command: "terraform workspace show" to print current workspace name

command/env_show.go

@@ -0,0 +1,42 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+)
+
+type EnvShowCommand struct {
+	Meta
+}
+
+func (c *EnvShowCommand) Run(args []string) int {
+	args = c.Meta.process(args, true)
+
+	cmdFlags := c.Meta.flagSet("env show")
+	cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
+	if err := cmdFlags.Parse(args); err != nil {
+		return 1
+	}
+
+	env := c.Env()
+	c.Ui.Output(
+		c.Colorize().Color(
+			fmt.Sprintf(env),
+		),
+	)
+
+	return 1
+}
+
+func (c *EnvShowCommand) Help() string {
+	helpText := `
+Usage: terraform env show
+
+  Show current Terraform environment.
+`
+	return strings.TrimSpace(helpText)
+}
+
+func (c *EnvShowCommand) Synopsis() string {
+	return "Show current Terraform environment"
+}

command/workspace_command.go

@@ -35,6 +35,7 @@ Usage: terraform workspace
 
 Subcommands:
 
+    show      Show the current workspace name.
     list      List workspaces.
     select    Select a workspace.
     new       Create a new workspace.

commands.go

@@ -78,6 +78,12 @@ func init() {
 			}, nil
 		},
 
+		"env show": func() (cli.Command, error) {
+			return &command.EnvShowCommand{
+				Meta: meta,
+			}, nil
+		},
+
 		"env list": func() (cli.Command, error) {
 			return &command.WorkspaceListCommand{
 				Meta:       meta,