improve git prompt

scripts/git.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+_git () {
+  if git branch --show-current > /dev/null 2>&1
+  then
+    _BRANCH="$(git branch --show-current)"
+    _MODIFIED="$(grep -o "M" <<< "$(git status --short)" | grep -c .)"
+    _UNTRACKED="$(grep -o "??" <<< "$(git status --short)" | grep -c .)"
+    _ORIGIN="$(git remote show)"
+    _AHEAD=$(git rev-list --left-right --count "$_BRANCH"..."$_ORIGIN"/"$_BRANCH" | cut -f 1)
+    _BEHIND=$(git rev-list --left-right --count "$_BRANCH"..."$_ORIGIN"/"$_BRANCH" | cut -f 2)
+    printf "  %s " "$(git branch --show-current)"
+    if (( _MODIFIED == 0 )) && (( _UNTRACKED == 0 )) && (( _AHEAD == 0 )) && (( _BEHIND == 0 ))
+    then
+      printf ""
+      exit 0
+    fi
+    if (( _MODIFIED >= 0 ))
+    then
+      printf "✗%s " "$_MODIFIED"
+    fi
+    if (( _UNTRACKED >= 0 ))
+    then
+      printf "★%s " "$_UNTRACKED"
+    fi
+    if (( _AHEAD >= 0 )); then
+      printf "%s " "$_AHEAD"
+    fi
+    if (( _BEHIND >= 0 )); then
+      printf "%s" "$_BEHIND"
+    fi
+  fi
+}