User-friendly error message for missing main function

[littlewhitecloud]

fix #210

• An error that says clearly there is no main function, if the file you try to run doesn't define a main function.
• An error if you try to import a file that defines a main function.

[littlewhitecloud]

@Akuli
This pr will make tests\should_succeed\import_cycle.jou fail
So I moved it from should_succeed to other_errors

[Akuli]

@littlewhitecloud Sorry that it took so long for me to start working on this :)

I am now quite happy with how it works. C code is reasonably clean, error messages are good, existing and new tests are passing.

But I haven't updated the self-hosted compiler. Can you do that? :)

[littlewhitecloud]

@littlewhitecloud Sorry that it took so long for me to start working on this :)

I am now quite happy with how it works. C code is reasonably clean, error messages are good, existing and new tests are passing.

But I haven't updated the self-hosted compiler. Can you do that? :)

I need some time to know what changed :) But now I'm a little busy and I will be back to school soon XD
So I am not sure if I can update the self-hosted compiler, Sorry.

[littlewhitecloud]

Ok I just got time but is there find_file function in self-hosted compiler?

[Akuli]

This loop in main.jou is basically the find_file function. It is not in a separate function, so you can either copy/paste the loop, or make a new function (or method) that does it.

            found = False
            for i = 0; i < self->nfiles; i++:
                if strcmp(self->files[i].ast.path, item.path) == 0:
                    found = True
                    break

[littlewhitecloud]

What's the return type @Akuli ?

def find_file(files: FileState*, nfiles: int, path: byte*) -> ?:
    for i = 0; i < nfiles; i++:
        if strcmp(files[i].ast.path, path) == 0:
            return files[i]
    return NULL

[Akuli]

I have added a few review comments. Let me know if you need more help :)

[littlewhitecloud]

I have added a few review comments. Let me know if you need more help :)

Thanks!

[Akuli]

Looks good, thanks!