Support for relative paths in editorUrl

[Wirone]

This allows running PHPStan within Docker environment and output errors with links to files on the host (editorUrl must be configured using actual host's path to the project + %rel_file%).

Fixes phpstan/phpstan#7043

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I decided to use %rel_file% because there was RelativePathHelper already in the formatter, so it was almost non-invasive. Other options would require much more work and many other files modified.

I wanted to add test for it, but honestly I don't know how to do it 🤔 I created test similar to TableErrorFormatterTest::testEditorUrlWithTrait() but flow of outputting errors does not allow to check if href added to message is correct - it's missing in the output retrieved with $this->getOutputContent(). Anyway, I was able to test it with Docker runtime created locally and it works:

# phpstan.neon
includes:
	- phpstan.neon.dist

parameters:
	editorUrl: 'phpstorm://open?file=/Volumes/Projects/~Github/phpstan/phpstan-src/%%rel_file%%&line=%%line%%'

Screenshot shows PHPStan analysis within Docker container, at the bottom you can see tooltip with href that is shown when mouse cursor is over the activated link - it's proper host's path, not container's one (which is /etc/phpstan/...).

FYI: ~/Dev is a symlink to /Volumes/Projects/, if CLI prompt looks suspicious 😉

[ondrejmirtes]

1. Needs a test
2. It's not going to work with the default relativePathHelper configured for TableErrorFormatter (FuzzyRelativePathHelper). It has more complex logic which doesn't always result in relative path starting at CWD. You need to inject simpleRelativePathHelper there as a 2nd one and use that.
3. I don't like rel_file, all names are camelCaps now.

[Wirone]

@ondrejmirtes how would you like to test it? Because when I debug it:

I see that there's no <href> in the output, so I don't know how to test if relative path was used for generating link 🤔 Is it trimmed somewhere in between?

EDIT: Decorated output stream did the trick 🙂

[ondrejmirtes]

Thank you very much! I finally got it and it's nice!