Update tmux config

bin/login-shell

@@ -1,12 +0,0 @@
-#! /usr/bin/env bash
-
-# Ensure that tmux windows are by default named after the shell, rather than
-# full path to the shell binary.
-shell=$(basename "$SHELL")
-
-# If reattach-to-user-namespace is not available, just run the command.
-if [ -n "$(command -v reattach-to-user-namespace)" ]; then
-  reattach-to-user-namespace -l "$shell"
-else
-  exec "$shell"
-fi

bin/safe-reattach-to-user-namespace

@@ -1,8 +0,0 @@
-#! /usr/bin/env bash
-
-# If reattach-to-user-namespace is not available, just run the command.
-if [ -n "$(command -v reattach-to-user-namespace)" ]; then
-  reattach-to-user-namespace $@
-else
-  exec "$@"
-fi

tmux.conf

@@ -8,20 +8,29 @@ set -g default-terminal "screen-256color"
 set -g detach-on-destroy on
 set -g history-limit 50000
 
-# Mouse support
-set -g mouse on # Tmux 2.1 and later
-set -g mode-mouse on
-set -g mouse-select-pane on
-set -g mouse-resize-pane on
-set -g mouse-select-window on
+# Mouse support (pre Tmux 2.1)
+if-shell -b '[ "$(echo "$(tmux -V | cut -c 6-) < 2.1" | bc)" = 1 ]' \
+    " \
+    set -g mode-mouse on; \
+    set -g mouse-resize-pane on; \
+    set -g mouse-select-pane on; \
+    set -g mouse-select-window on; \
+    "
 
-# Pre Tmux 2.1 mouse scrolling behavior
-#  - from: https://github.com/tmux/tmux/issues/145#issuecomment-151123624
-bind -n WheelUpPane if-shell -F -t = "#{mouse_any_flag}" "send-keys -M" "if -Ft= '#{pane_in_mode}' 'send-keys -M' 'select-pane -t=; copy-mode -e; send-keys -M'"
-bind -n WheelDownPane select-pane -t= \; send-keys -M
+# Mouse support (Tmux 2.1 and later)
+#  - scrolling behavior from: https://github.com/tmux/tmux/issues/145#issuecomment-151123624
+if-shell -b '[ "$(echo "$(tmux -V | cut -c 6-) >= 2.1" | bc)" = 1 ]' \
+    " \
+    set -g mouse on; \
+    bind -n WheelUpPane if-shell -F -t = \"#{mouse_any_flag}\" \"send-keys -M\" \"if -Ft= '#{pane_in_mode}' 'send-keys -M' 'select-pane -t=; copy-mode -e; send-keys -M'\"; \
+    bind -n WheelDownPane select-pane -t= \\; send-keys -M; \
+    "
 
 # Mac OS X fix for pbcopy, pbpaste, and launchctl
-set-option -g default-command "login-shell"
+if-shell -b '[ -n "$(command -v reattach-to-user-namespace)" ]' \
+    " \
+    set-option -g default-command 'reattach-to-user-namespace -l $SHELL'; \
+    "
 
 # Set window notifications
 setw -g monitor-activity on