### Build and Setup GrotTrack from Source

Source: https://m7kni.io/grotTrack

Commands to clone the repository, install the task runner, and initialize the project environment.

```bash
brew install just

git clone https://github.com/rknightion/grotTrack.git
cd grotTrack
just setup
open GrotTrack.xcodeproj
```

--------------------------------

### Install just via Homebrew

Source: https://m7kni.io/grotTrack/building

Prerequisite installation command for the `just` command runner, required for the build tasks.

```sh
brew install just
```

--------------------------------

### Build from command line

Source: https://m7kni.io/grotTrack/building

Builds the app from the command line using the `just build` recipe.

```sh
just build
```

--------------------------------

### Build and package the extension with just commands

Source: https://m7kni.io/grotTrack/extension

Commands to build the extension for unpacked output and create an upload-ready zip. The unpacked output is placed in grot-track-extension/.output/chrome-mv3/ and the zip in grot-track-extension/.output/.

```sh
just build-extension # unpacked output: grot-track-extension/.output/chrome-mv3/
just extension-zip   # upload-ready zip in grot-track-extension/.output/
```

--------------------------------

### Project directory structure

Source: https://m7kni.io/grotTrack/contributing

Overview of the GrotTrack repository layout, including Swift source directories, the native host CLI, test suites, and the Chrome extension.

```text
GrotTrack/                 Main app source
├── Models/                SwiftData @Model classes
├── ViewModels/             @Observable view models
├── Services/               Core services (tracking, screenshots, native messaging, ...)
├── Views/                  SwiftUI views, grouped by feature area
└── Utilities/              Extensions, shared constants, the Chrome host installer
GrotTrackNativeHost/        Native messaging host CLI entry point
GrotTrackTests/             Unit tests (XCTest, run against the app as test host)
grot-track-extension/       Chrome extension (WXT / TypeScript)
project.yml                 XcodeGen project definition — regenerate after editing
arch.txt                    Hand-maintained architecture document
```

--------------------------------

### Lint the codebase

Source: https://m7kni.io/grotTrack/building

Runs the strict lint recipe. CI treats a lint failure as a failed build.

```sh
just lint
```

--------------------------------

### Run all tests

Source: https://m7kni.io/grotTrack/building

Runs the test suite with `just test`.

```sh
just test
```

--------------------------------

### Storage directory layout

Source: https://m7kni.io/grotTrack/architecture

Shows the directory structure under ~/Library/Application Support/GrotTrack/ with the SwiftData database, screenshots, thumbnails, and exports.

```plaintext
GrotTrack.store          — SwiftData database (SQLite-backed)
Screenshots/YYYY-MM-DD/  — full-resolution WebP screenshots
Thumbnails/YYYY-MM-DD/   — WebP thumbnails
Exports/                 — exported reports and LLM evidence bundles
```

--------------------------------

### Generate and open Xcode project

Source: https://m7kni.io/grotTrack/building

Generates the Xcode project from `project.yml` and opens it. Re-run after `project.yml` changes or when files are added/removed under a target's `sources`.

```sh
just xcodeproj
open GrotTrack.xcodeproj
```

--------------------------------

### Run a single test class or method

Source: https://m7kni.io/grotTrack/building

Runs a specific test class or method by adding `-only-testing` to the `just test` command.

```sh
just test GrotTrackTests/ActivityTrackerTests
```

--------------------------------

### ChromeHostManifest JSON for GrotTrack native messaging host

Source: https://m7kni.io/grotTrack/native-messaging

The manifest file written by ChromeExtensionInstaller with prettyPrinted and sortedKeys JSON encoding. It specifies the allowed extension origin, host name, path to the native host binary, and the stdio transport type. The name must match the identifier passed to chrome.runtime.connectNative in background.ts.

```json
{
  "allowed_origins": ["chrome-extension://<extension-id>/"],
  "description": "GrotTrack native messaging host for browser tab tracking",
  "name": "com.grottrack.tabtracker",
  "path": "/Applications/GrotTrack.app/Contents/MacOS/GrotTrackNativeHost",
  "type": "stdio"
}
```

--------------------------------

### Define TabMessage interface and Swift BrowserTabMessage struct

Source: https://m7kni.io/grotTrack/native-messaging

Defines the message shape exchanged between the extension and the native host. The TypeScript interface is built by background.ts and sent via port.postMessage(message); the Swift struct decodes the same JSON with title and url required and the rest optional.

```ts
interface TabMessage {
  type: 'activeTab';
  title: string;
  url: string;
  tabId: number;
  windowId: number;
  timestamp: number;   // Date.now(), i.e. milliseconds since epoch
}
```

```swift
struct BrowserTabMessage: Codable, Sendable {
    let type: String?
    let title: String
    let url: String
    let tabId: Int?
    let windowId: Int?
    let timestamp: Double?
}
```

--------------------------------

### Broadcast tab data with NSDistributedNotificationCenter

Source: https://m7kni.io/grotTrack/native-messaging

The NativeMessageHost uses this call to broadcast decoded tab data to the main application via a same-machine IPC mechanism.

```swift
DistributedNotificationCenter.default().postNotificationName(
    NSNotification.Name(GrotTrackIPC.browserTabNotification),
    object: nil,
    userInfo: userInfo as [AnyHashable: Any],
    deliverImmediately: true
)
```

--------------------------------

### Chrome native messaging wire format

Source: https://m7kni.io/grotTrack/native-messaging

Chrome's native messaging framing: a 4-byte little-endian UInt32 length prefix followed by that many bytes of UTF-8 JSON. NativeMessageHost.readMessage() implements this protocol, rejecting lengths of 0 or >= 1,000,000 and treating short reads as stdinClosed or incompleteRead.

```text
[4 bytes: little-endian UInt32 length][N bytes: UTF-8 JSON payload]
```

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