Expose the functions of ruby's built-in Shellwords module (#580)

* Add shell_escape function, shell_join function & shell_split function

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/puppet/parser/functions/shell_join.rb b/lib/puppet/parser/functions/shell_join.rb
new file mode 100644
index 0000000..05aeb95
--- /dev/null
+++ b/lib/puppet/parser/functions/shell_join.rb
@@ -0,0 +1,31 @@
+#
+# shell_join.rb
+#
+
+require 'shellwords'
+
+module Puppet::Parser::Functions
+  newfunction(:shell_join, :type => :rvalue, :doc => <<-EOS
+Builds a command line string from the given array of strings. Each array item is escaped for Bourne shell. All items are
+then joined together, with a single space in between.
+
+This function behaves the same as ruby's Shellwords.shelljoin() function
+  EOS
+  ) do |arguments|
+
+    raise(Puppet::ParseError, "shell_join(): Wrong number of arguments " +
+        "given (#{arguments.size} for 1)") if arguments.size != 1
+
+    array = arguments[0]
+
+    raise Puppet::ParseError, ("First argument is not an Array: #{array.inspect}") unless array.is_a?(Array)
+
+    # explicit conversion to string is required for ruby 1.9
+    array = array.map { |item| item.to_s }
+    result = Shellwords.shelljoin(array)
+
+    return result
+  end
+end
+
+# vim: set ts=2 sw=2 et :