Added confirmation for task overwrite if tasks.json exists.

Slight refactor moving numTasks and outputPath to top with the other variables.  Eliminates duplication, and keeps us from having to check path twice.
Resolves #65

scripts/modules/commands.js

@@ -38,7 +38,8 @@ import {
   displayNextTask,
   displayTaskById,
   displayComplexityReport,
-  getStatusWithColor
+  getStatusWithColor,
+  confirmTaskOverwrite
 } from './ui.js';
 
 /**
@@ -59,17 +60,34 @@ function registerCommands(programInstance) {
     .option('-i, --input <file>', 'Path to the PRD file (alternative to positional argument)')
     .option('-o, --output <file>', 'Output file path', 'tasks/tasks.json')
     .option('-n, --num-tasks <number>', 'Number of tasks to generate', '10')
+    .option('-f, --force', 'Skip confirmation when overwriting existing tasks')
     .action(async (file, options) => {
       // Use input option if file argument not provided
       const inputFile = file || options.input;
       const defaultPrdPath = 'scripts/prd.txt';
+      const numTasks = parseInt(options.numTasks, 10);
+      const outputPath = options.output;
+      const force = options.force || false;
+      
+      // Helper function to check if tasks.json exists and confirm overwrite
+      async function confirmOverwriteIfNeeded() {
+        if (fs.existsSync(outputPath) && !force) {
+          const shouldContinue = await confirmTaskOverwrite(outputPath);
+          if (!shouldContinue) {
+            console.log(chalk.yellow('Operation cancelled by user.'));
+            return false;
+          }
+        }
+        return true;
+      }
       
       // If no input file specified, check for default PRD location
       if (!inputFile) {
         if (fs.existsSync(defaultPrdPath)) {
           console.log(chalk.blue(`Using default PRD file: ${defaultPrdPath}`));
-          const numTasks = parseInt(options.numTasks, 10);
+          
-          const outputPath = options.output;
+          // Check for existing tasks.json before proceeding
+          if (!await confirmOverwriteIfNeeded()) return;
           
           console.log(chalk.blue(`Generating ${numTasks} tasks...`));
           await parsePRD(defaultPrdPath, outputPath, numTasks);
@@ -84,10 +102,12 @@ function registerCommands(programInstance) {
           chalk.cyan('Options:') + '\n' +
           '  -i, --input <file>       Path to the PRD file (alternative to positional argument)\n' +
           '  -o, --output <file>      Output file path (default: "tasks/tasks.json")\n' +
-          '  -n, --num-tasks <number> Number of tasks to generate (default: 10)\n\n' +
+          '  -n, --num-tasks <number> Number of tasks to generate (default: 10)\n' +
+          '  -f, --force              Skip confirmation when overwriting existing tasks\n\n' +
           chalk.cyan('Example:') + '\n' +
           '  task-master parse-prd requirements.txt --num-tasks 15\n' +
-          '  task-master parse-prd --input=requirements.txt\n\n' +
+          '  task-master parse-prd --input=requirements.txt\n' +
+          '  task-master parse-prd --force\n\n' +
           chalk.yellow('Note: This command will:') + '\n' +
           '  1. Look for a PRD file at scripts/prd.txt by default\n' +
           '  2. Use the file specified by --input or positional argument if provided\n' +
@@ -97,8 +117,8 @@ function registerCommands(programInstance) {
         return;
       }
       
-      const numTasks = parseInt(options.numTasks, 10);
+      // Check for existing tasks.json before proceeding with specified input file
-      const outputPath = options.output;
+      if (!await confirmOverwriteIfNeeded()) return;
       
       console.log(chalk.blue(`Parsing PRD file: ${inputFile}`));
       console.log(chalk.blue(`Generating ${numTasks} tasks...`));

scripts/modules/ui.js

@@ -1052,6 +1052,33 @@ async function displayComplexityReport(reportPath) {
   ));
 }
 
+/**
+ * Confirm overwriting existing tasks.json file
+ * @param {string} tasksPath - Path to the tasks.json file
+ * @returns {Promise<boolean>} - Promise resolving to true if user confirms, false otherwise
+ */
+async function confirmTaskOverwrite(tasksPath) {
+  console.log(boxen(
+    chalk.yellow('It looks like you\'ve already generated tasks for this project.\n') +
+    chalk.yellow('Executing this command will overwrite any existing tasks.'),
+    { padding: 1, borderColor: 'yellow', borderStyle: 'round', margin: { top: 1 } }
+  ));
+  
+  // Use dynamic import to get the readline module
+  const readline = await import('readline');
+  const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout
+  });
+  
+  const answer = await new Promise(resolve => {
+    rl.question(chalk.cyan('Are you sure you wish to continue? (y/N): '), resolve);
+  });
+  rl.close();
+  
+  return answer.toLowerCase() === 'y' || answer.toLowerCase() === 'yes';
+}
+
 // Export UI functions
 export {
   displayBanner,
@@ -1065,4 +1092,5 @@ export {
   displayNextTask,
   displayTaskById,
   displayComplexityReport,
+  confirmTaskOverwrite
 };