yamlfix squashes spaces in block strings

[wrouesnel]

Description

When files contain block strings, yamlfix will squash white space and change the string.

Current behavior

Given the file:

# original.yml
---
key: |
  # This is a value #
  #      X          #

yamlfix original.yml results in:

---
key: |-
  # This is a value  #
  #      X  #

Desired behavior

Strings in block quotes should remain semantically equivalent, or ideally not be modified at all. As it is, white space is removed.

Environment

------------------------------------------------------------------
     yamlfix: 1.9.0
     Python: 3.10.6
     Platform: Linux-5.15.0-27-generic-x86_64-with-glibc2.35
------------------------------------------------------------------

[lyz-code]

Hi @wrouesnel thank you for taking the time to open an issue. I can reproduce the issue and agree that it should be fixed. I can't guarantee that it will be fixed soon though :( so if you can, please make a PR :)

[wrouesnel]

PR opened. The issue was ultimately that regex, line-based parsing incorrectly identified # containing blocks as ending with comments, hence why the issue showed up the way it did.

I've implemented a solution based on running the file into the round-trip parser and modifying comment objects directly, which ensures only comments are ever altered.