Support wl-copy from the Wayland clipboard utilities

Author: abrenk

README.md

@@ -118,7 +118,8 @@ $ sudo port install tmux-pasteboard
 
 ### Linux
 
--   `xsel` (recommended) or `xclip`.
+-   `xsel` (recommended) or `xclip` (for X).
+-   `wl-copy` from [wl-clipboard](https://github.com/bugaevc/wl-clipboard) (for Wayland)
 
 If you have `tmux` 1.5 or newer and are using `xterm`, the <kbd>y</kbd> in
 `copy-mode` and mouse selection will work without `tmux-yank`. See the

scripts/helpers.sh

@@ -148,6 +148,8 @@ clipboard_copy_command() {
         fi
     elif command_exists "clip.exe"; then # WSL clipboard command
         echo "clip.exe"
+    elif command_exists "wl-copy"; then # wl-clipboard: Wayland clipboard utilities
+        echo "wl-copy"
     elif command_exists "xsel"; then
         local xsel_selection
         if [[ $mouse == "true" ]]; then