rotate-image

#!/usr/bin/env bash
# Interactively rotate a photograph and prompt to save it.
set -eu -o pipefail
tempfile="$(mktemp -t "XXXXXXXXXXXXXXXX.$(basename "$1")")"
trap "rm -f -- $tempfile" EXIT
cp -- "$1" "$tempfile"
while :; do
    sxiv -- "$tempfile"
    read -n 1 -r -p 'Rotate? (l|r|8|q|s) ' ROTATION
    printf '\n'
    DIRECTION=0
    case $ROTATION in
        l*)
            DIRECTION=-90
            ;;
        r*)
            DIRECTION=90
            ;;
        8*)
            DIRECTION=180
            ;;
        q*)
            exit
            ;;
        s*)
            cp -- "$tempfile" "$1"
            exit
    esac
    convert -rotate "$DIRECTION" -- "$1" "$tempfile"
done