use arrays instead of piping to head and tail in fstash

Examples.md

@@ -343,13 +343,15 @@ fstash() {
     fzf --ansi --no-sort --query="$q" --print-query \
         --expect=ctrl-d,ctrl-b);
   do
-      q=$(head -1 <<< "$out")
-      k=$(head -2 <<< "$out" | tail -1)
-      sha=$(tail -1 <<< "$out" | cut -d' ' -f1)
-      [ -z "$sha" ] && continue
-      if [ "$k" = 'ctrl-d' ]; then
+    mapfile -t out <<< "$out"
+    q="${out[0]}"
+    k="${out[1]}"
+    sha="${out[-1]}"
+    sha="${sha%% *}"
+    [[ -z "$sha" ]] && continue
+    if [[ "$k" = 'ctrl-d' ]]; then
       git diff $sha
-      elif [ "$k" = 'ctrl-b' ]; then
+    elif [[ "$k" = 'ctrl-b' ]]; then
       git stash branch "stash-$sha" $sha
       break;
     else