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version.go
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version.go
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// used for version parsing, printing, and comparison
package main
import (
"fmt"
)
type GochanVersion struct {
Major int
Minor int
Revision int
Extra string
}
func ParseVersion(vStr string) GochanVersion {
var v GochanVersion
fmt.Sscanf(vStr, "%d.%d.%d-%s", &v.Major, &v.Minor, &v.Revision, &v.Extra)
v.Normalize()
return v
}
func (v *GochanVersion) Normalize() bool {
valid := true
if v.Major < 0 {
v.Major = 0
valid = false
}
if v.Minor < 0 {
v.Minor = 0
valid = false
}
if v.Revision < 0 {
v.Revision = 0
}
return valid
}
func (v *GochanVersion) Compare(v2 GochanVersion) int {
v.Normalize()
v2.Normalize()
if v.Major > v2.Major {
return 1
}
if v.Major < v2.Major {
return -1
}
if v.Minor > v2.Minor {
return 1
}
if v.Minor < v2.Minor {
return -1
}
if v.Revision > v2.Revision {
return 1
}
if v.Revision < v2.Revision {
return -1
}
return 0
}
func (v *GochanVersion) CompareString(v2str string) int {
v.Normalize()
v2 := ParseVersion(v2str)
v2.Normalize()
return v.Compare(v2)
}
func (v *GochanVersion) String() string {
v.Normalize()
str := fmt.Sprintf("%d.%d", v.Major, v.Minor)
if v.Revision > 0 {
str += fmt.Sprintf(".%d", v.Revision)
}
if v.Extra != "" {
str += "-" + v.Extra
}
return str
}