auto-rotate-image

#!/usr/bin/env fish
# auto-rotate-image - Correct image rotation based on its metadata. Outputs the filename of the result.
# Some software will write rotation information into an image incorrectly, which causes the image to show up wrong in certain programs. This script uses the rotation metadatum to write a rotated image sans that metadatum. The resulting image(s) are echoed to standard output.

# settings:

# The directory to save the resulting files in. When unset (as per the default), saves in /tmp/SCRIPT/ , where SCRIPT is the filename of this script.
set result_dir

# code:

set -- script "$(path basename (status filename))"

argparse -n auto-rotate-image 'h/help' -- $argv

if test -z "$result_dir"
    set result_dir "/tmp/$script"
end

if set -q _flag_h
    echo "$script - Correct image rotation based on its metadata. Outputs the filename of the result."
    echo "Usage: $script image [image ...]"
    echo
    echo "  -h/--help - Print help and exit."
    exit
end

mkdir -p "$result_dir"

for file in $argv
    set file (path basename "$file")
    set output "$result_dir$file"
    convert "$file" -auto-orient "$output"
    echo "$output"
end