Printing source code with OS X
You can print source code with line numbers and without truncation in TextWrangler, the key is Soft wrap text.


Turn on "Soft Wrap Text" under Text Options. 
Open TextWrangler > Preferences
Select "Text Printing" then check the "Print line numbers" checkbox.
Print again, long lines should wrap and line numbers should be present.


Note: you may want to set up "Editor Defaults" in TextWrangler's Preferences, and have it Soft wrap text for you for each file you edit, and to a specified width too.