* feat(lsp): configurable diagnostic severity
Allow severity of diagnostic messages to be configured.
E.g. allow turning of Hint level diagnostics.
Fixes: https://github.com/helix-editor/helix/issues/1007
* Use language_config() method
* Add documentation for diagnostic_severity
* Use unreachable for unknown severity level
* fix: documentation for diagnostic_severity config
These are the available keys and descriptions for the file.
| Key | Description |
| ---- | ----------- |
| name | The name of the language |
| scope | A string like `source.js` that identifies the language. Currently, we strive to match the scope names used by popular TextMate grammars and by the Linguist library. Usually `source.<name>` or `text.<name>` in case of markup languages |
| injection-regex | regex pattern that will be tested against a language name in order to determine whether this language should be used for a potential [language injection][treesitter-language-injection] site. |
| file-types | The filetypes of the language, for example `["yml", "yaml"]` |
| shebangs | The interpreters from the shebang line, for example `["sh", "bash"]` |
| roots | A set of marker files to look for when trying to find the workspace root. For example `Cargo.lock`, `yarn.lock` |
| auto-format | Whether to autoformat this language when saving |
| comment-token | The token to use as a comment-token |
| indent | The indent to use. Has sub keys `tab-width` and `unit` |
| config | Language server configuration |
| Key | Description |
| ---- | ----------- |
| name | The name of the language |
| scope | A string like `source.js` that identifies the language. Currently, we strive to match the scope names used by popular TextMate grammars and by the Linguist library. Usually `source.<name>` or `text.<name>` in case of markup languages |
| injection-regex | regex pattern that will be tested against a language name in order to determine whether this language should be used for a potential [language injection][treesitter-language-injection] site. |
| file-types | The filetypes of the language, for example `["yml", "yaml"]` |
| shebangs | The interpreters from the shebang line, for example `["sh", "bash"]` |
| roots | A set of marker files to look for when trying to find the workspace root. For example `Cargo.lock`, `yarn.lock` |
| auto-format | Whether to autoformat this language when saving |
| diagnostic-severity | Minimal severity of diagnostic for it to be displayed. (Allowed values: `Error`, `Warning`, `Info`, `Hint`) |
| comment-token | The token to use as a comment-token |
| indent | The indent to use. Has sub keys `tab-width` and `unit` |