Add the branch's dirty state to the prompt.

Based on:
http://bytebaker.com/2012/01/09/show-git-information-in-your-prompt/

prompt.sh

@@ -16,11 +16,19 @@ function find_git_branch {
    done
    git_branch=''
 }
+function find_git_dirty {
+    st=$(git status 2>/dev/null | tail -n 1)
+    if [[ $st != "nothing to commit (working directory clean)" ]]
+        git_dirty=''
+    then
+        git_dirty='*'
+    fi
+}
 
-PROMPT_COMMAND="find_git_branch; $PROMPT_COMMAND"
+PROMPT_COMMAND="find_git_branch; find_git_dirty; $PROMPT_COMMAND"
 
-# Default Git enabled prompt
-# export PS1="\u@\h \w\[$txtcyn\]\$git_branch\[$txtrst\]\$ "
+# Default Git enabled prompt with dirty state
+# export PS1="\u@\h \w\[$txtcyn\]\$git_branch\[$txtylw\]\$git_dirty\[$txtrst\]\$ "
 
 # Default Git enabled root prompt (for use with "sudo -s")
 # export SUDO_PS1="\[$bakred\]\u@\h\[$txtrst\] \w\$ "