Also implement --required for the command

cmd/use.go

@@ -19,7 +19,11 @@ const (
 		"\n" +
 		"\n" +
 		"# Use the latest pre-release Terraform version\n" +
-		"tfversion use --latest --pre-release"
+		"tfversion use --latest --pre-release\n" +
+		"\n" +
+		"\n" +
+		"# Use the required Terraform version for your current directory\n" +
+		"tfversion use --required"
 )
 
 var (
@@ -33,21 +37,36 @@ var (
 			}
 		},
 		Run: func(cmd *cobra.Command, args []string) {
+
+			// use latest version
 			if latest {
 				if len(args) != 0 {
 					fmt.Println("error: `--latest` flag does not require specifying a Terraform version")
 					fmt.Printf("See %s for help and examples\n", color.BlueString("`tfversion install -h`"))
 					os.Exit(1)
 				}
-				use.UseVersion("", latest, preRelease)
-			} else {
-				if len(args) != 1 {
-					fmt.Println("error: provide a Terraform version to activate")
+				use.UseLatestVersion(preRelease)
+				os.Exit(0)
+			}
+
+			// use required version
+			if required {
+				if len(args) != 0 {
+					fmt.Println("error: `--required` flag does not require specifying a Terraform version")
 					fmt.Printf("See %s for help and examples\n", color.BlueString("`tfversion install -h`"))
 					os.Exit(1)
 				}
-				use.UseVersion(args[0], latest, preRelease)
+				use.UseRequiredVersion()
+				os.Exit(0)
+			}
+
+			// use specific version
+			if len(args) != 1 {
+				fmt.Println("error: provide a Terraform version to activate")
+				fmt.Printf("See %s for help and examples\n", color.BlueString("`tfversion install -h`"))
+				os.Exit(1)
 			}
+			use.UseVersion(args[0])
 		},
 	}
 )
@@ -56,4 +75,5 @@ func init() {
 	rootCmd.AddCommand(useCmd)
 	useCmd.Flags().BoolVar(&latest, "latest", false, "use the latest stable Terraform version")
 	useCmd.Flags().BoolVar(&preRelease, "pre-release", false, "When used with --latest, use the latest pre-release version")
+	useCmd.Flags().BoolVar(&required, "required", false, "use the required Terraform version for your current directory")
 }

pkg/use/use.go

@@ -13,22 +13,7 @@ import (
 )
 
 // UseVersion activates the specified Terraform version or one of the latest versions
-func UseVersion(version string, latest bool, preRelease bool) {
-	// Get the available Terraform versions
-	versions := list.GetAvailableVersions()
-
-	// Set the version to the latest stable version if the `latest` flag is set
-	// or to the latest pre-release version if the `latest` and `pre-release` flags are set
-	if latest {
-		for _, v := range versions {
-			if !preRelease && helpers.IsPreReleaseVersion(v) {
-				continue
-			}
-			version = v
-			break
-		}
-	}
-
+func UseVersion(version string) {
 	if !download.IsAlreadyDownloaded(version) {
 		if helpers.IsPreReleaseVersion(version) {
 			fmt.Printf("Terraform version %s not found, run %s to install\n", color.YellowString(version), color.BlueString(fmt.Sprintf("`tfversion install %s`", version)))
@@ -83,3 +68,23 @@ func UseVersion(version string, latest bool, preRelease bool) {
 		fmt.Printf("Activated Terraform version %s\n", color.BlueString(version))
 	}
 }
+
+func UseLatestVersion(preRelease bool) {
+	version := list.FindLatestVersion(preRelease)
+	UseVersion(version)
+}
+
+func UseRequiredVersion() {
+	terraformFiles := helpers.FindTerraformFiles()
+	if len(terraformFiles) == 0 {
+		fmt.Println("No Terraform files found in current directory")
+		os.Exit(1)
+	}
+	for _, file := range terraformFiles {
+		requiredVersion := helpers.FindRequiredVersionInFile(file)
+		if requiredVersion != "" {
+			UseVersion(requiredVersion)
+			break
+		}
+	}
+}