setup.sh

#!/bin/bash

#==================================
# Variables
#==================================
declare GITHUB_REPOSITORY="excalith/.dotfiles"
declare DOTFILES_ORIGIN="git@github.com:$GITHUB_REPOSITORY.git"
declare DOTFILES_TARBALL_URL="https://github.com/$GITHUB_REPOSITORY/tarball/main"
declare DOTFILES_UTILS_URL="https://raw.githubusercontent.com/$GITHUB_REPOSITORY/main/scripts/utils/utils.sh"

#==================================
# Settings
#==================================
declare DOTFILES_DIR="$HOME/.dotfiles"
declare MINIMUM_MACOS_VERSION="12.0"
declare MINIMUM_UBUNTU_VERSION="20.04"

#==================================
# Helper Functions
#==================================
download() {
    local url="$1"
    local output="$2"

    if command -v "curl" &> /dev/null; then
        curl \
            --location \
            --silent \
            --show-error \
            --output "$output" \
            "$url" \
                &> /dev/null

        return $?

    elif command -v "wget" &> /dev/null; then
        wget \
            --quiet \
            --output-document="$output" \
            "$url" \
                &> /dev/null

        return $?
    fi

    return 1
}

download_dotfiles() {
    local tmpFile=""

    print_title "Download and extract archive"
    tmpFile="$(mktemp /tmp/XXXXX)"

    download "$DOTFILES_TARBALL_URL" "$tmpFile"
    print_result $? "Download archive" "true"

    mkdir -p "$DOTFILES_DIR"
    print_result $? "Create '$DOTFILES_DIR'" "true"

    # Extract archive in the `dotfiles` directory.
    extract "$tmpFile" "$DOTFILES_DIR"
    print_result $? "Extract archive" "true"

    rm -rf "$tmpFile"
    print_result $? "Remove archive"
}

download_utils() {
    local tmpFile=""

    tmpFile="$(mktemp /tmp/XXXXX)"
    download "$DOTFILES_UTILS_URL" "$tmpFile" \
        && . "$tmpFile" \
        && rm -rf "$tmpFile" \
        && return 0

   return 1

}

extract() {
    local archive="$1"
    local outputDir="$2"

    if command -v "tar" &> /dev/null; then
        tar \
            --extract \
            --gzip \
            --file "$archive" \
            --strip-components 1 \
            --directory "$outputDir"

        return $?
    fi

    return 1
}

verify_os() {
    local os_name="$(get_os)"
    local os_version="$(get_os_version)"

    # Check if the OS is `macOS` and supported
    if [ "$os_name" == "macos" ]; then
        if is_supported_version "$os_version" "$MINIMUM_MACOS_VERSION"; then
            print_success "$os_name $os_version is supported"
            return 0
        else
            print_error "Minimum MacOS $MINIMUM_MACOS_VERSION is required (current is $os_version)"
        fi

    # Check if the OS is `Ubuntu` and supported
    elif [ "$os_name" == "ubuntu" ]; then

        if is_supported_version "$os_version" "$MINIMUM_UBUNTU_VERSION"; then
            print_success "$os_name $os_version is supported"
            return 0
        else
            print_error "Minimum Ubuntu $MINIMUM_UBUNTU_VERSION is required (current is $os_version)"
        fi

    # Check if the OS is `Windows WSL` and supported
    elif [ "$os_name" == "wsl_ubuntu" ]; then
            print_success "Windows WSL on Ubuntu is supported"
            return 0
    
    # Check if the OS is `Arch` and supported
    elif [ "$os_name" == "arch" ]; then
        print_success "$os_name is supported"
        return 0

    # Check if the OS is `Alpine` and supported
    elif [ "$os_name" == "alpine" ]; then
        print_success "$os_name is supported"
        return 0

    # Exit if not supported OS
    else
        print_error "$os_name is not supported. This dotfiles are intended for MacOS, Ubuntu and Arch"
    fi

    return 1
}

#==================================
# Main Install Starter
#==================================
main() {

    # Ensure that the following actions are made relative to this file's path.
    cd "$(dirname "${BASH_SOURCE[0]}")" || exit 1

    # Load utils
    if [ -x "utils.sh" ]; then
        . "utils.sh" || exit 1
    else
        download_utils || exit 1
    fi

    print_section "Excalith Dotfiles Setup"

    # Ask user for sudo
    print_title "Sudo Access"
    ask_for_sudo

    # Verify OS and OS version
    print_title "Verifying OS"
    verify_os || exit 1

    # Check if this script was run directly (./<path>/setup.sh),
    # and if not, it most likely means that the dotfiles were not
    # yet set up, and they will need to be downloaded.
    printf "%s" "${BASH_SOURCE[0]}" | grep "setup.sh" &> /dev/null \
        || download_dotfiles

    # Start installation
    . "$HOME/.dotfiles/system/$(get_os)/install.sh"

    # Ask for git credentials
    . "$HOME/.dotfiles/scripts/utils/generate_git_creds.sh"

    # Ask for SSH (Disabled since I started using another method)
    #. "$HOME/.dotfiles/scripts/utils/generate_ssh.sh"

    # Ask for GPG (Disabled since I started using another method)
    #. "$HOME/.dotfiles/scripts/utils/generate_gpg.sh"

    # Link to original repository and update contents of dotfiles
    if [ "$(git config --get remote.origin.url)" != "$DOTFILES_ORIGIN" ]; then
        . "$HOME/.dotfiles/scripts/utils/init_dotfile_repo.sh '$DOTFILES_ORIGIN'"
    fi

    # Ask for restart
    . "$HOME/.dotfiles/scripts/utils/restart.sh"
}

main "$@"