feat(file-templates): add Nix flake file template

config.org

@@ -2181,6 +2181,17 @@ This system works well for the most part, but there's a serious issue with its U
 
 Now that we have our new-and-improved template registry system, we can add new file templates as we please.
 
+**** Nix
+
+The default Nix file template is for a NixOS module. This is nice when you're writing a module, but most Nix files aren't modules. We'll restrict the default template to only trigger for files inside ~/etc/nixos~, and for there to be no template in other cases. We'll also add a template for flakes.
+
+#+begin_src emacs-lisp
+(set-file-templates!
+ '(nix-mode :remove t)
+ '("/etc/nixos/.*\\.nix$" :mode nix-mode)
+ '("/flake\\.nix$" :trigger "__flake.nix" :mode nix-mode))
+#+end_src
+
 ** Spell Checking
 
 #+call: confpkg("Pkg: ispell")

snippets/nix-mode/__flake.nix

@@ -0,0 +1,17 @@
+# -*- mode: snippet -*-
+# contributor: Kiana Sheibani <kiana.a.sheibani@gmail.com>
+# key: __flake.nix
+# name: nix flake template
+# --
+{
+  description = "${1:Flake description}";
+
+  inputs = {
+    ${2:nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    }${3:flake-utils.url = "github:numtide/flake-utils";
+    }$4
+  };
+
+  outputs = { self$5, ... }:
+    $0
+}

snippets/snippet-mode/__

@@ -1,5 +1,5 @@
 # -*- mode: snippet -*-
-# contributor: Kiana Sheibani
+# contributor: Kiana Sheibani <kiana.a.sheibani@gmail.com>
 # key: __
 # name: Snippet template
 # --