fishy: fix one-level directory bug and bad array assignment in zsh 5.0.1

themes/fishy.zsh-theme

 # ZSH Theme emulating the Fish shell's default prompt.
 
 _fishy_collapsed_wd() {
-  local -a pwd=("${(s:/:)PWD/#$HOME/~}")
+  local i pwd
+  pwd=("${(s:/:)PWD/#$HOME/~}")
+  if (( $#pwd > 1 )); then
     for i in {1..$(($#pwd-1))}; do
       if [[ "$pwd[$i]" = .* ]]; then
         pwd[$i]="${${pwd[$i]}[1,2]}"
@@ -9,6 +11,7 @@ _fishy_collapsed_wd() {
         pwd[$i]="${${pwd[$i]}[1]}"
       fi
     done
+  fi
   echo "${(j:/:)pwd}"
 }