first version

constant/constant.go

@@ -0,0 +1,65 @@
+package constant
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type (
+	Version struct {
+		patch int
+		minor int
+		major int
+	}
+)
+
+var (
+	patch string = "0"
+	minor string = "0"
+	major string = "0"
+
+	version Version
+)
+
+func init() {
+	patchInt, err := strconv.Atoi(patch)
+	if err != nil {
+		panic(fmt.Errorf("failed to parse version number, this is a compilation error, try recompile the program"))
+	}
+
+	minorInt, err := strconv.Atoi(minor)
+	if err != nil {
+		panic(fmt.Errorf("failed to parse version number, this is a compilation error, try recompile the program"))
+	}
+
+	majorInt, err := strconv.Atoi(major)
+	if err != nil {
+		panic(fmt.Errorf("failed to parse version number, this is a compilation error, try recompile the program"))
+	}
+
+	version = Version{
+		patch: patchInt,
+		minor: minorInt,
+		major: majorInt,
+	}
+}
+
+func ProgramVersion() Version {
+	return version
+}
+
+func (v Version) Patch() int {
+	return v.patch
+}
+
+func (v Version) Minor() int {
+	return v.minor
+}
+
+func (v Version) Major() int {
+	return v.major
+}
+
+func (v Version) String() string {
+	return fmt.Sprintf("%d.%d.%d", v.major, v.minor, v.patch)
+}