Merge pull request #2270 from michaelorr/slow-git-fix

Optionally disable git_prompt_info with git config option for very large repos

lib/git.zsh

 # get the name of the branch we are on
 function git_prompt_info() {
-  ref=$(command git symbolic-ref HEAD 2> /dev/null) || \
-  ref=$(command git rev-parse --short HEAD 2> /dev/null) || return
-  echo "$ZSH_THEME_GIT_PROMPT_PREFIX${ref#refs/heads/}$(parse_git_dirty)$ZSH_THEME_GIT_PROMPT_SUFFIX"
+  if [[ "$(git config --get oh-my-zsh.hide-status)" != "1" ]]; then
+    ref=$(command git symbolic-ref HEAD 2> /dev/null) || \
+    ref=$(command git rev-parse --short HEAD 2> /dev/null) || return
+    echo "$ZSH_THEME_GIT_PROMPT_PREFIX${ref#refs/heads/}$(parse_git_dirty)$ZSH_THEME_GIT_PROMPT_SUFFIX"
+  fi
 }