How to tell vscode-yaml to use specific schema with a yaml document?

[ssbarnea]

I am the maintainer of the vscode-ansible extension, which depends on vscode-yaml and aims to help it correctly identify different Ansible related file types (there are at least 4-5 different schemas involved).

One major issue is that the the glob patterns provided by vscode are quite limited and in order to determine if a specific YAML should use one Ansible schema or another is a more complex process which required a bit of heuristics.

I do need some help on how can programately read and change the JSON schema of a specific YAML file from within the ansible extension, mainly helping YAML extension to use the correct schema. I do also hope that the picked schema is persistent.

Please note that altering YAML file and injecting the schema comment in file, is not a viable alternative, for multiple reasons:

• unscalable: Ansible repositories do often have hundreds if not thousands of files
• schemas are versioned and nobody expect to hardcode it inside each file
• Ansible main schemas are dynamic, being dependent on each Ansible installation environment, likely that we will endup generating a local schema for each repo and cache it instead of downloading one.

I hope that this approach would make the maintenance and development easier as users will be less likely to raise bug against YAML extension about problems that are of broken-schema nature, or something else unrelated to YAML extension.

[evidolob]

@ssbarnea You can start looking from schema-extension-api
Thous API allows to contribute and change JSON schema on the fly.