/
versions.go
134 lines (107 loc) · 2.2 KB
/
versions.go
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package chopsticks
import (
"io/ioutil"
"sort"
"strings"
)
// LatestVersion get the version from bucket
func LatestVersion(app, bucket string) (string, error) {
mf, err := GetManifest(app, bucket)
if err != nil {
return "", err
}
return mf.Version, nil
}
// LatestVersionFromUrl get the latest version from url
func LatestVersionFromUrl(url string) (string, error) {
mf := GetUrlManifest(url)
return mf.Version, nil
}
// CurrentVersion
func CurrentVersion(app string, isGlobal bool) (string, error) {
v, err := getVersions(app, isGlobal)
if err != nil {
return "", err
}
v = sortVersion(v)
return v[len(v)-1], nil
}
// getVersions return a string array of app's all versions
// exclude the `current` version
func getVersions(app string, isGlobal bool) ([]string, error) {
appdir := appDir(app, isGlobal)
dirs, err := ioutil.ReadDir(appdir)
if err != nil {
return []string{}, err
}
var vs []string
for _, dir := range dirs {
if dir.IsDir() {
vs = append(vs, dir.Name())
}
}
return vs, nil
}
type versions []string
func (v versions) Len() int {
return len(v)
}
func (v versions) Swap(i, j int) {
v[i], v[j] = v[j], v[i]
}
func (v versions) Less(i, j int) bool {
toVersionArray := func(v string) []string {
return strings.FieldsFunc(v, func(r rune) bool {
return r == '.' || r == '-'
})
}
a := toVersionArray(v[i])
b := toVersionArray(v[j])
for i, v := range a {
if i > len(b) {
return false
}
if v > b[i] {
return false
}
if v < b[i] {
return true
}
}
if len(b) > len(a) {
return true
}
return false
}
func sortVersion(vs []string) []string {
sort.Sort(versions(vs))
return vs
}
// compareVersions compare two version string a and b
// if a is newer than b, return 1
// if a is equal to b, return 0
// if a is older than b, return -1
func compareVersions(a, b string) int {
toVersionArray := func(v string) []string {
return strings.FieldsFunc(v, func(r rune) bool {
return r == '.' || r == '-'
})
}
verA := toVersionArray(a)
verB := toVersionArray(b)
for i, v := range verA {
if i > len(b) {
return 1
}
if v > verB[i] {
return 1
}
if v < verB[i] {
return -1
}
}
if len(b) > len(a) {
return -1
}
return 0
}