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//! Config used by the language server.
//!
//! We currently get this config from `initialize` LSP request, which is not the
//! best way to do it, but was the simplest thing we could implement.
//!
//! Of particular interest is the `feature_flags` hash map: while other fields
//! configure the server itself, feature flags are passed into analysis, and
//! tweak things like automatic insertion of `()` in completions.
use rustc_hash::FxHashMap;
use ra_project_model::CargoFeatures;
use serde::{Deserialize, Deserializer};
/// Client provided initialization options
#[derive(Deserialize, Clone, Debug, PartialEq, Eq)]
#[serde(rename_all = "camelCase", default)]
pub struct ServerConfig {
/// Whether the client supports our custom highlighting publishing decorations.
/// This is different to the highlightingOn setting, which is whether the user
/// wants our custom highlighting to be used.
///
/// Defaults to `false`
#[serde(deserialize_with = "nullable_bool_false")]
pub publish_decorations: bool,
pub exclude_globs: Vec<String>,
#[serde(deserialize_with = "nullable_bool_false")]
pub use_client_watching: bool,
pub lru_capacity: Option<usize>,
pub max_inlay_hint_length: Option<usize>,
pub cargo_watch_enable: bool,
pub cargo_watch_args: Vec<String>,
pub cargo_watch_command: String,
pub cargo_watch_all_targets: bool,
/// For internal usage to make integrated tests faster.
#[serde(deserialize_with = "nullable_bool_true")]
pub with_sysroot: bool,
/// Fine grained feature flags to disable specific features.
pub feature_flags: FxHashMap<String, bool>,
/// Cargo feature configurations.
pub cargo_features: CargoFeatures,
}
impl Default for ServerConfig {
fn default() -> ServerConfig {
ServerConfig {
publish_decorations: false,
exclude_globs: Vec::new(),
use_client_watching: false,
lru_capacity: None,
max_inlay_hint_length: None,
cargo_watch_enable: true,
cargo_watch_args: Vec::new(),
cargo_watch_command: "check".to_string(),
cargo_watch_all_targets: true,
with_sysroot: true,
feature_flags: FxHashMap::default(),
cargo_features: Default::default(),
}
}
}
/// Deserializes a null value to a bool false by default
fn nullable_bool_false<'de, D>(deserializer: D) -> Result<bool, D::Error>
where
D: Deserializer<'de>,
{
let opt = Option::deserialize(deserializer)?;
Ok(opt.unwrap_or(false))
}
/// Deserializes a null value to a bool true by default
fn nullable_bool_true<'de, D>(deserializer: D) -> Result<bool, D::Error>
where
D: Deserializer<'de>,
{
let opt = Option::deserialize(deserializer)?;
Ok(opt.unwrap_or(true))
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn deserialize_init_options_defaults() {
// check that null == default for both fields
let default = ServerConfig::default();
assert_eq!(default, serde_json::from_str(r#"{}"#).unwrap());
assert_eq!(
default,
serde_json::from_str(r#"{"publishDecorations":null, "lruCapacity":null}"#).unwrap()
);
}
}
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