Function migrateCustomModesToYaml

src/utils/migrateSettings.ts:72–118

* Special migration function to convert custom_modes.json to YAML format

(settingsDir: string, outputChannel: vscode.OutputChannel)

 * Special migration function to convert custom_modes.json to YAML format
 */
async function migrateCustomModesToYaml(settingsDir: string, outputChannel: vscode.OutputChannel): Promise<void> {
	const oldJsonPath = path.join(settingsDir, deprecatedCustomModesJSONFilename)
	const newYamlPath = path.join(settingsDir, GlobalFileNames.customModes)

	// Only proceed if JSON exists and YAML doesn't
	const jsonExists = await fileExistsAtPath(oldJsonPath)
	const yamlExists = await fileExistsAtPath(newYamlPath)

	if (!jsonExists) {
		outputChannel.appendLine("No custom_modes.json found, skipping YAML migration")
		return
	}

	if (yamlExists) {
		outputChannel.appendLine("custom_modes.yaml already exists, skipping migration")
		return
	}

	try {
		// Read JSON content
		const jsonContent = await fs.readFile(oldJsonPath, "utf-8")

		try {
			// Parse JSON to object (using the yaml library just to be safe/consistent)
			const customModesData = yaml.parse(jsonContent)

			// Convert to YAML with no line width limit to prevent line breaks
			const yamlContent = yaml.stringify(customModesData, { lineWidth: 0 })

			// Write YAML file
			await fs.writeFile(newYamlPath, yamlContent, "utf-8")

			// Keeping the old JSON file for backward compatibility
			// This allows users to roll back if needed
			outputChannel.appendLine(
				"Successfully migrated custom_modes.json to YAML format (original JSON file preserved for rollback purposes)",
			)
		} catch (parseError) {
			// Handle corrupt JSON file
			outputChannel.appendLine(
				`Error parsing custom_modes.json: ${parseError}. File might be corrupted. Skipping migration.`,
			)
		}
	} catch (fileError) {
		outputChannel.appendLine(`Error reading custom_modes.json: ${fileError}. Skipping migration.`)
	}
}

/**
 * Removes commands from old defaults that could execute arbitrary code