tmux - move config to XDG compliant location

[peterhoeg]

Issue description

tmux 3.1b supports the hardcoded location ~/.config/tmux/tmux.conf in addition to ~/.tmux.conf but the next version will honour $XDG_CONFIG_DIR so let's start using that instead.

I'll self-assign but if anyone else wants to, feel free.

@marsam @jorsn

[peterhoeg]

https://github.com/tmux/tmux/blob/master/Makefile.am#L14-L16

[teto]

XDG supports always gets a hourra from me. Go ahead and maybe add the change behind a stateVersion check.

[ambroisie]

@peterhoeg the version on 20.09 is now 3.1c, what else is needed to add support for this?

[marsam]

A patch for this could be:

--- a/modules/programs/tmux.nix
+++ b/modules/programs/tmux.nix
@@ -335,10 +335,9 @@ in
         };
       })
 
-      # config file ~/.tmux.conf
-      { home.file.".tmux.conf".text = mkBefore tmuxConf; }
+      { xdg.configFile."tmux/tmux.conf".text = mkBefore tmuxConf; }
       (mkIf (cfg.plugins != []) configPlugins)
-      { home.file.".tmux.conf".text = mkAfter cfg.extraConfig; }
+      { xdg.configFile."tmux/tmux.conf".text = mkAfter cfg.extraConfig; }
     ])
   );
 }

but I'd wait until 3.2 is released because it adds $XDG_CONFIG_HOME to the search paths tmux/tmux@f87be8d, otherwise it would break if anyone sets xdg.configHome to a different path.

[NickCao]

Now that tmux 3.2 has been released, maybe we can make some progess?
tmux: 3.1c -> 3.2