Install Neovim with Powerline for all users

install-neovim-with-powerline.sh

#!/bin/bash
set -e
set -o pipefail

# -- Configuration ------------------------------------------------------------
readonly VIM_SYSTEM="/usr/share/nvim"
readonly NVIM_PLUG_DIR="/usr/local/share/nvim/plugged"
readonly NVIM_AUTOLOAD_DIR="$VIM_SYSTEM/site/autoload"
readonly NVIM_CONFIG_FILE="$VIM_SYSTEM/sysinit.vim"
readonly VIM_PLUG_URL="https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim"
readonly DEPENDENCIES=(neovim curl)

# -- Logging ------------------------------------------------------------------
log_info()    { echo -e "\e[94m${1}\e[39m"; }
log_success() { echo -e "\e[32m${1}\e[39m"; }
log_warning() { echo -e "\e[33m${1}\e[39m"; }
log_error()   { echo -e "\e[31m${1}\e[39m" >&2; }

# -- Dependency management ----------------------------------------------------

# Install a list of packages using the available system package manager
install_packages() {
    local packages=("$@")
    if command -v apt-get &>/dev/null; then
        sudo apt-get install -y "${packages[@]}"
    elif command -v dnf &>/dev/null; then
        sudo dnf install -y "${packages[@]}"
    elif command -v pacman &>/dev/null; then
        sudo pacman -S --noconfirm "${packages[@]}"
    else
        log_error "Unsupported package manager. Please install manually: ${packages[*]}"
        exit 1
    fi
}

# Check for missing dependencies and install them if needed
check_dependencies() {
    log_info "Checking dependencies..."
    local missing=()

    for dep in "${DEPENDENCIES[@]}"; do
        if ! command -v "$dep" &>/dev/null; then
            missing+=("$dep")
        fi
    done

    if [ ${#missing[@]} -gt 0 ]; then
        log_warning "Installing missing dependencies: ${missing[*]}"
        install_packages "${missing[@]}"
    else
        log_success "All dependencies are satisfied."
    fi
}

# -- Setup --------------------------------------------------------------------

# Create required system directories
create_directories() {
    log_info "Creating required directories..."
    sudo mkdir -p "$NVIM_PLUG_DIR"
    sudo mkdir -p "$NVIM_AUTOLOAD_DIR"
}

# Write the system-wide Neovim configuration file
write_config() {
    log_info "Writing system-wide Neovim config to $NVIM_CONFIG_FILE..."
    sudo tee "$NVIM_CONFIG_FILE" > /dev/null << 'EOF'
" Plug
call plug#begin('/usr/local/share/nvim/plugged')
Plug 'vim-airline/vim-airline'
Plug 'rakr/vim-one'
call plug#end()

" airline
let g:airline_powerline_fonts = 1

if (empty($TMUX))
  if (has("nvim"))
    let $NVIM_TUI_ENABLE_TRUE_COLOR=1
  endif
  if (has("termguicolors"))
    set termguicolors
  endif
endif

set background=dark
if isdirectory('/usr/local/share/nvim/plugged/vim-one')
    colorscheme one
endif

" others
set nu
set tabstop=4 shiftwidth=4 expandtab
EOF
}

# Download vim-plug into the system autoload directory
install_vim_plug() {
    log_info "Downloading vim-plug to $NVIM_AUTOLOAD_DIR/plug.vim..."
    sudo curl -fLo "$NVIM_AUTOLOAD_DIR/plug.vim" "$VIM_PLUG_URL"
}

# Install plugins headlessly using the system config
install_plugins() {
    log_info "Installing Neovim plugins..."
    nvim -u "$NVIM_CONFIG_FILE" --headless -c "PlugInstall --sync" -c "qa!"
}

# Set read permissions for all users on plugin and autoload directories
set_permissions() {
    log_info "Setting read permissions..."
    sudo chmod -R a+rX "$NVIM_PLUG_DIR"
    sudo chmod -R a+rX "$NVIM_AUTOLOAD_DIR"
}

# -- Main ---------------------------------------------------------------------
main() {
    echo "### INSTALL NEOVIM SYSTEM-WIDE CONFIG ###"

    check_dependencies
    create_directories
    write_config
    install_vim_plug
    install_plugins
    set_permissions

    log_success "Done! Config is now active for all users via $NVIM_CONFIG_FILE"
}

main