made default-command use the value of default-shell

.tmux.conf

@@ -28,9 +28,6 @@ bind e new-window -n '~/.tmux.conf.local' "sh -c '\${EDITOR:-vim} ~/.tmux.conf.l
 # reload configuration
 bind r source-file ~/.tmux.conf \; display '~/.tmux.conf sourced'
 
-# see https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard
-if 'type -p reattach-to-user-namespace > /dev/null 2>&1' 'set -g default-command "exec $SHELL... 2> /dev/null & reattach-to-user-namespace $SHELL -l"'
-
 
 # -- display -------------------------------------------------------------------
 
@@ -134,7 +131,7 @@ bind -t vi-copy H start-of-line
 bind -t vi-copy L end-of-line
 
 # copy to Mac OSX pasteboard
-if -b 'type -p reattach-to-user-namespace > /dev/null 2>&1' 'bind y run "tmux save-buffer - | reattach-to-user-namespace pbcopy"'
+if -b 'command -v reattach-to-user-namespace > /dev/null 2>&1' 'bind y run "tmux save-buffer - | reattach-to-user-namespace pbcopy"'
 
 
 # -- user defined overrides ----------------------------------------------------
@@ -1012,6 +1009,13 @@ run 'cut -c3- ~/.tmux.conf | sh -s _apply_configuration'
 # }
 #
 # _apply_configuration() {
+#
+#   # see https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard
+#   if command -v reattach-to-user-namespace > /dev/null 2>&1; then
+#     default_shell="$(tmux show -gv default-shell)"
+#     tmux set -g default-command "exec $default_shell... 2> /dev/null & reattach-to-user-namespace $default_shell -l"
+#   fi
+#
 #   _apply_overrides
 #   _apply_bindings
 #   _apply_theme