feat: add module 9 for cherry picking

module-09-cherry-pick/setup.ps1

@@ -0,0 +1,208 @@
+#!/usr/bin/env pwsh
+
+<#
+.SYNOPSIS
+    Sets up the cherry-pick challenge environment.
+
+.DESCRIPTION
+    Creates a Git repository with a development branch containing both
+    bug fixes and experimental features. Students must cherry-pick only
+    the bug fixes to the main branch.
+#>
+
+# Remove existing challenge directory if present
+if (Test-Path "challenge") {
+    Write-Host "Removing existing challenge directory..." -ForegroundColor Yellow
+    Remove-Item -Path "challenge" -Recurse -Force
+}
+
+# Create challenge directory
+Write-Host "Creating challenge environment..." -ForegroundColor Cyan
+New-Item -ItemType Directory -Path "challenge" | Out-Null
+Set-Location "challenge"
+
+# Initialize git repository
+git init | Out-Null
+git config user.name "Workshop User" | Out-Null
+git config user.email "user@workshop.local" | Out-Null
+
+# Create initial commits on main branch
+$app = @"
+class App {
+  constructor() {
+    this.version = '1.0.0';
+  }
+
+  start() {
+    console.log('App started');
+  }
+}
+
+module.exports = App;
+"@
+
+Set-Content -Path "app.js" -Value $app
+git add app.js
+git commit -m "Initial app implementation" | Out-Null
+
+$readme = @"
+# Application
+
+Version 1.0.0
+"@
+
+Set-Content -Path "README.md" -Value $readme
+git add README.md
+git commit -m "Add README" | Out-Null
+
+# Create development branch
+git checkout -b development | Out-Null
+
+# Commit 1: Experimental feature (should NOT be cherry-picked)
+$appWithExperimental = @"
+class App {
+  constructor() {
+    this.version = '1.0.0';
+    this.experimentalMode = false;
+  }
+
+  start() {
+    console.log('App started');
+    if (this.experimentalMode) {
+      this.enableExperimentalFeatures();
+    }
+  }
+
+  enableExperimentalFeatures() {
+    console.log('Experimental features enabled');
+  }
+}
+
+module.exports = App;
+"@
+
+Set-Content -Path "app.js" -Value $appWithExperimental
+git add app.js
+git commit -m "Add experimental AI features" | Out-Null
+
+# Commit 2: Security bug fix (SHOULD be cherry-picked)
+$security = @"
+class Security {
+  static sanitizeInput(input) {
+    // Remove potential XSS attacks
+    return input.replace(/[<>]/g, '');
+  }
+
+  static validateToken(token) {
+    if (!token || token.length < 32) {
+      throw new Error('Invalid security token');
+    }
+    return true;
+  }
+}
+
+module.exports = Security;
+"@
+
+Set-Content -Path "security.js" -Value $security
+git add security.js
+git commit -m "Fix security vulnerability in input validation" | Out-Null
+
+# Commit 3: Another experimental feature (should NOT be cherry-picked)
+$appWithMoreExperimental = @"
+class App {
+  constructor() {
+    this.version = '1.0.0';
+    this.experimentalMode = false;
+    this.betaFeatures = [];
+  }
+
+  start() {
+    console.log('App started');
+    if (this.experimentalMode) {
+      this.enableExperimentalFeatures();
+    }
+  }
+
+  enableExperimentalFeatures() {
+    console.log('Experimental features enabled');
+  }
+
+  addBetaFeature(feature) {
+    this.betaFeatures.push(feature);
+  }
+}
+
+module.exports = App;
+"@
+
+Set-Content -Path "app.js" -Value $appWithMoreExperimental
+git add app.js
+git commit -m "Add beta features framework" | Out-Null
+
+# Commit 4: Performance bug fix (SHOULD be cherry-picked)
+$appWithPerformance = @"
+class App {
+  constructor() {
+    this.version = '1.0.0';
+    this.experimentalMode = false;
+    this.betaFeatures = [];
+    this.cache = new Map();
+  }
+
+  start() {
+    console.log('App started');
+    if (this.experimentalMode) {
+      this.enableExperimentalFeatures();
+    }
+  }
+
+  enableExperimentalFeatures() {
+    console.log('Experimental features enabled');
+  }
+
+  addBetaFeature(feature) {
+    this.betaFeatures.push(feature);
+  }
+
+  getData(key) {
+    // Use cache to improve performance
+    if (this.cache.has(key)) {
+      return this.cache.get(key);
+    }
+    const data = this.fetchData(key);
+    this.cache.set(key, data);
+    return data;
+  }
+
+  fetchData(key) {
+    // Simulate data fetching
+    return { key: key, value: 'data' };
+  }
+}
+
+module.exports = App;
+"@
+
+Set-Content -Path "app.js" -Value $appWithPerformance
+git add app.js
+git commit -m "Fix performance issue with data caching" | Out-Null
+
+# Return to module directory
+Set-Location ..
+
+Write-Host "`n========================================" -ForegroundColor Green
+Write-Host "Challenge environment created!" -ForegroundColor Green
+Write-Host "========================================" -ForegroundColor Green
+Write-Host "`nYou are on the 'development' branch with multiple commits:" -ForegroundColor Cyan
+Write-Host "- Experimental features (not ready for production)" -ForegroundColor Yellow
+Write-Host "- Critical bug fixes (needed in production NOW)" -ForegroundColor Green
+Write-Host "`nYour task:" -ForegroundColor Yellow
+Write-Host "1. Navigate to the challenge directory: cd challenge" -ForegroundColor White
+Write-Host "2. View the development branch commits: git log --oneline" -ForegroundColor White
+Write-Host "3. Identify which commits are bug fixes (look for 'Fix' in messages)" -ForegroundColor White
+Write-Host "4. Switch to main branch: git checkout main" -ForegroundColor White
+Write-Host "5. Cherry-pick ONLY the bug fix commits to main" -ForegroundColor White
+Write-Host "6. Do NOT bring the experimental features to main" -ForegroundColor White
+Write-Host "`nHint: Look for commits mentioning 'security' and 'performance' fixes" -ForegroundColor Cyan
+Write-Host "Run '../verify.ps1' from the challenge directory to check your solution.`n" -ForegroundColor Cyan