`bundle` command converts multiline strings from literal mode to folded mode

[Boiarshinov]

Describe the bug As the openapi documentation says: there is two modes for multiline strings in yaml:

• Literal mode - Line breaks in the source YAML file are preserved in the output
• Folded mode - Line breaks are removed so the output is a single string. Use an empty line to force a line break.

Literal mode starts with pipe symbol '|':

description: |
  first line
  second line

Folded mode starts with symbol '>':

description: >
  first line.
  also first line

  second line

BUG: bundle command converts multiline strings from literal mode to folded mode in some cases. I had done some experiments and found out that conversion to folded mode happen when any line of the multiline string have length more than (>) 80 symbols (indent spaces included).

To Reproduce Given OpenAPI file

openapi: 3.0.1
info:
  title: Demo API
  version: '1.0'
tags:
  - name: WithShortDescription
    description: |
      first line is not long
      second line exists
  - name: WithLongDescription
    description: |
      first line loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong
      second line exists
paths: {}

Run bundle command:

openapi bundle openapi.yaml --output bundled.yaml

Open the bundled result and see:

openapi: 3.0.1
info:
  title: Demo API
  version: '1.0'
tags:
  - name: WithShortDescription
    description: |
      first line is not long
      second line exists
  - name: WithLongDescription
    description: >
      first line
      loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong

      second line exists
paths: {}
components: {}

As you can see second tag description was converted to folded mode

Expected behavior In my opinion expected behavior is to save multiline string mode from initial file. So the result of bundle command should be:

openapi: 3.0.1
info:
  title: Demo API
  version: '1.0'
tags:
  - name: WithShortDescription
    description: |
      first line is not long
      second line exists
  - name: WithLongDescription
    description: |
      first line loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong
      second line exists
paths: {}
components: {}

openapi-cli Version(s) 1.0.0-beta.74

Node.js Version(s) v16.13.0

[Boiarshinov]

I think that the roots of this bug is a default maximum size of the line in a description field. I tried to search source code with value 80, but found nothing related.

Is there any possible way to turn off lines formatting by maximum size? Or may be way to set maximum size of the line to some big integer value?