update checker

core/model/application.go

@@ -0,0 +1,35 @@
+package model
+
+import "fmt"
+
+type VersionInfo struct {
+	Version Version
+	Info    string
+}
+
+type Version uint32
+
+func (v Version) String() string {
+	return fmt.Sprintf("%d.%d.%d", (v>>16)&0xff, (v>>8)&0xff, v&0xff)
+}
+
+func (v Version) Major() uint8 {
+	return uint8((v >> 16) & 0xff)
+}
+
+func (v Version) Minor() uint8 {
+	return uint8((v >> 8) & 0xff)
+}
+
+func (v Version) Patch() uint8 {
+	return uint8(v & 0xff)
+}
+
+func VersionFromString(s string) Version {
+	var major, minor, patch uint8
+	_, err := fmt.Sscanf(s, "%d.%d.%d", &major, &minor, &patch)
+	if err != nil {
+		return 0
+	}
+	return Version(major)<<16 | Version(minor)<<8 | Version(patch)
+}