Generate evenly-spaced heic file for testing Mac dynamic wallpapers

test10.sh

#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'

JSONFILE="${1:-wallpapper.json}"
HEICFILE="${2:-wallpapper.heic}"

blocks=()
for ((a=-90;a<=90;a+=10)); do
    for ((z=0; z<360; z+=10)); do
        f="test_${a}_${z}.png"
        # Create image
        convert -background lightblue -fill blue \
            -pointsize 128 -font "Chalkduster" \
            -size 2880x1800 -gravity center \
            label:"Elevation:$a\nAzimuth:$z" "$f"
        if [[ a == 0 && z == 0 ]]; then
            primary=true
        else
            primary=false
        fi
        if [[ a < 0 ]]; then
            isForLight=true
            isForDark=false
        else
            isForLight=false
            isForDark=true
        fi
        IFS='' read -r -d '' BLOCK <<END || true
	{
		"fileName": "$f",
		"isPrimary": $primary,
		"isForLight": $isForLight,
		"isForDark": $isForDark,
		"altitude": $a,
		"azimuth": $z
	}
END
        blocks+=("$BLOCK")
    done
done

{
    echo "["
    echo -n "${blocks[0]}"
    for ((i=1;i<"${#blocks[@]}";i++)); do
        echo -n ",${blocks[$i]}"
    done
    echo "]"
} > "$JSONFILE"

/usr/local/bin/wallpapper -i "$JSONFILE" -o "$HEICFILE"