Add support to specifiy server name to send the correct initializationOptions

Author: martskins

Cargo.lock

@@ -42,3 +42,6 @@ thiserror = "1.0.20"
 lazy_static = "1.4.0"
 tracing = { version = "0.1", features = ["log", "log-always"] }
 tracing-log = "0.1.1"
+
+[dev-dependencies]
+tempfile = "3.1.0"

Cargo.toml

@@ -231,9 +231,34 @@ path this is relative to the workspace directory. If several paths are
 provided, then the corresponding settings are merged with precedence going to
 the last file.
 
+The initialization options found in the files in this config are combined with
+the initialization options specified in the server command, if any. The former
+taking precedence over the latter.
+
+Note that the key under which the initialization options for each server lives
+matches the key under which the server expects it's configuration. This is
+important for servers that can request configuration via a
+`workspace/configuration` request.
+
+Previously, the initialization options lived under a `initializationOptions`
+key, which worked, but made answering that `workspace/configuration` request
+hard, since we couldn't really get the correct path to the setting the server
+requested. Since version 0.1.161 of this plugin, that key has been deprecated
+and you'll see a message saying that you should move off of it if your settings
+file includes an `initializationOptions` key.
+
 Example settings file content: >
     {
-        "rust.clippy_preference": "on"
+        "gopls": {
+          "usePlaceholders": true,
+          "local": "github.com/my/pkg",
+        },
+        "rust-analyzer": {
+          "inlayHints": {
+            "enable": true,
+            "chainingHints": true
+          },
+        },
     }
 
 Default: ".vim/settings.json"

doc/LanguageClient.txt

@@ -21,9 +21,9 @@ pub struct LanguageClient {
 }
 
 impl LanguageClient {
-    pub fn new(version: String, state: State) -> Self {
+    pub fn new(version: impl Into<String>, state: State) -> Self {
         LanguageClient {
-            version,
+            version: version.into(),
             state_mutex: Arc::new(Mutex::new(state)),
             clients_mutex: Arc::new(Mutex::new(HashMap::new())),
         }