Update tmux plugins on install

install.sh

@@ -73,13 +73,20 @@ if which git-lfs >/dev/null 2>&1 ; then
   git lfs install
 fi
 
-echo "Setting up tmux..."
-if [ -e "$HOME/.tmux/plugins/tpm" ]; then
-  pushd "$HOME/.tmux/plugins/tpm" >/dev/null
-  git pull -q origin master
-  popd >/dev/null
+if which tmux >/dev/null 2>&1 ; then
+  echo "Setting up tmux..."
+  if [ -e "$HOME/.tmux/plugins/tpm" ]; then
+    pushd "$HOME/.tmux/plugins/tpm" >/dev/null
+    git pull -q origin master
+    popd >/dev/null
+  else
+    git clone -q https://github.com/tmux-plugins/tpm "$HOME/.tmux/plugins/tpm"
+  fi
+  $HOME/.tmux/plugins/tpm/scripts/install_plugins.sh >/dev/null
+  $HOME/.tmux/plugins/tpm/scripts/clean_plugins.sh >/dev/null
+  $HOME/.tmux/plugins/tpm/scripts/update_plugin.sh >/dev/null
 else
-  git clone -q https://github.com/tmux-plugins/tpm "$HOME/.tmux/plugins/tpm"
+  echo "Skipping tmux setup because tmux isn't installed."
 fi
 
 postinstall="$HOME/.postinstall"