cat file with syntax coloring

[thevpc]

Cat should enable displaying the content of a file with syntax highlighting/coloring provided that "--highlight" or "-H" for instance is armed and the file is supported by ntf.

The highlighter should be detected by file content type and/or file extension.

The highlighter should be customizable like this

nuts cat --highlight=java  file.txt

At least, now the following formats are supported:

• plain text
• json
• xml
• yaml
• java
• ntf

This feature is important, at least to help testing NTF format.

[thevpc]

I think the same should go for the following commands as well (let's use the same options --highlight):

• echo
• grep
  Are there other commands that should inherit this behavior?