flake: Initialise new repository

modules/home-manager/shell/fish.nix

@@ -0,0 +1,22 @@
+{
+  programs.fish = {
+    enable = true;
+
+    interactiveShellInit = # fish
+      ''
+        set fish_greeting
+        set fish_vi_key_bindings
+        set fish_vi_cursor
+
+        eval $(/opt/homebrew/bin/brew shellenv fish)
+      '';
+
+    shellAbbrs = {
+      gs = "git status";
+      gc = "git commit";
+      gca = "git commit -a";
+      gcaa = "git commit -a --amend";
+      gco = "git checkout";
+    };
+  };
+}