Show nicer error when version does not exist

pkg/helpers/helper.go

@@ -24,6 +24,10 @@ func ColoredInstallHelper(version string) string {
 	return color.CyanString(fmt.Sprintf("`tfversion install %s`", version))
 }
 
+func ColoredListHelper() string {
+	return color.CyanString("`tfversion list`")
+}
+
 // ExitWithError prints an error message and exits with status code 1
 func ExitWithError(message string, err error) {
 	fmt.Printf("%s %s: %s\n", color.HiRedString("error:"), message, err)

pkg/install/install.go

@@ -3,6 +3,7 @@ package install
 import (
 	"fmt"
 	"runtime"
+	"slices"
 
 	"github.com/tfversion/tfversion/pkg/download"
 	"github.com/tfversion/tfversion/pkg/helpers"
@@ -16,6 +17,13 @@ func InstallVersion(version string) {
 		helpers.ExitWithError("installing", err)
 	}
 
+	// Check if the version exists
+	availableVersions := list.GetAvailableVersions()
+	if !slices.Contains(availableVersions, version) {
+		err := fmt.Errorf("terraform version %s does not exist, please run %s to check available versions", helpers.ColoredVersion(version), helpers.ColoredListHelper())
+		helpers.ExitWithError("installing", err)
+	}
+
 	// Download the Terraform release
 	zipFile, err := download.Download(version, runtime.GOOS, runtime.GOARCH)
 	if err != nil {