-
Notifications
You must be signed in to change notification settings - Fork 7
/
latest.go
73 lines (68 loc) · 1.44 KB
/
latest.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
package latest
import (
"errors"
"fmt"
"net/http"
"github.com/andybalholm/cascadia"
"golang.org/x/mod/semver"
"golang.org/x/net/html"
)
// Version returns the latest version of the modpath
func Version(modpath string) (string, error) {
vv, err := Versions(modpath)
if err != nil {
return "", err
}
var newest string
for _, s := range vv {
if !semver.IsValid(s) {
continue
}
if newest == "" {
newest = s
}
if semver.Compare(s, newest) > 0 {
newest = s
}
}
if newest == "" {
return "", errors.New("no valid versions")
}
return newest, nil
}
// get all the versions for a module
func Versions(modpath string) ([]string, error) {
url := fmt.Sprintf("https://pkg.go.dev/%s?tab=versions", modpath)
res, err := http.Get(url)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return nil, errors.New(res.Status)
}
// extract versions from the html
var versions []string
doc, err := html.Parse(res.Body)
if err != nil {
return nil, err
}
sel := cascadia.MustCompile(".Versions-item>a")
for _, node := range cascadia.QueryAll(doc, sel) {
walk(node, func(n *html.Node) {
if n.Type == html.TextNode {
versions = append(versions, n.Data)
}
})
}
return versions, nil
}
// walk the node using depth first
func walk(n *html.Node, f func(*html.Node)) {
f(n)
if n.FirstChild != nil {
for c := n.FirstChild; c != nil; c = c.NextSibling {
walk(c, f)
}
}
}