How can I print source code in OS X (HTML/PHP) with number lines and without long line truncation? I was used to Gedit on Linux, but here it seems I can't obtain the same with applications such as TextWrangler or TextEdit.
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.
enscript can be installed via Homebrew and used via Terminal. Start with
enscript -CG2rE -U2 my-source-file.PHP
and read the (extensive) man page for additional features.
Have you looked at GeSHi? http://qbnz.com/highlighter/demo.php
You didn't specify the purpose for printing out - but I use this to "prettify" any code I expect to be printed - it does line numbering and syntax highlighting for a wide range of languages.
Hope this helps!