Add options for customizing `chruby` segment

README.md

@@ -393,6 +393,17 @@ segment will not be displayed.
 |`POWERLEVEL9K_PUBLIC_IP_METHODS`|(dig curl wget)| These methods in that order are used to refresh your IP.|
 |`POWERLEVEL9K_PUBLIC_IP_NONE`|None|The string displayed when an IP was not obtained|
 
+##### chruby
+
+This segment shows the version of Ruby being used when using `chruby` to change your current Ruby stack.
+
+It uses `$RUBY_ENGINE` and `$RUBY_VERSION` as set by `chruby`.
+
+| Variable | Default Value | Description |
+|----------|---------------|-------------|
+|`POWERLEVEL9K_CHRUBY_SHOW_ENGINE`|true|Show the currently selected Ruby engine (e.g. `ruby`, `jruby`, `rbx`, etc)
+|`POWERLEVEL9K_CHRUBY_SHOW_VERSION`|true|Shows the currently selected engine's version (e.g. `2.5.1`)
+
 ##### rbenv
 
 This segment shows the version of Ruby being used when using `rbenv` to change your current Ruby stack.

powerlevel9k.zsh-theme

@@ -950,11 +950,24 @@ prompt_rbenv() {
 # chruby information
 # see https://github.com/postmodern/chruby/issues/245 for chruby_auto issue with ZSH
 prompt_chruby() {
-  local chruby_env
+  # Uses $RUBY_VERSION and $RUBY_ENGINE set by chruby
-  chrb_env="$(chruby 2> /dev/null | grep \* | tr -d '* ')"
+  set_default POWERLEVEL9K_CHRUBY_SHOW_VERSION true
+  set_default POWERLEVEL9K_CHRUBY_SHOW_ENGINE true
+  local chruby_label=""
+
+  if [[ "$POWERLEVEL9K_CHRUBY_SHOW_ENGINE" == true ]]; then
+    chruby_label+="$RUBY_ENGINE "
+  fi
+  if [[ "$POWERLEVEL9K_CHRUBY_SHOW_VERSION" == true ]]; then
+    chruby_label+="$RUBY_VERSION"
+  fi
+
+  # Truncate trailing spaces
+  chruby_label="${chruby_label%"${chruby_label##*[![:space:]]}"}"
+
   # Don't show anything if the chruby did not change the default ruby
-  if [[ "${chrb_env:-system}" != "system" ]]; then
+  if [[ "$RUBY_ENGINE" != "" ]]; then
-    "$1_prompt_segment" "$0" "$2" "red" "$DEFAULT_COLOR" "${chrb_env}" 'RUBY_ICON'
+    "$1_prompt_segment" "$0" "$2" "red" "$DEFAULT_COLOR" "${chruby_label}" 'RUBY_ICON'
   fi
 }