add git-prompt plugin from olivierverdier/zsh-git-prompt

plugins/git-prompt/git-prompt.plugin.zsh

@@ -0,0 +1,60 @@
+# ZSH Git Prompt Plugin from:
+# http://github.com/olivierverdier/zsh-git-prompt
+#
+export __GIT_PROMPT_DIR=$ZSH/plugins/git-prompt
+# Initialize colors.
+autoload -U colors
+colors
+
+# Allow for functions in the prompt.
+setopt PROMPT_SUBST
+
+## Enable auto-execution of functions.
+typeset -ga preexec_functions
+typeset -ga precmd_functions
+typeset -ga chpwd_functions
+
+# Append git functions needed for prompt.
+preexec_functions+='preexec_update_git_vars'
+precmd_functions+='precmd_update_git_vars'
+chpwd_functions+='chpwd_update_git_vars'
+
+## Function definitions
+function preexec_update_git_vars() {
+    case "$2" in
+        git*)
+        __EXECUTED_GIT_COMMAND=1
+        ;;
+    esac
+}
+
+function precmd_update_git_vars() {
+    if [ -n "$__EXECUTED_GIT_COMMAND" ]; then
+        update_current_git_vars
+        unset __EXECUTED_GIT_COMMAND
+    fi
+}
+
+function chpwd_update_git_vars() {
+    update_current_git_vars
+}
+
+function update_current_git_vars() {
+    unset __CURRENT_GIT_STATUS
+
+    local gitstatus="$__GIT_PROMPT_DIR/gitstatus.py"
+    _GIT_STATUS=`python ${gitstatus}`
+    __CURRENT_GIT_STATUS=("${(f)_GIT_STATUS}")
+}
+
+function prompt_git_info() {
+    if [ -n "$__CURRENT_GIT_STATUS" ]; then
+        echo "(%{${fg[red]}%}$__CURRENT_GIT_STATUS[1]%{${fg[default]}%}$__CURRENT_GIT_STATUS[2]%{${fg[magenta]}%}$__CURRENT_GIT_STATUS[3]%{${fg[default]}%})"
+    fi
+}
+
+# Set the prompt.
+#PROMPT='%B%m%~%b$(prompt_git_info) %# '
+# for a right prompt:
+#RPROMPT='%b$(prompt_git_info)'
+RPROMPT='$(prompt_git_info)'