input.sh

#!/bin/bash

# Check if an argument is passed
if [ "$#" -ne 1 ]; then
    echo "Usage: $0 <date in YYYYDD format>"
    exit 1
fi

# Extract year and day from the argument
INPUT_DATE="$1"
YEAR="${INPUT_DATE:0:4}"   # First 4 characters (YYYY)
DAY="${INPUT_DATE:4:2}"    # Last 2 characters (DD)

# Remove leading zero from day if present
DAY_NO_LEADING_ZERO=$((10#$DAY))

# Construct the filename with .py extension
FILENAME="${INPUT_DATE}.py"

# Create the file
touch "$FILENAME"
if [ $? -ne 0 ]; then
    echo "Error: Unable to create file '$FILENAME'."
    exit 1
fi

echo "File '$FILENAME' created successfully."

# Custom header string (modify as needed)
HEADER="Cookie: session=<your session key here>"

# Construct the URL
URL="https://adventofcode.com/${YEAR}/day/${DAY_NO_LEADING_ZERO}/input"

INPUT_FILENAME="${INPUT_DATE}.txt"

# Call wget with the custom header and output to the created file
wget --header="$HEADER" "$URL" -O "$INPUT_FILENAME"
if [ $? -ne 0 ]; then
    echo "Error: wget command failed."
    exit 1
fi

echo "Content from '$URL' downloaded successfully to '$INPUT_FILENAME'."