allow configurable log level

Author: Strum355

package.json

@@ -64,6 +64,12 @@
           "type": "boolean",
           "default": false,
           "description": "[DEBUG] Enable to skip bootstrapping the language server binary from Github. Set this to use a manually provided language server binary."
+        },
+        "mcglsl.logLevel": {
+          "type": "string",
+          "default": "info",
+          "enum": ["trace", "debug", "info", "warn", "error"],
+          "description": "Change the log level of the language server. This change happens live and does not require a restart."
         }
       }
     }

server/src/configuration.rs

@@ -0,0 +1,12 @@
+use std::str::FromStr;
+
+use slog::Level;
+use slog_scope::error;
+
+
+pub fn handle_log_level_change<F: FnOnce(Level)>(log_level: String, callback: F) {
+    match Level::from_str(log_level.as_str()) {
+        Ok(level) => callback(level),
+        Err(_) => error!("got unexpected log level from config"; "level" => log_level),
+    };
+}

server/src/main.rs

@@ -40,6 +40,7 @@ use lazy_static::lazy_static;
 mod commands;
 mod consts;
 mod dfs;
+mod configuration;
 mod graph;
 mod lsp_ext;
 mod merge_views;
@@ -604,6 +605,20 @@ impl LanguageServerHandling for MinecraftShaderLanguageServer {
 
     fn workspace_change_configuration(&mut self, params: DidChangeConfigurationParams) {
         logging::slog_with_trace_id(|| {
+            #[derive(Deserialize)]
+            struct Configuration {
+                #[serde(alias ="logLevel")]
+                log_level: String
+            }
+
+            let config: Configuration = from_value(params.settings.as_object().unwrap().get("mcglsl").unwrap().to_owned()).unwrap();
+
+            info!("got updated configuration"; "config" => params.settings.as_object().unwrap().get("mcglsl").unwrap().to_string());
+            
+            configuration::handle_log_level_change(config.log_level, |level| {
+                self._log_guard = None; // set to None so Drop is invoked
+                self._log_guard = Some(logging::set_logger_with_level(level));
+            })
         });
     }