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#!/usr/bin/env sh
# Description: Text based file previewer
#
# Note: This plugin needs a "NNN_FIFO" to work.
#
# Dependencies: tmux (>=3.0) or xterm or $TERMINAL, less or $PAGER,
# file, stat, tree, man, tar, unzip, ...
# ... add you own! (see examples in code)
#
# Usage:
# You need to set a NNN_FIFO path and set a key for the plugin,
# then start `nnn`:
#
# $ nnn -a
#
# or
#
# $ 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 (e.g.
# with -a), they will be independent.
#
# Configure SPLIT to either "h" or "v" to set a 'h'orizontal split or a
# 'v'ertical split
#
# Shell: POSIX compliant
# Authors: Todd Yamakawa, Léo Villeveygoux, @Recidiviste
TERMINAL="${TERMINAL:-xterm}"
PAGER="${PAGER:-less -R}"
fifo_pager() {
cmd="$1"
shift
# We use a FIFO to access $PAGER PID in jobs control
tmpfifopath="${TMPDIR:-/tmp}/nnn-preview-tui-fifo.$$"
mkfifo "$tmpfifopath" || return
$PAGER < "$tmpfifopath" &
(
exec > "$tmpfifopath"
"$cmd" "$@" &
)
rm "$tmpfifopath"
}
preview_file () {
kill %- %+ 2>/dev/null
clear
encoding="$(file -Lb --mime-encoding -- "$1")"
# Detect mime type
mimetype="$(file -Lb --mime-type -- "$1")"
# Detect file extention - use if you need
ext="${1##*.}"
if [ -n "$ext" ]; then
ext="$(printf "%s" "${ext}" | tr '[:upper:]' '[:lower:]')"
fi
if [ -d "$1" ]; then
# Print directory tree
cd "$1" || return
fifo_pager tree
#elif [ "${mimetype%%/*}" = "image" ] ; then
# catimg "$1"
elif [ "$mimetype" = "text/troff" ] ; then
fifo_pager man -Pcat -l "$1"
elif [ "$mimetype" = "application/zip" ] ; then
fifo_pager unzip -l "$1"
elif [ "$ext" = "gz" ] || [ "$ext" = "bz2" ] ; then
fifo_pager tar -tvf "$1"
elif [ "$encoding" = "binary" ] ; then
# Binary file: just print filetype info
echo "-------- binary file --------"
file -b "$1"
echo
stat "$1"
else
# Text file:
$PAGER "$1" &
fi
}
if [ "$PREVIEW_MODE" ] ; then
if [ ! -r "$NNN_FIFO" ] ; then
echo "No FIFO available! (\$NNN_FIFO='$NNN_FIFO')" >&2
read -r
exit 1
fi
preview_file "$1"
exec < "$NNN_FIFO"
while read -r selection ; do
preview_file "$selection"
done
exit 0
fi
if [ -e "${TMUX%%,*}" ] && tmux -V | grep -q '[ -][3456789]\.' ; then
if [ -z "$SPLIT" ] && [ $(($(tput lines) * 2)) -gt "$(tput cols)" ] ; then
SPLIT='v'
elif [ "$SPLIT" != 'v' ] ; then
SPLIT='h'
fi
tmux split-window -e "NNN_FIFO=$NNN_FIFO" -e "PREVIEW_MODE=1" -d"$SPLIT" "$0" "$1"
else
PREVIEW_MODE=1 $TERMINAL -e "$0" "$1" &
fi
|
