Add deprecation

Author: derekprior

README.md

@@ -219,7 +219,7 @@ configuration:
 [Ruby](https://www.ruby-lang.org/en/) configuration:
 
 * Add trusted binstubs to the `PATH`.
-* Load the ASDF version manager, falling back to rbenv if not installed.
+* Load the ASDF version manager.
 
 Shell aliases and scripts:
 

zsh/configs/post/path.zsh

@@ -5,6 +5,14 @@ PATH="$HOME/.bin:/usr/local/sbin:$PATH"
 if [ -d "$HOME/.asdf" ]; then
   . $HOME/.asdf/asdf.sh
 elif command -v rbenv >/dev/null; then
+  if [ -z $SILENCE_RBENV_DEPRECATION ]; then
+    echo "The thoughtbot dotfiles have deprecated the use of rbenv in favor"\
+         "of asdf (https://github.com/asdf-vm/asdf) and will be removed on or"\
+         "after December 8, 2017.  Migrate to asdf or export"\
+         "SILENCE_RBENV_DEPRECATION=1 in your local dotfiles to silence this"\
+         "deprecation."
+  fi
+
   eval "$(rbenv init - --no-rehash)"
 fi