dotfiles/home/.config/lf/previewer.sh

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#!/bin/sh
# This script handles showing file-previews within lf.
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# It can also show image previews using ueberzug, however
# that requires lf to be started with a script that also starts
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# ueberzug alongside of it.
# (In my dotfiles, this script is in '~/.local/bin/scripts/lfu')
# Alternatively, we could also handle ANSI previews with pixterms
# this will be in a pretty low quiality, but it will work without
# ueberzug. To enable this, change PIXTERM_ENABLED to 1.
# if both ueberzug and pixterm are enabled, ueberzug takes precedence.
PIXTERM_ENABLED=1
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run_cmd() {
# Try to run given command, if it is installed.
# If it isn't try to fallback to text_handle,
# otherwise fail completely.
cmd="$1"
shift
if command -v "$cmd" > /dev/null; then
$cmd $@
else
# If we didn't found the requested command, check if
# the file is text-like and try to use the text_handle
# to show the preview, this may not be ideal for given
# file-format, but at least we won't fail.
case $(file --mime-type "$1" -bL) in
# TODO: Consider checking for UTF-8 formatting instead,
# or show previews for any file-type
text/*|application/json)
echo "@@PREVIEW FALLBACK: Using text handle, $cmd command not found!"
text_handle "$1"
;;
*)
echo "@@PREVIEW ERROR: Preview failed, $cmd command not found!"
;;
esac
fi
}
draw_image() {
# Draw passed image with use of given draw_script.
# If the image contains EXIF (metadata) orientation info,
# handle it and draw the rotated image.
draw_script="$1"
file="$2"
shift
shift
# Calculate where the image should be placed on the screen.
num=$(printf "%0.f\n" "`echo "$(tput cols) / 2" | bc`")
numb=$(printf "%0.f\n" "`echo "$(tput cols) - $num - 1" | bc`")
numc=$(printf "%0.f\n" "`echo "$(tput lines) - 2" | bc`")
# Handle EXIF (metadata) orientation.
exif_orientation="$(identify -format '%[EXIF:Orientation]\n' -- "$file")"
if [ -n "$exif_orientation" ] && [ "$exif_orientation" != 1 ]; then
# In case `convert` command isn't aviable, ignore EXIF rotation
if command -v convert > /dev/null; then
cache=$(mktemp /tmp/thumbcache.XXXXX)
convert -- "$file" -auto-orient "$cache"
$draw_script "$cache" $num 1 $numb $numc
else
$draw_script "$file" $num 1 $numb $numc
fi
else
$draw_script "$file" $num 1 $numb $numc
fi
# Exit with status code 1 to signal lf that the function
# should be re-ran next time instead of caching the result.
exit 1
}
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media_handle() {
# Handle media type files (videos, photos). These types of
# files are usually not stored in any form of textually readable
# format and they require a special way of displaying them.
# This mostly uses ueberzug (if available) for this.
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draw_script="${XDG_CONFIG_HOME:-$HOME/.config}/lf/draw_img.sh"
file="$1"
shift
# Set ENABLED=1 if ueberzug or pixterm is enabled
command -v pixterm > /dev/null && [ "$PIXTERM_ENABLED" = 1 ] && ENABLED=1
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[ -n "$FIFO_UEBERZUG" ] && [ -f "$draw_script" ] && ENABLED=1
case "$file" in
*.bmp|*.jpg|*.jpeg|*.png|*.xpm)
if [ -n "$ENABLED" ]; then
draw_image $draw_script "$file"
else
echo "@@PREVIEW FALLBACK: Using mediainfo, ueberzug isn't available."
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run_cmd mediainfo "$file"
fi
;;
*.avi|*.mp4|*.wmv|*.dat|*.3gp|*.ogv|*.mkv|*.mpg|*.mpeg|*.vob|*.fl[icv]|*.m2v|\
*.mov|*.webm|*.ts|*.mts|*.m4v|*.r[am]|*.qt|*.divx)
if [ -n "$ENABLED" ]; then
cache="$(mktemp /tmp/thumbcache.XXXXX)"
ffmpegthumbnailer -i "$file" -o "$cache" -s 0
draw_image $draw_script "$cache"
else
echo "@@PREVIEW FALLBACK: Using exiftool, ueberzug isn't aviable."
run_cmd exiftool "$file"
fi
;;
*.wav|*.mp3|*.flac|*.m4a|*.wma|*.ape|*.ac3|*.og[agx]|*.spx|*.opus|*.as[fx]|*.flac)
# These types can't make use of ueberzug easily, so simply use eixftool
run_cmd exiftool "$file"
;;
*)
echo "@@PREVIEW FALLBACK: Unrecognized media file, falling back to text handle."
text_handle "$file"
;;
esac
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}
text_handle() {
# Handle all other formats as text and cat them
# if highlighting tools are aviable, try to use them
if command -v bat > /dev/null; then
bat -pp --color=always "$1"
elif command -v highlight > /dev/null; then
highlight "$1" --out-format ansi --force
else
cat "$1"
fi
}
# Capture all directories at first, since they could
# potentionally match one of the file case statements
if [ -d "$1" ]; then
tree "$1" -La 1
elif [ -f "$1" ]; then
case "$1" in
*.tgz|*.tar.gz) run_cmd tar tzf "$1";;
*.tar.bz2|*.tbz2) run_cmd tar tjf "$1";;
*.tar.txz|*.txz) run_cmd xz --list "$1";;
*.tar) run_cmd tar tf "$1";;
*.zip|*.jar|*.war|*.ear|*.oxt) run_cmd unzip -l "$1";;
*.rar) run_cmd unrar l "$1";;
*.7z) run_cmd 7z l "$1";;
*.iso) run_cmd iso-info --no-header -l "$1";;
*.o) run_cmd nm "$1" | less ;;
*.csv) cat "$1" | sed s/,/\\n/g ;;
*odt,*.ods,*.odp,*.sxw) run_cmd odt2txt "$1";;
*.doc) run_cmd catdoc "$1" ;;
*.docx) run_cmd docx2txt "$1" - ;;
*.torrent) run_cmd transmission-show "$1";;
*.pdf) run_cmd pdftotext "$1";;
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*.wav|*.mp3|*.flac|*.m4a|*.wma|*.ape|*.ac3|*.og[agx]|*.spx|*.opus|*.as[fx]|*.flac|\
*.avi|*.mp4|*.wmv|*.dat|*.3gp|*.ogv|*.mkv|*.mpg|*.mpeg|*.vob|*.fl[icv]|*.m2v|*.mov|\
*.webm|*.ts|*.mts|*.m4v|*.r[am]|*.qt|*.divx|\
*.bmp|*.jpg|*.jpeg|*.png|*.xpm) media_handle "$1" ;;
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*) text_handle "$1" ;;
esac
fi