Properly report deteched HEAD state

Author: apm963

src/git-status.sh

@@ -5,16 +5,21 @@ GREEN='\033[0;32m'
 CYAN='\033[1;36m'
 NC='\033[0m'
 
-UPSTREAM=${1:-'@{u}'}
-LOCAL=$(git rev-parse @)
-REMOTE=$(git rev-parse "$UPSTREAM")
-BASE=$(git merge-base @ "$UPSTREAM")
+if ! git symbolic-ref --short HEAD 2>/dev/null; then
+	echo "${CYAN}?${NC} Deteached HEAD"
+	exit 1
+fi
 
-if [ $LOCAL = $REMOTE ]; then
+UPSTREAM=${1:-'@{u}'};
+LOCAL=$(git rev-parse @);
+REMOTE=$(git rev-parse "$UPSTREAM");
+BASE=$(git merge-base @ "$UPSTREAM");
+
+if [ "${LOCAL}" = "${REMOTE}" ]; then
     echo "${GREEN}✓${NC} Up to date"
-elif [ $LOCAL = $BASE ]; then
+elif [ "${LOCAL}" = "${BASE}" ]; then
     echo "${RED}▼${NC} Pull Needed"
-elif [ $REMOTE = $BASE ]; then
+elif [ "${REMOTE}" = "${BASE}" ]; then
     echo "${CYAN}▲${NC} Push Needed"
 else
     echo "${RED}✗${NC} Diverged"