Added very basic hg scm plugin. Compared to git and svn it's very slow.

todo: look for a faster way to get the status (dirty/clean)

scm/hg.scm.zsh

@@ -0,0 +1,25 @@
+function scm_in_hg_repo () {
+    if [[ -d .hg ]]; then
+        echo 1
+    fi
+}
+
+function scm_hg_prompt_info {
+   out="$ZSH_THEME_SCM_PROMPT_PREFIX$(cat .hg/branch)$(parse_hg_dirty)$ZSH_THEME_SCM_PROMPT_SUFFIX"
+   if [[ ZSH_THEME_SCM_DISPLAY_NAME -eq 1 ]]; then
+         out="hg$out"
+   fi
+   echo $out
+}
+
+
+function parse_hg_dirty {
+    s=$(hg status 2>/dev/null)
+    if [ $s ]; then 
+        echo $ZSH_THEME_SCM_PROMPT_DIRTY
+    else 
+        echo $ZSH_THEME_SCM_PROMPT_CLEAN
+    fi
+}
+
+ZSH_THEME_SVN_NAME="hg"