Enhacements to scripts for developers

[wllacer]

two small enhacements to script execution.

1. Ability to be invoked directly without the need of using the -m archinstall . Also, in PyCharm and Kdevelop at least i managed to execute the scripts inside the IDE (a bit more tinkering is requiered 'cause the sudo)
   This is achieved playing with the python path:

if __name__ == '__main__':
	# to be able to execute simply as python examples/guided.py or (from inside examples python guided.py)
	# will work only with the copy at examples
	# this solution was taken from https://stackoverflow.com/questions/714063/importing-modules-from-parent-folder/33532002#33532002
	import sys
	current_path = os.path.abspath(getsourcefile(lambda: 0))
	current_dir = os.path.dirname(current_path)
	parent_dir = current_dir[:current_dir.rfind(os.path.sep)]
	sys.path.append(parent_dir)

2. Ability to get functions called extenally from other scripts:

Just separating code with has not to be executed if it is imported as a library inside this block[¹]

nomen = getsourcefile(lambda: 0)
script_name = nomen[nomen.rfind(os.path.sep) + 1:nomen.rfind('.')]
if __name__ in ('__main__',script_name):
    ....

In the other script the functions can be imported via [²]

from archinstall.examples.guided import perform_filesystem_operations, perform_installation

[¹]the two previous lines are to get the name of the script from the system (could have done from archinstall.arguments[script], but is more generic). That getsourcefile is from inspect -thus the weird syntax-
[²]As long as we keep the shadow copy between archinstall/examples and examples

[Torxed]

There's one minor issue with this change.
I'll come back and see what it can be, but these behave differently:

$ sudo python examples/guided.py`
Testing connectivity to the Arch Linux mirrors ...
Traceback (most recent call last):
  File "/home/anton/github/archinstall-wllacer/examples/guided.py", line 288, in <module>
    if not archinstall.arguments['offline']:
KeyError: 'offline'

vs

$ cp examples/guided.py ./
$ sudo python guided.py
# Works

[wllacer]

There's one minor issue with this change. I'll come back and see what it can be, but these behave differently:

$ sudo python examples/guided.py`
Testing connectivity to the Arch Linux mirrors ...
Traceback (most recent call last):
  File "/home/anton/github/archinstall-wllacer/examples/guided.py", line 288, in <module>
    if not archinstall.arguments['offline']:
KeyError: 'offline'

vs

$ cp examples/guided.py ./
$ sudo python guided.py
# Works

It works for me in both cases ( i've used the master after PR 1331). Pretty strange

[Torxed]

It might be something local on my end, I'll give it some more tries and see what it's about :)