CLI arguments (sys.argv parsing)

[danilobellini]

Today, dose.py has a GUI configuration as well as a CLI command-line approach that allows a fast call like dose tox -v or dose "cat my_code.lang | my_interpreter.sh" and many things alike. However, parameters like the -v in that example are for the given command, not for dose, i.e., that means dose "tox -v".

A solution for giving CLI arguments for dose.py would be allowing them to happen BEFORE the command, which would be known based on the char "-" and from the context, e.g. dose.py --config dose.conf tox -v would mean:

• Call dose.py directly and auto-start (because a command is given)
• The call command is tox -v
• Configuration file is dose.conf (where $HOME/.dose.conf would still be a fallback for "defaults" not explicitly written in the given alternative, though it should be kept unchanged).

This issue is to add the first CLI arguments for dose.py, allowing:

• -h or --help for help
• --config=CONFIG for setting up a specific configuration file (or directory, meaning a .dose.conf should be created there)
• --size=SIZE for setting a initial window size like 200x200 (fractals CLI would help)
• --position=POSITION, parsed like the size
• --opacity=OPACITY, a value from 0 (transparent) to 255 (opaque)
• --flip and --noflip to ensure whether image flipping should be done

So the configuration should have the following priority levels (for reading):

1. CLI arguments
2. Local config file, passed as --config or as a ./.dose.conf file
3. User config file $HOME/.dose.conf
4. Global defaults as "hardcoded" in dose.py