Add fish module to nix

nix/modules/fish/default.nix

@@ -0,0 +1,45 @@
+{ config, lib, pkgs, ... }:
+{
+  programs.zoxide = {
+    enable = true;
+    enableFishIntegration = true;
+    options = ["--cmd j"];
+  };
+
+  programs.fish = {
+    enable = true;
+
+    shellInit = ''
+      set --universal fish_greeting
+      set -g -x EDITOR "emacsclient"
+      set -g -x ALTERNATE_EDITOR "vim"
+      set -g -x TERMINAL "kitty"
+      set -g -x MANPAGER less -x
+
+      fish_add_path --path ~/.dotfiles/bin ~/.local/bin ~/bin
+
+      # TODO - Adjust for nix-managed Doom if I ever do that
+      fish_add_path ~/.emacs.d/bin
+      '';
+
+    shellAliases = {
+      ec = "emacsclient -n --alternate-editor=emacs";
+      pubip = "curl icanhazip.com";
+      src = "source ~/.config/fish/config.fish && clear";
+      redesktop = "kquitapp5 plasmashell && kstart5 plasmashell";
+      pulsefix = "pulseaudio --kill; pulseaudio --start";
+    };
+  };
+
+  # TODO -- port from Xonsh config
+  # $MANPAGER = "less -X"
+  # $LESS = "--ignore-case --QUIET --RAW-CONTROL-CHARS"
+  #
+  #
+  # if $TERM == "xterm-kitty":
+  #     # Wrap ssh with environment variable because servers tend to deal poorly with kitty
+  #     def xterm_ssh(args):
+  #         $TERM="xterm-256color" ssh @(args)
+  #
+  #     aliases["ssh"] = xterm_ssh
+}