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Add nnn
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216
dot_config/nnn/plugins/executable_preview-tabbed
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216
dot_config/nnn/plugins/executable_preview-tabbed
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#!/usr/bin/env bash
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# Description: tabbed/xembed based file previewer
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#
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# Dependencies:
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# - tabbed (https://tools.suckless.org/tabbed): xembed host
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# - xterm (or urxvt or st) : xembed client for text-based preview
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# - mpv (https://mpv.io): xembed client for video/audio
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# - sxiv (https://github.com/muennich/sxiv) or,
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# - nsxiv (https://codeberg.org/nsxiv/nsxiv) : xembed client for images
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# - zathura (https://pwmt.org/projects/zathura): xembed client for PDF
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# - nnn's nuke plugin for text preview and fallback
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# nuke is a fallback for 'mpv', 'sxiv'/'nsxiv', and 'zathura', but has its
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# own dependencies, see the script for more information
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# - vim (or any editor/pager really)
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# - file
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# - mktemp
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# - xdotool (optional, to keep main window focused)
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#
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# Usage:
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# - Install the dependencies. Then set a NNN_FIFO
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# and set a key for the plugin, then start `nnn`:
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# $ NNN_FIFO=/tmp/nnn.fifo nnn
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# - Launch the plugin with the designated key from nnn
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#
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# Notes:
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# 1. This plugin needs a "NNN_FIFO" to work. See man.
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# 2. If the same NNN_FIFO is used in multiple nnn instances, there will be one
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# common preview window. With different FIFO paths, they will be independent.
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# 3. This plugin only works on X, not on Wayland.
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#
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# How it works:
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# We use `tabbed` [1] as a xembed [2] host, to have a single window
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# owning each previewer window. So each previewer must be a xembed client.
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# For text previewers, this is not an issue, as there are a lot of
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# xembed-able terminal emulator (we default to `xterm`, but examples are
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# provided for `urxvt` and `st`). For graphic preview this can be trickier,
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# but a few popular viewers are xembed-able, we use:
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# - `mpv`: multimedia player, for video/audio preview
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# - `sxiv`/`nsxiv`: image viewer
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# - `zathura`: PDF viewer
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# - but we always fallback to `nuke` plugin
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#
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# [1]: https://tools.suckless.org/tabbed/
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# [2]: https://specifications.freedesktop.org/xembed-spec/xembed-spec-latest.html
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#
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# Shell: Bash (job control is weakly specified in POSIX)
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# Author: Léo Villeveygoux
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XDOTOOL_TIMEOUT=2
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PAGER=${PAGER:-"vim -R"}
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NUKE="${XDG_CONFIG_HOME:-$HOME/.config}/nnn/plugins/nuke"
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if [ -n "$WAYLAND_DISPLAY" ] ; then
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echo "Wayland is not supported in preview-tabbed, this plugin could freeze your session!" >&2
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exit 1
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fi
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if type xterm >/dev/null 2>&1 ; then
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TERMINAL="xterm -into"
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elif type urxvt >/dev/null 2>&1 ; then
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TERMINAL="urxvt -embed"
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elif type st >/dev/null 2>&1 ; then
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TERMINAL="st -w"
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else
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echo "No xembed term found" >&2
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fi
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term_nuke () {
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# $1 -> $XID, $2 -> $FILE
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$TERMINAL "$1" -e "$NUKE" "$2" &
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}
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start_tabbed () {
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FIFO="$(mktemp -u)"
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mkfifo "$FIFO"
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tabbed > "$FIFO" &
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jobs # Get rid of the "Completed" entries
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TABBEDPID="$(jobs -p %%)"
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if [ -z "$TABBEDPID" ] ; then
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echo "Can't start tabbed"
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exit 1
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fi
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read -r XID < "$FIFO"
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rm "$FIFO"
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}
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get_viewer_pid () {
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VIEWERPID="$(jobs -p %%)"
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}
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kill_viewer () {
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if [ -n "$VIEWERPID" ] && jobs -p | grep "$VIEWERPID" ; then
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kill "$VIEWERPID"
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fi
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}
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sigint_kill () {
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kill_viewer
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kill "$TABBEDPID"
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exit 0
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}
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previewer_loop () {
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unset -v NNN_FIFO
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# mute from now
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exec >/dev/null 2>&1
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MAINWINDOW="$(xdotool getactivewindow)"
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start_tabbed
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trap sigint_kill SIGINT
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xdotool windowactivate "$MAINWINDOW"
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# Bruteforce focus stealing prevention method,
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# works well in floating window managers like XFCE
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# but make interaction with the preview window harder
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# (uncomment to use):
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#xdotool behave "$XID" focus windowactivate "$MAINWINDOW" &
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while read -r FILE ; do
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jobs # Get rid of the "Completed" entries
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if ! jobs | grep tabbed ; then
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break
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fi
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if [ ! -e "$FILE" ] ; then
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continue
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fi
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kill_viewer
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MIME="$(file -bL --mime-type "$FILE")"
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case "$MIME" in
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video/*)
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if type mpv >/dev/null 2>&1 ; then
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mpv --force-window=immediate --loop-file --wid="$XID" "$FILE" &
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else
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term_nuke "$XID" "$FILE"
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fi
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;;
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audio/*)
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if type mpv >/dev/null 2>&1 ; then
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mpv --force-window=immediate --loop-file --wid="$XID" "$FILE" &
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else
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term_nuke "$XID" "$FILE"
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fi
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;;
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image/*)
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if type sxiv >/dev/null 2>&1 ; then
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sxiv -ae "$XID" "$FILE" &
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elif type nsxiv >/dev/null 2>&1 ; then
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nsxiv -ae "$XID" "$FILE" &
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else
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term_nuke "$XID" "$FILE"
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fi
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;;
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application/pdf)
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if type zathura >/dev/null 2>&1 ; then
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zathura -e "$XID" "$FILE" &
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else
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term_nuke "$XID" "$FILE"
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fi
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;;
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inode/directory)
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$TERMINAL "$XID" -e nnn "$FILE" &
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;;
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text/*)
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if [ -x "$NUKE" ] ; then
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term_nuke "$XID" "$FILE"
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else
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# shellcheck disable=SC2086
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$TERMINAL "$XID" -e $PAGER "$FILE" &
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fi
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;;
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*)
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if [ -x "$NUKE" ] ; then
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term_nuke "$XID" "$FILE"
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else
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$TERMINAL "$XID" -e sh -c "file '$FILE' | $PAGER -" &
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fi
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;;
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esac
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get_viewer_pid
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# following lines are not needed with the bruteforce xdotool method
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ACTIVE_XID="$(xdotool getactivewindow)"
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if [ $((ACTIVE_XID == XID)) -ne 0 ] ; then
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xdotool windowactivate "$MAINWINDOW"
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else
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timeout "$XDOTOOL_TIMEOUT" xdotool behave "$XID" focus windowactivate "$MAINWINDOW" &
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fi
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done
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kill "$TABBEDPID"
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kill_viewer
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}
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if [ ! -r "$NNN_FIFO" ] ; then
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echo "Can't read \$NNN_FIFO ('$NNN_FIFO')"
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exit 1
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fi
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previewer_loop < "$NNN_FIFO" &
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disown
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