microsoft · Jinbo Wang (testforstephen) · Mar 12, 2018 · Mar 5, 2018 · Mar 5, 2018 · Mar 9, 2018
diff --git a/README.md b/README.md
@@ -47,7 +47,7 @@ Please also check the documentation of [Language Support for Java by Red Hat](ht
 ### Launch
 
 - `mainClass` (required) - The main class of the program (fully qualified name, e.g. [mymodule/]com.xyz.MainClass).
-- `args` - The command line arguments passed to the program.
+- `args` - The command line arguments passed to the program. Use `"${command:SpecifyProgramArgs}"` to prompt for program arguments.
 - `sourcePaths` - The extra source directories of the program. The debugger looks for source code from project settings by default. This option allows the debugger to look for source code in extra directories.
 - `modulePaths` - The modulepaths for launching the JVM. If not specified, the debugger will automatically resolve from current project.
 - `classPaths` - The classpaths for launching the JVM. If not specified, the debugger will automatically resolve from current project.

diff --git a/package.json b/package.json
@@ -31,7 +31,8 @@
   "activationEvents": [
     "onLanguage:java",
     "onDebugInitialConfigurations",
-    "onDebugResolve:java"
+    "onDebugResolve:java",
+    "onCommand:JavaDebug.SpecifyProgramArgs"
   ],
   "main": "./out/src/extension",
   "contributes": {
@@ -48,6 +49,9 @@
             "java"
           ]
         },
+        "variables": {
+          "SpecifyProgramArgs": "JavaDebug.SpecifyProgramArgs"
+        },
         "configurationAttributes": {
           "launch": {
             "required": [
@@ -284,6 +288,20 @@
               "args": ""
             }
           },
+          {
+            "label": "Java: Launch Program with Arguments Prompt",
+            "description": "Add a new configuration for launching a java program with arguments prompt.",
+            "body": {
+              "type": "java",
+              "name": "Debug (Launch) with Arguments Prompt",
+              "request": "launch",
+              "cwd": "^\"\\${workspaceFolder}\"",
+              "console": "internalConsole",
+              "stopOnEntry": false,
+              "mainClass": "",
+              "args": "^\"\\${command:SpecifyProgramArgs}\""
+            }
+          },
           {
             "label": "Java: Attach to Remote Program",
             "description": "Add a new configuration for attaching to a running java program.",

diff --git a/src/extension.ts b/src/extension.ts
@@ -45,6 +45,9 @@ export function activate(context: vscode.ExtensionContext) {
         }
     }
     context.subscriptions.push(vscode.debug.registerDebugConfigurationProvider("java", new JavaDebugConfigurationProvider(reporter)));
+    context.subscriptions.push(vscode.commands.registerCommand("JavaDebug.SpecifyProgramArgs", async () => {
+        return specifyProgramArguments(context);
+    }));
     initializeHotCodeReplace(context);
 }
 
@@ -55,3 +58,26 @@ export function deactivate() {
 function fetchUsageData() {
     return commands.executeJavaLanguageServerCommand(commands.JAVA_FETCH_USAGE_DATA);
 }
+
+function specifyProgramArguments(context: vscode.ExtensionContext): Thenable<string> {
+    const javaDebugProgramArgsKey = "JavaDebugProgramArgs";
+
+    const options: vscode.InputBoxOptions = {
+        ignoreFocusOut: true,
+        placeHolder: "Enter program arguments or leave empty to pass no args",
+    };
+
+    const prevArgs = context.workspaceState.get(javaDebugProgramArgsKey, "");
+    if (prevArgs.length > 0) {
+        options.value = prevArgs;
+    }
+
+    return vscode.window.showInputBox(options).then((text) => {
+        // When user cancels the input box (by pressing Esc), the text value is undefined.
+        if (text !== undefined) {
+            context.workspaceState.update(javaDebugProgramArgsKey, text);
+        }
+
+        return text || " ";
+    });
+}