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scope.sh
executable file
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scope.sh
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#!/usr/bin/env bash
# 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
# shellcheck disable=SC2317
# 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="$5" # "True" if image previews are enabled, "False" otherwise.
maxln=$((height * 3))
# Find out something about the file:
mimetype=$(file --mime-type -Lb "$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 '"$@"'); }
# writes the output of the previously used "try" command
dump() { head -n "$maxln" <<<"$output"; }
# wraps highlight to treat exit code 141 (killed by SIGPIPE) as success
safepipe() {
"$@"
test $? = 0 -o $? = 141
}
# Image previews, if enabled in ranger.
if [ "$preview_images" = "True" ]; then
case "$mimetype" in
image/gif)
# my script to get the middle frame of a gif
cp "$(gifpreview "$path")" "$cached" && exit 6 || exit 1
;;
image/svg+xml)
convert "$path" "$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 "$mimetype" in
# Display information about media files:
video/* | audio/*)
exifinfo "$path" && exit 0
;;
# Syntax highlight for text files:
# For json files that dont end with *.json
# (wouldn't be recognized by highlight or pistol)
application/json)
try safepipe print-json "$path" && {
dump
exit 5
}
;;
application/csv)
try head -n$((maxln * 2)) "$path" && {
dump
exit 5
}
;;
application/x-sharedlib | application/x-executable | application/x-pie-executable)
exifinfo "$path" && exit 0
;;
application/zip)
try unzip -Z1 "$path" && {
dump
exit 5
}
;;
application/gzip)
try tar -tzf "$path" && {
dump
exit 5
}
;;
*)
case "$path" in
*.zip)
try unzip -Z1 "$path" && {
dump
exit 5
}
;;
# Python pickled objects
*.pickle)
# printing pickled data in preview
# window doesn't look good. can use
# rifle to preview it by running the file
echo "Pickled Python Data"
exifinfo "$path"
exit 5
;;
# PDF documents:
*.pdf)
try pdftoppm -jpeg -singlefile "$path" "${cached//.jpg/}" && exit 6 || exit 1
;;
*.docx)
try pandoc -t markdown "$path" && {
dump
exit 5
}
;;
*.1)
try safepipe man -P cat "$path" && {
dump
exit 0
}
;;
esac
try safepipe highlight --out-format=ansi "$path" && {
dump
exit 5
}
;;
esac
pistol_or_exifinfo() {
# if pistol takes way too long (0.3s) to calculate this
# its probably a huge textfile and its having issues determining
# how to preview it
if try timeout 0.3 pistol "$path"; then
dump
exit 5
else
# default to just showing some metadata about the file
exifinfo "$path"
exit 5
fi
}
pistol_or_exifinfo
exit 1