mybash/setup.sh

#!/bin/bash

RC='\e[0m'
RED='\e[31m'
YELLOW='\e[33m'
GREEN='\e[32m'

command_exists() {
    command -v "$1" >/dev/null 2>&1
}

checkEnv() {
    ## Check for requirements.
    REQUIREMENTS='curl groups sudo'
    for req in ${REQUIREMENTS}; do
        if ! command_exists ${req}; then
            echo -e "${RED}To run me, you need: ${REQUIREMENTS}${RC}"
            exit 1
        fi
    done

    ## Check Package Manager
    PACKAGEMANAGER='nala apt yum dnf pacman zypper'
    for pgm in ${PACKAGEMANAGER}; do
        if command_exists ${pgm}; then
            PACKAGER=${pgm}
            echo -e "Using ${pgm}"
            break
        fi
    done

    if [ -z "${PACKAGER}" ]; then
        echo -e "${RED}Can't find a supported package manager${RC}"
        exit 1
    fi

    ## Check if the current directory is writable.
    GITPATH="$(dirname "$(realpath "$0")")"
    if [[ ! -w ${GITPATH} ]]; then
        echo -e "${RED}Can't write to ${GITPATH}${RC}"
        exit 1
    fi

    ## Check SuperUser Group
    SUPERUSERGROUP='wheel sudo root'
    for sug in ${SUPERUSERGROUP}; do
        if groups | (command_exists rg && rg -q ${sug} || grep -q ${sug}); then
            SUGROUP=${sug}
            echo -e "Super user group ${SUGROUP}"
            break
        fi
    done

    ## Check if member of the sudo group.
    if ! groups | (command_exists rg && rg -q ${SUGROUP} || grep -q ${SUGROUP}); then
        echo -e "${RED}You need to be a member of the sudo group to run me!${RC}"
        exit 1
    fi
}

installDepend() {
    ## Check for dependencies.
    DEPENDENCIES='bash bash-completion tar bat tree multitail fastfetch'
    if ! command_exists nvim; then
        DEPENDENCIES="${DEPENDENCIES} neovim"
    fi

    echo -e "${YELLOW}Installing dependencies...${RC}"
    if [[ $PACKAGER == "pacman" ]]; then
        if ! command_exists yay && ! command_exists paru; then
            echo "Installing yay as AUR helper..."
            sudo ${PACKAGER} --noconfirm -S base-devel
            cd /opt && sudo git clone https://aur.archlinux.org/yay-git.git && sudo chown -R ${USER}:${USER} ./yay-git
            cd yay-git && makepkg --noconfirm -si
        else
            echo "AUR helper already installed"
        fi
        if command_exists yay; then
            AUR_HELPER="yay"
        elif command_exists paru; then
            AUR_HELPER="paru"
        else
            echo "No AUR helper found. Please install yay or paru."
            exit 1
        fi
        ${AUR_HELPER} --noconfirm -S ${DEPENDENCIES}
    elif [[ $PACKAGER == "nala" ]]; then
        sudo ${PACKAGER} install -y ${DEPENDENCIES}
    else
        sudo ${PACKAGER} install -yq ${DEPENDENCIES}
    fi
}

installStarship() {
    if command_exists starship; then
        echo "Starship already installed"
        return
    fi

    if ! curl -sS https://starship.rs/install.sh | sh; then
        echo -e "${RED}Something went wrong during starship install!${RC}"
        exit 1
    fi
    if command_exists fzf; then
        echo "Fzf already installed"
    else
        git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
        ~/.fzf/install
    fi
}

installZoxide() {
    if command_exists zoxide; then
        echo "Zoxide already installed"
        return
    fi

    if ! curl -sS https://raw.githubusercontent.com/ajeetdsouza/zoxide/main/install.sh | sh; then
        echo -e "${RED}Something went wrong during zoxide install!${RC}"
        exit 1
    fi
}

install_additional_dependencies() {
    sudo apt update
    sudo apt install -y trash-cli bat meld jpico
}

linkConfig() {
    ## Get the correct user home directory.
    USER_HOME=$(getent passwd ${SUDO_USER:-$USER} | cut -d: -f6)
    ## Check if a bashrc file is already there.
    OLD_BASHRC="${USER_HOME}/.bashrc"
    if [[ -e ${OLD_BASHRC} ]]; then
        echo -e "${YELLOW}Moving old bash config file to ${USER_HOME}/.bashrc.bak${RC}"
        if ! mv ${OLD_BASHRC} ${USER_HOME}/.bashrc.bak; then
            echo -e "${RED}Can't move the old bash config file!${RC}"
            exit 1
        fi
    fi

    echo -e "${YELLOW}Linking new bash config file...${RC}"
    ## Make symbolic link.
    ln -svf ${GITPATH}/.bashrc ${USER_HOME}/.bashrc
    ln -svf ${GITPATH}/starship.toml ${USER_HOME}/.config/starship.toml
}

checkEnv
installDepend
installStarship
installZoxide
install_additional_dependencies

if linkConfig; then
    echo -e "${GREEN}Done!\nRestart your shell to see the changes.${RC}"
else
    echo -e "${RED}Something went wrong!${RC}"
fi