fzf/bin/fzf-preview.sh
Junegunn Choi e7718b92b7
Kitty image support improvements
* Use `--unicode-placeholder` for consistent result in and out of tmux
* Use updated version of junegunn/go-runewidth that handles diacritics
  used in Kitty Unicode placeholder

Close #3567
2024-01-17 00:17:22 +09:00

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#!/usr/bin/env bash
#
# The purpose of this script is to demonstrate how to preview a file or an
# image in the preview window of fzf.
#
# Dependencies:
# - https://github.com/sharkdp/bat
# - https://github.com/hpjansson/chafa
# - https://iterm2.com/utilities/imgcat
if [[ $# -ne 1 ]]; then
>&2 echo "usage: $0 FILENAME"
exit 1
fi
file=${1/#\~\//$HOME/}
type=$(file --dereference --mime -- "$file")
if [[ ! $type =~ image/ ]]; then
if [[ $type =~ =binary ]]; then
file "$1"
exit
fi
# Sometimes bat is installed as batcat.
if command -v batcat > /dev/null; then
batname="batcat"
elif command -v bat > /dev/null; then
batname="bat"
else
cat "$1"
exit
fi
${batname} --style="${BAT_STYLE:-numbers}" --color=always --pager=never -- "$file"
exit
fi
dim=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}
if [[ $dim = x ]]; then
dim=$(stty size < /dev/tty | awk '{print $2 "x" $1}')
elif ! [[ $KITTY_WINDOW_ID ]] && (( FZF_PREVIEW_TOP + FZF_PREVIEW_LINES == $(stty size < /dev/tty | awk '{print $1}') )); then
# Avoid scrolling issue when the Sixel image touches the bottom of the screen
# * https://github.com/junegunn/fzf/issues/2544
dim=${FZF_PREVIEW_COLUMNS}x$((FZF_PREVIEW_LINES - 1))
fi
# 1. Use kitty icat on kitty terminal
if [[ $KITTY_WINDOW_ID ]]; then
# 1. 'memory' is the fastest option but if you want the image to be scrollable,
# you have to use 'stream'.
#
# 2. The last line of the output is the ANSI reset code without newline.
# This confuses fzf and makes it render scroll offset indicator.
# So we remove the last line and append the reset code to its previous line.
kitty icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place="$dim@0x0" "$file" | sed '$d' | sed $'$s/$/\e[m/'
# 2. Use chafa with Sixel output
elif command -v chafa > /dev/null; then
chafa -f sixel -s "$dim" "$file"
# Add a new line character so that fzf can display multiple images in the preview window
echo
# 3. If chafa is not found but imgcat is available, use it on iTerm2
elif command -v imgcat > /dev/null; then
# NOTE: We should use https://iterm2.com/utilities/it2check to check if the
# user is running iTerm2. But for the sake of simplicity, we just assume
# that's the case here.
imgcat -W "${dim%%x*}" -H "${dim##*x}" "$file"
# 4. Cannot find any suitable method to preview the image
else
file "$file"
fi