LSP server to autocomplete Helm files.

The Helm files are parsed as YAML files. The trick is that the Helm files are "redacted", i.e. all the {{...}} template placeholders are substituted with # comment characters, so most of the time YAML tree-sitter parser can figure proper hints.

I used YAML examples from ContainerSolutions and helm templates from helm/examples. A good playground to view tree-sitter output is on ast-grep.

When a file is opened, LSP can run an external initialization script. The script can, for example, download helm charts with helm dependencies update or helmfile fetch --output-dir charts/

[lazyvim][https://www.lazyvim.org/]

Definitions are taken from Kubernetes API. For sake of testing, in the repo we have only selected keys (the original from cluster can be much larger).

kubectl proxy
curl http://localhost:8001/openapi/v2 | python3 testdata/filter_kubernetes_api_schema.py > filtered_v2.json

• Show YAML parse errors (e.g. when there is a missing colon after a key) - It seems that tree-sitter for YAML marks the whole top node as erroneous.

Prerequisite is to have charts/ loaded with

helm dependencies update

1. Copy the configuration to ~/.config/nvim/lua/plugins/lsp-yaml.lua
2. cargo build

To make Helm autocomplete work, you need to deliver OpenAPI V2 definitions for your cluster resources, see below.

LazyVim/LazyVim#2263

• Autocomplete for top-level props (when there is no "path to property").
  • Go to charts/ directory
  • Parse Charts.yaml
    • Parse name from Charts.yaml
    • Later, parse dependencies.
  • Parse tgz
    • Find the chart with "name"
    • Load all the values files
    • Parse all the values files
  • On edit, find all the matching values and display hints.
• Fix "redacting" by being more smart on what is replaced with what. e.g. values with placeholder, if-else blocks with spaces.
• BUG: Helm autocomplete does not work for top level fields.
• Autocomplete for all the values_... files.
• Have some reasonable installation script that bootstraps the schema.
• Underline error for API version and Kind, if not in the schema.
• Handle hemlfile.yaml and its dir structure: helmfile fetch --output-dir charts