nvim_install.sh

#!/usr/bin/env bash

set -e
set -u
set -o pipefail
set -C

ARCH=$(uname -m)
LOCAL_DIR=/usr/local
DOWNLOAD_URL="https://github.com/neovim/neovim/releases/download/nightly/nvim-linux-${ARCH}.tar.gz"
EXPANDED_DIR=$(basename $DOWNLOAD_URL | sed -e 's/.tar.gz$//')
INSTALL_DIR="${LOCAL_DIR}/${EXPANDED_DIR}"
INSTALL_PATH="${LOCAL_DIR}/bin/nvim"


_is_root() {
    if [[ $(id -u) -eq 0 ]]; then
        return 0
    else
        return 1
    fi
}

_execute() {
    local BASH=$(which bash)
    if ! _is_root; then
        BASH="sudo $BASH"
    fi
    $BASH -c "$@"
}

install() {

    if [[ -d $INSTALL_DIR ]]; then
        echo "$INSTALL_DIR is already exists."
        exit 1
    fi
    _execute "curl -sfL $DOWNLOAD_URL | tar -C $LOCAL_DIR -pxvzf -; (cd "${LOCAL_DIR}/bin"; ln -sf "../${EXPANDED_DIR}/bin/nvim" nvim)"
}

forceinstall() {

    uninstall
    echo "nvim force install."
    echo ""
    install
}

uninstall() {

    if [[ ! -d $INSTALL_DIR ]]; then
        echo "$INSTALL_DIR is not exists."
        exit 1
    fi
    _execute "rm -frv $INSTALL_DIR $INSTALL_PATH"
}

usage() {
    echo "Usage: $0 [install|forceinstall|uninstall]"
    exit 1
}

if [ $# -ne 1 ]; then
    usage
fi


COMMAND=$1
case "$COMMAND" in
  "install" ) install ;;
  "forceinstall" ) forceinstall ;;
  "uninstall" ) uninstall ;;
  * )  usage;;
esac