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cli: run command setup before fallback prompts

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#10,043 0 commenti 0 reazioni 1 assegnatario Vedi su GitHub

I maintainer di solito rispondono entro 1 giorno

@effect-bot ci sta già lavorando.

Dal 28/10/2026.

  • #10074 di @effect-bot — integrata

Valutazione

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Descrizione

What is the problem this feature would solve?

Flag.withFallbackPrompt asks its question while flags are parsed, which happens before any Command.provide* hook runs. So a command cannot show anything before its first question: no introduction, no notice, no consent question that must come first. Reproduced on 4.0.7:

const ask = (name: string) =>
  Flag.String(name).pipe(Flag.withFallbackPrompt(Prompt.String({ message: `${name}?` })))

const demo = Command.make("demo", { name: ask("name"), dir: ask("dir") }, (input) =>
  Console.log(input)
).pipe(Command.provideEffectDiscard(Console.log("Welcome to demo")))

Run without flags, both questions appear before Welcome to demo, and if the second prompt is cancelled the welcome never prints. To keep an introduction first today, a command has to drop fallback prompts and ask inside its handler, re-implementing the flag-then-prompt-then-fail logic that withFallbackPrompt now covers, including the canPrompt check from #9876.

What is the feature you are proposing to solve the problem?

A hook that runs after parsing has succeeded and before any fallback prompt, for example:

Command.beforePrompts(Console.log("Welcome to demo"))

Parse errors would still be reported before it runs, so a mistyped flag never shows the introduction, and fallback prompts would follow it in declaration order. It would run once per invocation, and also when every value was given as a flag, so the introduction does not depend on whether anything is asked.

What alternatives have you considered?
  • Running the existing Command.provide* hooks before fallback prompts: simpler to describe, but it changes ordering for every command that uses them, for example opening a resource before the user has answered anything.
  • Prompting inside the handler: what we do today; it gives up withFallbackPrompt and its new canPrompt handling.
  • Printing the introduction before Command.run: it would then also appear for --help, --version and parse errors.
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