add programs.tmux.enableFzf option

config.nix

@@ -47,6 +47,7 @@ let
       programs.tmux.loginShell = "${pkgs.lnl.zsh}/bin/zsh -l";
       programs.tmux.enableSensible = true;
       programs.tmux.enableMouse = true;
+      programs.tmux.enableFzf = true;
       programs.tmux.enableVim = true;
 
       programs.tmux.tmuxConfig = ''

modules/programs/tmux.nix

@@ -15,6 +15,14 @@ let
 
   tmuxOptions = concatMapStringsSep "\n" (attr: attr.text) (attrValues cfg.tmuxOptions);
 
+  fzfTmuxSession = pkgs.writeScript "fzf-tmux-session" ''
+    #! ${stdenv.shell}
+    set -e
+
+    session=$(tmux list-sessions -F '#{session_name}' | fzf --query="$1" --exit-0)
+    tmux switch-client -t "$session"
+  '';
+
 in {
   options = {
 
@@ -44,6 +52,15 @@ in {
       '';
     };
 
+    programs.tmux.enableFzf = mkOption {
+      type = types.bool;
+      default = false;
+      example = true;
+      description = ''
+        Enable fzf keybindings for selecting sessions and panes.
+      '';
+    };
+
     programs.tmux.enableVim = mkOption {
       type = types.bool;
       default = false;
@@ -102,6 +119,11 @@ in {
       set -g terminal-overrides 'xterm*:smcup@:rmcup@'
     '';
 
+    programs.tmux.tmuxOptions.fzf.text = mkIf cfg.enableFzf ''
+      bind-key -n M-p run "tmux split-window -p 40 -c '#{pane_current_path}' 'tmux send-keys -t #{pane_id} \"$(fzf -m | paste -sd\\  -)\"'"
+      bind-key -n M-s run "tmux split-window -p 40 'tmux send-keys -t #{pane_id} \"$(${fzfTmuxSession})\"'"
+    '';
+
     programs.tmux.tmuxOptions.vim.text = mkIf cfg.enableVim (''
       setw -g mode-keys vi
 

modules/system/write-text.nix

@@ -22,8 +22,8 @@ in
     };
 
     text = mkOption {
-      default = null;
-      type = types.nullOr types.lines;
+      type = types.lines;
+      default = "";
       description = ''
         Text of the file.
       '';
@@ -50,7 +50,7 @@ in
 
   config = {
 
-    source = mkIf (config.text != null) (mkDefault sourceDrv);
+    source = mkIf (config.text != "") (mkDefault sourceDrv);
 
   };
 }