I don't know how to make the code editor in Mathematica present the code in a real 'monospace' font, with a dark, customisable theme (syntax highlighting and so on). This is something that keeps me away from working with Mathematica as my primary programming environment.
I mean, I like Mathematica, but I only use it like I used Derive in my old high school days: as a powerful tool for symbolic mathematics, plus some nice 2D and 3D graphics.
I'd like to use Mathematica as my main framework for scientific programming, ie:
A customisable editor (in the terms I expressed at the beginning of this post).
Separate code (files with functions and routines) from execution (console).
A debugging environment.
Notebooks are fine, but can I have a classic programming environment?
Please help me with this basic question.