Add state yml

update/update.go

@@ -2,32 +2,111 @@ package update
 
 import (
 	"fmt"
+	"io/ioutil"
+	"time"
 
 	"github.com/github/gh-cli/api"
 	"github.com/hashicorp/go-version"
+	"github.com/mitchellh/go-homedir"
+	"gopkg.in/yaml.v3"
 )
 
 // ReleaseInfo stores information about a release
 type ReleaseInfo struct {
-	Version string `json:"tag_name"`
-	URL     string `json:"html_url"`
+	Version string
+	URL     string
+}
+
+type StateEntry struct {
+	CheckedForUpdateAt time.Time   `yaml:"checked_for_update_at"`
+	LatestRelease      ReleaseInfo `yaml:"latest_release"`
 }
 
 // CheckForUpdate checks whether this software has had a newer relase on GitHub
 func CheckForUpdate(client *api.Client, repo, currentVersion string) (*ReleaseInfo, error) {
-	latestRelease := ReleaseInfo{}
-	err := client.REST("GET", fmt.Sprintf("repos/%s/releases/latest", repo), nil, &latestRelease)
+	latestRelease, err := getLatestReleaseInfo(client, repo, currentVersion)
 	if err != nil {
 		return nil, err
 	}
 
 	if versionGreaterThan(latestRelease.Version, currentVersion) {
-		return &latestRelease, nil
+		return latestRelease, nil
 	}
 
 	return nil, nil
 }
 
+func getLatestReleaseInfo(client *api.Client, repo, currentVersion string) (*ReleaseInfo, error) {
+	stateEntry, err := getStateEntry()
+	if err != nil {
+		return nil, err
+	}
+
+	checkedRecently := time.Since(stateEntry.CheckedForUpdateAt).Hours() < 24
+	if checkedRecently {
+		return &stateEntry.LatestRelease, nil
+	}
+
+	latestRelease := ReleaseInfo{}
+	err = client.REST("GET", fmt.Sprintf("repos/%s/releases/latest", repo), nil, &latestRelease)
+	if err != nil {
+		return nil, err
+	}
+
+	err = setStateEntry(time.Now(), latestRelease)
+	if err != nil {
+		return nil, err
+	}
+
+	return &latestRelease, nil
+}
+
+func stateFileName() string {
+	f, _ := homedir.Expand("~/.config/gh/state.yml")
+	return f
+}
+
+func getStateEntry() (*StateEntry, error) {
+	f := stateFileName()
+	content, err := ioutil.ReadFile(f)
+	if err != nil {
+		data := StateEntry{
+			CheckedForUpdateAt: time.Now(),
+			LatestRelease: ReleaseInfo{
+				Version: "v0.0.0",
+				URL:     "<?>",
+			},
+		}
+		content, err = yaml.Marshal(data)
+		if err != nil {
+			return nil, err
+		}
+		ioutil.WriteFile(f, content, 0600)
+	}
+
+	var stateEntry StateEntry
+	err = yaml.Unmarshal(content, &stateEntry)
+	if err != nil {
+		return nil, err
+	}
+
+	return &stateEntry, nil
+}
+
+func setStateEntry(t time.Time, r ReleaseInfo) error {
+	data := StateEntry{
+		CheckedForUpdateAt: t,
+		LatestRelease:      r,
+	}
+	content, err := yaml.Marshal(data)
+	if err != nil {
+		return err
+	}
+	ioutil.WriteFile(stateFileName(), content, 0600)
+
+	return nil
+}
+
 func versionGreaterThan(v, w string) bool {
 	vv, ve := version.NewVersion(v)
 	vw, we := version.NewVersion(w)