Move to a profile-based configuration where common

This patch makes it so common configuration is now located in shared/
and each host basically just becomes a bunch of import statements.

The exception here is host-specific configuration like the `*.linus.onl`
that live inside `hosts/ahmed/`.

Specifically I have:

- moved common configuration `shared/{nixos,home-manager,nix-darwin}`.
- moved `hosts/common.nix` to `shared/nixos/common-{nix,shell}-settings.nix`.
- split `hosts/muhammed/{dev-utils,neovim}` into per-language
  configuration.

This patch was done in preparation for the arrival of a new host, which
will need to share a lot of configuration with Muhammed.

1 files changed, 28 insertions, 0 deletions

diff --git a/shared/home-manager/neovim/default.nix b/shared/home-manager/neovim/default.nix
new file mode 100644
index 0000000..63a7564
--- /dev/null
+++ b/shared/home-manager/neovim/default.nix
@@ -0,0 +1,28 @@
+# This file contains the HM configuration options for Neovim.
+{...}: {
+  imports = [
+    ./completion.nix
+    ./editing-plugins.nix
+    ./lsp.nix
+  ];
+
+  programs.neovim = {
+    enable = true;
+
+    # Import my existing config. I've been working on this for years and when
+    # my enthusiasm for Nix eventually dies off, I want to take it with me.
+    extraConfig = builtins.readFile ./init.vim;
+
+    # Typing `vi`, `vim`, or `vimdiff` will also run neovim.
+    viAlias = true;
+    vimAlias = true;
+    vimdiffAlias = true;
+  };
+
+  # Set Neovim as the default editor.
+  home.sessionVariables.EDITOR = "nvim";
+  home.sessionVariables.VISUAL = "nvim";
+
+  # Use neovim as man pager.
+  home.sessionVariables.MANPAGER = "nvim +Man!";
+}