Added profile `desktop.py` which helps users select a desktop environment. Also added `archinstall.generic_select` to help with selecting generic things from a list of options.

archinstall/lib/user_interaction.py

@@ -5,6 +5,34 @@ from .locale_helpers import search_keyboard_layout
 ## TODO: Some inconsistencies between the selection processes.
 ##       Some return the keys from the options, some the values?
 
+def generic_select(options, input_text="Select one of the above by index or absolute value: ", sort=True):
+	"""
+	A generic select function that does not output anything
+	other than the options and their indexs. As an example:
+
+	generic_select(["first", "second", "third option"])
+	1: first
+	2: second
+	3: third option
+	"""
+
+	if type(options) == dict: options = list(options)
+	if sort: options = sorted(list(options))
+	if len(options) <= 0: raise RequirementError('generic_select() requires at least one option to operate.')
+
+	for index, option in enumerate(options):
+		print(f"{index}: {option}")
+
+	selected_option = input(input_text)
+	if selected_option.isdigit():
+		selected_option = dict_o_disks[int(selected_option)-1]
+	elif selected_option in dict_o_disks:
+		pass # We gave a correct absolute value
+	else:
+		raise RequirementError(f'Selected option "{selected_option}" does not exist in available options: {options}')
+	
+	return selected_option
+
 def select_disk(dict_o_disks):
 	"""
 	Asks the user to select a harddrive from the `dict_o_disks` selection.

profiles/dekstop.py

@@ -0,0 +1,32 @@
+# A desktop environment selector.
+
+import archinstall, os
+
+def _prep_function(*args, **kwargs):
+	"""
+	Magic function called by the importing installer
+	before continuing any further. It also avoids executing any
+	other code in this stage. So it's a safe way to ask the user
+	for more input before any other installer steps start.
+	"""
+
+	supported_desktops = ['gnome', 'kde', 'awesome']
+	dektop = archinstall.generic_select(supported_desktops, 'Select your desired desktop environemtn: ')
+
+	profile = archinstall.Profile(None, dektop)
+	# Loading the instructions with a custom namespace, ensures that a __name__ comparison is never triggered.
+	with profile.load_instructions(namespace=f"{dektop}.py") as imported:
+		if hasattr(imported, '_prep_function'):
+			return imported._prep_function()
+		else:
+			print(f"Deprecated (??): {dektop} profile has no _prep_function() anymore")
+
+if __name__ == 'desktop':
+	print('The desktop.py profile should never be executed as a stand-alone.')
+
+	"""
+	This "profile" is a meta-profile.
+	It will not return itself, there for this __name__ will never
+	be executed. Instead, whatever profile was selected will have
+	it's handle returned and that __name__ will be executed later on.
+	"""