#508 Trailing space after `:` when unbreakable strings are wrapped

[Antony Saba]

When a value is a single, unbreakable string, a trailing space is added after the : before the newline.

#!/usr/bin/env python3

import sys
from ruamel.yaml import YAML

yaml = YAML()

doc = "---\nvalue:\n  verylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalue"
value = yaml.load(doc)
yaml.dump(value, sys.stdout)

doc = "---\nvalue: verylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalue"
value = yaml.load(doc)
yaml.dump(value, sys.stdout)

Using cat to show the extra spaces for both inputs:

> ./test.py | cat -e
value: $
  verylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalue$
value: $
  verylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalueverylongstringvalue$

SourceForge's formatting is messing with long lines and leading spaces, but the expected output would be to match one of the input doc strings above, since either one passes yamllint.

[Hauke]

I ran into a similar issue over at https://github.com/iterative/dvc/issues/10257#issuecomment-1915933299

A temporary fix is to set yaml.width to a larger number so that the line break is not happening, e.g.:

from ruamel.yaml import YAML
yaml = YAML()
yaml.widht = 10000
d = {'a':{'b':'veryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongpathorfilename.txt'}}
with open("file.yaml", "w") as f:
    yaml.dump(d, f)

The wrapping came into affect with ruamel-yaml version 0.17.22. Previous versions did not do this wrapping.

The issue might happen here with the addition of a whitespace before the linebreak is made.

[Johannes Postler]

I ran into another issue, where this seems to happen in flow sequences. In such a case, strings with quotation marks are wrapped into the next line and sometimes inserting a whitespace in the process.

I have an example at hand, if needed. Thanks to @Hauke for the hint at width.