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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
# 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)
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 "$path")
extension=${path##*.}
# 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 '"$@"'); }
# writes the output of the previouosly used "try" command
dump() { echo "$output"; }
# a common post-processing function used after most commands
trim() { head -n "$maxln"; }
# wraps highlight to treat exit code 141 (killed by SIGPIPE) as success
highlight() { command highlight "$@"; test $? = 0 -o $? = 141; }
case "$extension" in
# Archive extensions:
7z|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 "$path" && { dump | trim; exit 0; }
exit 1;;
rar)
try unrar -p- lt "$path" && { dump | trim; exit 0; } || exit 1;;
# PDF documents:
pdf)
try pdftotext -l 10 -nopgbrk -q "$path" - && \
{ dump | trim | fmt -s -w $width; exit 0; } || exit 1;;
# BitTorrent Files
torrent)
try transmission-show "$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)
try highlight --out-format=ansi "$path" && { dump | trim; exit 5; } || exit 2;;
# Ascii-previews of images:
image/*)
img2txt --gamma=0.6 --width="$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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