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# Suntheme # Suntheme
runs a script on sunrise and sunset, written in pure haskell. Runs a script on sunrise and sunset, written in pure Haskell
---
You may be wondering how a program written in Haskell, the purely functional You may be wondering how a program written in Haskell, the purely functional
programming language, could possibly act on the real world by running a so-called "script". programming language, could possibly act on the real world by running a so-called "script."
It's simple. We take in the entire World as an input to a pure function, the IO Monad. It's simple. We take in the entire World as an input to a pure function, the IO Monad.
It then maps the original World to the changed World, with our desired IO actions carefully applied. It then maps the original World to a new (generated) World, with our desired IO actions carefully applied with mathematical precision.
> From the second perspective, an IO action transforms the whole world. IO actions are actually pure, because they receive a unique world as an argument and then return the changed world. > From the second perspective, an IO action transforms the whole world. IO actions are actually pure, because they receive a unique world as an argument and then return the changed world.
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## Hacking on suntheme ## Hacking on suntheme
It's trivially easy to get started with suntheme development thanks to [Nix](https://nixos.org/), the purely functional package manager. It's trivial to get started with suntheme development thanks to [Nix](https://nixos.org/), the purely functional package manager.
Naturally, we leverage it as our primary package manager, for both Hackage packages and development tools like language servers and the like. Naturally, we leverage it as our primary package manager, both for Hackage and development tools like language servers and the like.
First, install Nix through your preferred avenue. If unsure, we recommend [the Determinate Nix Installer](https://github.com/DeterminateSystems/nix-installer). First, install Nix through your preferred avenue or local system administrator. If unsure, we recommend [the Determinate Nix Installer](https://github.com/DeterminateSystems/nix-installer).
Make sure flakes and nix-command are enabled (the Determinate Installer will enable them by default). Make sure flakes and nix-command are enabled (the Determinate Installer will enable them by default).
Once you have `nix`, simply type Once you have `nix`, simply type:
```bash ```bash
nix develop nix develop