task: Ensure compdef options only get set in zsh

office/.config/sh/alias.d/taskwarrior.sh

@@ -14,7 +14,9 @@ t() {
 # copy the `task` zsh completions over to my little alias 😉
 # FIXME: this is not very pretty and not super portable (needs ps) but
 # works for now. from here: https://unix.stackexchange.com/a/72564/414758
+if echo "$SHELL" | grep -q zsh; then
     if exist task && [ "$(ps -p $$ -o comm --no-headers)" = "zsh" ]; then compdef t=task; fi
+fi
 
 alias ta="task add"
 alias tal="task log"