Fix help with command aliasesfix_help_with_command_aliases

When using the `-h` flag with command aliases, bundler was showing a
default help page instead of our manual, so that for example, `bundle
help install` and `bundle install --help` output would be inconstent
with `bundle i --help`.

This commit fixes that.

2 files changed, 70 insertions, 2 deletions

diff --git a/lib/bundler/cli.rb b/lib/bundler/cli.rb
index ea2d5c9de3..bacbb8dbde 100644
--- a/lib/bundler/cli.rb
+++ b/lib/bundler/cli.rb
@@ -36,8 +36,22 @@ module Bundler
       end
     end
 
+    def self.all_aliases
+      @all_aliases ||= begin
+                         command_aliases = {}
+
+                         COMMAND_ALIASES.each do |name, aliases|
+                           Array(aliases).each do |one_alias|
+                             command_aliases[one_alias] = name
+                           end
+                         end
+
+                         command_aliases
+                       end
+    end
+
     def self.aliases_for(command_name)
-      COMMAND_ALIASES.slice(command_name).invert
+      COMMAND_ALIASES.select {|k, _| k == command_name }.invert
     end
 
     def initialize(*args)
@@ -694,13 +708,17 @@ module Bundler
     # Reformat the arguments passed to bundle that include a --help flag
     # into the corresponding `bundle help #{command}` call
     def self.reformatted_help_args(args)
-      bundler_commands = all_commands.keys
+      bundler_commands = (COMMAND_ALIASES.keys + COMMAND_ALIASES.values).flatten
+
       help_flags = %w[--help -h]
       exec_commands = ["exec"] + COMMAND_ALIASES["exec"]
 
       help_used = args.index {|a| help_flags.include? a }
       exec_used = args.index {|a| exec_commands.include? a }
+
       command = args.find {|a| bundler_commands.include? a }
+      command = all_aliases[command] if all_aliases[command]
+
       if exec_used && help_used
         if exec_used + help_used == 1
           %w[help exec]
diff --git a/spec/bundler/cli_spec.rb b/spec/bundler/cli_spec.rb
index 02e5155733..ddcd699d6c 100644
--- a/spec/bundler/cli_spec.rb
+++ b/spec/bundler/cli_spec.rb
@@ -27,6 +27,56 @@ RSpec.describe "bundle executable" do
     expect(out).to eq("Hello, world")
   end
 
+  describe "aliases" do
+    it "aliases e to exec" do
+      bundle "e --help"
+
+      expect(out).to include("BUNDLE-EXEC")
+    end
+
+    it "aliases ex to exec" do
+      bundle "ex --help"
+
+      expect(out).to include("BUNDLE-EXEC")
+    end
+
+    it "aliases exe to exec" do
+      bundle "exe --help"
+
+      expect(out).to include("BUNDLE-EXEC")
+    end
+
+    it "aliases c to check" do
+      bundle "c --help"
+
+      expect(out).to include("BUNDLE-CHECK")
+    end
+
+    it "aliases i to install" do
+      bundle "i --help"
+
+      expect(out).to include("BUNDLE-INSTALL")
+    end
+
+    it "aliases ls to list" do
+      bundle "ls --help"
+
+      expect(out).to include("BUNDLE-LIST")
+    end
+
+    it "aliases package to cache" do
+      bundle "package --help"
+
+      expect(out).to include("BUNDLE-CACHE")
+    end
+
+    it "aliases pack to cache" do
+      bundle "pack --help"
+
+      expect(out).to include("BUNDLE-CACHE")
+    end
+  end
+
   context "with no arguments" do
     it "prints a concise help message", :bundler => "3" do
       bundle! ""