Better shell completion support for packages (#44756)

lib/spack/spack/package.py

@@ -99,6 +99,7 @@
     install_dependency_symlinks,
     on_package_attributes,
 )
+from spack.package_completions import *
 from spack.spec import InvalidSpecDetected, Spec
 from spack.util.executable import *
 from spack.util.filesystem import file_command, fix_darwin_install_name, mime_type

lib/spack/spack/package_completions.py

@@ -0,0 +1,48 @@
+# Copyright 2013-2024 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from pathlib import Path
+from typing import Union
+
+"""Functions relating to shell autocompletion scripts for packages."""
+
+
+def bash_completion_path(root: Union[str, Path]) -> Path:
+    """
+    Return standard path for bash completion scripts under root.
+
+    Args:
+        root: The prefix root under which to generate the path.
+
+    Returns:
+        Standard path for bash completion scripts under root.
+    """
+    return Path(root) / "share" / "bash-completion" / "completions"
+
+
+def zsh_completion_path(root: Union[str, Path]) -> Path:
+    """
+    Return standard path for zsh completion scripts under root.
+
+    Args:
+        root: The prefix root under which to generate the path.
+
+    Returns:
+        Standard path for zsh completion scripts under root.
+    """
+    return Path(root) / "share" / "zsh" / "site-functions"
+
+
+def fish_completion_path(root: Union[str, Path]) -> Path:
+    """
+    Return standard path for fish completion scripts under root.
+
+    Args:
+        root: The prefix root under which to generate the path.
+
+    Returns:
+        Standard path for fish completion scripts under root.
+    """
+    return Path(root) / "share" / "fish" / "vendor_completions.d"