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#!/usr/bin/env sh
# Description: File previewer for kitty term using NNN_FIFO
#
# Dependencies:
# - kitty (https://sw.kovidgoyal.net/kitty/) with allow_remote_control on
# - file
# - exa (https://github.com/ogham/exa) (fallback: ls)
# - bat (https://github.com/sharkdp/bat) (fallback: cat)
# - mediainfo (fallback: file)
#
# Usage:
# This plugin only works in kitty (https://sw.kovidgoyal.net/kitty/),
# and with kitty's 'allow_remote_control' option turned on.
# 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-kitty` plugin.
#
# 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, they
# will be independent.
#
# Shell: POSIX compliant
# Authors: Léo Villeveygoux
preview_file () {
kill %% 2>/dev/null
clear
lines=$(($(tput lines)-1))
cols=$(tput cols)
mime="$(file -b --mime-type "$1")"
encoding="$(file -b --mime-encoding "$1")"
if [ -d "$1" ]; then
# Print directory tree
# shellcheck disable=SC2015
cd "$1" && \
(COLUMNS=$cols exa -G --colour=always 2>/dev/null ||\
ls --color=alway) | head -n $lines &
# remove second clause to preview SVG files (but this is slow)
elif [ "${mime%%/*}" = "image" ] && [ "$encoding" = "binary" ] ; then
kitty +kitten icat --silent --transfer-mode=stream --stdin=no "$1" &
elif [ "$encoding" = "binary" ] ; then
# Binary file: show file info
printf -- "-------- \033[1;31mBinary file\033[0m --------\n"
(mediainfo "$1" 2>/dev/null || file -b "$1") | head -n $((lines - 1)) &
else
# Text file: print colored file content
(bat --terminal-width="$cols" --paging=never --decorations=always \
--color=always "$1" 2>/dev/null || cat) | head -n $lines &
fi
}
if [ "$PREVIEW_MODE" ] ; then
if [ ! -r "$NNN_FIFO" ] ; then
echo "No FIFO available! (\$NNN_FIFO='$NNN_FIFO')" >&2
read -r
exit 1
fi
preview_file "$1"
# use cat instead of 'exec <' to avoid issues with dash shell
# shellcheck disable=SC2002
cat "$NNN_FIFO" |\
while read -r selection ; do
preview_file "$selection"
done
exit 0
fi
kitty @ launch --no-response --title "nnn preview" --keep-focus \
--cwd="$PWD" --env "NNN_FIFO=$NNN_FIFO" --env "PREVIEW_MODE=1" \
"$0" "$1" > /dev/null
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