PR #35450 - manaflow-ai/cmux

Leo: "if you could just, hot reload and test out the f***ing fix right then and there, without much fanfare at all ... and it's still like the same kind of flow, right?"

Leo-ask: ask-ffdcb76e34

What

scripts/cmux-next/try-pr.sh <PR> is one command for trying a PR. It reads the PR's diff with git (no GitHub API), sorts it with scripts/cmux-next/live_apply.py, and takes the cheapest path:

web-live: runs web-overlay.sh follow <PR>, so the running app hot-reloads the PR's web UI in seconds with no build.
no-app (CI, tests, docs) and ios-only: reports that there is nothing to try in the Mac app.
daemon, swift-live, rebuild: says why it needs a new binary (a stored property, a changed signature, a new file, a resource), and with --build requests the same fleet dev build as today, tagged pr-<N>.

--dry-run prints the verdict and the command without running it. The rules come from the live-apply study of 8,315 merged PRs: 66% of NEXT-era PRs that touch the app needed no new binary, and most of those are web changes. The hot-reload doc gets a row and a section.

Not in this PR: injecting Swift into the app itself. The view shell has live code today (#35314), but the app is not linked for it yet. For a body-only Swift change the script says it is injectable later and needs a dev build for now.

Verification

python3 -m unittest scripts/cmux-next/tests/test_live_apply.py: all 10 tests pass, including a real git range.
try-pr.sh N --dry-run --build on merged PRs: #35314 → rebuild (new files, Package.swift), #35408 → no-app, #35206 and #35205 → web-live (web-overlay.sh follow).
prepush-gate.py: no new violations.

Observed / Not run

Not run: web-overlay.sh follow on a Mac against a live app. That path is the existing, unchanged script. A real --build submission was not run either.

Changelog

none

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Summary by cubic

Adds scripts/cmux-next/try-pr.sh <PR> and live_apply.py for trying a pull request without waiting for a build when none is needed. The script reads the PR's diff with git, classifies it with live_apply.py, and takes the cheapest path: web-only changes go straight to web-overlay.sh follow for live hot-reload, CI/tests/docs changes report nothing to try, and daemon, Swift, or resource changes say why they need a new binary (with --build requesting the fleet dev build tagged pr-<N>). --dry-run prints the verdict and command without running.

Addresses review follow-ups: lockfiles, bundled scripts, and web config (like vite.config.mjs) no longer fall into no-app—the extension rule now runs after the web, resource, and Rust rules. The hot-reload doc gives honest numbers (about half of recent NEXT-era PRs need no new binary) and stops counting swift-live as needing no build. --port with no value prints usage. All 10 tests pass, including dry runs on several merged PRs.