From 31ca9ffe7b1d51ebdee4e308813ee4261c4c7e32 Mon Sep 17 00:00:00 2001
From: Ole Magnus Fon Johnsen <me@omfj.no>
Date: Sun, 24 Nov 2024 21:43:00 +0100
Subject: [PATCH] Check if cnev is running latest version

---
 .github/workflows/build.yaml |  1 +
 README.md                    | 13 ++++++++++
 cmd/cmd.go                   | 47 ++++++++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index a4b0af5..4c2fd00 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -29,4 +29,5 @@ jobs:
           goarch: ${{ matrix.goarch }}
           multi_binaries: true
           binary_name: cenv
+          ldflags: -X main.Version=${{ github.event.release.tag_name }}
           project_path: . ./cenv-install
diff --git a/README.md b/README.md
index 8f50a43..e3ebff4 100644
--- a/README.md
+++ b/README.md
@@ -67,3 +67,16 @@ You can fix and outdated .env with the fix command. Note that this will overwrit
 cenv fix
 ```
 
+## Building
+
+To build the project, you need to have Go installed. Run the following command to build the project:
+
+```sh
+go build -o cenv cmd/cenv/main.go
+```
+
+If you want to overwrite the `Version` variable in `main.go` you have add the following flags:
+
+```sh
+go build -o cenv -ldflags "-X main.Version=<your-version>" cmd/cenv/main.go
+```
diff --git a/cmd/cmd.go b/cmd/cmd.go
index 77ee454..fa1d8df 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -1,14 +1,19 @@
 package cmd
 
 import (
+	"encoding/json"
 	"fmt"
+	"net/http"
 	"os"
 	"os/exec"
+	"strings"
 
 	"github.com/echo-webkom/cenv/cenv"
 	"github.com/fatih/color"
 )
 
+var Version = "dev"
+
 func showHelp() {
 	fmt.Println("cenv [command] <args>")
 	fmt.Println()
@@ -23,6 +28,7 @@ func showHelp() {
 	fmt.Println("Flags:")
 	fmt.Println("    --env <path>      Path to env file, default is current dir")
 	fmt.Println("    --schema <path>   Path to schema file, default is current dir")
+	fmt.Println("    --skip-version    Skip version check")
 	fmt.Println()
 }
 
@@ -36,7 +42,48 @@ func errorExit(err error) {
 	os.Exit(1)
 }
 
+func checkIfLatestVersion() {
+	if Version == "dev" {
+		return
+	}
+
+	for _, arg := range os.Args {
+		if arg == "--skip-version" {
+			return
+		}
+	}
+
+	resp, err := http.Get("https://api.github.com/repos/echo-webkom/cenv/releases/latest")
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return
+	}
+
+	var result struct {
+		TagName string `json:"tag_name"`
+	}
+	err = json.NewDecoder(resp.Body).Decode(&result)
+	if err != nil {
+		return
+	}
+
+	latestVersion := strings.TrimSpace(result.TagName)
+	currentVersion := strings.TrimSpace(Version)
+
+	isLatest := currentVersion == latestVersion
+
+	if !isLatest {
+		color.Yellow("A new version of cenv is available. Run 'cenv upgrade' to upgrade.")
+	}
+}
+
 func Run() {
+	checkIfLatestVersion()
+
 	if len(os.Args) < 2 {
 		showHelp()
 		os.Exit(1)