5 files changed, 98 insertions, 21 deletions
diff --git a/README.markdown b/README.markdown
index cbe42b4..9c6a54b 100644
--- a/README.markdown
+++ b/README.markdown
@@ -363,8 +363,8 @@ returns the value of the resource's parameter. For example, the following code r
 * `prefix`: This function applies a prefix to all elements in an array or to the keys in a hash. For example, `prefix(['a','b','c'], 'p')` returns ['pa','pb','pc'], and `prefix({'a'=>'b','b'=>'c','c'=>'d'}, 'p')` returns {'pa'=>'b','pb'=>'c','pc'=>'d'}. *Type*: rvalue
 
 
-* `private`: This function sets the current class or definition as private.
-Calling the class or definition from outside the current module will fail. For example, `private()` called in class `foo::bar` outputs the following message if class is called from outside module `foo`:
+* `assert_private`: This function sets the current class or definition as private.
+Calling the class or definition from outside the current module will fail. For example, `assert_private()` called in class `foo::bar` outputs the following message if class is called from outside module `foo`:
 
   ```
   Class foo::bar is private
@@ -373,7 +373,7 @@ Calling the class or definition from outside the current module will fail. For e
   You can specify the error message you want to use:
 
   ```
-  private("You're not supposed to do that!")
+  assert_private("You're not supposed to do that!")
   ```
 
   *Type*: statement
diff --git a/lib/puppet/parser/functions/assert_private.rb b/lib/puppet/parser/functions/assert_private.rb
new file mode 100644
index 0000000..66c79cc
--- /dev/null
+++ b/lib/puppet/parser/functions/assert_private.rb
@@ -0,0 +1,29 @@
+#
+# assert_private.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:assert_private, :doc => <<-'EOS'
+    Sets the current class or definition as private.
+    Calling the class or definition from outside the current module will fail.
+    EOS
+  ) do |args|
+
+    raise(Puppet::ParseError, "assert_private(): Wrong number of arguments "+
+      "given (#{args.size}}) for 0 or 1)") if args.size > 1
+
+    scope = self
+    if scope.lookupvar('module_name') != scope.lookupvar('caller_module_name')
+      message = nil
+      if args[0] and args[0].is_a? String
+        message = args[0]
+      else
+        manifest_name = scope.source.name
+        manifest_type = scope.source.type
+        message = (manifest_type.to_s == 'hostclass') ? 'Class' : 'Definition'
+        message += " #{manifest_name} is private"
+      end
+      raise(Puppet::ParseError, message)
+    end
+  end
+end
diff --git a/lib/puppet/parser/functions/private.rb b/lib/puppet/parser/functions/private.rb
index 60210d3..3b00ba1 100644
--- a/lib/puppet/parser/functions/private.rb
+++ b/lib/puppet/parser/functions/private.rb
@@ -4,26 +4,14 @@
 
 module Puppet::Parser::Functions
   newfunction(:private, :doc => <<-'EOS'
-    Sets the current class or definition as private.
+    DEPRECATED: Sets the current class or definition as private.
     Calling the class or definition from outside the current module will fail.
-    EOS
+  EOS
   ) do |args|
-
-    raise(Puppet::ParseError, "private(): Wrong number of arguments "+
-      "given (#{args.size}}) for 0 or 1)") if args.size > 1
-
-    scope = self
-    if scope.lookupvar('module_name') != scope.lookupvar('caller_module_name')
-      message = nil
-      if args[0] and args[0].is_a? String
-        message = args[0]
-      else
-        manifest_name = scope.source.name
-        manifest_type = scope.source.type
-        message = (manifest_type.to_s == 'hostclass') ? 'Class' : 'Definition'
-        message += " #{manifest_name} is private"
-      end
-      raise(Puppet::ParseError, message)
+    warning("private() DEPRECATED: This function will cease to function on Puppet 4; please use assert_private() before upgrading to puppet 4 for backwards-compatibility, or migrate to the new parser's typing system.")
+    if !Puppet::Parser::Functions.autoloader.loaded?(:assert_private)
+      Puppet::Parser::Functions.autoloader.load(:assert_private)
     end
+    function_assert_private([(args[0] unless args.size < 1)])
   end
 end
diff --git a/spec/functions/assert_private_spec.rb b/spec/functions/assert_private_spec.rb
new file mode 100755
index 0000000..a009d28
--- /dev/null
+++ b/spec/functions/assert_private_spec.rb
@@ -0,0 +1,55 @@
+#! /usr/bin/env ruby -S rspec
+require 'spec_helper'
+
+describe Puppet::Parser::Functions.function(:assert_private) do
+  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+  subject do
+    function_name = Puppet::Parser::Functions.function(:assert_private)
+    scope.method(function_name)
+  end
+
+  context "when called from inside module" do
+    it "should not fail" do
+      scope.expects(:lookupvar).with('module_name').returns('foo')
+      scope.expects(:lookupvar).with('caller_module_name').returns('foo')
+      expect {
+        subject.call []
+      }.not_to raise_error
+    end
+  end
+
+  context "with an explicit failure message" do
+    it "prints the failure message on error" do
+      scope.expects(:lookupvar).with('module_name').returns('foo')
+      scope.expects(:lookupvar).with('caller_module_name').returns('bar')
+      expect {
+        subject.call ['failure message!']
+      }.to raise_error Puppet::ParseError, /failure message!/
+    end
+  end
+
+  context "when called from private class" do
+    it "should fail with a class error message" do
+      scope.expects(:lookupvar).with('module_name').returns('foo')
+      scope.expects(:lookupvar).with('caller_module_name').returns('bar')
+      scope.source.expects(:name).returns('foo::baz')
+      scope.source.expects(:type).returns('hostclass')
+      expect {
+        subject.call []
+      }.to raise_error Puppet::ParseError, /Class foo::baz is private/
+    end
+  end
+
+  context "when called from private definition" do
+    it "should fail with a class error message" do
+      scope.expects(:lookupvar).with('module_name').returns('foo')
+      scope.expects(:lookupvar).with('caller_module_name').returns('bar')
+      scope.source.expects(:name).returns('foo::baz')
+      scope.source.expects(:type).returns('definition')
+      expect {
+        subject.call []
+      }.to raise_error Puppet::ParseError, /Definition foo::baz is private/
+    end
+  end
+end
diff --git a/spec/functions/private_spec.rb b/spec/functions/private_spec.rb
index c70759f..c90282e 100755..100644
--- a/spec/functions/private_spec.rb
+++ b/spec/functions/private_spec.rb
@@ -9,6 +9,11 @@ describe Puppet::Parser::Functions.function(:private) do
     scope.method(function_name)
   end
 
+  it 'should issue a warning' do
+    scope.expects(:warning).with("private() DEPRECATED: This function will cease to function on Puppet 4; please use assert_private() before upgrading to puppet 4 for backwards-compatibility, or migrate to the new parser's typing system.")
+    subject.call []
+  end
+
   context "when called from inside module" do
     it "should not fail" do
       scope.expects(:lookupvar).with('module_name').returns('foo')