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preview-tui: simplify, add generic fifo_pager() (#625)

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* preview-tui: simplify, add generic fifo_pager()

I've commented new filetype checks for now, as we need to discuss which ones
should be included by default, keeping in mind that this is supposed to be a
minimal, adaptable plugin.

* preview-tui: preview with man, tar, unzip by default
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lvgx 2020-06-02 10:56:50 +02:00 committed by GitHub
parent 5dbb511ede
commit 01da467547
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 42 additions and 44 deletions
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94
plugins/preview-tui
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@ -4,19 +4,25 @@
#
# Note: This plugin needs a "NNN_FIFO" to work.
#
# Dependencies: tmux (>=3.0) or xterm or $TERMINAL, less or $PAGER, file, tree
# 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, they
# will be independent.
# 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
@ -25,37 +31,13 @@
# Authors: Todd Yamakawa, Léo Villeveygoux, @Recidiviste
TERMINAL="${TERMINAL:-xterm}"
PAGER="${PAGER:-less}"
SPLIT=
PAGER="${PAGER:-less -R}"
lines=$(($(tput lines)-1))
cols=$(tput cols)
fifo_pager() {
cmd="$1"
shift
beginswith() {
case $1 in "$2"*) true;; *) false;; esac;
}
preview_file () {
kill "$(jobs -p)" 2>/dev/null
clear
encoding="$(file -b --mime-encoding "$1")"
# Detect mime type
mimetype="$(file --dereference --brief --mime-type -- "$1")"
# Detect file extention
ext="${1##*.}"
if ! [ -z "$ext" ]; then
ext="$(printf "%s" "${ext}" | tr '[:upper:]' '[:lower:]')"
fi
if [ -d "$1" ]; then
# Print directory tree
cd "$1" || return
# We use a FIFO to access less PID
# We use a FIFO to access $PAGER PID in jobs control
tmpfifopath="${TMPDIR:-/tmp}/nnn-preview-tui-fifo.$$"
mkfifo "$tmpfifopath" || return
@ -63,24 +45,44 @@ preview_file () {
(
exec > "$tmpfifopath"
tree&
"$cmd" "$@" &
)
rm "$tmpfifopath"
#elif beginswith "$mimetype" "image/" ; then
# viu "$1" | head -n "$lines"
#elif beginswith "$mimetype" "text/troff" ; then
# man -l "$1" &
elif beginswith "$mimetype" "application/zip" ; then
#$PAGER "$(zip -sf "$1")" &
$PAGER "$(unzip -l "$1")" &
}
preview_file () {
kill %- %+ 2>/dev/null
clear
encoding="$(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
$PAGER "$(tar -tvf "$1")" &
fifo_pager tar -tvf "$1"
elif [ "$encoding" = "binary" ] ; then
# Binary file: just print filetype info
echo "-------- binary file --------"
file -b "$1"
echo ''
echo
stat "$1"
else
# Text file:
@ -105,13 +107,9 @@ if [ "$PREVIEW_MODE" ] ; then
fi
if [ -e "${TMUX%%,*}" ] && [ "$(tmux -V | cut -c6)" -eq 3 ] ; then
if [ -z "$SPLIT" ]; then
if [ "$(( lines * 2 ))" -gt "$cols" ]; then
if [ -z "$SPLIT" ] && [ $(($(tput lines) * 2)) -gt "$(tput cols)" ] ; then
SPLIT='v'
else
SPLIT='h'
fi
elif [ "$SPLIT" != "h" ] && [ "$SPLIT" != "v" ] ; then
elif [ "$SPLIT" != 'v' ] ; then
SPLIT='h'
fi