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feat(app): make -json opt-in via App.JSON (v1.3.0)

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App now registers -json only when App.JSON is true, so a CLI whose
commands do not use cli.Emit never advertises a flag it cannot honor.
Driven by the first real consumer (evpnc), whose commands print text
directly and are not yet converted to Emit. The example opts in
(JSON: true). Backward-additive: existing App users that want -json set
JSON: true.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Pim van Pelt
2026-06-05 22:18:27 +02:00
parent 9e0a98ed07
commit 496557858d
3 changed files with 17 additions and 7 deletions
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docs/design.md
+4 -3
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@@ -7,7 +7,7 @@ SPDX-License-Identifier: Apache-2.0
| | |
| --- | --- |
| **Status** | Describes shipped behavior as of `v1.2.0` |
| **Status** | Describes shipped behavior as of `v1.3.0` |
| **Author** | Pim van Pelt `<pim@ipng.ch>` |
| **Last updated** | 2026-06-05 |
| **Audience** | Contributors, and authors of CLIs built on this library |
@@ -95,8 +95,9 @@ or JSON from the same code.
**FR-5 `App` entry point**
- **FR-5.1** `App` MUST register `-color`, `-json`, `-version`, and `-server`
(only when a server is configured).
- **FR-5.1** `App` MUST register `-color` and `-version`; `-server` only when a
server is configured; and `-json` only when the app opts in (its commands use
`Emit`), so a CLI never advertises a flag it cannot honor.
- **FR-5.2** `App` MUST NOT dial anything; the client is built in a caller's
`Connect` callback.
- **FR-5.3** `-version` MUST print and exit without connecting.