1 files changed, 127 insertions, 0 deletions
diff --git a/lib/bundler/plugin/events.rb b/lib/bundler/plugin/events.rb
new file mode 100644
index 0000000000..3fbf60307e
--- /dev/null
+++ b/lib/bundler/plugin/events.rb
@@ -0,0 +1,127 @@
+# frozen_string_literal: true
+
+module Bundler
+  module Plugin
+    module Events
+      def self.define(const, event)
+        const = const.to_sym.freeze
+        if const_defined?(const) && const_get(const) != event
+          raise ArgumentError, "Attempting to reassign #{const} to a different value"
+        end
+        const_set(const, event) unless const_defined?(const)
+        @events ||= {}
+        @events[event] = const
+      end
+      private_class_method :define
+
+      def self.reset
+        @events.each_value do |const|
+          remove_const(const)
+        end
+        @events = nil
+      end
+      private_class_method :reset
+
+      # Check if an event has been defined
+      # @param event [String] An event to check
+      # @return [Boolean] A boolean indicating if the event has been defined
+      def self.defined_event?(event)
+        @events ||= {}
+        @events.key?(event)
+      end
+
+      # @!parse
+      #   A hook called before the Gemfile is evaluated
+      #   Includes the Gemfile path and the Lockfile path
+      #   GEM_BEFORE_EVAL = "before-eval"
+      define :GEM_BEFORE_EVAL, "before-eval"
+
+      # @!parse
+      #   A hook called after the Gemfile is evaluated
+      #   Includes a Bundler::Definition
+      #   GEM_AFTER_EVAL = "after-eval"
+      define :GEM_AFTER_EVAL, "after-eval"
+
+      # @!parse
+      #   A hook called before any gems install
+      #   Includes an Array of Bundler::Dependency objects
+      #   GEM_BEFORE_INSTALL_ALL = "before-install-all"
+      define :GEM_BEFORE_INSTALL_ALL, "before-install-all"
+
+      # @!parse
+      #   A hook called before each individual gem is downloaded from a remote source.
+      #   Includes a spec-like object responding to the Gem::Specification API
+      #   (for example, a Bundler spec proxy such as Bundler::EndpointSpecification
+      #   or Bundler::RemoteSpecification). Does not fire when the gem is already
+      #   present at the initial download-cache check.
+      #   GEM_BEFORE_FETCH = "before-fetch"
+      define :GEM_BEFORE_FETCH, "before-fetch"
+
+      # @!parse
+      #   A hook called after each individual gem is downloaded from a remote source.
+      #   Includes a spec-like object responding to the Gem::Specification API
+      #   (for example, a Bundler spec proxy such as Bundler::EndpointSpecification
+      #   or Bundler::RemoteSpecification). Does not fire when the gem is already
+      #   present at the initial download-cache check.
+      #   GEM_AFTER_FETCH = "after-fetch"
+      define :GEM_AFTER_FETCH, "after-fetch"
+
+      # @!parse
+      #   A hook called before a git source is fetched or checked out.
+      #   Includes a Bundler::Source::Git reference.
+      #   GIT_BEFORE_FETCH = "before-git-fetch"
+      define :GIT_BEFORE_FETCH, "before-git-fetch"
+
+      # @!parse
+      #   A hook called after a git source is fetched or checked out.
+      #   Includes a Bundler::Source::Git reference.
+      #   GIT_AFTER_FETCH = "after-git-fetch"
+      define :GIT_AFTER_FETCH, "after-git-fetch"
+
+      # @!parse
+      #   A hook called before each individual gem is installed
+      #   Includes a Bundler::ParallelInstaller::SpecInstallation.
+      #   No state, error, post_install_message will be present as nothing has installed yet
+      #   GEM_BEFORE_INSTALL = "before-install"
+      define :GEM_BEFORE_INSTALL, "before-install"
+
+      # @!parse
+      #   A hook called after each individual gem is installed
+      #   Includes a Bundler::ParallelInstaller::SpecInstallation.
+      #     - If state is failed, an error will be present.
+      #     - If state is success, a post_install_message may be present.
+      #   GEM_AFTER_INSTALL = "after-install"
+      define :GEM_AFTER_INSTALL,  "after-install"
+
+      # @!parse
+      #   A hook called after any gems install
+      #   Includes an Array of Bundler::Dependency objects
+      #   GEM_AFTER_INSTALL_ALL = "after-install-all"
+      define :GEM_AFTER_INSTALL_ALL,  "after-install-all"
+
+      # @!parse
+      #   A hook called before any gems require
+      #   Includes an Array of Bundler::Dependency objects.
+      #   GEM_BEFORE_REQUIRE_ALL = "before-require-all"
+      define :GEM_BEFORE_REQUIRE_ALL, "before-require-all"
+
+      # @!parse
+      #   A hook called before each individual gem is required
+      #   Includes a Bundler::Dependency.
+      #   GEM_BEFORE_REQUIRE = "before-require"
+      define :GEM_BEFORE_REQUIRE, "before-require"
+
+      # @!parse
+      #   A hook called after each individual gem is required
+      #   Includes a Bundler::Dependency.
+      #   GEM_AFTER_REQUIRE = "after-require"
+      define :GEM_AFTER_REQUIRE,  "after-require"
+
+      # @!parse
+      #   A hook called after all gems required
+      #   Includes an Array of Bundler::Dependency objects.
+      #   GEM_AFTER_REQUIRE_ALL = "after-require-all"
+      define :GEM_AFTER_REQUIRE_ALL, "after-require-all"
+    end
+  end
+end