[ruby/rubygems] Allow to show cli_help with bundler executable

ruby/rubygems@a091e3fd10

Author: hsbt

lib/bundler/cli.rb

@@ -104,7 +104,7 @@ def cli_help
       primary_commands = ["install", "update", "cache", "exec", "config", "help"]
 
       list = self.class.printable_commands(true)
-      by_name = list.group_by {|name, _message| name.match(/^bundle (\w+)/)[1] }
+      by_name = list.group_by {|name, _message| name.match(/^bundler? (\w+)/)[1] }
       utilities = by_name.keys.sort - primary_commands
       primary_commands.map! {|name| (by_name[name] || raise("no primary command #{name}")).first }
       utilities.map! {|name| by_name[name].first }

spec/bundler/bundler/cli_spec.rb

@@ -282,4 +282,15 @@ def out_with_macos_man_workaround
     bundler "--version"
     expect(out).to eq("#{Bundler::VERSION} (simulating Bundler 5)")
   end
+
+  it "shows cli_help when bundler install and no Gemfile is found" do
+    bundler "install", raise_on_error: false
+    expect(err).to include("Could not locate Gemfile")
+
+    expect(out).to include("Bundler version #{Bundler::VERSION}").
+      and include("\n\nBundler commands:\n\n").
+      and include("\n\n  Primary commands:\n").
+      and include("\n\n  Utilities:\n").
+      and include("\n\nOptions:\n")
+  end
 end