3 files changed, 25 insertions, 2 deletions

diff --git a/editors/code/package.json b/editors/code/package.json
index ec325ad3f..34dbea0b2 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -443,6 +443,11 @@
                     "type": "object",
                     "default": {},
                     "description": "Optional settings passed to the debug engine. Example:\n{ \"lldb\": { \"terminal\":\"external\"} }"
+                },
+                "rust-analyzer.debug.useLaunchJson": {
+                    "description": "Whether to use existing configurations from launch.json.",
+                    "type": "boolean",
+                    "default": false
                 }
             }
         },
diff --git a/editors/code/src/config.ts b/editors/code/src/config.ts
index be2e27aec..24002483d 100644
--- a/editors/code/src/config.ts
+++ b/editors/code/src/config.ts
@@ -117,6 +117,7 @@ export class Config {
             engineSettings: this.get<object>("debug.engineSettings"),
             openUpDebugPane: this.get<boolean>("debug.openUpDebugPane"),
             sourceFileMap: sourceFileMap,
+            useLaunchJson: this.get<object>("debug.useLaunchJson"),
         };
     }
 }
diff --git a/editors/code/src/debug.ts b/editors/code/src/debug.ts
index cc5755611..bbf3ff312 100644
--- a/editors/code/src/debug.ts
+++ b/editors/code/src/debug.ts
@@ -95,10 +95,27 @@ export async function getDebugConfiguration(ctx: Ctx, config: ra.Runnable): Prom
 }
 
 export async function startDebugSession(ctx: Ctx, config: ra.Runnable): Promise<boolean> {
-    const debugConfig = await getDebugConfiguration(ctx, config);
+    let debugConfig: vscode.DebugConfiguration | undefined = undefined;
+    let message = "";
+
+    if (ctx.config.debug.useLaunchJson) {
+        const wsLaunchSection = vscode.workspace.getConfiguration("launch");
+        const configurations = wsLaunchSection.get<any[]>("configurations") || [];
+
+        const index = configurations.findIndex(c => c.name === config.label);
+        if (-1 !== index) {
+            debugConfig = configurations[index];
+            message = " (from launch.json)";
+            debugOutput.clear();
+        }
+    }
+    if (!debugConfig) {
+        debugConfig = await getDebugConfiguration(ctx, config);
+    }
+
     if (!debugConfig) return false;
 
-    debugOutput.appendLine("Launching debug configuration:");
+    debugOutput.appendLine(`Launching debug configuration${message}:`);
     debugOutput.appendLine(JSON.stringify(debugConfig, null, 2));
     return vscode.debug.startDebugging(undefined, debugConfig);
 }