download.sh

#!/bin/bash

download() {
    input=$1
    final_output_file=$2

    # Check if the input contains a range pattern
    if [[ $input =~ \[([0-9]+)-([0-9]+)\] ]]; then
        # Extract the base URL and the range
        base_url="${input%%_part*}"
        start_part=${BASH_REMATCH[1]}
        end_part=${BASH_REMATCH[2]}
        
        # Remove any existing final output file to avoid appending to old data
        rm -f "$final_output_file"

        # Loop through the range and download each part, appending to the final file
        for i in $(seq $start_part $end_part); do
            part_url="${base_url}_part${i}"
            echo "Download file $part_url and appending to $final_output_file..."
            curl -s -L "$part_url" -o - >> "$final_output_file"
            if [[ $? -ne 0 ]]; then
                echo "Error downloading $part_url. Exiting."
                return 1
            fi
        done
        echo "Download completed and concatenated into $final_output_file."
    else
        # Direct download
        url=$input
        echo "Download $url to $final_output_file..."
        curl -s -L -o "$final_output_file" "$url"
        if [[ $? -ne 0 ]]; then
            echo "Error downloading $url. Exiting."
            return 1
        fi
        echo "Download completed: $final_output_file."
    fi
}

# Example usage
download "https://github.com/gbraad-apps/personal-libreoffice/releases/download/latest/disk.qcow2_part[0-1]" "libreoffice.qcow2"
download "https://github.com/gbraad-apps/personal-obsidian/releases/download/latest/disk.qcow2" "obsidian.qcow2"