Adds fish config as home manager module

home/modules/fish/default.nix

@@ -0,0 +1,45 @@
+{
+  programs.fish = {
+    enable = true;
+
+    functions = {
+      ff = ''
+        set RG_PREFIX "rg --column --line-number --no-heading --color=always --smart-case "
+        set INITIAL_QUERY "$argv"
+        fzf --ansi --disabled --query "$INITIAL_QUERY" \
+       	  --bind "start:reload:$RG_PREFIX {q}" \
+      	  --bind "change:reload:sleep 0.1; $RG_PREFIX {q} || true" \
+          --delimiter : \
+          --preview 'bat --color=always {1} --highlight-line {2}' \
+          --preview-window 'up,60%,border-bottom,+{2}+3/3,~3' \
+          --bind 'enter:become(nvim {1} +{2})'
+      '';
+      fish_greeting = "fortune -a";
+    };
+
+    interactiveShellInit = ''
+      fish_config theme choose "Rosé Pine"
+
+      set hn (prompt_hostname)
+      set fish_cursor_default     block      blink
+      set fish_cursor_insert      line       blink
+      set fish_cursor_replace_one underscore blink
+      set fish_cursor_visual      block
+      set fish_vi_force_cursor 1
+      fish_vi_key_bindings
+
+      fish_add_path /run/current-system/sw/bin
+      fish_add_path /opt/homebrew/bin
+
+      fnm env --use-on-cd --shell fish | source
+    '';
+
+    shellAbbrs = {
+      lg = "lazygit";
+      g = "git";
+      frc = "source ~/.config/fish/**/*.fish";
+    };
+  };
+
+  home.file.".config/fish/themes".source = ./themes;
+}