implement new list command taken from bundler show

7 files changed, 76 insertions, 1 deletions

diff --git a/lib/bundler/cli.rb b/lib/bundler/cli.rb
index a1ad3055ca..3cefc90970 100644
--- a/lib/bundler/cli.rb
+++ b/lib/bundler/cli.rb
@@ -261,7 +261,18 @@ module Bundler
       Show.new(options, gem_name).run
     end
     # TODO: 2.0 remove `bundle show`
-    map %w[list] => "show"
+
+    if Bundler.feature_flag.list_command?
+      desc "list", "list all gems in the bundle"
+      def list
+        require "bundler/cli/list"
+        List.new.run
+      end
+
+      map %w[ls] => "list"
+    else
+      map %w[list] => "show"
+    end
 
     desc "info GEM [OPTIONS]", "Show information for the given gem"
     method_option "path", :type => :boolean, :banner => "Print full path to gem"
diff --git a/lib/bundler/cli/list.rb b/lib/bundler/cli/list.rb
new file mode 100644
index 0000000000..623e2bc076
--- /dev/null
+++ b/lib/bundler/cli/list.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module Bundler
+  class CLI::List
+    def run
+      specs = Bundler.load.specs.reject {|s| s.name == "bundler" }
+
+      return Bundler.ui.info "No gems in the Gemfile" if specs.empty?
+      Bundler.ui.info "Gems included by the bundle:"
+      specs.sort_by(&:name).each do |s|
+        Bundler.ui.info "  * #{s.name} (#{s.version}#{s.git_version})"
+      end
+
+      Bundler.ui.info "Use `bundle info` to print more detailed information about a gem"
+    end
+  end
+end
diff --git a/lib/bundler/feature_flag.rb b/lib/bundler/feature_flag.rb
index 67b89d89d3..2dedbbabbc 100644
--- a/lib/bundler/feature_flag.rb
+++ b/lib/bundler/feature_flag.rb
@@ -48,6 +48,7 @@ module Bundler
     settings_flag(:unlock_source_unlocks_spec) { !bundler_2_mode? }
     settings_flag(:update_requires_all_flag) { bundler_2_mode? }
     settings_flag(:default_install_uses_path) { bundler_2_mode? }
+    settings_flag(:list_command) { bundler_2_mode? }
 
     settings_option(:default_cli_command) { bundler_2_mode? ? :cli_help : :install }
 
diff --git a/lib/bundler/settings.rb b/lib/bundler/settings.rb
index 15168b42e4..23469fc7c8 100644
--- a/lib/bundler/settings.rb
+++ b/lib/bundler/settings.rb
@@ -34,6 +34,7 @@ module Bundler
       global_gem_cache
       ignore_messages
       init_gems_rb
+      list_command
       lockfile_uses_separate_rubygems_sources
       major_deprecations
       no_install
diff --git a/man/bundle-config.ronn b/man/bundle-config.ronn
index dd315b9955..87d1013129 100644
--- a/man/bundle-config.ronn
+++ b/man/bundle-config.ronn
@@ -193,6 +193,8 @@ learn more about their operation in [bundle install(1)][bundle-install].
    Generate a `gems.rb` instead of a `Gemfile` when running `bundle init`.
 * `jobs` (`BUNDLE_JOBS`):
    The number of gems Bundler can install in parallel. Defaults to 1.
+* `list_command` (`BUNDLE_LIST_COMMAND`)
+   Enable new list command feature
 * `major_deprecations` (`BUNDLE_MAJOR_DEPRECATIONS`):
    Whether Bundler should print deprecation warnings for behavior that will
    be changed in the next major version.
diff --git a/man/bundle-list.ronn b/man/bundle-list.ronn
new file mode 100644
index 0000000000..3a883bf5ff
--- /dev/null
+++ b/man/bundle-list.ronn
@@ -0,0 +1,10 @@
+bundle-list(1) -- List all the gems in the bundle
+=========================================================================
+
+## SYNOPSIS
+
+`bundle list`
+
+## DESCRIPTION
+
+Prints a list of all the gems in the bundle including their version
diff --git a/spec/commands/list_spec.rb b/spec/commands/list_spec.rb
new file mode 100644
index 0000000000..850ca24dc2
--- /dev/null
+++ b/spec/commands/list_spec.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+RSpec.describe "bundle list", :bundler => "2" do
+  before do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      gem "rack"
+    G
+  end
+
+  context "when no gems are in the gemfile" do
+    before do
+      install_gemfile <<-G
+        source "file://#{gem_repo1}"
+      G
+    end
+
+    it "prints message saying no gems are in the bundle" do
+      bundle "list"
+      expect(out).to include("No gems in the Gemfile")
+    end
+  end
+
+  it "lists gems installed in the bundle" do
+    bundle "list"
+    expect(out).to include("  * rack (1.0.0)")
+  end
+
+  it "aliases the ls command to list" do
+    bundle "ls"
+    expect(out).to include("Gems included by the bundle")
+  end
+end