install-nvim.sh

#!/bin/sh

# This will install nightly Neovim on Linux.
# You do not need to run this as root, nor should you.

# I thought users intersted in this vim plugin
# might also be interested in an install script
# because a locked-down server is a common reason
# people might still be forced to use regular Vim.

# This extracts the image,
# instead of mounting it, as that might not be allowed on servers.

set -eu

has() { command -v "$@" >/dev/null 2>&1; }
die() { echo "ERROR: $*"; exit 1; }
download() {
  mkdir -p "$(dirname "$2")"
  if has curl; then
    curl -Lf "$1" -o "$2" -z "$2"
  elif has get; then
    wget "$1" -O "$2"
  else
    die "curl or wget required"
  fi
}

[ "$(id -u)" != "0" ] || die "Do not run as root"
[ "$(uname -s)" = "Linux" ] || die "Not Linux"

nvim="$HOME/.local/bin/nvim"
image="$HOME/.local/nvim/AppImage"
nvimurl="https://github.com/neovim/neovim/releases/download/nightly/nvim.appimage"

main() {
  download "$nvimurl" "$image"
  chmod    u+x        "$image"

  "$image" --appimage-extract ~/.local/nvim
  ln -sfn ~/.local/nvim/squashfs-root/AppRun "$nvim"
}

main "$@"