feat(cli): add formatting options to coder whoami (#19970)

This addresses a long-standing gripe of mine: to get your logged in
username you would have to do
```bash
coder whoami | awk '{print $9}'
```

This allows you to do:

```
coder whoami -o json | jq -r '.username'
```

or

```
coder whoami -f table -c username
```

cli/testdata/coder_whoami_--help.golden

@@ -1,9 +1,16 @@
 coder v0.0.0-devel
 
 USAGE:
-  coder whoami
+  coder whoami [flags]
 
   Fetch authenticated user info for Coder deployment
 
+OPTIONS:
+  -c, --column [URL|Username] (default: url,username)
+          Columns to display in table output.
+
+  -o, --output text|json|table (default: text)
+          Output format.
+
 ———
 Run `coder --help` for a list of global options.

cli/whoami.go

@@ -9,7 +9,25 @@ import (
 	"github.com/coder/serpent"
 )
 
+type whoamiRow struct {
+	URL      string `json:"url" table:"URL,default_sort"`
+	Username string `json:"username" table:"Username"`
+}
+
+func (r whoamiRow) String() string {
+	return fmt.Sprintf(
+		Caret+"Coder is running at %s, You're authenticated as %s !\n",
+		pretty.Sprint(cliui.DefaultStyles.Keyword, r.URL),
+		pretty.Sprint(cliui.DefaultStyles.Keyword, r.Username),
+	)
+}
+
 func (r *RootCmd) whoami() *serpent.Command {
+	formatter := cliui.NewOutputFormatter(
+		cliui.TextFormat(),
+		cliui.JSONFormat(),
+		cliui.TableFormat([]whoamiRow{}, []string{"url", "username"}),
+	)
 	cmd := &serpent.Command{
 		Annotations: workspaceCommand,
 		Use:         "whoami",
@@ -28,14 +46,23 @@ func (r *RootCmd) whoami() *serpent.Command {
 			resp, err := client.User(ctx, codersdk.Me)
 			// Get Coder instance url
 			clientURL := client.URL
-
 			if err != nil {
 				return err
 			}
 
-			_, _ = fmt.Fprintf(inv.Stdout, Caret+"Coder is running at %s, You're authenticated as %s !\n", pretty.Sprint(cliui.DefaultStyles.Keyword, clientURL), pretty.Sprint(cliui.DefaultStyles.Keyword, resp.Username))
+			out, err := formatter.Format(ctx, []whoamiRow{
+				{
+					URL:      clientURL.String(),
+					Username: resp.Username,
+				},
+			})
+			if err != nil {
+				return err
+			}
+			_, err = inv.Stdout.Write([]byte(out))
 			return err
 		},
 	}
+	formatter.AttachOptions(&cmd.Options)
 	return cmd
 }

docs/reference/cli/whoami.md

@@ -6,5 +6,25 @@ Fetch authenticated user info for Coder deployment
 ## Usage
 
 ```console
-coder whoami
+coder whoami [flags]
 ```
+
+## Options
+
+### -c, --column
+
+|         |                              |
+|---------|------------------------------|
+| Type    | <code>[URL\|Username]</code> |
+| Default | <code>url,username</code>    |
+
+Columns to display in table output.
+
+### -o, --output
+
+|         |                                |
+|---------|--------------------------------|
+| Type    | <code>text\|json\|table</code> |
+| Default | <code>text</code>              |
+
+Output format.