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#!/usr/bin/env sh
# ranger supports enhanced previews. If the option "use_preview_script"
# is set to True and this file exists, this script will be called and its
# output is displayed in ranger. ANSI color codes are supported.
# NOTES: This script is considered a configuration file. If you upgrade
# ranger, it will be left untouched. (You must update it yourself.)
# Also, ranger disables STDIN here, so interactive scripts won't work properly
# Meanings of exit codes:
# code | meaning | action of ranger
# -----+------------+-------------------------------------------
# 0 | success | success. display stdout as preview
# 1 | no preview | failure. display no preview at all
# 2 | plain text | display the plain content of the file
# 3 | fix width | success. Don't reload when width changes
# 4 | fix height | success. Don't reload when height changes
# 5 | fix both | success. Don't ever reload
# 6 | image | success. display the image $cached points to as an image preview
# 7 | image | success. display the file directly as an image
# Meaningful aliases for arguments:
path="$1" # Full path of the selected file
width="$2" # Width of the preview pane (number of fitting characters)
height="$3" # Height of the preview pane (number of fitting characters)
cached="$4" # Path that should be used to cache image previews
preview_images="$5" # "True" if image previews are enabled, "False" otherwise.
maxln=200 # Stop after $maxln lines. Can be used like ls | head -n $maxln
# Find out something about the file:
mimetype=$(file --mime-type -Lb "$path")
extension=$(/bin/echo "${path##*.}" | awk '{print tolower($0)}')
# Functions:
# runs a command and saves its output into $output. Useful if you need
# the return value AND want to use the output in a pipe
try() { output=$(eval '"$@"'); }
# writes the output of the previously used "try" command
dump() { /bin/echo "$output"; }
# a common post-processing function used after most commands
trim() { head -n "$maxln"; }
# wraps highlight to treat exit code 141 (killed by SIGPIPE) as success
safepipe() { "$@"; test $? = 0 -o $? = 141; }
# Image previews, if enabled in ranger.
if [ "$preview_images" = "True" ]; then
case "$mimetype" in
# Image previews for SVG files, disabled by default.
###image/svg+xml)
### convert "$path" "$cached" && exit 6 || exit 1;;
# Image previews for image files. w3mimgdisplay will be called for all
# image files (unless overriden as above), but might fail for
# unsupported types.
application/epub+zip|application/x-mobipocket-ebook|\
application/x-fictionbook+xml)
gnome-epub-thumbnailer "$path" /tmp/thbn -s 600 && mv /tmp/thbn "$cached" && exit 6 || exit 1;;
application/pdf)
pdftoppm -f 1 -singlefile -jpeg "$path" /tmp/.thbn && mv /tmp/.thbn.jpg "$cached" && exit 6 || exit 1;;
image/avif)
convert "$path" "$cached" && exit 6 ||exit 1;;
image/svg+xml)
rsvg-convert "$path" -d 1 -p 2 > "$cached" && exit 6 ||exit 1;;
image/*)
exit 7;;
# Image preview for video, disabled by default.:
video/*)
ffmpegthumbnailer -i "$path" -o "$cached" -s 0 && exit 6 || exit 1;;
esac
fi
case "$extension" in
# Archive extensions:
a|ace|alz|arc|arj|bz|bz2|cab|cpio|deb|gz|jar|lha|lz|lzh|lzma|lzo|\
rpm|rz|t7z|tar|tbz|tbz2|tgz|tlz|txz|tZ|tzo|war|xpi|xz|Z|zip)
try als "$path" && { dump | trim; exit 0; }
try acat "$path" && { dump | trim; exit 3; }
try bsdtar -lf "$path" && { dump | trim; exit 0; }
exit 1;;
rar)
# avoid password prompt by providing empty password
try unrar -p- lt "$path" && { dump | trim; exit 0; } || exit 1;;
7z)
# avoid password prompt by providing empty password
try 7z -p l "$path" && { dump | trim; exit 0; } || exit 1;;
# PDF documents:
pdf)
try pdftotext -l 10 -nopgbrk -q "$path" - && \
{ dump | trim | fmt -s -w $width; exit 0; } || exit 1;;
avif)
try convert "$path" "$cached" && exit 6 || exit 1;;
# BitTorrent Files
torrent)
try transmission-show "$path" && { dump | trim; exit 5; } || exit 1;;
# ODT Files
odt|ods|odp|sxw)
try odt2txt "$path" && { dump | trim; exit 5; } || exit 1;;
# HTML Pages:
htm|html|xhtml)
try w3m -dump "$path" && { dump | trim | fmt -s -w $width; exit 4; }
try lynx -dump "$path" && { dump | trim | fmt -s -w $width; exit 4; }
try elinks -dump "$path" && { dump | trim | fmt -s -w $width; exit 4; }
;; # fall back to highlight/cat if the text browsers fail
esac
case "$mimetype" in
# Syntax highlight for text files:
text/* | */xml)
if [ "$(tput colors)" -ge 256 ]; then
pygmentize_format=terminal256
highlight_format=xterm256
else
pygmentize_format=terminal
highlight_format=ansi
fi
try safepipe highlight --out-format=${highlight_format} "$path" && { dump | trim; exit 5; }
try safepipe pygmentize -f ${pygmentize_format} "$path" && { dump | trim; exit 5; }
exit 2;;
# Ascii-previews of images:
image/*)
img2txt --gamma=0.6 --width="$width" "$path" && exit 4 || exit 1;;
# Display information about media files:
video/* | audio/*)
exiftool "$path" && exit 5
# Use sed to remove spaces so the output fits into the narrow window
try mediainfo "$path" && { dump | trim | sed 's/ \+:/: /;'; exit 5; } || exit 1;;
esac
exit 1
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