add helped functions to generate footprints

hardware/lib/footprints/element.rb

@@ -0,0 +1,30 @@
+# encoding: utf-8
+# written for ruby 2.1.0
+# helper functions to generate gEDA pcb files (on stdout)
+
+# simple method to clean the dimension
+def dim(dimension)
+  return dimension.round(3).to_s+UNIT
+end
+
+# print parameters within an element
+def element(name,params)
+  to_return = ""
+  to_return += name
+  to_return += '['
+  params.collect! do |param|
+    case param
+    when Symbol
+      param.to_s
+    when String
+      '"'+param+'"'
+    when Fixnum, Float
+      dim(param)
+    else 
+      raise "unknowm paramter type: #{param.class}"
+    end
+  end
+  to_return += params*' '
+  to_return += ']'
+  return to_return
+end