feat: add settings pages

internal/constant/sentence.go

@@ -0,0 +1,68 @@
+package constant
+
+import (
+	"bufio"
+	"encoding/json"
+	"math/rand"
+	"os"
+	"sync"
+)
+
+type Sentence struct {
+	Name string `json:"name"`
+	From string `json:"from"`
+}
+
+const sentenceFile = "internal/constant/sentence1-10000.json"
+
+var (
+	lineCount     int
+	lineCountOnce sync.Once
+)
+
+// countLines 统计文件行数（只执行一次）
+func countLines() {
+	lineCountOnce.Do(func() {
+		file, err := os.Open(sentenceFile)
+		if err != nil {
+			return
+		}
+		defer file.Close()
+
+		scanner := bufio.NewScanner(file)
+		for scanner.Scan() {
+			lineCount++
+		}
+	})
+}
+
+// GetRandomSentence 随机获取一条古诗词
+func GetRandomSentence() string {
+	countLines()
+	if lineCount == 0 {
+		return "欢迎使用白虎面板"
+	}
+
+	targetLine := rand.Intn(lineCount)
+
+	file, err := os.Open(sentenceFile)
+	if err != nil {
+		return "欢迎使用白虎面板"
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	currentLine := 0
+	for scanner.Scan() {
+		if currentLine == targetLine {
+			var s Sentence
+			if err := json.Unmarshal(scanner.Bytes(), &s); err == nil && s.Name != "" {
+				return s.Name
+			}
+			break
+		}
+		currentLine++
+	}
+
+	return "欢迎使用白虎面板"
+}