fix: check latest version before update

Author: rishabyd

internal/commands/cobra.go

@@ -55,7 +55,7 @@ func newRootCmd(version string) *cobra.Command {
 
 	root.AddCommand(newAuthCmd())
 	root.AddCommand(newRepoCmd())
-	root.AddCommand(newUpdateCmd())
+	root.AddCommand(newUpdateCmd(version))
 
 	root.SetFlagErrorFunc(func(_ *cobra.Command, err error) error {
 		return usageError(err.Error())
@@ -224,25 +224,13 @@ func newRepoCmd() *cobra.Command {
 	return repoCmd
 }
 
-func newUpdateCmd() *cobra.Command {
+func newUpdateCmd(version string) *cobra.Command {
 	return &cobra.Command{
 		Use:   "update",
 		Short: "Update to the latest release",
 		Args:  cobra.NoArgs,
 		RunE: func(cmd *cobra.Command, _ []string) error {
-			fmt.Print("Proceed with update? [Y/n] ")
-			var answer string
-			if _, err := fmt.Scanln(&answer); err != nil {
-				return nil
-			}
-			answer = strings.TrimSpace(strings.ToLower(answer))
-			if answer != "" && answer != "y" && answer != "yes" {
-				fmt.Println("To update manually, run:")
-				fmt.Println("  curl -fsSL https://raw.githubusercontent.com/rishabyd/codeberg-cli/main/install.sh | bash")
-				return nil
-			}
-
-			return runUpdate()
+			return checkAndUpdate(version)
 		},
 	}
 }

internal/commands/update.go

@@ -1,11 +1,100 @@
 package commands
 
 import (
+	"encoding/json"
+	"fmt"
+	"net/http"
 	"os"
 	"os/exec"
+	"strconv"
+	"strings"
 )
 
-func runUpdate() error {
+const latestReleaseURL = "https://api.github.com/repos/rishabyd/codeberg-cli/releases/latest"
+
+type ghRelease struct {
+	TagName string `json:"tag_name"`
+}
+
+func checkAndUpdate(currentVersion string) error {
+	latest, err := fetchLatestTag()
+	if err != nil {
+		fmt.Println("Could not check for updates. Proceeding...")
+	} else if !isNewer(latest, currentVersion) {
+		fmt.Printf("Already up to date (v%s)\n", currentVersion)
+		return nil
+	} else {
+		fmt.Printf("A new version is available: %s (current: v%s)\n", latest, currentVersion)
+	}
+
+	fmt.Print("Proceed with update? [Y/n] ")
+	var answer string
+	if _, err := fmt.Scanln(&answer); err != nil {
+		return nil
+	}
+	answer = strings.TrimSpace(strings.ToLower(answer))
+	if answer != "" && answer != "y" && answer != "yes" {
+		fmt.Println("To update manually, run:")
+		fmt.Println("  curl -fsSL https://raw.githubusercontent.com/rishabyd/codeberg-cli/main/install.sh | bash")
+		return nil
+	}
+
+	return execUpdate()
+}
+
+func fetchLatestTag() (string, error) {
+	resp, err := http.Get(latestReleaseURL)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("HTTP %d", resp.StatusCode)
+	}
+
+	var release ghRelease
+	if err := json.NewDecoder(resp.Body).Decode(&release); err != nil {
+		return "", err
+	}
+	return release.TagName, nil
+}
+
+func isNewer(latest, current string) bool {
+	l := parseVersion(latest)
+	c := parseVersion(current)
+	if l == nil || c == nil {
+		return true
+	}
+	for i := 0; i < 3; i++ {
+		if l[i] > c[i] {
+			return true
+		}
+		if l[i] < c[i] {
+			return false
+		}
+	}
+	return false
+}
+
+func parseVersion(v string) []int {
+	v = strings.TrimPrefix(v, "v")
+	parts := strings.Split(v, ".")
+	if len(parts) < 3 {
+		return nil
+	}
+	nums := make([]int, 3)
+	for i := 0; i < 3; i++ {
+		n, err := strconv.Atoi(parts[i])
+		if err != nil {
+			return nil
+		}
+		nums[i] = n
+	}
+	return nums
+}
+
+func execUpdate() error {
 	cmd := exec.Command("bash", "-c",
 		"curl -fsSL https://raw.githubusercontent.com/rishabyd/codeberg-cli/main/install.sh | bash")
 	cmd.Stdin = os.Stdin