setup.sh

#!/bin/bash

# installs the repo to ~/.dotfiles and then runs script/bootstrap
# Credit: https://github.com/alrra/dotfiles/


declare -r GITHUB_REPOSITORY="atecle/dotfiles"

declare -r DOTFILES_ORIGIN="git@github.com:$GITHUB_REPOSITORY.git"
declare -r DOTFILES_TARBALL_URL="https://github.com/$GITHUB_REPOSITORY/tarball/master"
declare -r DOTFILES_UTILS_URL="https://raw.githubusercontent.com/$GITHUB_REPOSITORY/master/utils.sh"

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

declare dotfilesDirectory="$HOME/.dotfiles"
declare skipQuestions=false

# ----------------------------------------------------------------------
# | Helper Functions                                                   |
# ----------------------------------------------------------------------

download() {

    local url="$1"
    local output="$2"

    if command -v "curl" &> /dev/null; then
        curl -LsSo "$output" "$url" &> /dev/null
        #     │││└─ write output to file
        #     ││└─ show error messages
        #     │└─ don't show the progress meter
        #     └─ follow redirects

        return $?

    elif command -v "wget" &> /dev/null; then

        wget -qO "$output" "$url" &> /dev/null
        #     │└─ write output to file
        #     └─ don't show output

        return $?
    fi

    return 1

}

download_dotfiles() {

    local tmpFile=""

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    print_in_purple "\n • Download and extract archive\n\n"

    tmpFile="$(mktemp /tmp/XXXXX)"

    download "$DOTFILES_TARBALL_URL" "$tmpFile"
    print_result $? "Download archive" "true"
    printf "\n"

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    if ! $skipQuestions; then

        ask_for_confirmation "Do you want to store the dotfiles in '$dotfilesDirectory'?"

        if ! answer_is_yes; then
            dotfilesDirectory=""
            while [ -z "$dotfilesDirectory" ]; do
                ask "Please specify another location for the dotfiles (path): "
                dotfilesDirectory="$(get_answer)"
            done
        fi

        # Ensure the `dotfiles` directory is available

        while [ -e "$dotfilesDirectory" ]; do
            ask_for_confirmation "'$dotfilesDirectory' already exists, do you want to overwrite it?"
            if answer_is_yes; then
                rm -rf "$dotfilesDirectory"
                break
            else
                dotfilesDirectory=""
                while [ -z "$dotfilesDirectory" ]; do
                    ask "Please specify another location for the dotfiles (path): "
                    dotfilesDirectory="$(get_answer)"
                done
            fi
        done

        printf "\n"

    else

        rm -rf "$dotfilesDirectory" &> /dev/null

    fi

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

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    # Extract archive in the `dotfiles` directory.

    extract "$tmpFile" "$dotfilesDirectory"
    print_result $? "Extract archive" "true"

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    cd "$dotfilesDirectory/" \
        || return 1

}

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 -zxf "$archive" --strip-components 1 -C "$outputDir"
        return $?
    fi

    return 1

}

verify_os() {

    declare -r MINIMUM_MACOS_VERSION="10.10"
    declare -r MINIMUM_UBUNTU_VERSION="14.04"

    local os_name=""
    local os_version=""

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    # Check if the OS is `macOS` and
    # it's above the required version.

    os_name="$(uname -s)"

    if [ "$os_name" == "Darwin" ]; then

        os_version="$(sw_vers -productVersion)"

        if is_supported_version "$os_version" "$MINIMUM_MACOS_VERSION"; then
            return 0
        else
            printf "Sorry, this script is intended only for macOS %s+" "$MINIMUM_MACOS_VERSION"
        fi

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    # Check if the OS is `Ubuntu` and
    # it's above the required version.

    elif [ "$os_name" == "Linux" ] && [ -e "/etc/lsb-release" ]; then

        os_version="$(lsb_release -d | cut -f2 | cut -d' ' -f2)"

        if is_supported_version "$os_version" "$MINIMUM_UBUNTU_VERSION"; then
            return 0
        else
            printf "Sorry, this script is intended only for Ubuntu %s+" "$MINIMUM_UBUNTU_VERSION"
        fi

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    else
        printf "Sorry, this script is intended only for macOS and Ubuntu!"
    fi

    return 1

}

# ----------------------------------------------------------------------
# | Main                                                               |
# ----------------------------------------------------------------------

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

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    # Ensure the OS is supported and
    # it's above the required version.

    verify_os \
        || exit 1

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    skip_questions "$@" \
        && skipQuestions=true

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    ask_for_sudo

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    # 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

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    script/bootstrap

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    if ! $skipQuestions; then
        . "restart.sh" || exit 1
    fi

}

main "$@"