forked from arangodb/kube-arangodb
/
taglist.go
76 lines (64 loc) · 1.8 KB
/
taglist.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
// Copyright (c) 2016 Pulcy.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package git
import (
"strings"
"github.com/coreos/go-semver/semver"
)
type TagList []string
// Gets the length of the list
func (this TagList) Len() int {
return len(this)
}
// Swap elements at position i and j
func (this TagList) Swap(i, j int) {
this[i], this[j] = this[j], this[i]
}
// Is element at i less than element at j?
func (this TagList) Less(i, j int) bool {
iv := parseTag(this[i])
jv := parseTag(this[j])
if (iv == nil) && (jv == nil) {
// Both non valid
return false
}
if (iv != nil) && (jv == nil) {
// this[i] is a valid, comes before non valid
return true
}
if (iv == nil) && (jv != nil) {
// this[i] is a nonvalid, comes after valid
return false
}
// Sort valid versions from high to low
return jv.LessThan(*iv)
}
// Try to parse a tag into a version.
// Returns nil when the tag cannot be parsed into a valid semver version.
func parseTag(tag string) *semver.Version {
if strings.HasPrefix(tag, "v") {
// Strip v prefix
tag = tag[1:]
}
if strings.HasSuffix(tag, "^{}") {
// Strip ^{} suffix (apparently added in some case by either builder of gitlab)
// This is not considered a valid version
return nil
}
v, err := semver.NewVersion(tag)
if err != nil {
return nil
}
return v
}