'gowrap project version' implemented

cmd/gowrap/commands/project.go

@@ -1,18 +1,22 @@
 package commands
 
 import (
+	"fmt"
 	"strings"
 
+	"github.com/xabierlaiseca/gowrap/pkg/versions"
+
 	"github.com/alecthomas/kingpin"
 	"github.com/xabierlaiseca/gowrap/pkg/project"
 	"github.com/xabierlaiseca/gowrap/pkg/semver"
 	"github.com/xabierlaiseca/gowrap/pkg/util/customerrors"
 )
 
-func newProjectCommand(app *kingpin.Application, wd string) {
+func newProjectCommand(app *kingpin.Application, gowrapHome, wd string) {
 	cmd := app.Command("project", "Project operations")
 	newProjectPinCommand(cmd, wd)
 	newProjectUnpinCommand(cmd, wd)
+	newProjectVersionCommand(cmd, gowrapHome, wd)
 }
 
 func newProjectPinCommand(parent *kingpin.CmdClause, wd string) {
@@ -40,3 +44,27 @@ func newProjectUnpinCommand(parent *kingpin.CmdClause, wd string) {
 			return project.UnpinVersion(wd)
 		})
 }
+
+func newProjectVersionCommand(parent *kingpin.CmdClause, gowrapHome, wd string) {
+	parent.Command("version", "Show the Go version used by the project").
+		Action(func(*kingpin.ParseContext) error {
+			projectVersion, err := project.DetectVersion(gowrapHome, wd)
+			if err != nil {
+				return err
+			}
+
+			var additionalMessage string
+			installedVersion, err := versions.FindLatestInstalledForPrefix(gowrapHome, projectVersion)
+			switch {
+			case customerrors.IsNotFound(err):
+				additionalMessage = " (no compatible installed version found)"
+			case err != nil:
+				return err
+			case projectVersion != installedVersion:
+				additionalMessage = fmt.Sprintf(" (specific version to use: %s)", installedVersion)
+			}
+
+			fmt.Printf("%s%s\n", projectVersion, additionalMessage)
+			return nil
+		})
+}

cmd/gowrap/commands/run.go

@@ -8,7 +8,7 @@ func RunCli(gowrapHome, wd string, args []string) error {
 	newConfigureCommand(app, gowrapHome)
 	newInstallCommand(app, gowrapHome)
 	newListCommand(app, gowrapHome)
-	newProjectCommand(app, wd)
+	newProjectCommand(app, gowrapHome, wd)
 	newUninstallCommand(app, gowrapHome)
 	newVersionsFileCommand(app)