Print a better messages on undocumented flags

Inform about complete removal when `bundle show --outdated` and `bundle
show --verbose`.

2 files changed, 40 insertions, 8 deletions

diff --git a/lib/bundler/cli.rb b/lib/bundler/cli.rb
index d11172ed44..c58d0875d5 100644
--- a/lib/bundler/cli.rb
+++ b/lib/bundler/cli.rb
@@ -296,17 +296,21 @@ module Bundler
         if ARGV[0] == "show"
           rest = ARGV[1..-1]
 
-          new_command = rest.find {|arg| !arg.start_with?("--") } ? "info" : "list"
+          if flag = rest.find{|arg| ["--verbose", "--outdated"].include?(arg) }
+            Bundler::SharedHelpers.major_deprecation(2, "the `#{flag}` flag to `bundle show` was undocumented and will be removed without replacement")
+          else
+            new_command = rest.find {|arg| !arg.start_with?("--") } ? "info" : "list"
 
-          new_arguments = rest.map do |arg|
-            next arg if arg != "--paths"
-            next "--path" if new_command == "info"
-          end
+            new_arguments = rest.map do |arg|
+              next arg if arg != "--paths"
+              next "--path" if new_command == "info"
+            end
 
-          old_argv = ARGV.join(" ")
-          new_argv = [new_command, *new_arguments.compact].join(" ")
+            old_argv = ARGV.join(" ")
+            new_argv = [new_command, *new_arguments.compact].join(" ")
 
-          Bundler::SharedHelpers.major_deprecation(2, "use `bundle #{new_argv}` instead of `bundle #{old_argv}`")
+            Bundler::SharedHelpers.major_deprecation(2, "use `bundle #{new_argv}` instead of `bundle #{old_argv}`")
+          end
         end
         require "bundler/cli/show"
         Show.new(options, gem_name).run
diff --git a/spec/other/major_deprecation_spec.rb b/spec/other/major_deprecation_spec.rb
index 6d3d55be0f..3d79a51b94 100644
--- a/spec/other/major_deprecation_spec.rb
+++ b/spec/other/major_deprecation_spec.rb
@@ -486,6 +486,34 @@ The :gist git source is deprecated, and will be removed in the future. Add this
       end
     end
 
+    context "with --outdated flag" do
+      before do
+        bundle! "show --outdated"
+      end
+
+      it "does not print a deprecation warning", :bundler => "< 2" do
+        expect(deprecations).to be_empty
+      end
+
+      it "prints a deprecation warning informing about its removal", :bundler => "2" do
+        expect(deprecations).to include("the `--outdated` flag to `bundle show` was undocumented and will be removed without replacement")
+      end
+    end
+
+    context "with --verbose flag" do
+      before do
+        bundle! "show --verbose"
+      end
+
+      it "does not print a deprecation warning", :bundler => "< 2" do
+        expect(deprecations).to be_empty
+      end
+
+      it "prints a deprecation warning informing about its removal", :bundler => "2" do
+        expect(deprecations).to include("the `--verbose` flag to `bundle show` was undocumented and will be removed without replacement")
+      end
+    end
+
     context "with a gem argument" do
       before do
         bundle! "show rack"