chapel: use altinstall python@3.12

Formula/c/chapel.rb

@@ -1,10 +1,11 @@
 class Chapel < Formula
+ include Language::Python::Shebang
  desc "Programming language for productive parallel computing at scale"
  homepage "https://chapel-lang.org/"
  url "https://github.com/chapel-lang/chapel/releases/download/2.1.0/chapel-2.1.0.tar.gz"
  sha256 "72593c037505dd76e8b5989358b7580a3fdb213051a406adb26a487d26c68c60"
  license "Apache-2.0"
- revision 2
+ revision 3
  head "https://github.com/chapel-lang/chapel.git", branch: "main"
 
  bottle do
@@ -44,13 +45,20 @@ def install
  # It should be noted that this will expand to: 'for cmd in python3.12 python3 python python2; do'
  # in our find-python.sh script.
  inreplace "util/config/find-python.sh", /^(for cmd in )(python3 )/, "\\1#{python} \\2"
+ inreplace "third-party/chpl-venv/Makefile", "python3 -c ", "#{python} -c "
+
+ # a lot of scripts have a python3 or python shebang, which does not point to python3.12 anymore
+ Pathname.glob("**/*.py") do |pyfile|
+ rewrite_shebang detected_python_shebang, pyfile
+ end
 
  libexec.install Dir["*"]
  # Chapel uses this ENV to work out where to install.
  ENV["CHPL_HOME"] = libexec
  ENV["CHPL_GMP"] = "system"
  # This ENV avoids a problem where cmake cache is invalidated by subsequent make calls
  ENV["CHPL_CMAKE_USE_CC_CXX"] = "1"
+ ENV["CHPL_CMAKE_PYTHON"] = python
 
  # don't try to set CHPL_LLVM_GCC_PREFIX since the llvm
  # package should be configured to use a reasonable GCC