Port test.sh to platform independent D.

[veelo]

This executes also way faster by not spawning GNU diff (at least on Windows).

[veelo]

This script simply ignores differences in line ending, unless --end_of_line is one of the arguments to dfmt.

[veelo]

I am keeping this in draft for the moment because on Windows dfmt seems to generate LF line endings by default, which is unexpected. If that is indeed the case, this script should probably not ignore line endings like is does now.

[veelo]

I had it backwards yesterday night: the script should be correct in it's current state for the current dfmt behaviour. Once #552 is addressed, the script can be simplified to always compare line endings.

I intentionally did not touch test.sh, as devs on Posix might want to test both versions for a while to make sure I didn't miss anything.

This should be ready for review now.

[maxhaton]

Seems OK to me.

[WebFreak001]

I think it might make sense to force an --end_of_line parameter to all dfmt calls, so all files are always tested with the platform native EOL string (if not changed to anything else)

[veelo]

I think it might make sense to force an --end_of_line parameter to all dfmt calls, so all files are always tested with the platform native EOL string (if not changed to anything else)

That will make tests fail for anyone that has configured Git to check out files with line endings that differ from what is native to the platform (apparently, such people exist).

I think the suggestion made in #552 is better, because then tests are run in the same manner on every platform:

The most versatile solution would probably be to inspect the first n lines of input and see what the dominating line endings are there, and use that as default for the entire output.

EDIT: well, not "in the same manner", that will depend on Git settings, but I mean the script will not special-case the platform if dfmt keeps the same line endings between input and output.

[veelo]

Can we get this merged please? I have a PR for #552 ready that assumes this.

[veelo]

Thanks, that was quick!