Vimscript implementation

[dantleech]

Hey :)

This PR:

• Adjusts the plugin to use only Vimscript, taking advantage of the --errorFormat=raw option.
• Tries to detect project versions of PHPStan, falling back to the global executable.

Todo:

• Add some documentation.
• Test it properly
• Include phpstan.neon if it exists...

Initially this plugin didn't work because I didn't have phpstan installed globally, then I just thought I'd try and adopt the VIMScript approach.

[akrabat]

This worked for me as I have PHPStan installed in vendor/bin/phpstan

Thanks!

[mstyles]

This sounds like a great addition, as I also have PHPStan installed at the project level. Any reason why this hasn't been merged?

[dantleech]

For what it's worth, I switched to using Ale which supports Phpstan OOTB: https://github.com/w0rp/ale (works best with phpstan installed globally)

[weeman1337]

For what it's worth, I switched to using Ale which supports Phpstan OOTB: https://github.com/w0rp/ale (works best with phpstan installed globally)

• Since three days ALE now picks up the local PHPStan executable if it is available
• ALE only supports file level diagnostics while this one here loads everything into the quickfix list

This combination of both would be great :D