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#!/bin/bash
# This script is called whenever you preview a file.
# Its output is used as the preview. 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 "$path")
extension=$(echo "$path" | grep '\.' | grep -o '[^.]\+$')
# Functions:
# "have $1" succeeds if $1 is an existing command/installed program
function have { type -P "$1" > /dev/null; }
# "success" returns the exit code of the first program in the last pipe chain
function success { test ${PIPESTATUS[0]} = 0; }
case "$extension" in
# Archive extensions:
7z|a|ace|alz|arc|arj|bz|bz2|cab|cpio|deb|gz|jar|lha|lz|lzh|lzma|lzo|\
rar|rpm|rz|t7z|tar|tbz|tbz2|tgz|tlz|txz|tZ|tzo|war|xpi|xz|Z|zip)
als "$path" | head -n $maxln
success && exit 0 || acat "$path" | head -n $maxln && exit 3
exit 1;;
# PDF documents:
pdf)
pdftotext -l 10 -nopgbrk -q "$path" - | head -n $maxln | fmt -s -w $width
success && exit 0 || exit 1;;
# BitTorrent Files
torrent)
transmission-show "$path" | head -n $maxln && exit 3
success && exit 5 || exit 1;;
# HTML Pages:
htm|html|xhtml)
have w3m && w3m -dump "$path" | head -n $maxln | fmt -s -w $width && exit 4
have lynx && lynx -dump "$path" | head -n $maxln | fmt -s -w $width && exit 4
have elinks && elinks -dump "$path" | head -n $maxln | fmt -s -w $width && exit 4
;; # fall back to highlight/cat if theres no lynx/elinks
esac
case "$mimetype" in
# Syntax highlight for text files:
text/* | */xml)
highlight --out-format=ansi "$path" | head -n $maxln
success && exit 5 || exit 2;;
# Ascii-previews of images:
image/*)
img2txt --gamma=0.6 --width="$width" "$path" && exit 4 || exit 1;;
# Display information about media files:
video/* | audio/*)
# Use sed to remove spaces so the output fits into the narrow window
mediainfo "$path" | sed 's/ \+:/: /;'
success && exit 5 || exit 1;;
esac
exit 1
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