update-version-symlinks

#! /usr/bin/env bash
#
# Run this script to update local symlinks after changing the tree-sitter
# version in the file 'tree-sitter-version'.
#
# This facilitates development that requires switching between different
# tree-sitter versions. The compiled tree-sitter libraries and binaries
# go into a versioned folder e.g. tree-sitter-0.22.6 and are therefore
# preserved when switching back and forth between versions. 
#
# If the user wishes to install the tree-sitter CLI or runtime library
# elsewhere than the default 'tree-sitter/', they can do so by passing the
# '--prefix' option. In this case, the symlinks we create here become
# irrelevant.
#
set -eu

if [[ ! -e tree-sitter-version ]]; then
  cp tree-sitter-version.default tree-sitter-version
fi
version=$(cat tree-sitter-version)

echo "Updating symlinks 'downloads/tree-sitter' and 'tree-sitter'"
mkdir -p downloads

(
  cd downloads
  rm -f tree-sitter
  ln -s tree-sitter-"$version" tree-sitter
)

if [[ -d tree-sitter ]] && [[ ! -L tree-sitter ]]; then
  # The issue is that we want to be able to use two different versions of
  # the tree-sitter CLI. To make this convenient, the 'tree-sitter' folder
  # is now a symlink to the versioned folder name.
  echo "*** Your tree-sitter installation is old. Removing it."
  rm -rf tree-sitter
fi

# Remove the symlink and set it to the new install folder.
# It allows us to use this script to switch tree-sitter versions without
# rebuilding everything.
rm -f tree-sitter
ln -s tree-sitter-"$version" tree-sitter
mkdir -p tree-sitter-"$version"