Warn on new version

Author: juho05

external/cg_gen_events.go

@@ -2,6 +2,7 @@ package external
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"os"
@@ -18,7 +19,7 @@ var cgGenEventsPath = filepath.Join(xdg.DataHome, "codegame", "bin", "cg-gen-eve
 func LatestGithubTag(owner, repo string) (string, error) {
 	res, err := http.Get(fmt.Sprintf("https://api.github.com/repos/%s/%s/tags", owner, repo))
 	if err != nil || res.StatusCode != http.StatusOK || !HasContentType(res.Header, "application/json") {
-		return "", cli.Error("Couldn't access git tags from 'github.com/%s/%s'.", owner, repo)
+		return "", fmt.Errorf("failed to access git tags from 'github.com/%s/%s'.", owner, repo)
 	}
 	defer res.Body.Close()
 	type response []struct {
@@ -27,15 +28,15 @@ func LatestGithubTag(owner, repo string) (string, error) {
 	var data response
 	err = json.NewDecoder(res.Body).Decode(&data)
 	if err != nil {
-		return "", cli.Error("Couldn't decode git tag data.")
+		return "", errors.New("failed to decode git tag data.")
 	}
 	return data[0].Name, nil
 }
 
 func LatestCGEVersion() (string, error) {
 	tag, err := LatestGithubTag("code-game-project", "cg-gen-events")
 	if err != nil {
-		return "", err
+		return "", cli.Error("Couldn't determine the latest CGE version: %s", err)
 	}
 
 	return strings.TrimPrefix(strings.Join(strings.Split(tag, ".")[:2], "."), "v"), nil

external/version.go

@@ -0,0 +1,49 @@
+package external
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/adrg/xdg"
+	"github.com/code-game-project/codegame-cli/cli"
+)
+
+const currentVersion = "0.4.1"
+
+func CheckVersion() {
+	latest, err := getLatestVersion()
+	if err != nil {
+		return
+	}
+	if currentVersion != latest {
+		cli.Warn("You are using an old version of codegame-cli (v%s).\nUpdate to the latest version (v%s): https://github.com/code-game-project/codegame-cli#installation", currentVersion, latest)
+	}
+}
+
+func getLatestVersion() (string, error) {
+	cacheDir := filepath.Join(xdg.CacheHome, "codegame", "cli")
+	os.MkdirAll(cacheDir, 0755)
+
+	content, err := os.ReadFile(filepath.Join(cacheDir, "latest_version"))
+	if err == nil {
+		parts := strings.Split(string(content), "\n")
+		if len(parts) >= 2 {
+			cacheTime, err := strconv.Atoi(parts[0])
+			if err == nil && time.Now().Unix()-int64(cacheTime) <= 3*24*60*60 {
+				return parts[1], nil
+			}
+		}
+	}
+
+	tag, err := LatestGithubTag("code-game-project", "codegame-cli")
+	if err != nil {
+		return "", err
+	}
+	version := strings.TrimPrefix(tag, "v")
+	os.WriteFile(filepath.Join(cacheDir, "latest_version"), []byte(fmt.Sprintf("%d\n%s", time.Now().Unix(), version)), 0644)
+	return version, nil
+}

main.go

@@ -30,6 +30,8 @@ func main() {
 		os.Exit(1)
 	}
 
+	external.CheckVersion()
+
 	command := strings.ToLower(pflag.Arg(0))
 
 	var err error