Moved go files to src/ folder

src/memory.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Memory struct {
+	MemTotal     int
+	MemFree      int
+	MemAvailable int
+}
+
+func GetMemoryInfo() *Memory {
+	toInt := func(raw string) int {
+		if raw == "" {
+			return 0
+		}
+		res, err := strconv.Atoi(raw)
+		if err != nil {
+			panic(err)
+		}
+		return res
+	}
+
+	parseLine := func(raw string) (key string, value int) {
+		text := strings.ReplaceAll(raw[:len(raw)-2], " ", "")
+		keyValue := strings.Split(text, ":")
+		return keyValue[0], toInt(keyValue[1])
+	}
+
+	if _, err := os.Stat("/proc/meminfo"); err != nil {
+		return nil
+	}
+	file, err := os.Open("/proc/meminfo")
+	if err != nil {
+		panic(err)
+	}
+	defer file.Close()
+	bufio.NewScanner(file)
+	scanner := bufio.NewScanner(file)
+	res := Memory{}
+	for scanner.Scan() {
+		key, value := parseLine(scanner.Text())
+		switch key {
+		case "MemTotal":
+			res.MemTotal = value / 1024
+		case "MemFree":
+			res.MemFree = value / 1024
+		case "MemAvailable":
+			res.MemAvailable = value / 1024
+		}
+	}
+	return &res
+}