nnn/plugins/preview-tui

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#!/usr/bin/env sh
# Description: Text based file previewer
#
# Note: This plugin needs a "NNN_FIFO" to work.
#
# Dependencies: tmux or xterm (or set $TERMINAL), file, tree
#
# How to use:
# You need to set a NNN_FIFO path and set a key for the plugin,
# then start `nnn`:
#
# $ NNN_FIFO=/tmp/nnn.fifo nnn
#
# Then in `nnn`, launch the `preview-tui` plugin.
#
# If you provide the same NNN_FIFO to all nnn instances, there will be a
# single common preview window. I you provide different FIFO path, they
# will be independent.
#
# Authors: Todd Yamakawa and Léo Villeveygoux
TERMINAL="${TERMINAL:-xterm}"
NUKE="${XDG_CONFIG_HOME:-$HOME/.config}/nnn/plugins/nuke"
if [ ! -r "$NNN_FIFO" ] ; then
echo "No FIFO available! (\$NNN_FIFO='$NNN_FIFO')" >&2
exit 1
fi
if [ ! -x "$NUKE" ] ; then
echo "Nuke not found!" >&2
exit 1
fi
if [ "$PREVIEW_MODE" ] ; then
exec < "$NNN_FIFO"
while read -r selection ; do
clear
lines=$(($(tput lines)-1))
cols=$(tput cols)
mime="$(file -b --mime-type "$selection")"
if [ "$mime" = "inode/directory" ] ; then
# Print directory tree
cd "$selection" && tree | head -n $lines | cut -c 1-"$cols"
elif [ "${mime%%/*}" = "text" ] ; then
# Print file head
head -n $lines "$selection" | cut -c 1-"$cols"
else
# Binary file
echo "-------- Binary file --------"
file -b "$selection"
fi
done
if [ -e "${TMUX%%,*}" ] ; then
tmux kill-pane
fi
exit 0
fi
if [ -e "${TMUX%%,*}" ] ; then
tmux split-window -e "NNN_FIFO=$NNN_FIFO" -e "PREVIEW_MODE=1" -dh "$0"
else
PREVIEW_MODE=1 GUI=0 $TERMINAL -e "$0" &
fi