Nixify fish config

Note that the home manager module isn't used here since the resulting
config.fish made fish noticeably slower on startup.

configuration.nix

@@ -58,6 +58,15 @@
     };
   };
 
+  environment.sessionVariables = {
+    EDITOR = "nvim";
+    VISUAL = "nvim";
+    GIT_DISCOVERY_ACROSS_FILESYSTEM = "1";
+    FZF_DEFAULT_COMMAND = "rg --files --no-ignore --hidden --follow --glob \"!.git/*\"";
+    FZF_DEFAULT_OPTS = "--height 40% --reverse --border --color=16";
+    NODE_OPTIONS = "--max_old_space_size=16384";
+  };
+
   services.vnstat.enable = true;
   services.tumbler.enable = true;
   security.rtkit.enable = true;
@@ -72,6 +81,12 @@
   programs.fish.enable = true;
   users.defaultUserShell = pkgs.fish;
   environment.shells = with pkgs; [ fish ];
+  programs.fish.shellAliases = {
+    ls = "exa --group-directories-first -I 'lost+found'";
+    tree = "exa --group-directories-first --all --long --tree -I 'node_modules|.git|public|lost+found'";
+    mv = "mv -i";
+    rg = "rg --max-columns=2000";
+  };
   programs.fish.shellAbbrs = {
     g = "git";
     ga = "git add";
@@ -170,8 +185,6 @@
       };
 
       character = {
-        #success_symbol = "[➤](red)[➤](green)[➤](blue)";
-        #error_symbol = "[➤](cyan)[➤](purple)[➤](yellow)";
         success_symbol = "[>](red)[>](green)[>](blue)";
         error_symbol = "[>](cyan)[>](purple)[>](yellow)";
         vicmd_symbol = "[<](bold green)";

modules/desktop.nix

@@ -49,6 +49,63 @@
       set preview_images true
       set preview_images_method kitty
     '';
+    xdg.configFile."fish/config.fish".text = ''
+      set -U fish_greeting ""
+
+      export PATH="$HOME/.deno/bin:$HOME/.cargo/bin:$HOME/.yarn/bin:$HOME/.local/bin:$HOME/.go/bin:$PATH"
+      export GOPATH="$HOME/.go"
+      export SSH_AUTH_SOCK = "$XDG_RUNTIME_DIR/ssh-agent.socket"
+      export TERMCMD="kitty --single-instance"
+
+      # Required to make gpg-agent work in cases like git commit
+      export GPG_TTY=(tty)
+
+      # Add color to man pages
+      set -x -U LESS_TERMCAP_md (printf "\e[01;31m")
+      set -x -U LESS_TERMCAP_me (printf "\e[0m")
+      set -x -U LESS_TERMCAP_se (printf "\e[0m")
+      set -x -U LESS_TERMCAP_so (printf "\e[01;44;30m")
+      set -x -U LESS_TERMCAP_ue (printf "\e[0m")
+      set -x -U LESS_TERMCAP_us (printf "\e[01;32m")
+
+      # Always use the default keybindings in fish
+      fish_default_key_bindings
+
+      # Convert unnecessarily large wav files to flac
+      function wav2flac
+          set ORIGINAL_SIZE (du -hs | cut -f1)
+
+          fd -e wav -x ffmpeg -i "{}" -loglevel quiet -stats "{.}.flac"
+          fd -e wav -X trash
+
+          set NEW_SIZE (du -hs | cut -f1)
+
+          echo "Done. Reduced file size from $ORIGINAL_SIZE to $NEW_SIZE"
+      end
+
+      # Convert wav/flac to opus
+      function opus
+          set ORIGINAL_SIZE (du -hs | cut -f1)
+
+          fd -e wav -e flac -x ffmpeg -i "{}" -c:a libopus -b:a 128K -loglevel quiet -stats "{.}.opus"
+          fd -e wav -e flac -X rm -I
+
+          set NEW_SIZE (du -hs | cut -f1)
+
+          echo "Done. Reduced file size from $ORIGINAL_SIZE to $NEW_SIZE"
+      end
+
+      # Always use kitty ssh since it's our default terminal
+      if string match -qe -- "/dev/pts/" (tty)
+          alias ssh="kitty +kitten ssh"
+      end
+
+      # if status is-login
+      #     if test -z "$DISPLAY" -a "$XDG_VTNR" = 1
+      #         exec Hyprland
+      #     end
+      # end
+    '';
     gtk = {
       enable = true;
       cursorTheme = {