-PROMPT="%{${fg[green]}%}%B%m%b%{${fg[default]}%}:\
-%{${fg[blue]}%}%B%~%b%{${fg[default]}%} \
-%(1j.%{${fg[yellow]}%}%j%{${fg[default]}%}.)%(2L.+.)%# \
-%(?..(%{${fg[red]}%}%B%?%b%{${fg[default]}%}%) )"
-
-# Allow substitutions and expansions in the prompt, necessary for vcs_info.
-setopt promptsubst
-# Load vcs_info to display information about version control repositories.
-autoload -Uz vcs_info
-# Only look for git and mercurial repositories; the only I use.
-zstyle ':vcs_info:*' enable git hg
-# Set style of vcs_info display. The current branch (green) and vcs (blue) is
-# displayed. If there is an special action going on (merge, rebase) it's also
-# displayed (red).
-zstyle ':vcs_info:*' formats \
-"(%{${fg[green]}%}%b%{${fg[default]}%}:\
-%{${fg[blue]}%}%s%{${fg[default]}%})"
-zstyle ':vcs_info:*' actionformats \
-"(%{${fg[green]}%}%b%{${fg[default]}%}/\
-%{${fg[red]}%}%a%{${fg[default]}%}:\
-%{${fg[blue]}%}%s%{${fg[default]}%})"
-# Call vcs_info as precmd before every prompt.
-prompt_precmd() {
- vcs_info
-}
-add-zsh-hook precmd prompt_precmd
+PROMPT="$green%B%m%b$default:$blue%B%~%b$default \
+%(1j.$yellow%j$default.)%# \
+%(?..($red%B%?%b$default%) )"
+
+# VCS_Info was added in 4.3.9 but it works in earlier versions too. So load it
+# if the necessary files are available in ~/.zsh/functions/vcs_info (often a
+# symbolic link to current checkout of Zsh's sources).
+if [[ $ZSH_VERSION == (4.3.<9->|4.<4->*|<5->*) ||
+ -d ~/.zsh/functions/vcs_info ]]; then
+ # Update fpath to allow loading the VCS_Info functions.
+ if [[ -d ~/.zsh/functions/vcs_info ]]; then
+ fpath=(~/.zsh/functions/vcs_info/
+ ~/.zsh/functions/vcs_info/Backends
+ $fpath)
+ fi
+
+ # Allow substitutions and expansions in the prompt, necessary for
+ # VCS_Info.
+ setopt promptsubst
+ # Load VCS_Info to display information about version control repositories.
+ autoload -Uz vcs_info
+ # Only look for git and mercurial repositories; the only I use.
+ zstyle ':vcs_info:*' enable git hg
+ # Check the repository for changes so they can be used in %u/%c (see
+ # below). This comes with a speed penalty for bigger repositories.
+ zstyle ':vcs_info:*' check-for-changes true
+
+ # Set style of VCS_Info display. The current branch (green) and VCS (blue)
+ # is displayed. If there is an special action going on (merge, rebase)
+ # it's also displayed (red). Also display if there are unstaged or staged
+ # (%u/%c) changes.
+ zstyle ':vcs_info:*' formats \
+ "($green%b%u%c$default:$blue%s$default)"
+ zstyle ':vcs_info:*' actionformats \
+ "($green%b%u%c$default/$red%a$default:$blue%s$default)"
+ # Set style for formats/actionformats when unstaged (%u) and staged (%c)
+ # changes are detected in the repository; check-for-changes must be set to
+ # true for this to work. Thanks to Bart Trojanowski
+ # (http://jukie.net/~bart/blog/pimping-out-zsh-prompt) for the idea
+ # (2010-03-11 00:20).
+ zstyle ':vcs_info:*' unstagedstr '¹'
+ zstyle ':vcs_info:*' stagedstr '²'
+
+ # Call VCS_Info as precmd before every prompt.
+ prompt_precmd() {
+ vcs_info
+ }
+ add-zsh-hook precmd prompt_precmd
+
+ # Display the VCS information in the right prompt.
+ if [[ $ZSH_VERSION == (4.3.<9->|4.<4->*|<5->*) ]]; then
+ RPROMPT='${vcs_info_msg_0_}'
+ # There is a bug in Zsh below 4.3.9 which displays a wrong symbol when
+ # ${vcs_info_msg_0_} is empty. Provide a workaround for those versions,
+ # thanks to Frank Terbeck <ft@bewatermyfriend.org> for it.
+ else
+ RPROMPT='${vcs_info_msg_0_:- }'
+ fi
+fi