feat: fix loading && add output

use_dotenvx.sh

@@ -2,9 +2,38 @@
 
 use_dotenvx() {
   local env_file=".env.${1:-default}"
+  local dotenvx_env=()
+  local used_file=""
+
   if [ -f "$env_file" ]; then
-    eval "$(dotenvx --env "$env_file" export)"
+    dotenvx_env=(--env "$env_file")
+    used_file="$env_file"
   elif [ -f ".env" ]; then
-    eval "$(dotenvx export)"
+    used_file=".env"
+  else
+    echo "use_dotenvx: no .env file found" >&2
+    return 0
   fi
+
+  local old_env new_env added_vars
+  old_env=$(mktemp)
+  new_env=$(mktemp)
+
+  env | sort >"$old_env"
+  dotenvx run "${dotenvx_env[@]}" -- env | sort >"$new_env"
+
+  added_vars=$(comm -13 "$old_env" "$new_env" | grep '=')
+
+  if [ -n "$added_vars" ]; then
+    printf "use_dotenvx: loaded variables from %s: " "$used_file" >&2
+  fi
+
+  while IFS='=' read -r key _value; do
+    if [[ "$key" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ && "$key" != "_" && "$key" != "PKG_EXECPATH" ]]; then
+      printf "+%s " "$key" >&2
+    fi
+  done <<<"$added_vars"
+
+  echo "" >&2
+  rm -f "$old_env" "$new_env"
 }