1package update
2
3import (
4 "context"
5 "encoding/json"
6 "fmt"
7 "io"
8 "net/http"
9 "regexp"
10 "strings"
11 "time"
12)
13
14const (
15 githubApiUrl = "https://api.github.com/repos/charmbracelet/crush/releases/latest"
16 userAgent = "crush/1.0"
17)
18
19// Default is the default [Client].
20var Default Client = &github{}
21
22// Info contains information about an available update.
23type Info struct {
24 Current string
25 Latest string
26 URL string
27}
28
29// Matches a version string like:
30// v0.0.0-0.20251231235959-06c807842604
31var goInstallRegexp = regexp.MustCompile(`^v?\d+\.\d+\.\d+-\d+\.\d{14}-[0-9a-f]{12}$`)
32
33func (i Info) IsDevelopment() bool {
34 return i.Current == "devel" || i.Current == "unknown" || strings.Contains(i.Current, "dirty") || goInstallRegexp.MatchString(i.Current)
35}
36
37// Available returns true if there's an update available.
38//
39// Returns true if the current and latest versions are different, treating
40// pre-releases as valid latest versions.
41func (i Info) Available() bool {
42 return i.Current != i.Latest
43}
44
45// Check checks if a new version is available.
46func Check(ctx context.Context, current string, client Client) (Info, error) {
47 info := Info{
48 Current: current,
49 Latest: current,
50 }
51
52 release, err := client.Latest(ctx)
53 if err != nil {
54 return info, fmt.Errorf("failed to fetch latest release: %w", err)
55 }
56
57 info.Latest = strings.TrimPrefix(release.TagName, "v")
58 info.Current = strings.TrimPrefix(info.Current, "v")
59 info.URL = release.HTMLURL
60 return info, nil
61}
62
63// Release represents a GitHub release.
64type Release struct {
65 TagName string `json:"tag_name"`
66 HTMLURL string `json:"html_url"`
67}
68
69// Client is a client that can get the latest release.
70type Client interface {
71 Latest(ctx context.Context) (*Release, error)
72}
73
74type github struct{}
75
76// Latest implements [Client].
77func (c *github) Latest(ctx context.Context) (*Release, error) {
78 client := &http.Client{
79 Timeout: 30 * time.Second,
80 }
81
82 req, err := http.NewRequestWithContext(ctx, "GET", githubApiUrl, nil)
83 if err != nil {
84 return nil, err
85 }
86 req.Header.Set("User-Agent", userAgent)
87 req.Header.Set("Accept", "application/vnd.github.v3+json")
88
89 resp, err := client.Do(req)
90 if err != nil {
91 return nil, err
92 }
93 defer resp.Body.Close()
94
95 if resp.StatusCode != http.StatusOK {
96 body, _ := io.ReadAll(resp.Body)
97 return nil, fmt.Errorf("github api returned status %d: %s", resp.StatusCode, string(body))
98 }
99
100 var release Release
101 if err := json.NewDecoder(resp.Body).Decode(&release); err != nil {
102 return nil, err
103 }
104
105 return &release, nil
106}