ref(home/shell): make it easier to share common things between shells

I'm considering trying again fish, and there are a number of things that
should be common between zsh and fish (aliases, environment variables,
...).

Instead of duplicating these settings multiple time, I'm consolidating
the shell configurations under `home/shell`, and I can set the shell I
want to use with `my.home.shell.name`.

The first step is to move the modules for fish and zsh under
`home/shell`, add an interface to pick which one I want to use, and
modify the `host/home.nix` configuration to keep using zsh with the new
interface.

Change-Id: Idb66b1a6fcc11a6eeaf5fd2d32dd3698d2d85bdf
Reviewed-on: https://cl.fcuny.net/c/world/+/455
Tested-by: CI
Reviewed-by: Franck Cuny <franck@fcuny.net>

1 files changed, 16 insertions, 0 deletions

diff --git a/home/shell/default.nix b/home/shell/default.nix
new file mode 100644
index 0000000..35a6275
--- /dev/null
+++ b/home/shell/default.nix
@@ -0,0 +1,16 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let cfg = config.my.home.shell;
+in
+{
+  options.my.home.shell = {
+    name = mkOption {
+      default = "zsh";
+      type = types.enum [ "fish" "zsh" ];
+      example = "zsh";
+    };
+  };
+
+  imports = [ ./fish ./zsh ];
+}