misc: Emit warning on commands if jenv not initialised/loaded

libexec/jenv

@@ -99,9 +99,25 @@ shopt -u nullglob
 
 
 command="$1"
+
+case "$command" in
+  "completions" | "init" | "doctor" )
+    ;;
+  *)
+    if [[ "$JENV_LOADED" != "1" ]]
+    then
+      {
+        echo "Warning‘: jenv has not been initialised in the current shell, run"
+        echo '         eval "$(jenv init -)"'
+        echo
+      } >&2
+    fi
+    ;;
+esac
+
 case "$command" in
 "" | "-h" | "--help" )
-  echo -e "$(jenv --version)\n$(jenv-help)" >&2
+  echo -e "$(jenv---version)\n$(jenv-help)" >&2
   ;;
 * )
   command_path="$(command -v "jenv-$command" || true)"