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zsh/.oh-my-zsh/lib/prompt_info_functions.zsh

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+# *_prompt_info functions for usage in your prompt
+#
+# Plugin creators, please add your *_prompt_info function to the list
+# of dummy implementations to help theme creators not receiving errors
+# without the need of implementing conditional clauses.
+#
+# See also lib/bzr.zsh, lib/git.zsh and lib/nvm.zsh for
+# git_prompt_info, bzr_prompt_info and nvm_prompt_info
+
+# Dummy implementations that return false to prevent command_not_found
+# errors with themes, that implement these functions
+# Real implementations will be used when the respective plugins are loaded
+function chruby_prompt_info \
+  rbenv_prompt_info \
+  hg_prompt_info \
+  pyenv_prompt_info \
+  svn_prompt_info \
+  vi_mode_prompt_info \
+  virtualenv_prompt_info \
+  jenv_prompt_info \
+  tf_prompt_info \
+{
+  return 1
+}
+
+# oh-my-zsh supports an rvm prompt by default
+# get the name of the rvm ruby version
+function rvm_prompt_info() {
+  [ -f $HOME/.rvm/bin/rvm-prompt ] || return 1
+  local rvm_prompt
+  rvm_prompt=$($HOME/.rvm/bin/rvm-prompt ${=ZSH_THEME_RVM_PROMPT_OPTIONS} 2>/dev/null)
+  [[ -z "${rvm_prompt}" ]] && return 1
+  echo "${ZSH_THEME_RUBY_PROMPT_PREFIX}${rvm_prompt}${ZSH_THEME_RUBY_PROMPT_SUFFIX}"
+}
+
+ZSH_THEME_RVM_PROMPT_OPTIONS="i v g"
+
+
+# use this to enable users to see their ruby version, no matter which
+# version management system they use
+function ruby_prompt_info() {
+  echo $(rvm_prompt_info || rbenv_prompt_info || chruby_prompt_info)
+}