3 files changed, 66 insertions, 0 deletions
diff --git a/archinstall/lib/utils/__init__.py b/archinstall/lib/utils/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/archinstall/lib/utils/__init__.py
diff --git a/archinstall/lib/utils/singleton.py b/archinstall/lib/utils/singleton.py
new file mode 100644
index 00000000..55be70eb
--- /dev/null
+++ b/archinstall/lib/utils/singleton.py
@@ -0,0 +1,15 @@
+from typing import Dict, Any
+
+
+class _Singleton(type):
+	""" A metaclass that creates a Singleton base class when called. """
+	_instances: Dict[Any, Any] = {}
+
+	def __call__(cls, *args, **kwargs):
+		if cls not in cls._instances:
+			cls._instances[cls] = super().__call__(*args, **kwargs)
+		return cls._instances[cls]
+
+
+class Singleton(_Singleton('SingletonMeta', (object,), {})):  # type: ignore
+	pass
diff --git a/archinstall/lib/utils/util.py b/archinstall/lib/utils/util.py
new file mode 100644
index 00000000..2e42b3cf
--- /dev/null
+++ b/archinstall/lib/utils/util.py
@@ -0,0 +1,51 @@
+from pathlib import Path
+from typing import Any, TYPE_CHECKING, Optional, List
+
+from ..output import FormattedOutput
+from ..output import info
+
+if TYPE_CHECKING:
+	_: Any
+
+
+def prompt_dir(text: str, header: Optional[str] = None) -> Path:
+	if header:
+		print(header)
+
+	while True:
+		path = input(text).strip(' ')
+		dest_path = Path(path)
+		if dest_path.exists() and dest_path.is_dir():
+			return dest_path
+		info(_('Not a valid directory: {}').format(dest_path))
+
+
+def is_subpath(first: Path, second: Path):
+	"""
+	Check if _first_ a subpath of _second_
+	"""
+	try:
+		first.relative_to(second)
+		return True
+	except ValueError:
+		return False
+
+
+def format_cols(items: List[str], header: Optional[str] = None) -> str:
+	if header:
+		text = f'{header}:\n'
+	else:
+		text = ''
+
+	nr_items = len(items)
+	if nr_items <= 4:
+		col = 1
+	elif nr_items <= 8:
+		col = 2
+	elif nr_items <= 12:
+		col = 3
+	else:
+		col = 4
+
+	text += FormattedOutput.as_columns(items, col)
+	return text