Preview source files from a directory as text files

There are many file extensions or file names which often describe source files of one programming languages. Some examples are:
- C Programming Language Headers (*.h) and sources (*.c)
- C++ (*.cpp).
- Java Source files (*.java)
- Makefiles (Makefile)
- Shell Scripts (*.sh)
- Ant Build files (build.xml)
- LaTeX sources (*.tex)
And many more.

I propose those files to be previewed as text files.