Show more output on our "versione" sub-command

This is conditional on go 1.18 being present

Author: skx

cmd_version.go

@@ -1,16 +1,16 @@
+//go:build !go1.18
+// +build !go1.18
+
 package main
 
-//go:generate echo Hello, Go Generate!
 import (
 	"fmt"
-	"runtime/debug"
-	"strings"
 
 	"github.com/skx/subcommands"
 )
 
 var (
-	versionString = "unreleased"
+	version = "unreleased"
 )
 
 // Structure for our options and state.
@@ -22,34 +22,18 @@ type versionCommand struct {
 
 // Info returns the name of this subcommand.
 func (t *versionCommand) Info() (string, string) {
-	return "version", `Show the version of the binary.
+	return "version", `Show the version of this binary.
 
 Details:
 
-This reports upon the version of the sysbox application.
-
-Usage:
-
-   $ sysbox version
-
+This reports upon the version of the application.
 `
 }
 
 // Execute is invoked if the user specifies `version` as the subcommand.
 func (t *versionCommand) Execute(args []string) int {
 
-	fmt.Printf("%s\n", versionString)
-
-	// Show VCS information
-	info, ok := debug.ReadBuildInfo()
-
-	if ok {
-		for _, settings := range info.Settings {
-			if strings.Contains(settings.Key, "vcs") {
-				fmt.Printf("%s: %s\n", settings.Key, settings.Value)
-			}
-		}
-	}
+	fmt.Printf("%s\n", version)
 
 	return 0
 }

cmd_version_18.go

@@ -0,0 +1,51 @@
+//go:build go1.18
+// +build go1.18
+
+package main
+
+import (
+	"fmt"
+	"runtime/debug"
+	"strings"
+
+	"github.com/skx/subcommands"
+)
+
+var (
+	version = "unreleased"
+)
+
+// Structure for our options and state.
+type versionCommand struct {
+
+	// We embed the NoFlags option, because we accept no command-line flags.
+	subcommands.NoFlags
+}
+
+// Info returns the name of this subcommand.
+func (t *versionCommand) Info() (string, string) {
+	return "version", `Show the version of this binary.
+
+Details:
+
+This reports upon the version of the application.
+`
+}
+
+// Execute is invoked if the user specifies `version` as the subcommand.
+func (t *versionCommand) Execute(args []string) int {
+
+	fmt.Printf("%s\n", version)
+
+	info, ok := debug.ReadBuildInfo()
+
+	if ok {
+		for _, settings := range info.Settings {
+			if strings.Contains(settings.Key, "vcs") {
+				fmt.Printf("%s: %s\n", settings.Key, settings.Value)
+			}
+		}
+	}
+
+	return 0
+}