fetch-achewood/postprocess.sh

#!/bin/bash
# Postprocesses all fetched comics from the fetch-comics.py file
set -euo pipefail

HERE="$(dirname "$0")"
DATA_DIR="$HERE/data"
IMAGE_DIR="$DATA_DIR/images"
OUT_DIR="$HERE/out"
#alt_json="$HERE/alt_text.json"
alt_json="$DATA_DIR/alt_text.json"

if [[ ! -f "$alt_json" ]]; then
    echo "Could not find $alt_json - have you run the fetch script?"
    exit 1
fi

mkdir -vp "$OUT_DIR"

# Get the list of all comic dates
readarray -t dates < <(jq -r 'keys[]' < "$alt_json")

#echo ${#dates[@]}
for date in "${dates[@]}"; do
    echo -n "Processing comic $date ... "
    image_in="$IMAGE_DIR/$date.gif"
    image_out="$OUT_DIR/$date.png"
    if [[ -f "$image_out" ]]; then
        echo "already exists, skipping"
        continue
    fi
    alt_text="$(jq -r ".[\"$date\"]" < "$alt_json")"

    if [[ -z "$alt_text" ]]; then
        convert "$image_in" \
            -background white -alpha remove -alpha off \
            "$image_out"
    else
        convert "$image_in" \
            -background white -alpha remove -alpha off \
            -gravity center \
            -pointsize 12 -size 360x caption:"$alt_text" \
            -append \
            "$image_out"
    fi

    echo "OK"
done