homebridge-tasmota-control/src/functions.js

Homebridge plugin to control Tasmota flashed devices.

import { promises as fsPromises } from 'fs';

class Functions {
    constructor(config) {
    }

    async saveData(path, data, stringify = true) {
        try {
            data = stringify ? JSON.stringify(data, null, 2) : data;
            await fsPromises.writeFile(path, data);
            return true;
        } catch (error) {
            throw new Error(`Save data error: ${error}`);
        }
    }

    async readData(path, parseJson = false) {
        try {
            const data = await fsPromises.readFile(path, 'utf8');

            if (parseJson) {
                if (!data.trim()) {
                    // Empty file when expecting JSON
                    return null;
                }
                try {
                    return JSON.parse(data);
                } catch (jsonError) {
                    throw new Error(`JSON parse error in file "${path}": ${jsonError.message}`);
                }
            }

            // For non-JSON, just return file content (can be empty string)
            return data;
        } catch (error) {
            if (error.code === 'ENOENT') {
                // File does not exist
                return null;
            }
            // Preserve original error details
            const wrappedError = new Error(`Read data error for "${path}": ${error.message}`);
            wrappedError.original = error;
            throw wrappedError;
        }
    }

    async scaleValue(value, inMin, inMax, outMin, outMax) {
        const scaledValue = parseFloat((((Math.max(inMin, Math.min(inMax, value)) - inMin) * (outMax - outMin)) / (inMax - inMin) + outMin).toFixed(0));
        return scaledValue;
    }
}
export default Functions