copy flag implemented

[EugeneDar]

#434

[EugeneDar]

It's still a draft.

[EugeneDar]

At this point, running the c2eo -copy sourse.c target.eo command will copy the desired directory locally. I created a puzzle so that the directory is downloaded from the online repository (I may have to add just one more line).

[EugeneDar]

@yegor256 @Graur please have a look

[yegor256]

@EugeneDar no unit tests to cover this new functionality?

[EugeneDar]

@yegor256 I have no idea how to write tests, for the console command. Can you give an example of how to do this?

[yegor256]

@EugeneDar just like any other unit tests. The main() function is just a function. You can call it from your unit test providing it the list of strings as arguments. Then, you see what it returns and prints to console. See: https://stackoverflow.com/questions/4191089/how-to-unit-test-function-writing-to-stdout-stdcout

[EugeneDar]

@yegor256 previously added the --meta flag, so I would like to make tests in its likeness, since I am not familiar with the project. However, there are no such tests, and there are several directories with tests, so it is still not clear where to add unit tests for main. I also did not find main called in any of the tests.

[yegor256]

@EugeneDar to my knowledge, the repository has a few unit tests. Doesn't README explain where they are? If it doesn't, make a ticket about it.