Shows root command help considering if it implements #call

Author: gustavothecoder

lib/dry/cli/banner.rb

@@ -37,9 +37,19 @@ def self.command_name(name)
       # @since 0.1.0
       # @api private
       def self.command_name_and_arguments(command, name)
-        usage = "\nUsage:\n  #{name}#{arguments(command)}"
+        usage = "\nUsage:\n"
 
-        return usage + " | #{name} SUBCOMMAND" if command.subcommands.any?
+        callable_root_command = false
+        if command.new.respond_to?(:call)
+          callable_root_command = true
+          usage += "  #{name}#{arguments(command)}"
+        end
+
+        if command.subcommands.any?
+          usage += " "
+          usage += "|" if callable_root_command
+          usage += " #{name} SUBCOMMAND"
+        end
 
         usage
       end

spec/support/shared_examples/inherited_commands.rb

@@ -27,6 +27,27 @@
       expect(error).to eq(expected)
     end
 
+    it "shows root command help considering if it implements #call" do
+      output = capture_output { cli.call(arguments: %w[namespace --help]) }
+      expected = <<~DESC
+        Command:
+          #{cmd} namespace
+
+        Usage:
+          #{cmd} namespace SUBCOMMAND
+
+        Description:
+          This is a namespace
+
+        Subcommands:
+          sub-command                       # I'm a concrete command
+
+        Options:
+          --help, -h                        # Print this help
+      DESC
+      expect(output).to eq(expected)
+    end
+
     it "shows run's help" do
       output = capture_output { cli.call(arguments: %w[i run --help]) }
       expected = <<~DESC