Method handleUpdateFile

src/core/tools/ApplyPatchTool.ts:290–451

(
		change: ApplyPatchFileChange,
		absolutePath: string,
		relPath: string,
		task: Task,
		callbacks: ToolCallbacks,
		isWriteProtected: boolean,
	)

	}

	private async handleUpdateFile(
		change: ApplyPatchFileChange,
		absolutePath: string,
		relPath: string,
		task: Task,
		callbacks: ToolCallbacks,
		isWriteProtected: boolean,
	): Promise<void> {
		const { askApproval, pushToolResult } = callbacks

		// Check if file exists
		const fileExists = await fileExistsAtPath(absolutePath)
		if (!fileExists) {
			task.consecutiveMistakeCount++
			task.recordToolError("apply_patch")
			const errorMessage = `File not found: ${relPath}. Cannot update a non-existent file.`
			await task.say("error", errorMessage)
			pushToolResult(formatResponse.toolError(errorMessage))
			return
		}

		const originalContent = change.originalContent || ""
		const newContent = change.newContent || ""
		const isOutsideWorkspace = isPathOutsideWorkspace(absolutePath)

		// Initialize diff view
		task.diffViewProvider.editType = "modify"
		task.diffViewProvider.originalContent = originalContent

		// Generate and validate diff
		const diff = formatResponse.createPrettyPatch(relPath, originalContent, newContent)
		if (!diff) {
			pushToolResult(`No changes needed for '${relPath}'`)
			await task.diffViewProvider.reset()
			return
		}

		// Check experiment settings
		const provider = task.providerRef.deref()
		const state = await provider?.getState()
		const diagnosticsEnabled = state?.diagnosticsEnabled ?? true
		const writeDelayMs = state?.writeDelayMs ?? DEFAULT_WRITE_DELAY_MS
		const isPreventFocusDisruptionEnabled = experiments.isEnabled(
			state?.experiments ?? {},
			EXPERIMENT_IDS.PREVENT_FOCUS_DISRUPTION,
		)

		const sanitizedDiff = sanitizeUnifiedDiff(diff)
		const diffStats = computeDiffStats(sanitizedDiff) || undefined

		const sharedMessageProps: ClineSayTool = {
			tool: "appliedDiff",
			path: getReadablePath(task.cwd, relPath),
			diff: sanitizedDiff,
			originalContent,
			isOutsideWorkspace,
		}