fix: optimize memory usage for Swift project analysis

- Add Swift project detection utility to identify Swift/iOS projects
- Implement reduced file limits (max 100 files) for Swift projects to prevent OOM
- Optimize ripgrep buffer processing with smaller chunks (64KB) for better memory management
- Add streaming improvements to process file listings more efficiently
- Add comprehensive tests for Swift project detection

This fixes the out-of-memory crashes when analyzing large Swift projects
by limiting the number of files loaded into memory at once.

Fixes #7345

src/core/environment/getEnvironmentDetails.ts

@@ -17,6 +17,7 @@ import { TerminalRegistry } from "../../integrations/terminal/TerminalRegistry"
 import { Terminal } from "../../integrations/terminal/Terminal"
 import { arePathsEqual } from "../../utils/path"
 import { formatResponse } from "../prompts/responses"
+import { getProjectFileLimit } from "../../utils/projectDetection"
 
 import { Task } from "../task/Task"
 import { formatReminderSection } from "./reminder"
@@ -252,7 +253,15 @@ export async function getEnvironmentDetails(cline: Task, includeFileDetails: boo
 			if (maxFiles === 0) {
 				details += "(Workspace files context disabled. Use list_files to explore if needed.)"
 			} else {
-				const [files, didHitLimit] = await listFiles(cline.cwd, true, maxFiles)
+				// Apply project-specific file limits to prevent memory issues
+				const effectiveLimit = await getProjectFileLimit(cline.cwd, maxFiles)
+
+				// If we're using a reduced limit for a Swift project, add a note
+				if (effectiveLimit < maxFiles) {
+					details += `\n(Note: File listing limited to ${effectiveLimit} files for Swift project memory optimization)`
+				}
+
+				const [files, didHitLimit] = await listFiles(cline.cwd, true, effectiveLimit)
 				const { showRooIgnoredFiles = true } = state ?? {}
 
 				const result = formatResponse.formatFilesList(

src/services/glob/list-files.ts

@@ -627,6 +627,9 @@ async function execRipgrep(rgPath: string, args: string[], limit: number): Promi
 		let output = ""
 		let results: string[] = []
 
+		// Use a smaller buffer size to process data more frequently and reduce memory usage
+		const MAX_BUFFER_SIZE = 1024 * 64 // 64KB buffer instead of unlimited
+
 		// Set timeout to avoid hanging
 		const timeoutId = setTimeout(() => {
 			rgProcess.kill()
@@ -637,7 +640,11 @@ async function execRipgrep(rgPath: string, args: string[], limit: number): Promi
 		// Process stdout data as it comes in
 		rgProcess.stdout.on("data", (data) => {
 			output += data.toString()
-			processRipgrepOutput()
+
+			// Process output more frequently to avoid large memory buffers
+			if (output.length > MAX_BUFFER_SIZE || output.split("\n").length > 100) {
+				processRipgrepOutput()
+			}
 
 			// Kill the process if we've reached the limit
 			if (results.length >= limit) {
@@ -691,6 +698,8 @@ async function execRipgrep(rgPath: string, args: string[], limit: number): Promi
 					// Keep the relative path as returned by ripgrep
 					results.push(line)
 				} else if (results.length >= limit) {
+					// Clear the output buffer when we hit the limit to free memory
+					output = ""
 					break
 				}
 			}

src/utils/__tests__/projectDetection.spec.ts

@@ -0,0 +1,127 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest"
+import * as fs from "fs"
+import * as path from "path"
+import { isSwiftProject, getProjectFileLimit } from "../projectDetection"
+
+vi.mock("fs", () => ({
+	promises: {
+		readdir: vi.fn(),
+		stat: vi.fn(),
+	},
+}))
+
+describe("projectDetection", () => {
+	beforeEach(() => {
+		vi.clearAllMocks()
+	})
+
+	afterEach(() => {
+		vi.restoreAllMocks()
+	})
+
+	describe("isSwiftProject", () => {
+		it("should detect Swift project with Package.swift", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["Package.swift", "Sources", "Tests"] as any)
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(true)
+		})
+
+		it("should detect Swift project with .xcodeproj", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["MyApp.xcodeproj", "MyApp", "MyAppTests"] as any)
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(true)
+		})
+
+		it("should detect Swift project with .xcworkspace", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["MyApp.xcworkspace", "MyApp.xcodeproj", "Pods"] as any)
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(true)
+		})
+
+		it("should detect Swift project with Podfile", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["Podfile", "Podfile.lock", "MyApp"] as any)
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(true)
+		})
+
+		it("should detect Swift project with Cartfile", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["Cartfile", "Cartfile.resolved", "MyApp"] as any)
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(true)
+		})
+
+		it("should detect Swift project with .swift files in root", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["main.swift", "AppDelegate.swift", "README.md"] as any)
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(true)
+		})
+
+		it("should detect Swift project with Sources directory containing Swift files", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValueOnce(["Sources", "Tests", "README.md"] as any)
+
+			vi.mocked(fs.promises.stat).mockResolvedValue({
+				isDirectory: () => true,
+			} as any)
+
+			vi.mocked(fs.promises.readdir).mockResolvedValueOnce(["App.swift", "Model.swift"] as any)
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(true)
+		})
+
+		it("should not detect non-Swift project", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue([
+				"package.json",
+				"node_modules",
+				"src",
+				"README.md",
+			] as any)
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(false)
+		})
+
+		it("should handle errors gracefully", async () => {
+			vi.mocked(fs.promises.readdir).mockRejectedValue(new Error("Permission denied"))
+
+			const result = await isSwiftProject("/test/project")
+			expect(result).toBe(false)
+		})
+	})
+
+	describe("getProjectFileLimit", () => {
+		it("should return reduced limit for Swift projects", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["Package.swift", "Sources"] as any)
+
+			const result = await getProjectFileLimit("/test/project", 200)
+			expect(result).toBe(100)
+		})
+
+		it("should return reduced limit not exceeding 100 for Swift projects", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["MyApp.xcodeproj"] as any)
+
+			const result = await getProjectFileLimit("/test/project", 500)
+			expect(result).toBe(100)
+		})
+
+		it("should return default limit for non-Swift projects", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["package.json", "src"] as any)
+
+			const result = await getProjectFileLimit("/test/project", 200)
+			expect(result).toBe(200)
+		})
+
+		it("should return smaller default if it's less than 100 for Swift projects", async () => {
+			vi.mocked(fs.promises.readdir).mockResolvedValue(["Package.swift"] as any)
+
+			const result = await getProjectFileLimit("/test/project", 50)
+			expect(result).toBe(50)
+		})
+	})
+})

src/utils/projectDetection.ts

@@ -0,0 +1,86 @@
+import * as fs from "fs"
+import * as path from "path"
+
+/**
+ * Detects if a directory contains a Swift project
+ * @param dirPath - The directory path to check
+ * @returns true if it's a Swift project, false otherwise
+ */
+export async function isSwiftProject(dirPath: string): Promise<boolean> {
+	try {
+		// Check for common Swift project indicators
+		const swiftIndicators = [
+			"Package.swift", // Swift Package Manager
+			"*.xcodeproj", // Xcode project
+			"*.xcworkspace", // Xcode workspace
+			"Podfile", // CocoaPods
+			"Cartfile", // Carthage
+		]
+
+		const entries = await fs.promises.readdir(dirPath)
+
+		for (const entry of entries) {
+			// Check for exact matches
+			if (swiftIndicators.includes(entry)) {
+				return true
+			}
+
+			// Check for pattern matches (e.g., *.xcodeproj)
+			for (const indicator of swiftIndicators) {
+				if (indicator.includes("*")) {
+					const pattern = indicator.replace("*", "")
+					if (entry.endsWith(pattern)) {
+						return true
+					}
+				}
+			}
+		}
+
+		// Also check if there are .swift files in the root directory
+		const swiftFiles = entries.filter((entry) => entry.endsWith(".swift"))
+		if (swiftFiles.length > 0) {
+			return true
+		}
+
+		// Check for iOS/macOS specific directories
+		const iosIndicators = ["Sources", "Tests", "UITests"]
+		for (const indicator of iosIndicators) {
+			const indicatorPath = path.join(dirPath, indicator)
+			try {
+				const stats = await fs.promises.stat(indicatorPath)
+				if (stats.isDirectory()) {
+					// Check if this directory contains Swift files
+					const subEntries = await fs.promises.readdir(indicatorPath)
+					const hasSwiftFiles = subEntries.some((entry) => entry.endsWith(".swift"))
+					if (hasSwiftFiles) {
+						return true
+					}
+				}
+			} catch {
+				// Directory doesn't exist, continue checking
+			}
+		}
+
+		return false
+	} catch (error) {
+		console.error(`Error detecting Swift project: ${error}`)
+		return false
+	}
+}
+
+/**
+ * Gets the recommended file limit for a project based on its type
+ * @param dirPath - The directory path to check
+ * @param defaultLimit - The default limit to use
+ * @returns The recommended file limit
+ */
+export async function getProjectFileLimit(dirPath: string, defaultLimit: number): Promise<number> {
+	// For Swift projects, use a more conservative limit to prevent memory issues
+	if (await isSwiftProject(dirPath)) {
+		// Swift projects often have large dependency trees and generated files
+		// Use a smaller limit to prevent memory exhaustion
+		return Math.min(defaultLimit, 100)
+	}
+
+	return defaultLimit
+}