITTY_LISTEN_ON" ]; then
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NNN_TERMINAL=kitty
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elif [ -n "$WEZTERM_PANE" ]; then
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NNN_TERMINAL=wezterm
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elif [ -z "$NNN_TERMINAL" ] && [ "$TERM_PROGRAM" = "iTerm.app" ]; then
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NNN_TERMINAL=iterm
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elif [ -n "$WT_SESSION" ]; then
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NNN_TERMINAL=winterm
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else
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NNN_TERMINAL="${NNN_TERMINAL:-xterm}"
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fi
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if [ -z "$NNN_SPLIT" ] && [ $(($(tput lines) * 2)) -gt "$(tput cols)" ]; then
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NNN_SPLIT='h'
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elif [ "$NNN_SPLIT" != 'h' ]; then
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NNN_SPLIT='v'
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fi
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ENVVARS+=("NNN_TERMINAL=$NNN_TERMINAL" "NNN_SPLIT=$NNN_SPLIT" "QLPATH=$2" "PREVIEW_MODE=1")
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case "$NNN_TERMINAL" in
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iterm|winterm) # need run in separate shell command: escape
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ENVVARS=("${ENVVARS[@]/#/\\\"}")
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ENVVARS=("${ENVVARS[@]/%/\\\"}")
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command="$SHELL -c 'env ${ENVVARS[*]} \\\"$0\\\" \\\"$1\\\"'" ;;
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esac
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case "$NNN_TERMINAL" in
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tmux) # tmux splits are inverted
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ENVVARS=("${ENVVARS[@]/#/-e}")
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if [ "$NNN_SPLIT" = "v" ]; then split="h"; else split="v"; fi
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tmux split-window "${ENVVARS[@]}" -d"$split" -p"$NNN_SPLITSIZE" "$0" "$1" ;;
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kitty) # Setting the layout for the new window. It will be restored after the script ends.
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ENVVARS=("${ENVVARS[@]/#/--env=}")
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kitty @ goto-layout splits
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# Trying to use kitty's integrated window management as the split window.
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kitty @ launch --no-response --title "preview-tui" --keep-focus \
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--cwd "$PWD" "${ENVVARS[@]}" --location "${NNN_SPLIT}split" "$0" "$1" ;;
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wezterm)
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export "${ENVVARS[@]}"
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if [ "$NNN_SPLIT" = "v" ]; then split="--horizontal"; else split="--bottom"; fi
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wezterm cli split-pane --cwd "$PWD" $split --percent "$NNN_SPLITSIZE" "$0" "$1" >/dev/null
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wezterm cli activate-pane-direction Prev ;;
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iterm)
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if [ "$NNN_SPLIT" = "h" ]; then split="horizontally"; else split="vertically"; fi
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osascript <<-EOF
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tell application "iTerm"
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tell current session of current window
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split $split with default profile command "$command"
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end tell
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end tell
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EOF
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;;
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winterm)
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if [ "$NNN_SPLIT" = "h" ]; then split="H"; else split="V"; fi
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wt -w 0 sp -$split -s"0.$NNN_SPLITSIZE" "$command" \; -w 0 mf previous 2>/dev/null ;;
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*) if [ -n "$2" ]; then
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env "${ENVVARS[@]}" QUICKLOOK=1 "$0" "$1" &
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else
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# shellcheck disable=SC2086 # (allow arguments)
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env "${ENVVARS[@]}" $NNN_TERMINAL -e "$0" "$1" &
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fi ;;
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esac
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}
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toggle_preview() {
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export "${ENVVARS[@]}"
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if exists QuickLook.exe; then
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QLPATH="QuickLook.exe"
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elif exists Bridge.exe; then
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QLPATH="Bridge.exe"
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fi
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if pidkill "$FIFOPID"; then
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[ -p "$NNN_PPIPE" ] && printf "0" > "$NNN_PPIPE"
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pidkill "$PREVIEWPID"
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pkill -f "tail --follow $FIFO_UEBERZUG"
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if [ -n "$QLPATH" ] && stat "$1"; then
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f="$(wslpath -w "$1")" && "$QLPATH" "$f" &
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fi
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else
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[ -p "$NNN_PPIPE" ] && printf "1" > "$NNN_PPIPE"
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start_preview "$1" "$QLPATH"
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fi
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}
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fifo_pager() {
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cmd="$1"
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shift
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# We use a FIFO to access $NNN_PAGER PID in jobs control
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mkfifo "$FIFOPATH" || return
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$NNN_PAGER < "$FIFOPATH" &
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printf "%s" "$!" > "$PREVIEWPID"
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(
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exec > "$FIFOPATH"
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if [ "$cmd" = "pager" ]; then
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if exists bat; then
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bat --terminal-width="$cols" --decorations=always --color=always \
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--paging=never --style="$NNN_BATSTYLE" --theme="$NNN_BATTHEME" "$@" &
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else
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$NNN_PAGER "$@" &
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fi
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else
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"$cmd" "$@" &
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fi
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)
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rm "$FIFOPATH"
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}
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# Binary file: show file info inside the pager
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print_bin_info() {
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printf -- "-------- \033[1;31mBinary file\033[0m --------\n"
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if exists mediainfo; then
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mediainfo "$1"
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else
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file -b "$1"
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fi
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}
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handle_mime() {
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case "$2" in
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image/jpeg) image_preview "$cols" "$lines" "$1" ;;
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image/gif) generate_preview "$cols" "$lines" "$1" "gif" ;;
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image/vnd.djvu) generate_preview "$cols" "$lines" "$1" "djvu" ;;
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image/*) generate_preview "$cols" "$lines" "$1" "image" ;;
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video/*) generate_preview "$cols" "$lines" "$1" "video" ;;
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audio/*) generate_preview "$cols" "$lines" "$1" "audio" ;;
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application/font*|application/*opentype|font/*) generate_preview "$cols" "$lines" "$1" "font" ;;
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*/*office*|*/*document*|*/*msword|*/*ms-excel) generate_preview "$cols" "$lines" "$1" "office" ;;
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application/zip) fifo_pager unzip -l "$1" ;;
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text/troff)
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if exists man; then
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fifo_pager man -Pcat -l "$1"
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else
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fifo_pager pager "$1"
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fi ;;
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*) handle_ext "$1" "$3" "$4" ;;
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esac
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}
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handle_ext() {
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case "$2" in
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epub) generate_preview "$cols" "$lines" "$1" "epub" ;;
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pdf) generate_preview "$cols" "$lines" "$1" "pdf" ;;
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gz|bz2) fifo_pager tar -tvf "$1" ;;
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md) if exists glow; then
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fifo_pager glow -s dark "$1"
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elif exists lowdown; then
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fifo_pager lowdown -Tterm "$1"
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else
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fifo_pager pager "$1"
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fi ;;
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htm|html|xhtml)
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if exists w3m; then
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fifo_pager w3m "$1"
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elif exists lynx; then
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fifo_pager lynx "$1"
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elif exists elinks; then
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fifo_pager elinks "$1"
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else
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fifo_pager pager "$1"
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fi ;;
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7z|a|ace|alz|arc|arj|bz|cab|cpio|deb|jar|lha|lz|lzh|lzma|lzo\
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|rar|rpm|rz|t7z|tar|tbz|tbz2|tgz|tlz|txz|tZ|tzo|war|xpi|xz|Z)
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if exists atool; then
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fifo_pager atool -l "$1"
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elif exists bsdtar; then
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fifo_pager bsdtar -tvf "$1"
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fi ;;
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*) if [ "$3" = "bin" ]; then
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fifo_pager print_bin_info "$1"
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else
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fifo_pager pager "$1"
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fi ;;
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esac
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}
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preview_file() {
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clear
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# Trying to use pistol if it's available.
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if [ "$NNN_PISTOL" -ne 0 ] && exists pistol; then
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fifo_pager pistol "$1"
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return
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fi
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# Trying to use scope.sh if it's available.
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if [ "$NNN_SCOPE" -ne 0 ] && exists scope.sh; then
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fifo_pager scope.sh "$1" "$cols" "$lines" "$(mktemp -d)" "True"
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return
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fi
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# Use QuickLook if it's available.
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if [ -n "$QUICKLOOK" ]; then
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stat "$1" && f="$(wslpath -w "$1")" && "$QLPATH" "$f" &
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return
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fi
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# Detecting the exact type of the file: the encoding, mime type, and extension in lowercase.
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encoding="$(file -bL --mime-encoding -- "$1")"
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mimetype="$(file -bL --mime-type -- "$1")"
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ext="${1##*.}"
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[ -n "$ext" ] && ext="$(printf "%s" "${ext}" | tr '[:upper:]' '[:lower:]')"
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lines=$(tput lines)
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cols=$(tput cols)
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# Otherwise, falling back to the defaults.
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if [ -d "$1" ]; then
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cd "$1" || return
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if [ "$NNN_ICONLOOKUP" -ne 0 ] && [ -f "$(dirname "$0")"/.iconlookup ]; then
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[ "$NNN_SPLIT" = v ] && BSTR="\n"
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# shellcheck disable=SC2012
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ls -F --group-directories-first | head -n "$((lines - 3))" | "$(dirname "$0")"/.iconlookup -l "$cols" -B "$BSTR" -b " "
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elif exists tree; then
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fifo_pager tree --filelimit "$(find . -maxdepth 1 | wc -l)" -L 3 -C -F --dirsfirst --noreport
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elif exists exa; then
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exa -G --group-directories-first --colour=always
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else
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fifo_pager ls -F --group-directories-first --color=always
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fi
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cd ..
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elif [ "${encoding#*)}" = "binary" ]; then
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handle_mime "$1" "$mimetype" "$ext" "bin"
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else
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handle_mime "$1" "$mimetype" "$ext"
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fi
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}
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generate_preview() {
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if [ -n "$QLPATH" ] && stat "$3"; then
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f="$(wslpath -w "$3")" && "$QLPATH" "$f" &
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elif [ ! -f "$NNN_PREVIEWDIR/$3.jpg" ] || [ -n "$(find -L "$3" -newer "$NNN_PREVIEWDIR/$3.jpg")" ]; then
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mkdir -p "$NNN_PREVIEWDIR/${3%/*}"
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case $4 in
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audio) ffmpeg -i "$3" -filter_complex "scale=iw*min(1\,min($NNN_PREVIEWWIDTH/iw\,ih)):-1" "$NNN_PREVIEWDIR/$3.jpg" -y ;;
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epub) gnome-epub-thumbnailer "$3" "$NNN_PREVIEWDIR/$3.jpg" ;;
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font) fontpreview -i "$3" -o "$NNN_PREVIEWDIR/$3.jpg" ;;
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gif) if [ -p "$FIFO_UEBERZUG" ] && exists convert; then
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frameprefix="$NNN_PREVIEWDIR/$3/${3##*/}"
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if [ ! -d "$NNN_PREVIEWDIR/$3" ]; then
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mkdir -p "$NNN_PREVIEWDIR/$3"
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convert -coalesce -resize "$NNN_PREVIEWWIDTH"x"$NNN_PREVIEWHEIGHT"\> "$3" "$frameprefix.jpg" ||
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MAGICK_TMPDIR="/tmp" convert -coalesce -resize "$NNN_PREVIEWWIDTH"x"$NNN_PREVIEWHEIGHT"\> "$3" "$frameprefix.jpg"
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fi
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frames=$(($(find "$NNN_PREVIEWDIR/$3" | wc -l) - 2))
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[ $frames -lt 0 ] && return
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while true; do
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for i in $(seq 0 $frames); do
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image_preview "$1" "$2" "$frameprefix-$i.jpg"
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sleep 0.1
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done
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done &
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printf "%s" "$!" > "$PREVIEWPID"
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return
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else
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image_preview "$1" "$2" "$3"
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return
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fi ;;
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image) if exists convert; then
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convert "$3" -flatten -resize "$NNN_PREVIEWWIDTH"x"$NNN_PREVIEWHEIGHT"\> "$NNN_PREVIEWDIR/$3.jpg"
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else
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image_preview "$1" "$2" "$3" && return
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fi ;;
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office) libreoffice --convert-to jpg "$3" --outdir "$NNN_PREVIEWDIR/${3%/*}"
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filename="$(printf "%s" "${3##*/}" | cut -d. -f1)"
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mv "$NNN_PREVIEWDIR/${3%/*}/$filename.jpg" "$NNN_PREVIEWDIR/$3.jpg" ;;
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pdf) pdftoppm -jpeg -f 1 -singlefile "$3" "$NNN_PREVIEWDIR/$3" ;;
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djvu) ddjvu -format=ppm -page=1 "$3" "$NNN_PREVIEWDIR/$3.jpg" ;;
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video) ffmpegthumbnailer -m -s0 -i "$3" -o "$NNN_PREVIEWDIR/$3.jpg" || rm "$NNN_PREVIEWDIR/$3.jpg" ;;
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esac
|
|
fi
|
|
if [ -f "$NNN_PREVIEWDIR/$3.jpg" ]; then
|
|
image_preview "$1" "$2" "$NNN_PREVIEWDIR/$3.jpg"
|
|
else
|
|
fifo_pager print_bin_info "$3"
|
|
fi
|
|
} >/dev/null 2>&1
|
|
|
|
image_preview() {
|
|
clear
|
|
exec >/dev/tty
|
|
if [ "$NNN_TERMINAL" = "kitty" ] && [ -z "$NNN_PREVIEWIMGPROG" ]; then
|
|
kitty +kitten icat --silent --scale-up --place "$1"x"$2"@0x0 --transfer-mode=stream --stdin=no "$3" &
|
|
elif [ "$NNN_TERMINAL" = "wezterm" ] && [ -z "$NNN_PREVIEWIMGPROG" ]; then
|
|
wezterm imgcat "$3" &
|
|
elif exists ueberzug && { [ -z "$NNN_PREVIEWIMGPROG" ] || [ "$NNN_PREVIEWIMGPROG" = "ueberzug" ] ;}; then
|
|
ueberzug_layer "$1" "$2" "$3" && return
|
|
elif exists catimg && { [ -z "$NNN_PREVIEWIMGPROG" ] || [ "$NNN_PREVIEWIMGPROG" = "catimg" ] ;}; then
|
|
catimg "$3" &
|
|
elif exists viu && { [ -z "$NNN_PREVIEWIMGPROG" ] || [ "$NNN_PREVIEWIMGPROG" = "viu" ] ;}; then
|
|
viu -t "$3" &
|
|
elif exists chafa && { [ -z "$NNN_PREVIEWIMGPROG" ] || [ "$NNN_PREVIEWIMGPROG" = "chafa" ] ;}; then
|
|
chafa "$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 [ "$PREVIEW_MODE" -eq 1 ] 2>/dev/null; then
|
|
if [ "$NNN_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 "$NNN_FIFO" ]; then
|
|
prompt "No FIFO available! (\$NNN_FIFO='$NNN_FIFO')\nPlease read Usage in '$0'."
|
|
elif [ "$KITTY_WINDOW_ID" ] && [ -z "$TMUX" ] && [ -z "$KITTY_LISTEN_ON" ]; then
|
|
prompt "\$KITTY_LISTEN_ON not set!\nPlease read Usage in '$0'."
|
|
else
|
|
toggle_preview "$1" &
|
|
fi
|
|
fi
|