init

.gitignore

@@ -14,4 +14,5 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
-
+.vscode/
+version

go.mod

@@ -0,0 +1,3 @@
+module myschools.me/suguo/version
+
+go 1.19

main.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/user"
+	"strconv"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		return
+	}
+
+	u, err := user.Current()
+	if err != nil {
+		fmt.Print("none")
+		return
+	}
+	dir := fmt.Sprintf("%s/.version", u.HomeDir)
+	if err := os.MkdirAll(dir, os.ModePerm); err != nil {
+		fmt.Print("none")
+		return
+	}
+	fname := fmt.Sprintf(`%s/%s`, dir, os.Args[1])
+	v, err := versionGet(&fname)
+	if err != nil {
+		fmt.Print("none")
+	}
+	versionSet(&fname, v)
+	fmt.Print(v)
+}
+
+func versionGet(fname *string) (v uint64, err error) {
+	f, err := os.OpenFile(*fname, os.O_RDONLY|os.O_CREATE, 0600)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+
+	b, err := ioutil.ReadAll(f)
+	if err != nil {
+		return
+	}
+
+	v, _ = strconv.ParseUint(string(b), 10, 64)
+	v++
+	return
+}
+
+func versionSet(fname *string, v uint64) error {
+	f, err := os.OpenFile(*fname, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	buf := strconv.FormatUint(v, 10)
+	if _, err := f.WriteString(buf); err != nil {
+		return err
+	}
+
+	return nil
+}