Merge pull request #2828 from r3dDoX/master

removed a hardcoded 'origin' in git.zsh and added new function for number of commits ahead of remote

lib/git.zsh

@@ -54,11 +54,19 @@ git_remote_status() {
 
 # Checks if there are commits ahead from remote
 function git_prompt_ahead() {
-  if $(echo "$(command git log origin/$(current_branch)..HEAD 2> /dev/null)" | grep '^commit' &> /dev/null); then
+  if $(echo "$(command git log @{upstream}..HEAD 2> /dev/null)" | grep '^commit' &> /dev/null); then
     echo "$ZSH_THEME_GIT_PROMPT_AHEAD"
   fi
 }
 
+# Gets the number of commits ahead from remote
+function git_commits_ahead() {
+  if $(echo "$(command git log @{upstream}..HEAD 2> /dev/null)" | grep '^commit' &> /dev/null); then
+    COMMITS=$(command git log @{upstream}..HEAD | grep '^commit' | wc -l | tr -d ' ')
+    echo "$ZSH_THEME_GIT_COMMITS_AHEAD_PREFIX$COMMITS$ZSH_THEME_GIT_COMMITS_AHEAD_SUFFIX"
+  fi
+}
+
 # Formats prompt string for current git commit short SHA
 function git_prompt_short_sha() {
   SHA=$(command git rev-parse --short HEAD 2> /dev/null) && echo "$ZSH_THEME_GIT_PROMPT_SHA_BEFORE$SHA$ZSH_THEME_GIT_PROMPT_SHA_AFTER"