release: v0.2.0

Comprehensive release containing structural, UX, and behavioral upgrades since v0.1.0:

1. Namespace Transition: Renamed core executable and project namespaces from 'smart-monitor' to 'smart-shutdown'.
2. Objective Vocabulary Refactoring: Normalized output strings and logging descriptors system-wide to a strict, professional tone.
3. Advanced Status Query: 'status' subcommand now retrieves the parsed configuration, log locations/sizes, and tails the last 10 lines of the local log file.
4. Runtime Configuration Setter: Introduced 'config set' subcommand to modify the configuration file with strict type validations.
5. Auto-System Deployment: Remapped 'install' to clone the executable into system domains and register global PATH variables.
6. Cleaner Removal: 'uninstall' purges binary clones and clears environmental variables, leaving zero traces.
7. Documentation Rewrite: Generated an objective README file featuring copy-paste ready Markdown blocks.

pkg/config/config.go

@@ -2,20 +2,21 @@ package config
 
 import (
 	"encoding/json"
+	"fmt"
+	"net"
 	"os"
 	"path/filepath"
 	"runtime"
+	"strconv"
 )
 
-// Config 存储程序的各类配置常量，支持通过读取 json 文件动态修改
 type Config struct {
-	TargetIP             string `json:"TargetIP"`             // 检测目标 IP，默认 192.168.3.3
-	MonitorWindowSeconds int    `json:"MonitorWindowSeconds"` // 监控窗口期内持续失败才触发关机
-	ShutdownCountdown    int    `json:"ShutdownCountdown"`    // 关机倒计时时间
-	NormalPingInterval   int    `json:"NormalPingInterval"`   // 正常状态下的 ping 间隔
+	TargetIP             string `json:"TargetIP"`
+	MonitorWindowSeconds int    `json:"MonitorWindowSeconds"`
+	ShutdownCountdown    int    `json:"ShutdownCountdown"`
+	NormalPingInterval   int    `json:"NormalPingInterval"`
 }
 
-// DefaultConfig 提供一套开箱即用的默认配置
 func DefaultConfig() *Config {
 	return &Config{
 		TargetIP:             "192.168.3.3",
@@ -25,7 +26,6 @@ func DefaultConfig() *Config {
 	}
 }
 
-// GetConfigDir 根据当前操作系统返回标准的配置存放路径
 func GetConfigDir() string {
 	if runtime.GOOS == "windows" {
 		return `C:\ProgramData\SmartNetworkMonitor`
@@ -33,7 +33,6 @@ func GetConfigDir() string {
 	return `/etc/smart-network-monitor`
 }
 
-// GetLogDir 根据当前操作系统返回标准的日志存放路径
 func GetLogDir() string {
 	if runtime.GOOS == "windows" {
 		return `C:\ProgramData\SmartNetworkMonitor\logs`
@@ -41,7 +40,6 @@ func GetLogDir() string {
 	return `/var/log/smart-network-monitor`
 }
 
-// LoadConfig 从系统标准路径读取 config.json 并反序列化。如果不存在，则返回默认配置。
 func LoadConfig() (*Config, error) {
 	configDir := GetConfigDir()
 	configPath := filepath.Join(configDir, "config.json")
@@ -49,7 +47,6 @@ func LoadConfig() (*Config, error) {
 	data, err := os.ReadFile(configPath)
 	if err != nil {
 		if os.IsNotExist(err) {
-			// 文件不存在时，静默采用默认配置
 			return DefaultConfig(), nil
 		}
 		return nil, err
@@ -65,3 +62,54 @@ func LoadConfig() (*Config, error) {
 	}
 	return cfg, nil
 }
+
+func SaveConfig(cfg *Config) error {
+	configDir := GetConfigDir()
+	if err := os.MkdirAll(configDir, 0755); err != nil {
+		return err
+	}
+	configPath := filepath.Join(configDir, "config.json")
+
+	data, err := json.MarshalIndent(cfg, "", "    ")
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(configPath, data, 0644)
+}
+
+func UpdateConfig(key string, value string) error {
+	cfg, err := LoadConfig()
+	if err != nil {
+		return fmt.Errorf("加载配置文件失败: %v", err)
+	}
+
+	switch key {
+	case "TargetIP":
+		if net.ParseIP(value) == nil {
+			return fmt.Errorf("非法 IP 地址: %s", value)
+		}
+		cfg.TargetIP = value
+	case "MonitorWindowSeconds":
+		val, err := strconv.Atoi(value)
+		if err != nil || val <= 0 {
+			return fmt.Errorf("非法输入: MonitorWindowSeconds 必须为正整数")
+		}
+		cfg.MonitorWindowSeconds = val
+	case "ShutdownCountdown":
+		val, err := strconv.Atoi(value)
+		if err != nil || val <= 0 {
+			return fmt.Errorf("非法输入: ShutdownCountdown 必须为正整数")
+		}
+		cfg.ShutdownCountdown = val
+	case "NormalPingInterval":
+		val, err := strconv.Atoi(value)
+		if err != nil || val <= 0 {
+			return fmt.Errorf("非法输入: NormalPingInterval 必须为正整数")
+		}
+		cfg.NormalPingInterval = val
+	default:
+		return fmt.Errorf("未知配置项: %s (开放编辑项: TargetIP, MonitorWindowSeconds, ShutdownCountdown, NormalPingInterval)", key)
+	}
+
+	return SaveConfig(cfg)
+}