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-rw-r--r--lib/puppet/parser/functions/hash_merge.rb10
-rw-r--r--spec/unit/parser/functions/hash_merge.rb34
2 files changed, 44 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/hash_merge.rb b/lib/puppet/parser/functions/hash_merge.rb
new file mode 100644
index 0000000..831c754
--- /dev/null
+++ b/lib/puppet/parser/functions/hash_merge.rb
@@ -0,0 +1,10 @@
+Puppet::Parser::Functions::newfunction(
+ :hash_merge,
+ :type => :rvalue,
+ :doc => "Merges two hashes
+
+ Example: hash_merge({'a' => 1 ,'b' => 2},{'b' => 3, 'c' => 4}) -> {'a' => 1 ,'b' => 3, 'c' => 4}"
+) do |args|
+ raise Puppet::ParseError, 'hash_merge() needs two arguments' if args.length != 2
+ args[0].merge(args[1])
+end
diff --git a/spec/unit/parser/functions/hash_merge.rb b/spec/unit/parser/functions/hash_merge.rb
new file mode 100644
index 0000000..0bd8fc1
--- /dev/null
+++ b/spec/unit/parser/functions/hash_merge.rb
@@ -0,0 +1,34 @@
+#! /usr/bin/env ruby
+
+require File.dirname(__FILE__) + '/../../../spec_helper'
+
+describe "the hash_merge function" do
+
+ before :each do
+ @scope = Puppet::Parser::Scope.new
+ end
+
+ it "should exist" do
+ Puppet::Parser::Functions.function("hash_merge").should == "function_hash_merge"
+ end
+
+ it "should raise a ParseError if there is less than 2 arguments" do
+ lambda { @scope.function_hash_merge(["foo"]) }.should( raise_error(Puppet::ParseError))
+ end
+
+ it "should raise a ParseError if there is more than 2 arguments" do
+ lambda { @scope.function_hash_merge(["foo", "bar", "gazonk"]) }.should( raise_error(Puppet::ParseError))
+ end
+
+ it "should merge the two hashes" do
+ result = @scope.function_hash_merge([{'a' => 1 ,'b' => 2},{'b' => 3, 'c' => 4}])
+ result.should == {'a' => 1 ,'b' => 3, 'c' => 4}
+ end
+
+ it "should leave the argument untouched" do
+ a = {'a' => 1 ,'b' => 2}
+ result = @scope.function_hash_merge([{'a' => 1 ,'b' => 2},{'b' => 3, 'c' => 4}])
+ a.should == {'a' => 1 ,'b' => 2}
+ end
+
+end