Stuff

Random apps and stuff.

Requirements

• Xcode 27+ (a full Xcode.app, not the Command Line Tools)
• iOS 26.0+
• mise pins Tuist, SwiftFormat, and Ruby. ./ide --bootstrap installs it for you (see below).

Getting started

On a fresh machine, run the one-shot bootstrap. It checks that Xcode is installed and selected. If mise is missing, it installs mise via the official installer (no Homebrew required). It installs the pinned tools (Tuist, SwiftFormat, Ruby). Then it sets Git hooks, runs sync-agents --install, and generates the Xcode project:

# One-shot setup for a new laptop (add -i to fetch Tuist package deps,
# --team-id ABCDE12345 for on-device signing — see below)
./ide --bootstrap

When bootstrap installs mise, it also adds mise activate to your shell rc (zsh/bash). Then mise and the pinned tools are on PATH in new terminals. Restart your shell (or source ~/.zshrc) afterwards. On other shells, add activation manually per the mise docs.

When mise is already installed, regenerate:

# Generate the Xcode project (also sets Git hooks and runs sync-agents --install)
./ide

# Or install Tuist package dependencies first, then generate
./ide -i

If mise is not found, ./ide without --bootstrap fails fast and points you at ./ide --bootstrap. If you manage mise yourself, run brew install mise (or the official installer). Then run mise install.

Run tests with ./test (or open the generated workspace in Xcode). With no arguments, ./test runs only the bundles your changes affect. It uses the simulator this checkout owns. ./simulator creates that device on its first run and boots it on every run. It streams progress while tests run:

./test                  # just what your change affects
./test WhereCoreTests   # one bundle
./test --all            # the whole unit suite
./test --snapshots      # the image-snapshot suite
./test --everything     # both CI suites in one local run

See ./test --help for the rest, including --timings and --review for reading a snapshot run.

Each checkout gets a device of its own (a second clone, a worktree, and so on). Two runs on one machine never fight over booting, installing to, or erasing the same simulator. ./simulator --list shows devices with their owning checkouts. ./simulator --prune (--dry-run to preview) cleans up after a checkout you deleted. See ./simulator --help.

Codex-managed worktrees use the checked-in local environment at .codex/environments/environment.toml. Setup fetches origin/main and warns without changing the checkout when its HEAD does not contain the latest main. The Update to latest main toolbar action safely fast-forwards a checkout directly behind main. It refuses divergent feature history. On macOS the environment also runs ./ide --bootstrap --no-open. That hydrates the checkout's Git LFS snapshot references before generating the project. It offers affected tests and format lint actions. On cleanup it removes only that checkout's simulator. .worktreeinclude copies the gitignored .mise.local.toml signing override from the source checkout into each new managed worktree.

Where's production architecture is checked with Bumper Bowling through the root Swift package:

./test --architecture-only

Normal ./test invocations also run these architecture checks before other tests. The executable configuration is in BumperBowling.swift. The enforced invariants and repair guidance are cataloged in .bumper/RULES.md.

To see where build and test time goes, run ./profile. It prints setup/build/test walls, the slowest build phases and tests, slow type-check sites, and per-phase snapshot capture costs. The default reuses unit-build products for the snapshot build. --ci-shape instead gives each scheme cold DerivedData like its independent CI job. It only reports. It never fails on slow numbers. See ./profile --help for the remaining scope, destination, and threshold flags.

CI assigns snapshot suites to isolated workers. Each worker runs its assigned suites serially on one simulator. Multiple snapshot simulators on one Mac contend for the same render server. Do not run snapshots concurrently locally.

To hunt down flaky tests, run ./flaky. It runs the whole suite several times. Then it tight-loops (in isolation) any test that ever failed. It records the tests that both pass and fail (with flake counts) in FLAKY_TESTS.md. Like ./profile, it is report-only. See ./flaky --help for flags (--suite-runs, --iterations, --device/--os, --no-update, --top).

To download every artifact from a CircleCI job, pass its UUID or details URL to ./circleci-artifacts. It uses the authenticated CircleCI CLI and stores downloads under .build/circleci-artifacts/ by default. See ./circleci-artifacts --help to choose another destination or open it in Finder after downloading.

Use ./snapshot-shards check to validate the deterministic snapshot assignment. Use ./snapshot-shards balance --junit PATH to propose a new assignment from downloaded timing artifacts. Pass several --junit PATH arguments to use median durations from several pipelines. Use ./snapshot-shards balance --shards COUNT --junit PATH --write to change the shard count. Set the snapshot job parallelism to the planned count plus one intake worker. The intake worker stops after checkout when it has no new suites. New suites run on the intake worker until rebalancing adds them to the plan. CI rejects a worker-count mismatch. CI also rejects a snapshot worker that does not execute exactly its assigned suites.

The ./ide script sets core.hooksPath to .githooks. The pre-commit hook formats staged Swift with SwiftFormat and runs ./sync-agents --git-add. Generated Claude files stay in sync with AGENTS.md.

Signing for on-device builds

The checked-in project has no development team. Building to a simulator works for everyone. Nothing machine-specific lands in Git. To build to a physical device, supply your Apple Developer Team ID.

Project.swift reads it from the TUIST_DEVELOPMENT_TEAM environment variable. When present, it stamps the value into the generated project as DEVELOPMENT_TEAM. The value lives in .mise.local.toml, a local, gitignored mise config. mise exec -- tuist generate (i.e. ./ide) picks it up automatically. Your team survives every regeneration. When no team is set (CI, fresh clones), no DEVELOPMENT_TEAM is written. Xcode behaves as before.

Set it once:

# Writes TUIST_DEVELOPMENT_TEAM to .mise.local.toml, then regenerates
./ide --team-id ABCDE12345

Find your Team ID in Xcode › Settings › Accounts (the "Team ID" column) or at developer.apple.com/account under Membership details. You can also edit .mise.local.toml by hand:

[env]
TUIST_DEVELOPMENT_TEAM = "ABCDE12345"

Project structure

Package.swift       Local Swift package (StuffCore, LifecycleKit, WhereCore, WhereUI, TestHostSupport, …)
BumperBowling.swift Executable Where architecture policy
.bumper/            Repo-owned Bumper shapes, rules, tests, and catalog
Project.swift       Tuist manifest (Where app, StuffTestHost, test bundles → SPM)
Tuist.swift         Tuist configuration
.mise.toml          Pins the Tuist, SwiftFormat, and Ruby versions
.mise.local.toml    Local mise overrides, gitignored (e.g. TUIST_DEVELOPMENT_TEAM)
.swiftformat        SwiftFormat rules
.codex/             Codex managed-worktree setup, cleanup, and actions
.worktreeinclude    Ignored local files copied into Codex-managed worktrees
ide                 Dev script – bootstrap (mise + tools), hooks, sync-agents, tuist generate
swiftformat         Run SwiftFormat via mise (default: format `.`)
sync-agents         Sync AGENTS.md → CLAUDE.md and .claude/skills/
simulator           Resolve/create this checkout's simulator, boot it, print its UDID
worktree            Check or safely fast-forward a checkout against origin/main
profile             Report build/test hot spots (see `./profile --help`)
flaky               Detect flaky tests, update FLAKY_TESTS.md (see `./flaky --help`)
circleci-artifacts   Download every artifact for a CircleCI job
snapshot-shards      Validate and rebalance snapshot suite assignments
FLAKY_TESTS.md      Flaky tests and their flake counts (generated by `./flaky`)
TODOs.md            Cross-area backlog — and the format every TODOs.md follows
INBOX.md            Raw, unverified notes awaiting triage into a TODOs.md
MODULE_AUDIT.md     Dated module inventory and themes — derived, carries no TODOs
.githooks/          Git hooks (pre-commit)
.cursor/            Cloud agent environment (environment.json + install.sh)
.agents/            Agent skills — repo-owned plus the external manifest
AGENTS.md           Repository shape for AI agents
Shared/             Shared modules (Broadway, Periscope, LifecycleKit, …) — one
                    folder each, carrying its own README.md and AGENTS.md
Where/              The Where app, its modules, and its tests — same shape

Acknowledgements

The Where module bundles offline region polygons under Where/RegionKit/Sources/Resources/regions/. US state boundaries come from eric.clst.org/tech/usgeojson (gz_2010_us_040_00_5m.json), converted from the US Census Bureau Cartographic Boundary Files. US Government works are in the public domain. See Where/RegionKit/README.md for per-file provenance.

License

Apache 2.0 – see LICENSE.