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 hg_prompt_info pyenv_prompt_info \
rbenv_prompt_info svn_prompt_info vi_mode_prompt_info \
virtualenv_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 $HOME/.rvm/bin/rvm-prompt ] || return 1
local rvm_prompt
rvm_prompt=$(eval "$HOME/.rvm/bin/rvm-prompt $ZSH_THEME_RVM_PROMPT_OPTIONS" 2>/dev/null)
[[ "${rvm_prompt}x" == "x" ]] && return 1
echo "${ZSH_THEME_RVM_PROMPT_PREFIX:=(}${rvm_prompt}${ZSH_THEME_RVM_PROMPT_SUFFIX:=)}"
}
# 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)
}