fix(db): suggest database name for hostname prefix

internal/cmd/db.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/spf13/cobra"
 	"github.com/tursodatabase/turso-cli/internal"
@@ -66,9 +67,22 @@ func getDatabase(client *turso.Client, name string, fresh ...bool) (turso.Databa
 		}
 	}
 
+	if suggestion := suggestDatabaseName(name, databases); suggestion != "" {
+		return turso.Database{}, fmt.Errorf("database %s not found. Did you mean %s? List known databases using %s", internal.Emph(name), internal.Emph(suggestion), internal.Emph("turso db list"))
+	}
 	return turso.Database{}, fmt.Errorf("database %s not found. List known databases using %s", internal.Emph(name), internal.Emph("turso db list"))
 }
 
+func suggestDatabaseName(name string, databases []turso.Database) string {
+	for _, database := range databases {
+		hostPrefix, _, _ := strings.Cut(database.Hostname, ".")
+		if hostPrefix == name {
+			return database.Name
+		}
+	}
+	return ""
+}
+
 func listDatabases(client *turso.Client) ([]turso.Database, error) {
 	if !flags.V3Api() {
 		return listDatabasesV2(client)

internal/cmd/db_test.go

@@ -0,0 +1,39 @@
+package cmd
+
+import (
+	"testing"
+
+	"github.com/tursodatabase/turso-cli/internal/turso"
+)
+
+func TestSuggestDatabaseNameFromHostnamePrefix(t *testing.T) {
+	databases := []turso.Database{
+		{
+			Name:     "hello",
+			Hostname: "hello-penberg.turso.io",
+		},
+		{
+			Name:     "other",
+			Hostname: "other-penberg.turso.io",
+		},
+	}
+
+	got := suggestDatabaseName("hello-penberg", databases)
+	if got != "hello" {
+		t.Fatalf("suggestDatabaseName() = %q, want %q", got, "hello")
+	}
+}
+
+func TestSuggestDatabaseNameIgnoresUnmatchedName(t *testing.T) {
+	databases := []turso.Database{
+		{
+			Name:     "hello",
+			Hostname: "hello-penberg.turso.io",
+		},
+	}
+
+	got := suggestDatabaseName("missing", databases)
+	if got != "" {
+		t.Fatalf("suggestDatabaseName() = %q, want empty string", got)
+	}
+}