home: add atuin

I really like the `fzf` history widget, and this is not as good UI-wise.

However I like the fact that this uses a DB:

* It is more reliable when the history file gets messed up [1]
* It allows syncing between different hosts (not sure if I will use it)
* It adds more context to the search
    * The current directory
    * The shell _session_, I can *either* search all sessions or
      restrict to just the current one

I will be looking into whether or not I can hack something together to
get a better UI (by using `fzf` of course).

home/atuin/default.nix

@@ -0,0 +1,27 @@
+{ config, lib, ... }:
+let
+  cfg = config.my.home.atuin;
+in
+{
+  options.my.home.atuin = with lib; {
+    enable = my.mkDisableOption "atuin configuration";
+  };
+
+  config = lib.mkIf cfg.enable {
+    programs.atuin = {
+      enable = true;
+
+      flags = [
+        # I *despise* this hijacking of the up key, even though I use Ctrl-p
+        "--disable-up-arrow"
+      ];
+
+      settings = {
+        # The package is managed by Nix
+        update_check = false;
+        # I don't care for the fancy display
+        style = "compact";
+      };
+    };
+  };
+}

home/default.nix

@@ -1,6 +1,7 @@
 { ... }:
 {
   imports = [
+    ./atuin
     ./bat
     ./bluetooth
     ./comma