Q: Is there a way to fail if unknown flags/arguments are passed?

例に示されている cli/dispatch* エントリーポイントから始め、未定義の引数がディスパッチされた結果のエントリになるまでの流れを追跡します。未知のフラグに対する strict-mode の期待される動作を定義し、次にタイプミスのケースのカバレッジを追加して、有効なフラグが引き続き機能することを確認します。

Hi,

If the user passes an undefined flag is there a way to fail the cli/dispatch?

I assume that is a design choice to accept flags which have not been defined, but in some cases might be risky if fore example someone has a typo in a flag.

For example look at the following (contrived) example:

;; this command deletes the given argument
(def delete identity)

(cli/dispatch*
 {:command #'delete
  :flags ["-v, --verbose" "Increases verbosity"
          "--dry-run"     "Simulate but do not action"
          "--input FILE" "Specify the input file/folder"
          "--env=<dev|prod|test>" {:doc "Select an environment" :default "prod"}]}
;; typo in --dryrun (the correct should be --dry-run)
 ["--input" "all-my-data" "--dryrun"])

;; => {:lambdaisland.cli/sources
;;     {:env "--env=<dev|prod|test> (default value)",
;;      :input "--input command line flag"},
;;     :env "prod",
;;     :lambdaisland.cli/argv [],
;;     :input "all-my-data",
;;     :dryrun 1}

In this example the user might thing that he provided the --dryrun argument, the dispatcher will just dispatch as a new flag ignoring the fact that it was an unintentional mistake and because delete doesn't see the flag :dry-run true it will perform the actual delete.

Is there a way to add a :strict-mode true and fail on undefined flags?