Update neovim script

update_neovim

#!/usr/bin/env bash

# vim: ft=sh
set -o errexit
set -o pipefail

pushd . >/dev/null

command -v git >/dev/null 2>&1 \
    || { echo "$0: git must be installed" >&2; exit 1; }

# Unset Lua environment to not interfere in the build process.
l_path="$LUA_PATH"
l_cpath="$LUA_CPATH"

restore_luapath () {
    [[ -z "$l_path" || -z "$l_cpath" ]] && return # no Lua to restore
    export LUA_PATH="$l_path"
    export LUA_CPATH="$l_cpath"
}

trap restore_luapath EXIT
unset LUA_PATH
unset LUA_CPATH

# Update repo
SRC_DIR="$HOME/src/neovim"
[[ -d "$SRC_DIR/.git" ]] \
    || { echo "$0: cannot find git repo ~/src/neovim, aborting" >&2; exit 1; }

echo "> Updating neovim repo in $SRC_DIR"
cd "$SRC_DIR"
git pull origin
git checkout master

# Clean up
echo "> Cleaning up old build artefacts ..."
make distclean

# Build dependencies
echo "> Building dependencies in $SRC_DIR/.deps ..."
make_tool="make"
cmake_generator="Unix Makefiles"
if command -v ninja >/dev/null 2>&1; then
    make_tool="ninja" # recommended
    cmake_generator="Ninja"
fi

mkdir -p "$SRC_DIR/.deps" && cd "$SRC_DIR/.deps"
cmake -G "$cmake_generator" "$SRC_DIR/third-party"
"$make_tool"

# Install
echo "> Building and installing neovim ..."
cd "$SRC_DIR"
make CMAKE_BUILD_TYPE=Release
sudo make install # default /usr/local

# Restore Lua environment
restore_luapath

popd

nvim_v="$(nvim --version)"
echo "> Sucessfully installed ${nvim_v%%$'\n'*}"