treewide: move defaults to dedicated folder

defaults/tmux.nix

@@ -0,0 +1,58 @@
+{
+  lib,
+  config,
+  ...
+}:
+
+let
+  name = "tmux";
+  cfg = config.nixowos.cli.${name};
+in
+{
+  options.nixowos.cli.${name} = {
+    enable = lib.mkEnableOption name;
+  };
+
+  config = lib.mkIf cfg.enable {
+    programs.tmux = lib.mkDefault {
+      enable = true;
+
+      # this is a sin committed for ergonomics
+      # since "1" and "0" are quite far apart on most keyboards
+      baseIndex = 1;
+
+      keyMode = "vi";
+
+      # https://unix.stackexchange.com/questions/608142/whats-the-effect-of-escape-time-in-tmux
+      escapeTime = 50;
+
+      clock24 = true;
+
+      extraConfig = /* sh */ ''
+        set -g mouse on
+
+        # open new shells in the same working directory
+        bind '"' split-window -c "#{pane_current_path}"
+        bind % split-window -h -c "#{pane_current_path}"
+        bind c new-window -c "#{pane_current_path}"
+
+        ###### STYLING
+
+        set -g status-style 'fg=pink'
+
+        setw -g window-status-style 'fg=pink bg=black'
+        setw -g window-status-format ' #I #[fg=white]#W #[fg=pink]#F '
+
+        setw -g window-status-current-style 'fg=black bg=pink'
+        setw -g window-status-current-format ' #I #W #F '
+
+        set -g message-style 'fg=black bg=pink'
+
+        set -g mode-style 'fg=black bg=pink'
+
+        set -g pane-border-style 'fg=grey'
+        set -g pane-active-border-style 'fg=pink'
+      '';
+    };
+  };
+}