remove hard-coded layout names

Makefile

@@ -0,0 +1,84 @@
+# Makefile for phbar
+#
+# Usage: make <target>
+#
+# NOTE: Never invoke this Makefile with `sudo` (e.g. `sudo make install`).
+# Running `swift build` as root corrupts `.build/` with root-owned files that
+# break subsequent non-root builds (you get "invalid access to …/DerivedSources").
+# The `install`/`uninstall` targets elevate *only* the file copy, and only when
+# the destination is not user-writable, so `sudo` is never needed from the user.
+
+# Install directory. Override with: make install BIN_DIR=/opt/homebrew/bin
+BIN_DIR ?= /usr/local/bin
+BUILD_DIR := .build/release
+BINARIES := phbar
+
+# Guard: any target that runs Swift must not run under sudo, otherwise it would
+# sprinkle root-owned files across .build/. It fails fast with a helpful message
+# instead of corrupting the build directory. Recursively-expanded (`=`) so that
+# the `$@` automatic variable resolves per-target at recipe time.
+guard_not_root = @if [ "$$(id -u)" = "0" ] && [ -n "$$SUDO_USER" ]; then \
+	echo "❌ 'make $@' must not run under sudo (it would corrupt .build/)." >&2; \
+	echo "   Run 'make install' without sudo; it elevates only the copy step." >&2; \
+	exit 1; \
+fi
+
+.PHONY: all build install clean test run uninstall reinstall help
+
+all: build
+
+# Build all targets in release mode
+build:
+	$(guard_not_root)
+	swift build -c release
+
+# Build and install binaries. Elevates only the copy when BIN_DIR isn't writable.
+install: build
+	@mkdir -p $(BIN_DIR)
+	@if [ -w "$(BIN_DIR)" ]; then CP="cp -f"; else CP="sudo cp -f"; fi; \
+	for bin in $(BINARIES); do \
+		$$CP $(BUILD_DIR)/$$bin $(BIN_DIR)/; \
+	done
+	@echo "✅ Installed $(BINARIES) to $(BIN_DIR)"
+
+# Clean build artifacts
+clean:
+	$(guard_not_root)
+	swift package clean
+
+# Run tests
+test:
+	$(guard_not_root)
+	swift test
+
+# Quick test: build, install, and verify
+run: install
+	@echo "Verifying installation..."
+	@for bin in $(BINARIES); do \
+		which $$bin > /dev/null && echo "✓ $$bin: $$($$bin --version 2>/dev/null | head -1)" || echo "✗ $$bin: not found"; \
+		done
+
+# Uninstall binaries. Elevates only the remove when BIN_DIR isn't writable.
+uninstall:
+	@if [ -w "$(BIN_DIR)" ]; then RM="rm -f"; else RM="sudo rm -f"; fi; \
+	for bin in $(BINARIES); do \
+		$$RM $(BIN_DIR)/$$bin; \
+	done
+	@echo "✅ Uninstalled $(BINARIES) from $(BIN_DIR)"
+
+# Rebuild and reinstall (clean + install)
+reinstall: clean install
+
+# Show help
+help:
+	@echo "Available targets:"
+	@echo "  make build       - Build in release mode"
+	@echo "  make install     - Build and install to $(BIN_DIR)"
+	@echo "  make clean       - Clean build artifacts"
+	@echo "  make test        - Run tests"
+	@echo "  make run         - Build, install, and verify"
+	@echo "  make uninstall   - Remove binaries from $(BIN_DIR)"
+	@echo "  make reinstall   - Clean and reinstall"
+	@echo ""
+	@echo "Override the install location with BIN_DIR, e.g.:"
+	@echo "  make install BIN_DIR=$(HOME)/.local/bin"

Package.swift

@@ -11,7 +11,7 @@ let package = Package(
 	products: [
 		// The public SDK external event recognizers depend on. Ships the
 		// `PHEventRecognizer` protocol + factory-symbol contract, nothing else.
-		.library(name: "phbarEvents", targets: ["phbarEvents"]),
+		.library(name: "phbarEvents", targets: ["phbarEvents"])
 	],
 	dependencies: [
 		.package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.2.0"),
@@ -31,10 +31,10 @@ let package = Package(
 				.product(name: "TOML", package: "swift-toml"),
 				.target(name: "phbarEvents"),
 			],
-			resources: [
-				.process("Models/Config/config.toml"),
-				.process("Models/Theme/theme.toml"),
+			exclude: [
+				"Models/PHEvent/README.md"
 			],
+			resources: [.copy("config")]
 		),
 		.testTarget(
 			name: "phbarTests",

Sources/phbar/AppDelegate.swift

@@ -1,38 +0,0 @@
-import AppKit
-
-@MainActor
-final class AppDelegate: NSObject, NSApplicationDelegate {
-	var barController: PHController!
-	var window: BarWindow!
-	private var observers: [IPCObserver] = []
-
-	init(config: PHConfig, screen: NSScreen, theme: PHTheme, blocks: [PHBlock], debug: Bool = false) {
-		super.init()
-
-		self.barController = PHController(config: config, screen: screen, theme: theme, blocks: blocks)
-		barController.debug = debug
-	}
-
-	func applicationDidFinishLaunching(_ notification: Notification) {
-		window = BarWindow(controller: barController)
-		window.orderFront(nil)
-		barController.startAutoRefresh()
-
-		// Listen for refresh notifications from `phbar refresh`.
-		let token = IPC.observe(.refresh) { [weak self] _ in
-			Task { @MainActor in
-				self?.refresh()
-			}
-		}
-		observers.append(token)
-	}
-
-	func refresh() {
-		barController.refresh()
-	}
-
-	func applicationWillTerminate(_ notification: Notification) {
-		barController.stopAutoRefresh()
-		observers.removeAll()
-	}
-}

Sources/phbar/CLI/cli+start.swift

@@ -1,60 +0,0 @@
-import AppKit
-import ArgumentParser
-import Foundation
-
-extension phbar {
-	struct start: ParsableCommand {
-		static let configuration = CommandConfiguration(
-			commandName: "start",
-			abstract: "Start the status bar."
-		)
-
-		@Flag(name: .long, help: "Display visual guides to help align elements.")
-		var debug: Bool = false
-
-		mutating func run() throws {
-			let config = try PHConfig.load()
-			let screen = try targetScreen(monitor: 0)
-			let theme = try PHTheme.load("voltage")
-
-			// NOTE: Make sure NSApp.run() runs in the main thread
-			dispatchPrecondition(condition: .onQueue(.main))
-
-			try MainActor.assumeIsolated {
-				let blocks = try PHBlock.load()
-
-				let delegate = AppDelegate(config: config, screen: screen, theme: theme, blocks: blocks, debug: debug)
-				let app = NSApplication.shared
-				app.setActivationPolicy(.accessory)
-				app.delegate = delegate
-				app.run()
-
-				throw ExitCode.success
-			}
-		}
-	}
-}
-
-// Monitor
-
-extension phbar.start {
-	private func targetScreen(monitor: Int) throws -> NSScreen {
-		let screens = NSScreen.screens
-		guard !screens.isEmpty else { throw CleanExit.message("No monitor founded") }
-
-		if monitor >= 0, monitor < screens.count {
-			return screens[monitor]
-		}
-
-		// Default: screen containing the mouse cursor
-		let mouseLocation = NSEvent.mouseLocation
-		guard
-			let screen = screens.first(where: { NSMouseInRect(mouseLocation, $0.frame, false) })
-				?? screens.first
-		else {
-			throw CleanExit.message("No monitor founded")
-		}
-
-		return screen
-	}
-}

Sources/phbar/Commands/PHBar+Install.swift

@@ -0,0 +1,69 @@
+import ArgumentParser
+import Foundation
+
+extension PHBar {
+	struct Install: ParsableCommand {
+		static let configuration = CommandConfiguration(
+			commandName: "install",
+			abstract: "Start the status bar.",
+			discussion: """
+				Launch the bar as a non-stopping background process.
+				This command is meant to be used for both testing and production.
+
+				When testing, you can provide the `--debug` flag to get visual
+				guidance that helps you configure the blocks and a verbose output from
+				the shell scripts to debug the behaviour.
+				"""
+		)
+
+		private var source: URL? {
+			Bundle.module.url(forResource: "config", withExtension: "")
+		}
+
+		private var destination: URL {
+			let environment = ProcessInfo.processInfo.environment
+
+			let homeDirectory = FileManager.default.homeDirectoryForCurrentUser
+			let standardConfigDirectory = homeDirectory.appending(path: ".config")
+			let xdgConfigDirectory = environment["XDG_CONFIG_HOME"]?.trimmingCharacters(
+				in: .whitespaces)
+			var candidateDirectory: URL
+
+			if let xdgConfigDirectory, xdgConfigDirectory.hasPrefix("/") {
+				candidateDirectory = URL(fileURLWithPath: xdgConfigDirectory)
+			} else if FileManager.default.fileExists(atPath: standardConfigDirectory.relativePath) {
+				candidateDirectory = standardConfigDirectory
+			} else {
+				candidateDirectory = homeDirectory
+			}
+
+			return candidateDirectory.appending(path: "phbar")
+		}
+
+		mutating func run() throws {
+			do {
+				guard let source else { throw PHBar.Error("Failed to locate bundled config") }
+				try FileManager.default.copyItem(at: source, to: destination)
+				try makeExecutable()
+			} catch {
+				throw PHBar.Error("Failed to create config directory", underlyingError: error)
+			}
+
+			throw CleanExit.message("Config directory created at \(destination.relativePath)")
+		}
+
+		private func makeExecutable() throws {
+			let scriptsDirectory = destination.appending(path: "scripts", directoryHint: .isDirectory)
+			let scripts = try FileManager.default.contentsOfDirectory(
+				atPath: scriptsDirectory.relativePath
+			)
+
+			for script in scripts {
+				let path = scriptsDirectory.appending(path: script)
+				var attributes: [FileAttributeKey: Any] = [:]
+				attributes[.posixPermissions] = 0o755  // rwxr-xr-x
+				try FileManager.default.setAttributes(attributes, ofItemAtPath: path.relativePath)
+			}
+		}
+	}
+}

Sources/phbar/Commands/PHBar+Refresh.swift

@@ -1,7 +1,7 @@
 import ArgumentParser
 
-extension phbar {
-	struct refresh: ParsableCommand {
+extension PHBar {
+	struct Refresh: ParsableCommand {
 		static let configuration = CommandConfiguration(
 			commandName: "refresh",
 			abstract: "Refresh the running status bar."

Sources/phbar/Commands/PHBar+Start.swift

@@ -0,0 +1,44 @@
+import AppKit
+import ArgumentParser
+import Foundation
+
+extension PHBar {
+	struct Start: ParsableCommand {
+		static let configuration = CommandConfiguration(
+			commandName: "start",
+			abstract: "Start the status bar.",
+			discussion: """
+				Launch the bar as a non-stopping background process.
+				This command is meant to be used for both testing and production.
+
+				When testing, you can provide the `--debug` flag to get visual
+				guidance that helps you configure the blocks and a verbose output from
+				the shell scripts to debug the behaviour.
+				"""
+		)
+
+		@Flag(name: .long, help: "Display visual guides and print verbose output.")
+		var debug: Bool = false
+
+		mutating func run() throws {
+			let config = try PHConfig.load()
+			let theme = try PHTheme.load(config.theme)
+			let layouts = try PHLayout.load(["default", "mini"])
+
+			// NOTE: Make sure NSApp.run() runs in the main thread
+			dispatchPrecondition(condition: .onQueue(.main))
+
+			try MainActor.assumeIsolated {
+				guard !NSScreen.screens.isEmpty else { throw CleanExit.message("No monitor found") }
+
+				let delegate = PHBarDelegate(config: config, theme: theme, layouts: layouts, debug: debug)
+				let app = NSApplication.shared
+				app.setActivationPolicy(.accessory)
+				app.delegate = delegate
+				app.run()
+
+				throw ExitCode.success
+			}
+		}
+	}
+}

Sources/phbar/Controllers/PHController.swift

@@ -1,75 +0,0 @@
-import SwiftUI
-
-@MainActor
-final class PHController: ObservableObject {
-	let config: PHConfig
-	let screen: NSScreen
-	let theme: PHTheme
-	var debug: Bool = false {
-		didSet {
-			for block in blocks {
-				block.debug = debug
-			}
-		}
-	}
-	@Published var blocks: [PHBlock]
-
-	var arrangedBlocks: [PHBlock] {
-		blocks.filter { $0.centered != true }
-	}
-
-	var centeredBlocks: [PHBlock] {
-		blocks.filter { $0.centered == true }
-	}
-
-	init(config: PHConfig, screen: NSScreen, theme: PHTheme, blocks: [PHBlock]) {
-		self.config = config
-		self.screen = screen
-		self.theme = theme
-		self.blocks = blocks
-
-		for block in blocks {
-			block.style = style(for: block)
-		}
-	}
-}
-
-// Style
-
-extension PHController {
-	func style(for block: PHBlock) -> PHThemeStyle {
-		guard let style = theme.styles.first(where: { $0.name == block.styleName }) else {
-			guard let defaultStyle = theme.styles.first(where: { $0.name == "default" }) else {
-				return PHThemeStyle.default
-			}
-			return defaultStyle
-		}
-		return style
-	}
-}
-
-// Refresh
-
-extension PHController {
-	/// Start auto-refresh for every block.
-	func startAutoRefresh() {
-		for block in blocks {
-			block.startAutoRefresh()
-		}
-	}
-
-	/// Stop auto-refresh for every block.
-	func stopAutoRefresh() {
-		for block in blocks {
-			block.stopAutoRefresh()
-		}
-	}
-
-	/// Force every block to recompute its label immediately (manual refresh).
-	/// Each block updates concurrently; the view refreshes as results arrive.
-	func refresh() {
-		for block in blocks {
-			Task { await block.update() }
-		}
-	}
-}

Sources/phbar/Extensions/String+Extensions.swift

@@ -0,0 +1,21 @@
+extension String {
+	/// Expand `$VAR` and `${VAR}` references against `variables`.
+	///
+	/// Unresolved references are left intact rather than blanked, so a typo
+	/// stays visible (e.g. a literal `"$TYPO"` in a color) instead of silently
+	/// vanishing.
+	func expanded(from environment: [String: String]) -> String {
+		var result = self
+
+		// `${VAR}` first, so the `$VAR` pass never sees its inner name.
+		result = result.replacing(/\$\{([A-Za-z_][A-Za-z0-9_]*)\}/) { match in
+			environment[String(match.1)] ?? String(match.0)
+		}
+		// `$VAR`
+		result = result.replacing(/\$([A-Za-z_][A-Za-z0-9_]*)/) { match in
+			environment[String(match.1)] ?? String(match.0)
+		}
+
+		return result
+	}
+}

Sources/phbar/Models/Config/PHConfig.swift

@@ -1,62 +0,0 @@
-import Foundation
-import TOML
-
-struct PHConfig: Decodable {
-	let text: PHConfigText
-}
-
-// Loading
-
-extension PHConfig {
-	/// Load configuration from the default path (~/.config/phbar/config.toml).
-	/// If the file doesn't exist or fails to parse, defaults are used (non-fatal).
-	static func load() throws -> PHConfig {
-		let url = FileManager.default.homeDirectoryForCurrentUser.appending(
-			path: ".config/phbar/config.toml"
-		)
-
-		if FileManager.default.fileExists(atPath: url.relativePath) {
-			return try load(from: url)
-		} else {
-			return try loadFromBundle()
-		}
-	}
-
-	/// Load the bundled configuration.
-	/// If the file doesn't exist or fails to parse, the execution is interrupted.
-	static private func loadFromBundle() throws -> PHConfig {
-		guard
-			let defaultConfig = Bundle.module.url(
-				forResource: "config",
-				withExtension: "toml"
-			)?.resolvingSymlinksInPath()
-		else {
-			throw phbar.Error("Failed to load config file")
-		}
-		return try load(from: defaultConfig)
-	}
-
-	/// Decode configuration from a file at URL.
-	/// If the file doesn't exist or fails to parse, the execution is interrupted.
-	static private func load(from url: URL) throws -> PHConfig {
-		guard let data = try? Data(contentsOf: url),
-			let contents = String(data: data, encoding: .utf8)
-		else {
-			throw phbar.Error("Failed to load config file")
-		}
-
-		return try load(from: contents)
-	}
-
-	/// Decode configuration from a TOML string.
-	/// If the content fails to parse, the execution is interrupted.
-	static private func load(from contents: String) throws -> PHConfig {
-		do {
-			let decoder = TOMLDecoder()
-			let configFile = try decoder.decode(PHConfig.self, from: contents)
-			return configFile
-		} catch {
-			throw phbar.Error("Failed to parse config file", underlyingError: error)
-		}
-	}
-}

Sources/phbar/Models/Config/Text/PHConfigTextStyle.swift

@@ -1,9 +0,0 @@
-enum PHConfigTextStyle: String, Decodable {
-	case normal, italic
-}
-
-extension PHConfigText {
-	var italic: Bool {
-		style == .italic
-	}
-}

Sources/phbar/Models/Config/config.toml

@@ -1,6 +0,0 @@
-[text]
-font   = "Comic Code"
-size   = 14
-weight = "regular"
-style  = "normal"
-offset = -0.5

Sources/phbar/Models/PHBarDelegate.swift

@@ -0,0 +1,69 @@
+import AppKit
+
+@MainActor
+final class PHBarDelegate: NSObject, NSApplicationDelegate {
+	/// One window per attached screen — the single source of truth. The matching
+	/// controllers are reached through `windows[i].barController`.
+	var windows: [BarWindow] = []
+
+	/// Convenience accessor over `windows`.
+	var controllers: [BarController] { windows.map(\.barController) }
+
+	/// Resolves a controller for any screen from the current config.
+	var factory: PHBarFactory
+
+	private var observers: [IPCObserver] = []
+	private var screenObserver: NSObjectProtocol?
+
+	init(config: PHConfig, theme: PHTheme, layouts: [String : PHLayout], debug: Bool) {
+		self.factory = PHBarFactory(
+			config: config,
+			theme: theme,
+			layouts: layouts,
+			debug: debug
+		)
+		super.init()
+	}
+
+	func applicationDidFinishLaunching(_ notification: Notification) {
+		syncScreens()
+
+		// React to monitor connect/disconnect and resolution changes. macOS
+		// delivers a single app-level notification for any of these; `syncScreens`
+		// diffs so unchanged bars are left untouched.
+		screenObserver = NotificationCenter.default.addObserver(
+			forName: NSApplication.didChangeScreenParametersNotification,
+			object: nil,
+			queue: .main
+		) { [weak self] _ in
+			Task { @MainActor in self?.syncScreens() }
+		}
+
+		// Listen for refresh notifications from `phbar refresh`.
+		let token = IPC.observe(.refresh) { [weak self] _ in
+			Task { @MainActor in self?.refresh() }
+		}
+		observers.append(token)
+	}
+
+	func refresh() {
+		for controller in controllers {
+			controller.refresh()
+		}
+	}
+
+	func applicationWillTerminate(_ notification: Notification) {
+		for controller in controllers {
+			controller.stopAutoRefresh()
+		}
+		observers.removeAll()
+		if let screenObserver {
+			NotificationCenter.default.removeObserver(screenObserver)
+			self.screenObserver = nil
+		}
+	}
+
+	func stderr(_ message: String) {
+		FileHandle.standardError.write(Data("phbar: \(message)\n".utf8))
+	}
+}

Sources/phbar/Models/PHBarDelegate/PHBarDelegate+Lifecycle.swift

@@ -0,0 +1,42 @@
+import AppKit
+
+extension PHBarDelegate {
+	/// Build, show, and start a bar for `screen`. Returns `false` (and prints to
+	/// stderr) if the screen's theme or blocks fail to load, so one bad screen
+	/// can't take down the others.
+	@discardableResult
+	func addBar(for screen: NSScreen) -> Bool {
+		let controller: BarController
+		do {
+			controller = try factory.make(for: screen)
+		} catch {
+			stderr("skipping screen \(screen.localizedName): \(error.localizedDescription)")
+			return false
+		}
+		let window = BarWindow(controller: controller)
+		window.orderFront(nil)
+		windows.append(window)
+		controller.startAutoRefresh()
+		return true
+	}
+
+	/// Stop refresh, hide, and drop the bar running on `screen` (if any).
+	func removeBar(for screen: NSScreen) {
+		guard let index = windows.firstIndex(where: { $0.barController.screen === screen }) else {
+			return
+		}
+		windows[index].barController.stopAutoRefresh()
+		windows[index].orderOut(nil)
+		windows.remove(at: index)
+	}
+
+	/// The window currently running on `screen`, if any.
+	func window(for screen: NSScreen) -> BarWindow? {
+		windows.first { $0.barController.screen === screen }
+	}
+
+	/// The window currently running on the monitor named `name`, if any.
+	func window(named name: String) -> BarWindow? {
+		windows.first { $0.barController.screen.localizedName == name }
+	}
+}

Sources/phbar/Models/PHBarDelegate/PHBarDelegate+ScreenSync.swift

@@ -0,0 +1,28 @@
+import AppKit
+
+extension PHBarDelegate {
+	/// Reconcile live bars against `screens`: tear down bars whose screen is
+	/// gone, recompute frames for screens whose geometry may have changed, and
+	/// add bars for newly attached screens.
+	///
+	/// A screen whose theme or blocks fail to load is skipped (with a stderr
+	/// message) rather than aborting the rest.
+	///
+	/// - Parameter screens: Defaults to `NSScreen.screens`; injected for tests.
+	func syncScreens(screens: [NSScreen] = NSScreen.screens) {
+		let plan = PHScreenSync.diff(
+			current: screens,
+			occupied: controllers.map(\.screen)
+		)
+
+		for screen in plan.removed {
+			removeBar(for: screen)
+		}
+		for screen in plan.kept {
+			window(for: screen)?.recomputeFrame()
+		}
+		for screen in plan.added {
+			addBar(for: screen)
+		}
+	}
+}

Sources/phbar/Models/PHBarFactory.swift

@@ -0,0 +1,31 @@
+import AppKit
+
+/// Builds a `BarController` for a screen by resolving its layout
+/// and window from the config.
+@MainActor
+struct PHBarFactory {
+	let config: PHConfig
+	let theme: PHTheme
+	let layouts: [String: PHLayout]
+	let debug: Bool
+
+	/// Resolve layout for `screen` and build its controller.
+	///
+	/// - Parameter screen: The screen to build a bar for. Its localized name
+	///   and index in `NSScreen.screens` select any per-monitor config override.
+	/// - Throws: `PHBlock.load` error for the resolved names.
+	func make(for screen: NSScreen) throws -> BarController {
+		let name = screen.localizedName
+		let index = NSScreen.screens.firstIndex(of: screen)
+		guard let layout = layouts[config.layout(screenName: name, screenIndex: index)] else {
+			throw PHBar.Error("Layout `\(name)` not found.")
+		}
+		return BarController(
+			config: config,
+			screen: screen,
+			theme: theme,
+			layout: layout,
+			debug: debug
+		)
+	}
+}

Sources/phbar/Models/PHBlock.swift

@@ -1,19 +1,22 @@
-import ArgumentParser
 import Foundation
-import SwiftUI
-import TOML
 
 @MainActor
 final class PHBlock: ObservableObject, Decodable, Identifiable {
 	let id = UUID()
-	let command: String
-	let name: String?
+
+	let name: String
+	let textName: String?
+	@Published var text: PHThemeText = .default
 	let styleName: String?
 	@Published var style: PHThemeStyle = .default
 	let refresh: Double?
 	let centered: Bool?
 	var debug: Bool = false
 
+	nonisolated var command: String {
+		PHPaths.configDirectory.appending(path: "scripts/\(name)").relativePath
+	}
+
 	var visible: Bool {
 		label != nil && !label!.isEmpty
 	}
@@ -26,20 +29,21 @@ final class PHBlock: ObservableObject, Decodable, Identifiable {
 	/// shared instance; inject a custom one for testing.
 	var registry: PHEventRegistry = .shared
 
-	@Published private(set) var label: String?
+	@Published var label: String?
 
 	/// The repeating interval task, if any.
-	private var intervalTask: Task<Void, Never>?
+	var intervalTask: Task<Void, Never>?
 
 	/// Active event subscriptions, torn down in `stopAutoRefresh`.
-	private var subscriptions: [PHEventSubscription] = []
+	var subscriptions: [PHEventSubscription] = []
 
 	/// Guards against stacking concurrent updates during rapid event bursts
 	/// (e.g. dragging the volume slider fires many events in quick succession).
-	private var updateScheduled = false
+	var resolveScheduled = false
 
 	private enum CodingKeys: String, CodingKey {
-		case command, name
+		case name
+		case textName = "text"
 		case styleName = "style"
 		case refresh, events, centered
 	}
@@ -49,193 +53,3 @@ final class PHBlock: ObservableObject, Decodable, Identifiable {
 		subscriptions.forEach { $0.cancel() }
 	}
 }
-
-// Kind
-
-extension PHBlock {
-	enum Kind: String {
-		case text, space
-	}
-
-	var kind: Kind {
-		if command.starts(with: "_space") { return .space }
-		return .text
-	}
-}
-
-// Refresh
-
-extension PHBlock {
-	/// Start keeping the label up to date.
-	///
-	/// Three independent triggers drive refreshes, and any combination works:
-	///
-	/// 1. **Interval** — when `refresh` is a positive number of seconds, the
-	///    label is recomputed on that interval.
-	/// 2. **Events** — each name in `events` subscribes to a system event source
-	///    (volume, network, appearance, power). Sources are activated lazily by
-	///    the registry: a listener runs only while at least one block subscribes
-	///    to it, so unused events cost nothing.
-	/// 3. **Manual** — `update()`, `PHController.refresh()`, or `phbar refresh`.
-	///
-	/// The label is always recomputed once immediately on start, then again on
-	/// any of the triggers above until `stopAutoRefresh()` is called.
-	func startAutoRefresh() {
-		stopAutoRefresh()
-
-		// Immediate refresh so the bar isn't blank until the first trigger fires.
-		scheduleUpdate()
-
-		// 1. Periodic refresh.
-		if let interval = refresh, interval > 0 {
-			let milliseconds = Int(interval * 1000)
-			intervalTask = Task { [weak self] in
-				while !Task.isCancelled {
-					try? await Task.sleep(for: .milliseconds(milliseconds))
-					if Task.isCancelled { break }
-					await self?.update()
-				}
-			}
-		}
-
-		// 2. Event-driven refresh. The registry lazily activates each underlying
-		//    system listener only while at least one block subscribes to it.
-		for event in (events ?? []) {
-			let subscription = registry.subscribe(event) { [weak self] in
-				self?.scheduleUpdate()
-			}
-			subscriptions.append(subscription)
-		}
-	}
-
-	/// Cancel the interval task and all event subscriptions.
-	func stopAutoRefresh() {
-		intervalTask?.cancel()
-		intervalTask = nil
-		subscriptions.forEach { $0.cancel() }
-		subscriptions.removeAll()
-	}
-
-	/// Recompute the label from `command`. Used by the interval loop, event
-	/// handlers, and manual updates.
-	func update() async {
-		label = await compute()
-	}
-
-	/// Request an update on the main actor, coalescing rapid bursts into a single
-	/// recomputation.
-	private func scheduleUpdate() {
-		guard !updateScheduled else { return }
-		updateScheduled = true
-		Task { [weak self] in
-			defer { self?.updateScheduled = false }
-			await self?.update()
-		}
-	}
-
-	func handleGesture(_ event: PHGestureEvent) {
-		Task { label = await compute(with: event) }
-	}
-
-	/// Runs the provided command and returns its stdout.
-	///
-	/// Runs off the main actor so it can be awaited safely from SwiftUI views
-	/// without blocking the UI.
-	///
-	/// - Returns: A non-optional String to use as the block label.
-	func compute(with gestureEvent: PHGestureEvent? = nil) async -> String? {
-		guard kind == .text else { return nil }
-
-		let command = command
-
-		let lines: [Substring]? = await Task.detached(priority: .userInitiated) {
-			let process = Process()
-			process.currentDirectoryURL = Self.configFile.deletingLastPathComponent()
-			process.executableURL = URL(fileURLWithPath: "/bin/bash")
-			process.arguments = ["-c", command]
-
-			// Inherit the parent's environment (includes $PATH, etc.)
-			process.environment = ProcessInfo.processInfo.environment
-			if let gestureEvent {
-				let type = gestureEvent.type.rawValue
-				process.environment?.updateValue(type, forKey: PHGestureEvent.typeKey)
-
-				if let data = gestureEvent.data {
-					process.environment?.updateValue(data, forKey: PHGestureEvent.infoKey)
-				}
-			}
-
-			// Capture stdout via a pipe (otherwise standardOutput is always nil).
-			let pipe = Pipe()
-			process.standardOutput = pipe
-
-			do {
-				try process.run()
-				process.waitUntilExit()
-				let data = pipe.fileHandleForReading.readDataToEndOfFile()
-				let string = String(data: data, encoding: .utf8)
-				guard let lines = string?.split(whereSeparator: \.isNewline) else { return nil }
-				return lines
-			} catch {
-				// Silently ignore failures
-				return nil
-			}
-		}.value
-
-		guard let lines else { return nil }
-		if self.debug { for line in lines { print(line) } }
-		return lines.last?.description
-	}
-}
-
-// Loading
-
-extension PHBlock {
-	private struct Wrapper: Decodable {
-		let blocks: [PHBlock]
-
-		enum CodingKeys: String, CodingKey {
-			case blocks = "block"
-		}
-	}
-
-	private nonisolated static var configFile: URL {
-		FileManager.default.homeDirectoryForCurrentUser.appending(path: ".config/phbar/blocks.toml")
-	}
-
-	/// Load blocks from the default path (~/.config/phbar/blocks.toml).
-	/// If the file doesn't exist or fails to parse, defaults are used (non-fatal).
-	static func load() throws -> [PHBlock] {
-		if FileManager.default.fileExists(atPath: Self.configFile.relativePath) {
-			return try load(from: Self.configFile)
-		} else {
-			throw phbar.Error("Failed to load blocks file")
-		}
-	}
-
-	/// Load theme from a file at URL.
-	/// If the file doesn't exist or fails to parse, the execution is interrupted.
-	static func load(from url: URL) throws -> [PHBlock] {
-		do {
-			let data = try Data(contentsOf: url)
-			guard let contents = String(data: data, encoding: .utf8), !contents.isEmpty else {
-				throw phbar.Error("the file is empty")
-			}
-			return try load(from: contents)
-		} catch {
-			throw phbar.Error("Failed to load blocks file", underlyingError: error)
-		}
-	}
-
-	/// Load theme from a TOML string.
-	/// If the content fails to parse, the execution is interrupted.
-	static func load(from contents: String) throws -> [PHBlock] {
-		do {
-			let decoder = TOMLDecoder()
-			let wrapper = try decoder.decode(PHBlock.Wrapper.self, from: contents)
-			return wrapper.blocks
-		} catch {
-			throw phbar.Error("Failed to parse blocks file", underlyingError: error)
-		}
-	}
-}

Sources/phbar/Models/PHBlock/PHBlock+Gesture.swift

@@ -0,0 +1,11 @@
+extension PHBlock {
+	func resolve(with event: PHGestureEvent) {
+		var environment = [String: String]()
+		environment.updateValue(event.type.rawValue, forKey: PHGestureEvent.typeKey)
+		if let data = event.data {
+			environment.updateValue(data, forKey: PHGestureEvent.infoKey)
+		}
+
+		resolve(merging: environment)
+	}
+}

Sources/phbar/Models/PHBlock/PHBlock+Refresh.swift

@@ -0,0 +1,53 @@
+import Foundation
+
+extension PHBlock {
+	/// Start keeping the label up to date.
+	///
+	/// Three independent triggers drive refreshes, and any combination works:
+	///
+	/// 1. **Interval** — when `refresh` is a positive number of seconds, the
+	///    label is recomputed on that interval.
+	/// 2. **Events** — each name in `events` subscribes to a system event source
+	///    (volume, network, appearance, power). Sources are activated lazily by
+	///    the registry: a listener runs only while at least one block subscribes
+	///    to it, so unused events cost nothing.
+	/// 3. **Manual** — `update()`, `PHController.refresh()`, or `phbar refresh`.
+	///
+	/// The label is always recomputed once immediately on start, then again on
+	/// any of the triggers above until `stopAutoRefresh()` is called.
+	func startAutoRefresh() {
+		stopAutoRefresh()
+
+		// Immediate refresh so the bar isn't blank until the first trigger fires.
+		resolve()
+
+		// 1. Periodic refresh.
+		if let interval = refresh, interval > 0 {
+			let milliseconds = Int(interval * 1000)
+			intervalTask = Task { [weak self] in
+				while !Task.isCancelled {
+					try? await Task.sleep(for: .milliseconds(milliseconds))
+					if Task.isCancelled { break }
+					await self?.resolve()
+				}
+			}
+		}
+
+		// 2. Event-driven refresh. The registry lazily activates each underlying
+		//    system listener only while at least one block subscribes to it.
+		for event in (events ?? []) {
+			let subscription = registry.subscribe(event) { [weak self] in
+				self?.resolve()
+			}
+			subscriptions.append(subscription)
+		}
+	}
+
+	/// Cancel the interval task and all event subscriptions.
+	func stopAutoRefresh() {
+		intervalTask?.cancel()
+		intervalTask = nil
+		subscriptions.forEach { $0.cancel() }
+		subscriptions.removeAll()
+	}
+}

Sources/phbar/Models/PHBlock/PHBlock+Resolve.swift

@@ -0,0 +1,118 @@
+import Foundation
+
+extension PHBlock {
+	/// Resolve the label by executing `command`.
+	/// Used by the interval loop, event handlers, and manual updates.
+	func resolve(merging environment: [String: String]? = nil) {
+		guard canResolve() else { return }
+
+		guard !resolveScheduled else { return }
+		resolveScheduled = true
+
+		Task(name: command, priority: .userInitiated) { [weak self] in
+			defer { self?.resolveScheduled = false }
+
+			do {
+				self?.label = try await self?.resolve(merging: environment)
+			} catch {
+				self?.printStandardError(error.localizedDescription)
+			}
+		}
+	}
+
+	/// Resolve the label by executing `command`.
+	/// Used by the interval loop, event handlers, and manual updates.
+	func resolve(merging environment: [String: String]? = nil) async {
+		guard canResolve() else { return }
+
+		do {
+			label = try await resolve(merging: environment)
+		} catch {
+			printStandardError(error.localizedDescription)
+		}
+	}
+
+	private func resolve(merging environment: [String: String]?) async throws -> String? {
+		let customEnvironment = environment
+
+		var environment = ProcessInfo.processInfo.environment
+		if let customEnvironment {
+			environment.merge(customEnvironment) { (_, new) in new }
+		}
+
+		return try await resolve(with: environment)
+	}
+
+	private func resolve(with environment: [String: String]) async throws -> String? {
+		do {
+			let (stdout, stderr) = try await resolve(command, with: environment)
+			printStandardError(stderr)
+			printStandardOutput(stdout)
+			guard let lines = stdout?.split(whereSeparator: \.isNewline),
+				let last = lines.last
+			else {
+				return nil
+			}
+			return String(last)
+		} catch {
+			throw error
+		}
+	}
+
+	private func canResolve() -> Bool {
+		guard kind == .text else { return false }
+
+		return true
+	}
+
+	private func resolve(_ command: String, with environment: [String: String]) async throws -> (
+		stdout: String?,
+		stderr: String?
+	) {
+		return try await withCheckedThrowingContinuation { continuation in
+			let process = Process()
+			let stdoutPipe = Pipe()
+			let stderrPipe = Pipe()
+
+			process.executableURL = URL(fileURLWithPath: "/bin/zsh")
+			process.currentDirectoryURL = PHPaths.configDirectory
+			process.environment = environment
+			process.arguments = ["-c", command]
+			process.standardOutput = stdoutPipe
+			process.standardError = stderrPipe
+
+			do {
+				try process.run()
+				process.waitUntilExit()
+
+				let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
+				let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
+
+				let stdout = String(data: stdoutData, encoding: .utf8)
+				let stderr = String(data: stderrData, encoding: .utf8)
+
+				continuation.resume(returning: (stdout, stderr))
+			} catch {
+				continuation.resume(throwing: error)
+			}
+		}
+	}
+
+	/// Print a message to standard output.
+	/// Silenced unless in debug mode.
+	///
+	/// - Parameter message: the content of the message
+	private func printStandardOutput(_ message: String?) {
+		guard debug, let data = message?.data(using: .utf8) else { return }
+		FileHandle.standardOutput.write(data)
+	}
+
+	/// Print a message to standard error.
+	/// Silenced unless in debug mode.
+	///
+	/// - Parameter message: the content of the message
+	private func printStandardError(_ message: String?) {
+		guard debug, let data = message?.data(using: .utf8) else { return }
+		FileHandle.standardError.write(data)
+	}
+}

Sources/phbar/Models/PHBlock/PHBlockKind.swift

@@ -0,0 +1,11 @@
+enum PHBlockKind: String {
+	case text, space, divider
+}
+
+extension PHBlock {
+	var kind: PHBlockKind {
+		if name.starts(with: "_space") { return .space }
+		if name.starts(with: "_divider") { return .divider }
+		return .text
+	}
+}

Sources/phbar/Models/PHConfig.swift

@@ -0,0 +1,25 @@
+struct PHConfig: Decodable {
+	let theme: String
+	let window: String
+	let layout: String
+	let monitors: [String: PHConfigMonitorOverride]?
+
+	private enum CodingKeys: String, CodingKey {
+		case theme, window, layout
+		case monitors = "monitor"
+	}
+
+	var layouts: Set<String> {
+		var layouts = Set<String>()
+		layouts.insert(layout)
+
+		guard let monitors else { return layouts }
+		for monitor in monitors.values {
+			if let layout = monitor.layout {
+				layouts.insert(layout)
+			}
+		}
+
+		return layouts
+	}
+}

Sources/phbar/Models/PHConfig/PHConfig+Loading.swift

@@ -0,0 +1,42 @@
+import Foundation
+import TOML
+
+extension PHConfig {
+	/// Load the configuration from the resolved config directory (see `PHPaths`).
+	/// If the file doesn't exist or fails to parse, the execution is interrupted.
+	static func load() throws -> PHConfig {
+		let url = PHPaths.configFile
+
+		if FileManager.default.fileExists(atPath: url.relativePath) {
+			return try load(from: url)
+		} else {
+			let config = url.lastPathComponent
+			throw PHBar.Error(
+				"""
+				Configuration file not found.
+				       Make sure to have a file named `\(config)` inside the
+				       directory: `\(PHPaths.configDirectory.relativePath)`
+
+				Tip: If you've never used phbar before, run the `phbar install` command
+				     to automatically generate the required configuration files.
+				"""
+			)
+		}
+	}
+
+	/// Load the configuration from the file at URL.
+	/// If the file doesn't exist or fails to parse, the execution is interrupted.
+	static private func load(from url: URL) throws -> PHConfig {
+		do {
+			let data = try Data(contentsOf: url)
+			guard let contents = String(data: data, encoding: .utf8) else {
+				throw PHBar.Error("content is not UTF8 encoded.")
+			}
+			let decoder = TOMLDecoder()
+			let configFile = contents.expanded(from: ProcessInfo.processInfo.environment)
+			return try decoder.decode(PHConfig.self, from: configFile)
+		} catch {
+			throw PHBar.Error("Configuration file not readable", underlyingError: error)
+		}
+	}
+}

Sources/phbar/Models/PHConfig/PHConfigMonitorOverride.swift

@@ -0,0 +1,39 @@
+import Foundation
+
+/// A per-monitor entry from the config's `[monitor]` table.
+///
+/// Either field is optional; an unset field inherits the matching global
+/// (`window` or `layout`) so a monitor can override just one of them.
+struct PHConfigMonitorOverride: Decodable {
+	let window: String?
+	let layout: String?
+
+	init(window: String? = nil, layout: String? = nil) {
+		self.window = window
+		self.layout = layout
+	}
+}
+
+extension PHConfig {
+	/// The per-monitor override matching the given screen identity, if any.
+	///
+	/// Precedence: monitor name → monitor index.
+	func monitorOverride(screenName: String, screenIndex: Int?) -> PHConfigMonitorOverride? {
+		guard let monitors else { return nil }
+		if let byName = monitors[screenName] { return byName }
+		if let index = screenIndex, let byIndex = monitors[String(index)] { return byIndex }
+		return nil
+	}
+
+	/// Window name for a screen: the override's `window` if set,
+	/// otherwise the global `window`.
+	func window(screenName: String, screenIndex: Int?) -> String {
+		monitorOverride(screenName: screenName, screenIndex: screenIndex)?.window ?? window
+	}
+
+	/// Layout name for a screen: the override's `layout` if set,
+	/// otherwise the global `layout`.
+	func layout(screenName: String, screenIndex: Int?) -> String {
+		monitorOverride(screenName: screenName, screenIndex: screenIndex)?.layout ?? layout
+	}
+}

Sources/phbar/Models/PHEvent.swift

@@ -5,7 +5,7 @@ import Foundation
 /// Modeled as a `String`-backed value so it decodes straight from the TOML
 /// config (e.g. `events = ["volume", "network"]`). phbar ships **no compiled
 /// event sources**: every name resolves at runtime to an external recognizer
-/// loaded from `~/.config/phbar/events/<name>/` — a `dlopen`'d library whose
+/// loaded from `<config>/events/<name>/` — a `dlopen`'d library whose
 /// root object conforms to `PHEventRecognizer`. To add an event, install a
 /// recognizer folder; no host code change is required.
 struct PHEvent: Hashable, Sendable {

Sources/phbar/Models/PHEvent/PHEventLoader.swift

@@ -3,8 +3,8 @@ import Foundation
 import phbarEvents
 
 /// Loads external event recognizers (shared libraries) from the user's config
-/// directory: `~/.config/phbar/events/<name>/event.toml` + the referenced
-/// library.
+/// directory (see `PHPaths`): `<config>/events/<name>/event.toml` + the
+/// referenced library.
 ///
 /// Each event lives in its own folder. The manifest names the `.dylib` and,
 /// optionally, the factory symbol (default `phbar_event_create`). Libraries are
@@ -31,7 +31,7 @@ final class PHEventLoader {
 	}
 
 	static var defaultDirectory: URL {
-		FileManager.default.homeDirectoryForCurrentUser.appending(path: ".config/phbar/events")
+		PHPaths.configDirectory.appending(path: "events")
 	}
 
 	/// Returns the recognizer for `name`, loading and caching it on first access.

Sources/phbar/Models/PHEvent/PHEventManifest.swift

@@ -2,7 +2,7 @@ import Foundation
 import TOML
 
 /// The manifest describing an external event recognizer, read from
-/// `~/.config/phbar/events/<name>/event.toml`.
+/// `<config>/events/<name>/event.toml`.
 ///
 /// ```toml
 /// library    = "event.dylib"          # required: shared library file name

Sources/phbar/Models/PHEvent/PHEventRegistry.swift

@@ -85,7 +85,7 @@ final class PHEventRegistry {
 
 	/// Resolves an event to its source. phbar ships no compiled sources: every
 	/// name is handed to `PHEventLoader`, which `dlopen`s a user-supplied
-	/// recognizer from `~/.config/phbar/events/<name>/`. Returns `nil` if no
+	/// recognizer from `<config>/events/<name>/`. Returns `nil` if no
 	/// recognizer is installed.
 	static func defaultFactory(_ event: PHEvent) -> (any PHEventSource)? {
 		guard let recognizer = PHEventLoader.shared.recognizer(for: event.rawValue) else { return nil }

Sources/phbar/Models/PHLayout.swift

@@ -0,0 +1,7 @@
+struct PHLayout: Decodable {
+	let blocks: [PHBlock]
+
+	private enum CodingKeys: String, CodingKey {
+		case blocks = "block"
+	}
+}

Sources/phbar/Models/PHLayout/PHLayout+Loading.swift

@@ -0,0 +1,55 @@
+import Foundation
+import TOML
+
+extension PHLayout {
+	/// Load the specified layouts from the resolved config directory (see `PHPaths`).
+	/// If any of theme doesn't exist or fails to parse, the execution is interrupted.
+	static func load(_ layouts: Set<String>) throws -> [String: PHLayout] {
+		var dictionary = [String: PHLayout]()
+
+		for layout in layouts {
+			dictionary.updateValue(try load(layout), forKey: layout)
+		}
+
+		return dictionary
+	}
+
+	/// Load a layout from the resolved config directory (see `PHPaths`).
+	/// If the file doesn't exist or fails to parse, the execution is interrupted.
+	static func load(_ layout: String) throws -> PHLayout {
+		let url = PHPaths.layoutsDirectory.appending(path: "\(layout).toml")
+
+		if FileManager.default.fileExists(atPath: url.relativePath) {
+			return try load(from: url)
+		} else {
+			let layout = url.lastPathComponent
+			throw PHBar.Error(
+				"""
+				Layout file not found.
+				       Make sure to have a file named `\(layout)` inside the
+				       directory: `\(PHPaths.layoutsDirectory.relativePath)`
+
+				Tip: If you've never used phbar before, run `phbar generate config`
+				     to automatically generate the required configuration files.
+				"""
+			)
+		}
+	}
+
+	/// Load a layout from the file at URL.
+	/// If the file doesn't exist or fails to parse, the execution is interrupted.
+	static private func load(from url: URL) throws -> PHLayout {
+		do {
+			let data = try Data(contentsOf: url)
+			guard let contents = String(data: data, encoding: .utf8) else {
+				throw PHBar.Error("content is not UTF8 encoded.")
+			}
+			let decoder = TOMLDecoder()
+			let layoutFile = contents.expanded(from: ProcessInfo.processInfo.environment)
+			return try decoder.decode(PHLayout.self, from: layoutFile)
+		} catch {
+			let layout = url.lastPathComponent
+			throw PHBar.Error("Layout file `\(layout)` not readable", underlyingError: error)
+		}
+	}
+}

Sources/phbar/Models/PHPaths.swift

@@ -0,0 +1,70 @@
+import Foundation
+
+/// Resolves phbar's configuration directory.
+///
+/// Searches these locations in priority order and returns the first that
+/// exists on disk:
+///
+/// 1. `$XDG_CONFIG_HOME/phbar` — only when `XDG_CONFIG_HOME` is set to an
+///    absolute path (a relative/empty value is ignored, per the XDG spec).
+/// 2. `~/.config/phbar`
+/// 3. `~/.phbar`
+///
+/// If none exist yet (fresh install), the highest-priority candidate is
+/// returned so loaders and block commands have a stable root to resolve into.
+enum PHPaths {
+	/// The resolved configuration directory (computed once, cached).
+	static let configDirectory: URL = resolveConfigDirectory()
+
+	/// The resolved config file (computed once, cached).
+	static let configFile: URL = {
+		configDirectory.appending(path: "config.toml")
+	}()
+
+	/// The resolved themes directory (computed once, cached).
+	static let themesDirectory: URL = {
+		configDirectory.appending(path: "themes")
+	}()
+
+	/// The resolved layouts directory (computed once, cached).
+	static let layoutsDirectory: URL = {
+		configDirectory.appending(path: "layouts")
+	}()
+
+	/// Ordered candidate directories, priority high → low.
+	///
+	/// - Parameter environment: Override the environment lookup (used by tests);
+	///   defaults to the current process environment.
+	static func configDirectoryCandidates(
+		environment: [String: String] = ProcessInfo.processInfo.environment
+	) -> [URL] {
+		let home = FileManager.default.homeDirectoryForCurrentUser
+		var candidates: [URL] = []
+
+		if let xdg = environment["XDG_CONFIG_HOME"] {
+			let trimmed = xdg.trimmingCharacters(in: .whitespaces)
+			if trimmed.hasPrefix("/") {
+				candidates.append(URL(fileURLWithPath: trimmed).appending(path: "phbar"))
+			}
+		}
+		candidates.append(home.appending(path: ".config/phbar"))
+		candidates.append(home.appending(path: ".phbar"))
+		return candidates
+	}
+
+	/// First existing candidate, or the highest-priority one if none exist.
+	///
+	/// - Parameter environment: Override the environment lookup (used by tests);
+	///   defaults to the current process environment.
+	static func resolveConfigDirectory(
+		environment: [String: String] = ProcessInfo.processInfo.environment
+	) -> URL {
+		let candidates = configDirectoryCandidates(environment: environment)
+		for candidate in candidates {
+			if FileManager.default.fileExists(atPath: candidate.path) {
+				return candidate
+			}
+		}
+		return candidates[0]
+	}
+}

Sources/phbar/Models/PHScreenSync.swift

@@ -0,0 +1,31 @@
+import AppKit
+
+/// Which screens to keep, remove, or add when reconciling live bars against the
+/// current `NSScreen.screens`.
+///
+/// Pure and identity-based (it never reads `NSScreen` properties), so it can be
+/// unit-tested with any `[NSScreen]` without driving real window lifecycle.
+enum PHScreenSync {
+	struct Diff: Equatable {
+		/// Screens that already have a bar and are still attached. Their window
+		/// frame is recomputed since geometry may have changed.
+		let kept: [NSScreen]
+		/// Screens whose bar must be torn down (monitor disconnected).
+		let removed: [NSScreen]
+		/// Screens with no bar yet that need one (monitor connected).
+		let added: [NSScreen]
+	}
+
+	/// Compare the screens now attached (`current`) against the screens currently
+	/// occupied by bars (`occupied`). A disconnected monitor reappears as a new
+	/// `NSScreen` instance, so it is reported as remove + add, never a keep.
+	static func diff(current: [NSScreen], occupied: [NSScreen]) -> Diff {
+		let currentIDs = Set(current.map(ObjectIdentifier.init))
+		let occupiedIDs = Set(occupied.map(ObjectIdentifier.init))
+		return Diff(
+			kept: occupied.filter { currentIDs.contains(ObjectIdentifier($0)) },
+			removed: occupied.filter { !currentIDs.contains(ObjectIdentifier($0)) },
+			added: current.filter { !occupiedIDs.contains(ObjectIdentifier($0)) }
+		)
+	}
+}

Sources/phbar/Models/PHTheme.swift

@@ -0,0 +1,11 @@
+struct PHTheme: Decodable {
+	let windows: [PHThemeWindow]?
+	let texts: [PHThemeText]?
+	let styles: [PHThemeStyle]?
+
+	private enum CodingKeys: String, CodingKey {
+		case windows = "window"
+		case texts = "text"
+		case styles = "style"
+	}
+}

Sources/phbar/Models/PHTheme/PHTheme+Loading.swift

@@ -0,0 +1,43 @@
+import Foundation
+import TOML
+
+extension PHTheme {
+	/// Load a theme from the resolved config directory (see `PHPaths`).
+	/// If the file doesn't exist or fails to parse, the execution is interrupted.
+	static func load(_ theme: String) throws -> PHTheme {
+		let url = PHPaths.themesDirectory.appending(path: "\(theme).toml")
+
+		if FileManager.default.fileExists(atPath: url.relativePath) {
+			return try load(from: url)
+		} else {
+			let theme = url.lastPathComponent
+			throw PHBar.Error(
+				"""
+				Theme file not found.
+				       Make sure to have a file named `\(theme)` inside the
+				       directory: `\(PHPaths.themesDirectory.relativePath)`
+
+				Tip: If you've never used phbar before, run the `phbar install` command
+				     to automatically generate the required configuration files.
+				"""
+			)
+		}
+	}
+
+	/// Load a theme from the file at URL.
+	/// If the file doesn't exist or fails to parse, the execution is interrupted.
+	static private func load(from url: URL) throws -> PHTheme {
+		do {
+			let data = try Data(contentsOf: url)
+			guard let contents = String(data: data, encoding: .utf8) else {
+				throw PHBar.Error("content is not UTF8 encoded.")
+			}
+			let decoder = TOMLDecoder()
+			let themeFile = contents.expanded(from: ProcessInfo.processInfo.environment)
+			return try decoder.decode(PHTheme.self, from: themeFile)
+		} catch {
+			let theme = url.lastPathComponent
+			throw PHBar.Error("Theme file `\(theme)` not readable", underlyingError: error)
+		}
+	}
+}

Sources/phbar/Models/PHTheme/PHThemeStyle.swift

@@ -1,15 +1,17 @@
 struct PHThemeStyle: Decodable {
 	let name: String
-	let foreground: PHThemeColor
-	let background: PHThemeColor
-	let padding: PHThemePadding
+	let foreground: PHThemeStyleColor?
+	let background: PHThemeStyleColor?
+	let padding: PHThemeStylePadding?
+	let corner: PHThemeStyleCorner?
 
 	static let `default`: Self = {
 		PHThemeStyle(
 			name: "_default",
 			foreground: .init(color: "#000000", alpha: nil),
 			background: .init(color: "#ffffff", alpha: nil),
-			padding: .init(leading: 10, trailing: 10)
+			padding: .init(top: 0, bottom: 0, leading: 12, trailing: 12),
+			corner: nil
 		)
 	}()
 }

Sources/phbar/Models/PHTheme/PHThemeStyle/PHThemeStyleColor.swift

@@ -1,9 +1,9 @@
 import SwiftUI
 
-struct PHThemeColor: Decodable, ShapeStyle {
+struct PHThemeStyleColor: Decodable, ShapeStyle {
 	typealias Resolved = SwiftUI.Color
 
-	let color: String
+	var color: String
 	let alpha: Double?
 
 	var uiColor: SwiftUI.Color {

Sources/phbar/Models/PHTheme/PHThemeStyle/PHThemeStyleCorner.swift

@@ -0,0 +1,26 @@
+import SwiftUI
+
+struct PHThemeStyleCorner: Decodable {
+	let radius: Double
+	private let _style: PHThemeStyleCornerStyle?
+
+	var style: SwiftUI.RoundedCornerStyle {
+		switch _style {
+		case .circular:
+			return .circular
+		case .continuous:
+			return .continuous
+		default:
+			return .circular
+		}
+	}
+
+	private enum CodingKeys: String, CodingKey {
+		case radius
+		case _style = "style"
+	}
+}
+
+enum PHThemeStyleCornerStyle: String, Decodable {
+	case circular, continuous
+}

Sources/phbar/Models/PHTheme/PHThemeStyle/PHThemeStylePadding.swift

@@ -0,0 +1,13 @@
+struct PHThemeStylePadding: Decodable {
+	let top: Double?
+	let bottom: Double?
+	let leading: Double?
+	let trailing: Double?
+
+	private enum CodingKeys: String, CodingKey {
+		case top
+		case bottom
+		case leading = "left"
+		case trailing = "right"
+	}
+}

Sources/phbar/Models/PHTheme/PHThemeText.swift

@@ -1,22 +1,35 @@
 import AppKit
 import SwiftUI
 
-struct PHConfigText: Decodable {
-	let fontFamily: String
+struct PHThemeText: Decodable {
+	let name: String
+	var fontFamily: String
 	let size: Double
-	let weight: PHConfigTextWeight
-	let style: PHConfigTextStyle
+	let weight: PHThemeTextWeight
+	let style: PHThemeTextStyle
 	let offset: Double?
 
-	enum CodingKeys: String, CodingKey {
+	private enum CodingKeys: String, CodingKey {
+		case name
 		case fontFamily = "font"
 		case size, weight, style, offset
 	}
+
+	static let `default`: Self = {
+		PHThemeText(
+			name: "_default",
+			fontFamily: "monospace",
+			size: 14.0,
+			weight: .regular,
+			style: .normal,
+			offset: nil
+		)
+	}()
 }
 
 // Design
 
-extension PHConfigText {
+extension PHThemeText {
 	var design: SwiftUI.Font.Design? {
 		switch fontFamily {
 		case "sans":
@@ -46,7 +59,7 @@ extension PHConfigText {
 
 // Font
 
-extension PHConfigText {
+extension PHThemeText {
 	/// Construct an `NSFont` from the typeface settings.
 	///
 	/// Falls back to the system font if parsing fails.

Sources/phbar/Models/PHTheme/PHThemeText/PHThemeTextStyle.swift

@@ -0,0 +1,9 @@
+enum PHThemeTextStyle: String, Decodable {
+	case normal, italic
+}
+
+extension PHThemeText {
+	var italic: Bool {
+		style == .italic
+	}
+}

Sources/phbar/Models/PHTheme/PHThemeText/PHThemeTextWeight.swift

@@ -1,7 +1,7 @@
 import AppKit
 import SwiftUI
 
-enum PHConfigTextWeight: String, Decodable {
+enum PHThemeTextWeight: String, Decodable {
 	case thin
 	case ultraLight = "ultralight"
 	case light

Sources/phbar/Models/PHTheme/PHThemeWindow.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+struct PHThemeWindow: Decodable {
+	let name: String
+	var hasShadow: Bool? = false
+	var blur: Double? = 0
+
+	/// Window height in points.
+	var height: Double? = 30
+	/// Window width: a point value or a percentage of the screen width.
+	var width: PHThemeWindowDimension? = .percentage(1.0)
+	/// Semantic placement within the screen.
+	var anchor: PHThemeWindowAnchor? = .top
+	/// Insets from the anchored edges.
+	var margin: PHThemeWindowMargin? = .init()
+	/// Absolute origin. Overrides `anchor` and `margin` when set.
+	var origin: PHThemeWindowPoint?
+
+	private enum CodingKeys: String, CodingKey {
+		case name
+		case hasShadow = "shadow"
+		case blur
+		case height, width, anchor, margin, origin
+	}
+
+	static let `default`: Self = {
+		PHThemeWindow(
+			name: "_default",
+			hasShadow: false,
+			blur: 0.0
+		)
+	}()
+}

Sources/phbar/Models/PHTheme/PHThemeWindow/PHThemeWindowAnchor.swift

@@ -0,0 +1,60 @@
+import CoreGraphics
+import Foundation
+
+/// Where a window is placed within its screen.
+///
+/// Single-edge anchors (`top`, `bottom`, `leading`, `trailing`) pin to that
+/// edge and center along the opposite axis. Corner anchors pin to two edges.
+/// `center` centers the window on both axes.
+enum PHThemeWindowAnchor: String, Decodable {
+	case top, bottom, leading, trailing
+	case topLeading = "top-left"
+	case topTrailing = "top-right"
+	case bottomLeading = "bottom-left"
+	case bottomTrailing = "bottom-right"
+	case center
+}
+
+extension PHThemeWindowAnchor {
+	/// Compute the top-left origin (in screen coordinates) of a window of `size`
+	/// placed against this anchor within `rect`.
+	///
+	/// `rect` is the content rectangle the window is placed within — typically the
+	/// screen inset by the window's margin (see `PHThemeWindowMargin.inset(of:)`).
+	/// Single-edge anchors pin to that edge and center along the opposite axis;
+	/// corner anchors pin to two edges; `.center` centers on both axes.
+	func origin(in rect: CGRect, size: CGSize) -> CGPoint {
+		// Default: centered on both axes within the rect.
+		var point = CGPoint(
+			x: rect.midX - size.width / 2,
+			y: rect.midY - size.height / 2
+		)
+
+		switch self {
+		case .top:
+			point.y = rect.maxY - size.height
+		case .bottom:
+			point.y = rect.minY
+		case .leading:
+			point.x = rect.minX
+		case .trailing:
+			point.x = rect.maxX - size.width
+		case .topLeading:
+			point.x = rect.minX
+			point.y = rect.maxY - size.height
+		case .topTrailing:
+			point.x = rect.maxX - size.width
+			point.y = rect.maxY - size.height
+		case .bottomLeading:
+			point.x = rect.minX
+			point.y = rect.minY
+		case .bottomTrailing:
+			point.x = rect.maxX - size.width
+			point.y = rect.minY
+		case .center:
+			break
+		}
+
+		return point
+	}
+}

Sources/phbar/Models/PHTheme/PHThemeWindow/PHThemeWindowDimension.swift

@@ -0,0 +1,48 @@
+import CoreGraphics
+import Foundation
+
+/// A length expressed either in points or as a percentage of the available
+/// space (e.g. the screen width).
+///
+/// Decoded from either a number (`width = 400`) or a percentage string
+/// (`width = "100%"`).
+enum PHThemeWindowDimension: Decodable, Equatable {
+	case points(Double)
+	case percentage(Double)
+
+	init(from decoder: Decoder) throws {
+		let container = try decoder.singleValueContainer()
+
+		// TOML encodes integers and floats distinctly, so accept both.
+		if let double = try? container.decode(Double.self) {
+			self = .points(double)
+			return
+		}
+		if let int = try? container.decode(Int.self) {
+			self = .points(Double(int))
+			return
+		}
+		if let string = try? container.decode(String.self) {
+			let trimmed = string.trimmingCharacters(in: .whitespaces)
+			if trimmed.hasSuffix("%"), let value = Double(trimmed.dropLast()) {
+				self = .percentage(value / 100.0)
+				return
+			}
+		}
+
+		throw DecodingError.dataCorruptedError(
+			in: container,
+			debugDescription: #"Expected a number or a percentage string like "100%""#
+		)
+	}
+
+	/// Resolve the dimension against a total length.
+	func resolve(against length: CGFloat) -> CGFloat {
+		switch self {
+		case .points(let value):
+			return CGFloat(value)
+		case .percentage(let ratio):
+			return length * CGFloat(ratio)
+		}
+	}
+}

Sources/phbar/Models/PHTheme/PHThemeWindow/PHThemeWindowMargin.swift

@@ -0,0 +1,50 @@
+import CoreGraphics
+import Foundation
+
+/// Insets (in points) from the screen edges, defining the content rectangle a
+/// window is sized and placed within.
+///
+/// Margins compose with `width`/`height`: a `width = "100%"` window spans the
+/// space *between* the leading/trailing margins rather than the full screen.
+/// Unspecified edges are left untouched (treated as 0).
+struct PHThemeWindowMargin: Decodable, Equatable {
+	let top: Double?
+	let bottom: Double?
+	let leading: Double?
+	let trailing: Double?
+
+	private enum CodingKeys: String, CodingKey {
+		case top
+		case bottom
+		case leading = "left"
+		case trailing = "right"
+	}
+
+	init(
+		top: Double? = nil,
+		bottom: Double? = nil,
+		leading: Double? = nil,
+		trailing: Double? = nil
+	) {
+		self.top = top
+		self.bottom = bottom
+		self.leading = leading
+		self.trailing = trailing
+	}
+
+	/// Returns `rect` inset by the specified edges; unspecified edges are left
+	/// untouched (treated as 0). Uses AppKit's coordinate system (origin at the
+	/// bottom-left, y increasing upward): `top` reduces the max-Y edge.
+	func inset(of rect: CGRect) -> CGRect {
+		let l = leading ?? 0
+		let r = trailing ?? 0
+		let t = top ?? 0
+		let b = bottom ?? 0
+		return CGRect(
+			x: rect.minX + l,
+			y: rect.minY + b,
+			width: rect.width - l - r,
+			height: rect.height - t - b
+		)
+	}
+}

Sources/phbar/Models/PHTheme/PHThemeWindow/PHThemeWindowPoint.swift

@@ -0,0 +1,10 @@
+import Foundation
+
+/// An absolute screen-space origin.
+///
+/// When set on a window, it overrides anchor/margin placement entirely — the
+/// window appears at exactly these coordinates.
+struct PHThemeWindowPoint: Decodable, Equatable {
+	let x: Double
+	let y: Double
+}

Sources/phbar/Models/Theme/PHTheme.swift

@@ -1,71 +0,0 @@
-import Foundation
-import TOML
-
-struct PHTheme: Decodable {
-	let window: PHThemeWindow
-	let styles: [PHThemeStyle]
-
-	enum CodingKeys: String, CodingKey {
-		case window
-		case styles = "style"
-	}
-}
-
-// Loading
-
-extension PHTheme {
-	/// Load theme from the config directory (~/.config/phbar/themes/).
-	/// If the file doesn't exist or fails to parse, defaults are used (non-fatal).
-	static func load(_ theme: String?) throws -> PHTheme {
-		guard let theme else { return try loadFromBundle() }
-
-		let url = FileManager.default.homeDirectoryForCurrentUser.appending(
-			path: ".config/phbar/themes/\(theme).toml"
-		)
-
-		if FileManager.default.fileExists(atPath: url.relativePath) {
-			return try load(from: url)
-		} else {
-			return try loadFromBundle()
-		}
-	}
-
-	/// Load the bundled theme.
-	/// If the file doesn't exist or fails to parse, the execution is interrupted.
-	static private func loadFromBundle() throws -> PHTheme {
-		guard
-			let defaultConfig = Bundle.module.url(
-				forResource: "theme",
-				withExtension: "toml"
-			)?.resolvingSymlinksInPath()
-		else {
-			throw phbar.Error("Failed to load theme file")
-		}
-		return try load(from: defaultConfig)
-	}
-
-	/// Load theme from a file at URL.
-	/// If the file doesn't exist or fails to parse, the execution is interrupted.
-	static private func load(from url: URL) throws -> PHTheme {
-		do {
-			let data = try Data(contentsOf: url)
-			guard let contents = String(data: data, encoding: .utf8), !contents.isEmpty else {
-				throw phbar.Error("the file is empty")
-			}
-			return try load(from: contents)
-		} catch {
-			throw phbar.Error("Failed to load theme file", underlyingError: error)
-		}
-	}
-
-	/// Load theme from a TOML string.
-	/// If the content fails to parse, the execution is interrupted.
-	static private func load(from contents: String) throws -> PHTheme {
-		do {
-			let decoder = TOMLDecoder()
-			return try decoder.decode(PHTheme.self, from: contents)
-		} catch {
-			throw phbar.Error("Failed to parse theme file", underlyingError: error)
-		}
-	}
-}

Sources/phbar/Models/Theme/PHThemePadding.swift

@@ -1,10 +0,0 @@
-struct PHThemePadding: Decodable {
-	let leading: Double
-	let trailing: Double
-
-	var total: Double { leading + trailing }
-
-	static var zero: PHThemePadding {
-		Self.init(leading: 0, trailing: 0)
-	}
-}

Sources/phbar/Models/Theme/PHThemeWindow.swift

@@ -1,9 +0,0 @@
-struct PHThemeWindow: Decodable {
-	let hasShadow: Bool
-	let blur: Double
-
-	enum CodingKeys: String, CodingKey {
-		case hasShadow = "shadow"
-		case blur
-	}
-}

Sources/phbar/Models/Theme/theme.toml

@@ -1,25 +0,0 @@
-# phbar theme file ~ Voltage
-#
-# Place at ~/.config/phbar/themes/voltage.toml
-
-[window]
-shadow = false
-blur   = 0.0
-
-[[style]]
-name = "default"
-foreground = { color = "#aed3f3" }
-background = { color = "#010408", alpha = 0.825 }
-padding    = { leading = 0.0, trailing = 0.0 }
-
-[[style]]
-name = "floating"
-foreground = { color = "#aed3f3" }
-background = { color = "#000000", alpha = 0 }
-padding    = { leading = 0.0, trailing = 0.0 }
-
-[[style]]
-name = "tinted"
-foreground = { color = "#aed3f3" }
-background = { color = "#0f304a" }
-padding    = { leading = 12.0, trailing = 12.0 }

Sources/phbar/PHBar.swift

@@ -8,21 +8,42 @@ import ArgumentParser
 import Foundation
 
 @main
-struct phbar: ParsableCommand {
+struct PHBar: ParsableCommand {
 	static let configuration = CommandConfiguration(
 		commandName: "phbar",
 		abstract: "Modular status bar for macOS.",
 		discussion: """
-			pmenu reads a list of newline-separated items from stdin and presents them to the user.
-			When the user selects an item and presses Return, their choice is printed to stdout and pmenu terminates.
-			Entering text will narrow the items to those matching the tokens in the input.
+			phbar renders a status bar on every visible monitor. Each status bar
+			is dynamically built from the given theme, window configuration,
+			and block set. Thanks to the modularity of phbar, each one of these
+			elements can be overwritten for any given monitor.
+
+			phbar relies on blocks to determine what is visible on a bar and how
+			it should look. Everything in phbar is a block, not just texts but
+			also spaces and dividers. Each block can have a different visual style,
+			refresh conditions, and content source. The content of a block, if any,
+			is computed by calling a shell script, giving you the maximum flexibility.
+
+			Run `phbar install` to create the required config directory filled with
+			a template to start with. The directory will be created in one of these
+			locations in order of priority: $XDG_CONFIG_HOME/phbar, ~/.config/phbar,
+			or ~/.phbar.
+
+			Edit `<config-directory>/blocks/default.toml` to customize the block set used
+			by default and `<config-directory>/themes/default.toml` to customize the look
+			and feel of the bar. Check out the full documentation to learn more about all
+			the possible customisations.
+
+			Run `phbar start` to launch the bar and verify the appearance and behaviour.
+			Once you're ready to go to production, you can create a launch agent that uses
+			the same command to start the bar automatically at login.
 			""",
 		version: "1.0.0",
-		subcommands: [start.self]
+		subcommands: [Start.self, Install.self]
 	)
 }
 
-extension phbar {
+extension PHBar {
 	struct Error: LocalizedError {
 		let message: String
 		let underlyingError: Swift.Error?

Sources/phbar/Views/BackgroundView.swift

@@ -1,17 +1,17 @@
 import AppKit
 
-final class BarWindowBackground: NSView {
-	var hasShadow: Bool {
+final class BackgroundView: NSView {
+	var hasShadow: Bool? = false {
 		didSet { configureShadow() }
 	}
 
-	var blur: CGFloat {
+	var blur: CGFloat? = 0 {
 		didSet { configureBlur() }
 	}
 
-	init(controller: PHController) {
-		self.hasShadow = controller.theme.window.hasShadow
-		self.blur = controller.theme.window.blur
+	init(controller: BarController) {
+		if let hasShadow = controller.window.hasShadow { self.hasShadow = hasShadow }
+		if let blur = controller.window.blur { self.blur = blur }
 		super.init(frame: .zero)
 		setup()
 	}
@@ -36,12 +36,12 @@ final class BarWindowBackground: NSView {
 	}
 
 	private func configureShadow() {
-		guard let window else { return }
+		guard let window, let hasShadow else { return }
 		window.hasShadow = hasShadow
 	}
 
 	private func configureBlur() {
-		guard let window else { return }
+		guard let window, let blur else { return }
 		// Window must be non-opaque for the desktop/other windows behind it
 		// to be visible at all, let alone blurred.
 		window.isOpaque = false

Sources/phbar/Views/BarController.swift

@@ -0,0 +1,106 @@
+import SwiftUI
+
+@MainActor
+final class BarController: ObservableObject {
+	let config: PHConfig
+	let screen: NSScreen
+	let theme: PHTheme
+	let window: PHThemeWindow
+	@Published var blocks: [PHBlock]
+
+	var arrangedBlocks: [PHBlock] {
+		blocks.filter { $0.centered != true }
+	}
+
+	var centeredBlocks: [PHBlock] {
+		blocks.filter { $0.centered == true }
+	}
+
+	init(config: PHConfig, screen: NSScreen, theme: PHTheme, layout: PHLayout, debug: Bool) {
+		self.config = config
+		self.screen = screen
+		self.theme = theme
+		self.window = Self.window(for: config, screen: screen, from: theme)
+		self.blocks = layout.blocks
+
+		for block in blocks {
+			block.text = text(for: block)
+			block.style = style(for: block)
+			block.debug = debug
+		}
+	}
+}
+
+// Theming
+
+extension BarController {
+	/// Resolve the window definition for a given screen, applying any
+	/// per-monitor override from the config. Selection lives on `PHConfig`
+	/// (see `window(screenName:screenIndex:)`); this looks the name up in the
+	/// theme, falling back to "default".
+	static func window(for config: PHConfig, screen: NSScreen, from theme: PHTheme) -> PHThemeWindow {
+		let name = config.window(
+			screenName: screen.localizedName,
+			screenIndex: NSScreen.screens.firstIndex(of: screen)
+		)
+		return resolve(window: name, from: theme)
+	}
+
+	/// Look up a window definition by name, falling back to "default" then the
+	/// built-in default.
+	static func resolve(window name: String, from theme: PHTheme) -> PHThemeWindow {
+		guard let window = theme.windows?.first(where: { $0.name == name }) else {
+			guard let defaultWindow = theme.windows?.first(where: { $0.name == "default" }) else {
+				return PHThemeWindow.default
+			}
+			return defaultWindow
+		}
+		return window
+	}
+
+	func text(for block: PHBlock) -> PHThemeText {
+		guard let text = theme.texts?.first(where: { $0.name == block.textName }) else {
+			guard let defaultText = theme.texts?.first(where: { $0.name == "default" }) else {
+				return PHThemeText.default
+			}
+			return defaultText
+		}
+		return text
+	}
+
+	func style(for block: PHBlock) -> PHThemeStyle {
+		guard let style = theme.styles?.first(where: { $0.name == block.styleName }) else {
+			guard let defaultStyle = theme.styles?.first(where: { $0.name == "default" }) else {
+				return PHThemeStyle.default
+			}
+			return defaultStyle
+		}
+		return style
+	}
+}
+
+// Refresh
+
+extension BarController {
+	/// Start auto-refresh for every block.
+	func startAutoRefresh() {
+		for block in blocks {
+			block.startAutoRefresh()
+		}
+	}
+
+	/// Stop auto-refresh for every block.
+	func stopAutoRefresh() {
+		for block in blocks {
+			block.stopAutoRefresh()
+		}
+	}
+
+	/// Force every block to recompute its label immediately (manual refresh).
+	/// Each block updates concurrently; the view refreshes as results arrive.
+	func refresh() {
+		for block in blocks {
+			block.resolve()
+		}
+	}
+}

Sources/phbar/Views/BarView.swift

@@ -1,9 +1,9 @@
 import SwiftUI
 
 struct BarView: View {
-	@StateObject private var bar: PHController
+	@StateObject private var bar: BarController
 
-	init(controller: PHController) {
+	init(controller: BarController) {
 		self._bar = StateObject(wrappedValue: controller)
 	}
 
@@ -13,9 +13,11 @@ struct BarView: View {
 				ForEach(bar.arrangedBlocks) { block in
 					switch block.kind {
 					case .text:
-						TextBlock(block: block)
+						TextView(block: block)
 					case .space:
-						SpaceBlock(block: block)
+						SpaceView(block: block)
+					case .divider:
+						DividerView(block: block)
 					}
 				}
 			}
@@ -24,16 +26,16 @@ struct BarView: View {
 				ForEach(bar.centeredBlocks) { block in
 					switch block.kind {
 					case .text:
-						TextBlock(block: block)
+						TextView(block: block)
 					case .space:
-						SpaceBlock(block: block)
+						SpaceView(block: block)
+					case .divider:
+						DividerView(block: block)
 					}
 				}
 			}
 		}
-		.font(bar.config.text.font)
-		.italic(bar.config.text.italic)
-		.frame(height: 30)
+		.frame(height: bar.window.height ?? 30)
 		.ignoresSafeArea()
 		.environmentObject(bar)
 	}

Sources/phbar/Views/BarWindow.swift

@@ -2,12 +2,12 @@ import AppKit
 import SwiftUI
 
 final class BarWindow: NSPanel {
-	let barController: PHController
+	let barController: BarController
 
-	var backgroundView: BarWindowBackground!
+	var backgroundView: BackgroundView!
 	var barView: NSHostingView<BarView>!
 
-	init(controller: PHController) {
+	init(controller: BarController) {
 		self.barController = controller
 
 		super.init(
@@ -32,7 +32,7 @@ final class BarWindow: NSPanel {
 		self.isRestorable = false
 		self.displaysWhenScreenProfileChanges = true
 
-		self.backgroundView = BarWindowBackground(controller: barController)
+		self.backgroundView = BackgroundView(controller: barController)
 		backgroundView.autoresizingMask = [.width, .height]
 		backgroundView.frame = self.contentView?.bounds ?? .zero
 
@@ -46,13 +46,48 @@ final class BarWindow: NSPanel {
 }
 
 extension BarWindow {
-	/// Calculate window frame and position.
-	static func computeFrame(from controller: PHController) -> NSRect {
-		let screenFrame = controller.screen.frame
-		let height: CGFloat = 30
-		let x = screenFrame.minX
-		let y = screenFrame.maxY - height
+	/// Recompute and apply the frame from the controller's screen and theme.
+	/// Used when a screen's geometry changes (resolution, layout) so the bar
+	/// stays correctly anchored without rebuilding the whole window.
+	func recomputeFrame() {
+		setFrame(Self.computeFrame(from: barController), display: true)
+	}
 
-		return NSRect(x: x, y: y, width: screenFrame.width, height: height)
+	/// Calculate window frame and position from the theme window definition,
+	/// resolved against the controller's screen.
+	static func computeFrame(from controller: BarController) -> NSRect {
+		let screenFrame = controller.screen.frame
+		let themeWindow = controller.window
+
+		// Absolute origin bypasses the anchor/margin system entirely: width
+		// resolves against the full screen and the window sits at the exact
+		// coordinates given.
+		if let origin = themeWindow.origin {
+			let size = CGSize(
+				width: (themeWindow.width ?? .percentage(1.0)).resolve(against: screenFrame.width),
+				height: CGFloat(themeWindow.height ?? 30)
+			)
+			return NSRect(
+				x: CGFloat(origin.x),
+				y: CGFloat(origin.y),
+				width: size.width,
+				height: size.height
+			)
+		}
+
+		// Margins define a content rectangle within the screen: the window is
+		// sized against it (so `width = "100%"` spans only between the margins,
+		// not the full screen) and placed by the anchor inside it.
+		let margin = themeWindow.margin ?? .init()
+		let contentRect = margin.inset(of: screenFrame)
+		let size = CGSize(
+			width: (themeWindow.width ?? .percentage(1.0)).resolve(against: contentRect.width),
+			height: CGFloat(themeWindow.height ?? 30)
+		)
+		let anchor = themeWindow.anchor ?? .top
+		return NSRect(
+			origin: anchor.origin(in: contentRect, size: size),
+			size: size
+		)
 	}
 }

Sources/phbar/Views/Blocks/TextBlock.swift

@@ -1,49 +0,0 @@
-import SwiftUI
-
-struct TextBlock: View {
-	@EnvironmentObject private var bar: PHController
-	@ObservedObject var block: PHBlock
-
-	@State var hovering = false
-
-	private var adjustOffset: CGAffineTransform {
-		guard let offset = bar.config.text.offset else { return .init() }
-		return .init(translationX: 0, y: offset)
-	}
-
-	var body: some View {
-		if let label = block.label, !label.isEmpty {
-			ZStack(alignment: .center) {
-				RoundedRectangle(cornerRadius: 0)
-					.fill(block.style.background)
-
-				Group {
-					Text(label)
-						.foregroundStyle(block.style.foreground)
-						.transformEffect(adjustOffset)
-						.border(bar.debug ? .blue : .clear)
-				}
-				.padding(.leading, block.style.padding.leading)
-				.padding(.trailing, block.style.padding.trailing)
-			}
-			.fixedSize(horizontal: true, vertical: false)
-			.border(bar.debug ? .red : .clear)
-			.onHover { hovering = $0 }
-			.onAppear {
-				NSEvent.addLocalMonitorForEvents(matching: [
-					.leftMouseDown,
-					.rightMouseDown,
-					.otherMouseDown,
-					.scrollWheel,
-				]) { event in
-					if hovering, let gestureEvent = PHGestureEvent.from(event) {
-						block.handleGesture(gestureEvent)
-					}
-					return event
-				}
-			}
-		} else {
-			EmptyView()
-		}
-	}
-}

Sources/phbar/Views/DividerView.swift

@@ -0,0 +1,35 @@
+import SwiftUI
+
+struct DividerView: View {
+	@ObservedObject var block: PHBlock
+
+	var width: CGFloat {
+		guard let arg = block.name.split(separator: " ").last else { return 1 }
+		guard let width = Double(arg) else { return 1 }
+		return CGFloat(width)
+	}
+
+	var body: some View {
+		ZStack {
+			Rectangle()
+				.foregroundStyle(block.style.background?.uiColor ?? .clear)
+
+			Group {
+				if let corner = block.style.corner {
+					RoundedRectangle(cornerRadius: corner.radius, style: corner.style)
+				} else {
+					Rectangle()
+				}
+			}
+			.foregroundStyle(block.style.foreground?.uiColor ?? .clear)
+			.frame(width: width)
+			.padding(.trailing, block.style.padding?.trailing ?? 0)
+			.padding(.leading, block.style.padding?.leading ?? 0)
+			.padding(.top, block.style.padding?.top ?? 0)
+			.padding(.bottom, block.style.padding?.bottom ?? 0)
+			.border(block.debug ? .blue : .clear)
+		}
+		.fixedSize(horizontal: true, vertical: false)
+		.border(block.debug ? .red : .clear)
+	}
+}

Sources/phbar/Views/SpaceView.swift

@@ -1,17 +1,17 @@
 import SwiftUI
 
-struct SpaceBlock: View {
+struct SpaceView: View {
 	@ObservedObject var block: PHBlock
 
 	var width: CGFloat? {
-		guard let arg = block.command.split(separator: " ").last else { return nil }
+		guard let arg = block.name.split(separator: " ").last else { return nil }
 		guard let width = Double(arg) else { return nil }
 		return CGFloat(width)
 	}
 
 	var body: some View {
 		Rectangle()
-			.fill(block.style.background)
+			.fill(block.style.background?.uiColor ?? .clear)
 			.frame(width: width)
 	}
 }

Sources/phbar/Views/TextView.swift

@@ -0,0 +1,59 @@
+import SwiftUI
+
+struct TextView: View {
+	@EnvironmentObject private var bar: BarController
+	@ObservedObject var block: PHBlock
+
+	@State var hovering = false
+
+	private var adjustOffset: CGAffineTransform {
+		guard let offset = block.text.offset else { return .init() }
+		return .init(translationX: 0, y: offset)
+	}
+
+	var body: some View {
+		if let label = block.label, !label.isEmpty {
+			ZStack(alignment: .center) {
+				Group {
+					if let corner = block.style.corner {
+						RoundedRectangle(cornerRadius: corner.radius, style: corner.style)
+					} else {
+						Rectangle()
+					}
+				}
+				.foregroundStyle(block.style.background?.uiColor ?? .clear)
+
+				Group {
+					Text(label)
+						.font(block.text.font)
+						.italic(block.text.italic)
+						.foregroundStyle(block.style.foreground?.uiColor ?? .clear)
+						.transformEffect(adjustOffset)
+						.border(block.debug ? .blue : .clear)
+				}
+				.padding(.trailing, block.style.padding?.trailing ?? 0)
+				.padding(.leading, block.style.padding?.leading ?? 0)
+				.padding(.top, block.style.padding?.top ?? 0)
+				.padding(.bottom, block.style.padding?.bottom ?? 0)
+			}
+			.fixedSize(horizontal: true, vertical: false)
+			.border(block.debug ? .red : .clear)
+			.onHover { hovering = $0 }
+			.onAppear {
+				NSEvent.addLocalMonitorForEvents(matching: [
+					.leftMouseDown,
+					.rightMouseDown,
+					.otherMouseDown,
+					.scrollWheel,
+				]) { event in
+					if hovering, let gestureEvent = PHGestureEvent.from(event) {
+						block.resolve(with: gestureEvent)
+					}
+					return event
+				}
+			}
+		} else {
+			EmptyView()
+		}
+	}
+}

Sources/phbar/config/config.toml

@@ -0,0 +1,21 @@
+# Default window and block set for every monitor.
+#   - theme: a named theme at ~/.config/phbar/themes/<name>.toml
+#   - window: a [[window]] definition from the theme file
+#   - layout: a named layout at ~/.config/phbar/layouts/<name>.toml
+theme  = "default"
+window = "default"
+layout = "default"
+
+# Optional: override the window and/or layout per monitor.
+#   - quoted numeric key → NSScreen index
+#   - string key         → NSScreen.localizedName (stable across replugs)
+# Precedence: monitor name → monitor index → the globals above.
+# Either field may be omitted to inherit its global value.
+#
+# [monitor."1"]
+# window = "bottom"
+# layout = "laptop"
+#
+# [monitor."DELL U2723QE"]
+# window = "clock"
+# layout = "external"

Sources/phbar/config/layouts/default.toml

@@ -0,0 +1,31 @@
+[[block]]
+name  = "version"
+style = "elevated"
+
+[[block]]
+name = "_space 14"
+
+[[block]]
+name    = "attribution"
+command = 'echo "by Panini House"'
+text    = "italic"
+
+[[block]]
+name = "_space"
+
+[[block]]
+name = "gesture"
+
+[[block]]
+name = "_space 14"
+
+[[block]]
+name    = "clock"
+refresh = 1
+style   = "elevated"
+
+[[block]]
+name     = "greetings"
+command  = 'echo "􀟱 Hi $USER", welcome to phbar!'
+text     = "italic"
+centered = true

Sources/phbar/config/scripts/clock

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "􀐬 $(date "+%a %d, %H:%M:%S")"

Sources/phbar/config/scripts/gesture

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+text="Click me"
+
+case $GESTURE in
+	"left_mouse_down") text="That's left mouse button!" ;;
+	"right_mouse_down") text="That's right mouse button!" ;;
+	"other_mouse_down") text="That's mouse button $GESTURE_INFO!" ;;
+	"scroll_wheel") text="Yes, you can even scroll!" ;;
+esac
+
+echo "􀭆 $text"

Sources/phbar/config/scripts/version

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "phbar v$(phbar --version)"

Sources/phbar/config/themes/default.toml

@@ -0,0 +1,36 @@
+# phbar theme file
+#
+# Place at ~/.config/phbar/themes/default.toml
+
+[[window]]
+name   = "default"
+anchor = "top"
+height = 30
+width  = "100%"
+
+[[text]]
+name   = "default"
+font   = "monospace"
+size   = 14
+weight = "regular"
+style  = "normal"
+offset = -1
+
+[[text]]
+name   = "italic"
+font   = "monospace"
+size   = 14
+weight = "regular"
+style  = "italic"
+offset = -1
+
+[[style]]
+name       = "default"
+foreground = { color = "#aed3f3" }
+background = { color = "#010408" }
+
+[[style]]
+name       = "elevated"
+foreground = { color = "#aed3f3" }
+background = { color = "#0f304a" }
+padding    = { left = 12.0, right = 12.0 }

Sources/phbarEvents/PHEventRecognizer.swift

@@ -4,9 +4,9 @@ import Foundation
 ///
 /// phbar ships a set of built-in recognizers (volume, network, appearance,
 /// power, mpd) compiled into the host. External recognizers are loaded at
-/// runtime as shared libraries from `~/.config/phbar/events/<name>/` and conform
-/// to this same protocol, so the host drives built-in and external recognizers
-/// through one shape.
+/// runtime as shared libraries from the events directory
+/// (`<config>/events/<name>/`) and conform to this same protocol, so the host
+/// drives built-in and external recognizers through one shape.
 ///
 /// Conform an `NSObject` subclass and export a zero-argument factory via
 /// `@_cdecl(PHEventCreateSymbol)`:

Tests/phbarTests/AppDelegateTests.swift

@@ -0,0 +1,78 @@
+import AppKit
+import Foundation
+import Testing
+
+@testable import phbar
+
+@MainActor
+struct AppDelegateTests {
+
+	// MARK: - ScreenSync.diff
+
+	@Test func diffReportsAddedWhenNothingOccupied() throws {
+		let screen = try #require(NSScreen.main)
+		let plan = PHScreenSync.diff(current: [screen], occupied: [])
+		#expect(plan.added == [screen])
+		#expect(plan.removed.isEmpty)
+		#expect(plan.kept.isEmpty)
+	}
+
+	@Test func diffReportsRemovedWhenScreenGone() throws {
+		let screen = try #require(NSScreen.main)
+		let plan = PHScreenSync.diff(current: [], occupied: [screen])
+		#expect(plan.removed == [screen])
+		#expect(plan.added.isEmpty)
+		#expect(plan.kept.isEmpty)
+	}
+
+	@Test func diffKeepsScreenStillAttached() throws {
+		let screen = try #require(NSScreen.main)
+		let plan = PHScreenSync.diff(current: [screen], occupied: [screen])
+		#expect(plan.kept == [screen])
+		#expect(plan.added.isEmpty)
+		#expect(plan.removed.isEmpty)
+	}
+
+	/// A disconnected monitor reappears as a *new* `NSScreen` instance, so the
+	/// same physical display must be reported as remove + add, never a keep.
+	@Test func diffTreatsDistinctInstancesAsRemoveThenAdd() throws {
+		let main = try #require(NSScreen.main)
+		guard let other = NSScreen.screens.first(where: { $0 !== main }) else {
+			// Single-monitor environment: nothing to contrast against. Verify
+			// identity semantics hold for the same object re-presented instead.
+			let kept = PHScreenSync.diff(current: [main], occupied: [main])
+			#expect(kept.kept == [main])
+			return
+		}
+
+		let plan = PHScreenSync.diff(current: [other], occupied: [main])
+		#expect(plan.removed == [main])
+		#expect(plan.added == [other])
+		#expect(plan.kept.isEmpty)
+	}
+
+	@Test func diffIgnoresOrdering() throws {
+		let main = try #require(NSScreen.main)
+		guard let other = NSScreen.screens.first(where: { $0 !== main }) else {
+			// Single-monitor environment: ordering is trivially stable.
+			return
+		}
+		let plan = PHScreenSync.diff(current: [other, main], occupied: [main, other])
+		#expect(Set(plan.kept.map(ObjectIdentifier.init)) == Set([main, other].map(ObjectIdentifier.init)))
+		#expect(plan.added.isEmpty)
+		#expect(plan.removed.isEmpty)
+	}
+
+	// MARK: - BarControllerFactory
+
+	@Test func factoryBuildsControllerForScreen() throws {
+		let screen = try #require(NSScreen.main)
+		let config = try PHConfig.load()
+		let factory = PHBarFactory(config: config, environment: .process, debug: false)
+
+		let controller = try factory.make(for: screen)
+
+		#expect(controller.screen === screen)
+		#expect(controller.blocks.isEmpty == false)
+	}
+}

Tests/phbarTests/BarControllerTests.swift

@@ -0,0 +1,41 @@
+import AppKit
+import Foundation
+import Testing
+
+@testable import phbar
+
+// MARK: - Refresh command
+
+@Test func refreshCommandConfigurationIsCorrect() async throws {
+	let config = PHBar.Refresh.configuration
+	#expect(config.commandName == "refresh")
+	#expect(config.abstract == "Refresh the running status bar.")
+}
+
+// MARK: - BarController refresh
+
+@MainActor
+@Test func controllerRefreshUpdatesAllBlocks() async throws {
+	let screen = try #require(NSScreen.main)
+	let blocks = try PHBlock.load(from: """
+	[[block]]
+	command = "printf a"
+	name = "a"
+
+	[[block]]
+	command = "printf b"
+	name = "b"
+	""")
+
+	let config = try PHConfig.load()
+	let theme = try PHTheme.load("voltage")
+	let controller = BarController(config: config, screen: screen, theme: theme, blocks: blocks, debug: false)
+
+	controller.refresh()
+
+	// Allow the per-block update tasks to run.
+	try await Task.sleep(for: .milliseconds(100))
+
+	#expect(blocks[0].label == "a")
+	#expect(blocks[1].label == "b")
+}

Tests/phbarTests/IPCTests.swift

@@ -0,0 +1,82 @@
+import Foundation
+import Testing
+
+@testable import phbar
+
+// MARK: - Payload Types for Testing
+
+private struct TestPayload: Codable, Equatable {
+	let message: String
+	let count: Int
+}
+
+// MARK: - Notification Name
+
+@Test func notificationNameIsHashable() async throws {
+	let a = IPCNotificationName("com.example.test")
+	let b = IPCNotificationName("com.example.test")
+	let c = IPCNotificationName("com.example.other")
+
+	#expect(a == b)
+	#expect(a != c)
+	#expect(a.hashValue == b.hashValue)
+}
+
+@Test func notificationNameIsExpressibleByStringLiteral() async throws {
+	let name: IPCNotificationName = "com.example.test"
+	#expect(name.rawValue == "com.example.test")
+}
+
+@Test func notificationNameRawRepresentable() async throws {
+	let name = IPCNotificationName(rawValue: "com.example.test")
+	#expect(name.rawValue == "com.example.test")
+}
+
+// MARK: - Payload Decoding
+
+@Test func decodePayloadFromNotification() async throws {
+	let payload = TestPayload(message: "hello", count: 42)
+	let userInfo: [String: Any] = ["message": "hello", "count": 42]
+	let notification = IPCNotification(name: .refresh, userInfo: userInfo)
+
+	let decoded: TestPayload? = notification.decode(TestPayload.self)
+	#expect(decoded == payload)
+}
+
+@Test func decodePayloadReturnsNilForMissingUserInfo() async throws {
+	let notification = IPCNotification(name: .refresh, userInfo: nil)
+	let decoded: TestPayload? = notification.decode(TestPayload.self)
+	#expect(decoded == nil)
+}
+
+@Test func decodePayloadReturnsNilForInvalidData() async throws {
+	let userInfo: [String: Any] = ["wrong": "data"]
+	let notification = IPCNotification(name: .refresh, userInfo: userInfo)
+	let decoded: TestPayload? = notification.decode(TestPayload.self)
+	#expect(decoded == nil)
+}
+
+// MARK: - Posting
+
+@Test func postWithoutPayloadDoesNotCrash() async throws {
+	IPC.post(.refresh)
+}
+
+@Test func postWithUserInfoDoesNotCrash() async throws {
+	IPC.post(.refresh, userInfo: ["key": "value"])
+}
+
+@Test func postWithEncodablePayloadDoesNotCrash() async throws {
+	let payload = TestPayload(message: "test", count: 1)
+	let result = IPC.post(.refresh, payload: payload)
+	#expect(result == true)
+}
+
+// MARK: - Observer
+
+@Test func observerCleansUpOnDeinit() async throws {
+	// Verify that creating and releasing an observer doesn't crash.
+	// The token removes itself from the distributed center on deinit.
+	let token = IPC.observe(.refresh) { _ in }
+	withExtendedLifetime(token) {}
+}

Tests/phbarTests/PHBlockTests.swift

@@ -0,0 +1,189 @@
+import AppKit
+import Foundation
+import Testing
+
+@testable import phbar
+
+// MARK: - Loading
+
+@MainActor
+@Test func loadBlocksFromTOML() throws {
+	let toml = """
+	[[block]]
+	command = "echo hello"
+	name = "greeting"
+	refresh = 5.0
+
+	[[block]]
+	command = "echo world"
+	name = "world"
+	"""
+
+	let blocks = try PHBlock.load(from: toml)
+
+	#expect(blocks.count == 2)
+	#expect(blocks[0].command == "echo hello")
+	#expect(blocks[0].name == "greeting")
+	#expect(blocks[0].refresh == 5.0)
+	#expect(blocks[0].label == nil)
+	#expect(blocks[1].name == "world")
+	#expect(blocks[1].refresh == nil)
+}
+
+@MainActor
+@Test func loadBlocksRejectsInvalidTOML() {
+	#expect(throws: (any Error).self) {
+		try PHBlock.load(from: "not = valid = toml = =")
+	}
+}
+
+// MARK: - Named set loading
+
+private func makeBlocksConfigDir() throws -> URL {
+	let dir = FileManager.default.temporaryDirectory.appending(path: "phbar_blocks_\(UUID().uuidString)")
+	try FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
+	return dir
+}
+
+@MainActor
+@Test func loadSetReadsNamedFile() throws {
+	let dir = try makeBlocksConfigDir()
+	defer { try? FileManager.default.removeItem(at: dir) }
+
+	let blocksDir = dir.appending(path: "blocks")
+	try FileManager.default.createDirectory(at: blocksDir, withIntermediateDirectories: true)
+	try Data("""
+	[[block]]
+	command = "echo hi"
+	name = "greeting"
+	""".utf8).write(to: blocksDir.appending(path: "laptop.toml"))
+
+	let blocks = try PHBlock.load("laptop", in: dir)
+
+	#expect(blocks.count == 1)
+	#expect(blocks[0].name == "greeting")
+}
+
+@MainActor
+@Test func loadSetThrowsForMissingSet() {
+	let dir = FileManager.default.temporaryDirectory.appending(path: "phbar_missing_\(UUID().uuidString)")
+	#expect(throws: (any Error).self) {
+		try PHBlock.load("nope", in: dir)
+	}
+}
+
+// MARK: - Compute
+
+@MainActor
+@Test func computeSeesBlockEnvironment() async throws {
+	// The `[env]` section (overlaid by `BarController`) must reach the script's
+	// process environment — this is the wiring the `env` config documents.
+	let block = try PHBlock.load(from: """
+	[[block]]
+	name = "env"
+	command = "echo $PHBAR_TEST_VAR"
+	""")[0]
+	block.environment = PHEnvironment(variables: ["PHBAR_TEST_VAR": "panini"])
+
+	let output = await block.compute()
+
+	#expect(output == "panini")
+}
+
+@MainActor
+@Test func computeReturnsCommandStdout() async throws {
+	let blocks = try PHBlock.load(from: """
+	[[block]]
+	command = "printf panini"
+	name = "panini"
+	""")
+
+	let output = await blocks[0].compute()
+
+	#expect(output == "panini")
+}
+
+@MainActor
+@Test func computeRunsInConfigDirectory() async throws {
+	// Block commands execute with the resolved config root (see `PHPaths`) as
+	// their working directory, so a block from any set resolves relative paths
+	// the same way. Guards against the config dir being absent in sandboxed CIs.
+	guard FileManager.default.fileExists(atPath: PHPaths.configDirectory.path) else { return }
+
+	let blocks = try PHBlock.load(from: """
+	[[block]]
+	command = "pwd"
+	name = "pwd"
+	""")
+
+	let output = await blocks[0].compute()
+
+	// Resolve symlinks on both sides: the config dir is commonly a symlink into
+	// a dotfiles repo, and `pwd` reports the physical path.
+	let expected = PHPaths.configDirectory.resolvingSymlinksInPath().path
+	#expect(output == expected)
+}
+
+// MARK: - Auto-refresh
+
+@MainActor
+@Test func updateSetsLabel() async throws {
+	let block = try PHBlock.load(from: """
+	[[block]]
+	command = "printf panini"
+	name = "panini"
+	""")[0]
+
+	#expect(block.label == nil)
+
+	await block.update()
+
+	#expect(block.label == "panini")
+}
+
+@MainActor
+@Test func startAutoRefreshWithoutIntervalComputesOnce() async throws {
+	let block = try PHBlock.load(from: """
+	[[block]]
+	command = "printf hi"
+	name = "hi"
+	""")[0]
+
+	block.startAutoRefresh()
+
+	// Allow the one-shot update task to run.
+	try await Task.sleep(for: .milliseconds(100))
+
+	#expect(block.label == "hi")
+
+	block.stopAutoRefresh()
+}
+
+@MainActor
+@Test func startAutoRefreshRepeatsAtInterval() async throws {
+	// A counter file lets us observe how many times the command ran.
+	let counter = FileManager.default.temporaryDirectory
+		.appending(path: "phbar_test_\(UUID().uuidString)")
+	defer { try? FileManager.default.removeItem(at: counter) }
+
+	let path = counter.path
+	let toml = """
+	[[block]]
+	command = "n=$(cat \(path) 2>/dev/null || echo 0); n=$((n+1)); echo $n > \(path); echo $n"
+	name = "counter"
+	refresh = 0.05
+	"""
+
+	let block = try PHBlock.load(from: toml)[0]
+
+	block.startAutoRefresh()
+
+	try await Task.sleep(for: .milliseconds(250))
+
+	block.stopAutoRefresh()
+
+	let count = Int(block.label!.trimmingCharacters(in: .whitespacesAndNewlines)) ?? 0
+
+	// At ~20Hz over 250ms the command should have run more than once.
+	#expect(count >= 2)
+}

Tests/phbarTests/PHConfigTests.swift

@@ -0,0 +1,112 @@
+import Foundation
+import Testing
+
+@testable import phbar
+
+// MARK: - Per-monitor resolution
+//
+// `PHConfig` exposes one resolution API: `theme`/`window`/`blocks`/
+// `monitorOverride`, each taking a pure `(screenName, screenIndex)` pair.
+// Precedence for every field: override-by-name → override-by-index → global.
+
+/// Build a `PHConfig` with sensible defaults so each test only spells out the
+/// fields it cares about.
+private func makeConfig(
+	theme: String = "default",
+	window: String = "default",
+	blocks: String? = nil,
+	monitors: [String: PHConfigMonitorOverride]? = nil
+) -> PHConfig {
+	PHConfig(theme: theme, window: window, blocks: blocks, env: nil, monitors: monitors)
+}
+
+// MARK: window
+
+@Test func windowFallsBackToGlobal() {
+	let config = makeConfig(window: "top")
+	#expect(config.window(screenName: "Built-in", screenIndex: 0) == "top")
+}
+
+@Test func windowMatchesByIndex() {
+	let config = makeConfig(monitors: ["1": .init(window: "bottom", layout: nil)])
+	#expect(config.window(screenName: "Whatever", screenIndex: 1) == "bottom")
+}
+
+@Test func windowMatchesByName() {
+	let config = makeConfig(monitors: ["DELL U2723QE": .init(window: "clock", layout: nil)])
+	#expect(config.window(screenName: "DELL U2723QE", screenIndex: 0) == "clock")
+}
+
+@Test func windowPrefersNameOverIndex() {
+	let config = makeConfig(monitors: [
+		"0": .init(window: "byIndex", layout: nil),
+		"DELL": .init(window: "byName", layout: nil),
+	])
+	#expect(config.window(screenName: "DELL", screenIndex: 0) == "byName")
+}
+
+// MARK: blocks
+
+@Test func blocksDefaultsToDefault() {
+	#expect(makeConfig().layout(screenName: "S", screenIndex: 0) == "default")
+}
+
+@Test func blocksUsesGlobalWhenNoOverride() {
+	let config = makeConfig(blocks: "main")
+	#expect(config.layout(screenName: "S", screenIndex: 0) == "main")
+}
+
+@Test func blocksOverrideBeatsGlobal() {
+	let config = makeConfig(blocks: "main", monitors: ["1": .init(window: nil, layout: "alt")])
+	#expect(config.layout(screenName: "S", screenIndex: 1) == "alt")
+}
+
+// MARK: theme
+
+@Test func themeFallsBackToGlobal() {
+	let config = makeConfig(theme: "voltage")
+	#expect(config.theme(screenName: "S", screenIndex: 0) == "voltage")
+}
+
+@Test func themeOverrideBeatsGlobal() {
+	let config = makeConfig(theme: "voltage", monitors: ["1": .init(theme: "mono", window: nil, blocks: nil)])
+	#expect(config.theme(screenName: "S", screenIndex: 1) == "mono")
+}
+
+// MARK: independence
+
+@Test func overrideInheritsUnsetFieldsFromGlobal() {
+	// An override that sets only `blocks` still inherits the global window/theme.
+	let config = makeConfig(theme: "voltage", window: "top", monitors: ["1": .init(window: nil, layout: "laptop")])
+	#expect(config.theme(screenName: "S", screenIndex: 1) == "voltage")
+	#expect(config.window(screenName: "S", screenIndex: 1) == "top")
+	#expect(config.layout(screenName: "S", screenIndex: 1) == "laptop")
+}
+
+@Test func themeWindowAndBlocksResolveIndependently() {
+	let config = makeConfig(
+		theme: "voltage", window: "top", blocks: "main",
+		monitors: [
+			"DELL": .init(theme: "mono", window: "clock", blocks: nil), // inherits blocks "main"
+			"1": .init(theme: nil, window: nil, blocks: "laptop"),       // inherits theme/window
+		]
+	)
+	#expect(config.theme(screenName: "DELL", screenIndex: 0) == "mono")
+	#expect(config.window(screenName: "DELL", screenIndex: 0) == "clock")
+	#expect(config.blocks(screenName: "DELL", screenIndex: 0) == "main")
+
+	#expect(config.theme(screenName: "S", screenIndex: 1) == "voltage")
+	#expect(config.window(screenName: "S", screenIndex: 1) == "top")
+	#expect(config.blocks(screenName: "S", screenIndex: 1) == "laptop")
+}
+
+// MARK: monitorOverride
+
+@Test func monitorOverrideReturnsNilWhenTableAbsent() {
+	#expect(makeConfig().monitorOverride(screenName: "S", screenIndex: 0) == nil)
+}
+
+@Test func monitorOverrideReturnsNilForUnmatchedScreen() {
+	let config = makeConfig(monitors: ["DELL": .init(window: "clock", layout: nil)])
+	#expect(config.monitorOverride(screenName: "Unknown", screenIndex: 99) == nil)
+}

Tests/phbarTests/PHEventTests.swift

@@ -1,258 +1,9 @@
-import AppKit
 import Foundation
 import Testing
 
 @testable import phbar
 
-// MARK: - Payload Types for Testing
-
-private struct TestPayload: Codable, Equatable {
-	let message: String
-	let count: Int
-}
-
-// MARK: - Notification Name Tests
-
-@Test func notificationNameIsHashable() async throws {
-	let a = IPCNotificationName("com.example.test")
-	let b = IPCNotificationName("com.example.test")
-	let c = IPCNotificationName("com.example.other")
-
-	#expect(a == b)
-	#expect(a != c)
-	#expect(a.hashValue == b.hashValue)
-}
-
-@Test func notificationNameIsExpressibleByStringLiteral() async throws {
-	let name: IPCNotificationName = "com.example.test"
-	#expect(name.rawValue == "com.example.test")
-}
-
-@Test func notificationNameRawRepresentable() async throws {
-	let name = IPCNotificationName(rawValue: "com.example.test")
-	#expect(name.rawValue == "com.example.test")
-}
-
-// MARK: - Payload Decoding Tests
-
-@Test func decodePayloadFromNotification() async throws {
-	let payload = TestPayload(message: "hello", count: 42)
-	let userInfo: [String: Any] = ["message": "hello", "count": 42]
-	let notification = IPCNotification(name: .refresh, userInfo: userInfo)
-
-	let decoded: TestPayload? = notification.decode(TestPayload.self)
-	#expect(decoded == payload)
-}
-
-@Test func decodePayloadReturnsNilForMissingUserInfo() async throws {
-	let notification = IPCNotification(name: .refresh, userInfo: nil)
-	let decoded: TestPayload? = notification.decode(TestPayload.self)
-	#expect(decoded == nil)
-}
-
-@Test func decodePayloadReturnsNilForInvalidData() async throws {
-	let userInfo: [String: Any] = ["wrong": "data"]
-	let notification = IPCNotification(name: .refresh, userInfo: userInfo)
-	let decoded: TestPayload? = notification.decode(TestPayload.self)
-	#expect(decoded == nil)
-}
-
-// MARK: - Posting Tests
-
-@Test func postWithoutPayloadDoesNotCrash() async throws {
-	IPC.post(.refresh)
-}
-
-@Test func postWithUserInfoDoesNotCrash() async throws {
-	IPC.post(.refresh, userInfo: ["key": "value"])
-}
-
-@Test func postWithEncodablePayloadDoesNotCrash() async throws {
-	let payload = TestPayload(message: "test", count: 1)
-	let result = IPC.post(.refresh, payload: payload)
-	#expect(result == true)
-}
-
-// MARK: - Observer Tests
-
-@Test func observerCleansUpOnDeinit() async throws {
-	// Verify that creating and releasing an observer doesn't crash.
-	// The token removes itself from the distributed center on deinit.
-	let token = IPC.observe(.refresh) { _ in }
-	withExtendedLifetime(token) {}
-}
-
-// MARK: - Refresh Command Config
-
-@Test func refreshCommandConfigurationIsCorrect() async throws {
-	let config = phbar.refresh.configuration
-	#expect(config.commandName == "refresh")
-	#expect(config.abstract == "Refresh the running status bar.")
-}
-
-// MARK: - PHBlock Loading & Compute
-
-@MainActor
-@Test func loadBlocksFromTOML() throws {
-	let toml = """
-	[[block]]
-	command = "echo hello"
-	name = "greeting"
-	refresh = 5.0
-
-	[[block]]
-	command = "echo world"
-	"""
-
-	let blocks = try PHBlock.load(from: toml)
-
-	#expect(blocks.count == 2)
-	#expect(blocks[0].command == "echo hello")
-	#expect(blocks[0].name == "greeting")
-	#expect(blocks[0].refresh == 5.0)
-	#expect(blocks[0].label == "")
-	#expect(blocks[1].name == nil)
-	#expect(blocks[1].refresh == nil)
-}
-
-@MainActor
-@Test func loadBlocksRejectsInvalidTOML() {
-	#expect(throws: (any Error).self) {
-		try PHBlock.load(from: "not = valid = toml = =")
-	}
-}
-
-@MainActor
-@Test func computeReturnsCommandStdout() async throws {
-	let blocks = try PHBlock.load(from: """
-	[[block]]
-	command = "printf panini"
-	""")
-
-	let output = await blocks[0].compute()
-
-	#expect(output == "panini")
-}
-
-// MARK: - PHBlock Refresh
-
-@MainActor
-@Test func updateSetsLabel() async throws {
-	let block = try PHBlock.load(from: """
-	[[block]]
-	command = "printf panini"
-	""")[0]
-
-	#expect(block.label == "")
-
-	await block.update()
-
-	#expect(block.label == "panini")
-}
-
-@MainActor
-@Test func startAutoRefreshWithoutIntervalComputesOnce() async throws {
-	let block = try PHBlock.load(from: """
-	[[block]]
-	command = "printf hi"
-	""")[0]
-
-	block.startAutoRefresh()
-
-	// Allow the one-shot update task to run.
-	try await Task.sleep(for: .milliseconds(100))
-
-	#expect(block.label == "hi")
-
-	block.stopAutoRefresh()
-}
-
-@MainActor
-@Test func startAutoRefreshRepeatsAtInterval() async throws {
-	// A counter file lets us observe how many times the command ran.
-	let counter = FileManager.default.temporaryDirectory
-		.appending(path: "phbar_test_\(UUID().uuidString)")
-	defer { try? FileManager.default.removeItem(at: counter) }
-
-	let path = counter.path
-	let toml = """
-	[[block]]
-	command = "n=$(cat \(path) 2>/dev/null || echo 0); n=$((n+1)); echo $n > \(path); echo $n"
-	refresh = 0.05
-	"""
-
-	let block = try PHBlock.load(from: toml)[0]
-
-	block.startAutoRefresh()
-
-	try await Task.sleep(for: .milliseconds(250))
-
-	block.stopAutoRefresh()
-
-	let count = Int(block.label!.trimmingCharacters(in: .whitespacesAndNewlines)) ?? 0
-
-	// At ~20Hz over 250ms the command should have run more than once.
-	#expect(count >= 2)
-}
-
-// MARK: - PHEvent
-
-@MainActor
-@Test func eventDecodesFromKnownStrings() throws {
-	let toml = """
-	[[block]]
-	command = "echo hi"
-	events = ["volume", "network", "appearance", "power", "mpd"]
-	"""
-
-	let blocks = try PHBlock.load(from: toml)
-
-	#expect(blocks[0].events == [PHEvent("volume"), PHEvent("network"), PHEvent("appearance"), PHEvent("power"), PHEvent("mpd")])
-}
-
-@MainActor
-@Test func eventAcceptsArbitraryStringAsCustom() throws {
-	// Unknown strings no longer fail decoding: they become custom event names
-	// resolved at runtime against ~/.config/phbar/events/<name>/.
-	let blocks = try PHBlock.load(from: """
-	[[block]]
-	command = "echo hi"
-	events = ["totally_made_up"]
-	""")
-
-	#expect(blocks[0].events == [PHEvent("totally_made_up")])
-}
-
-@MainActor
-@Test func eventsOptionalWhenOmitted() throws {
-	let blocks = try PHBlock.load(from: """
-	[[block]]
-	command = "echo hi"
-	""")
-
-	#expect(blocks[0].events == nil)
-}
-
-@MainActor
-@Test func defaultFactoryReturnsNilWithoutRecognizer() {
-	// No recognizer installed at a clean directory → factory yields nil.
-	let loader = PHEventLoader(directory: FileManager.default.temporaryDirectory)
-	let factory: @MainActor @Sendable (PHEvent) -> (any PHEventSource)? = { event in
-		guard let recognizer = loader.recognizer(for: event.rawValue) else { return nil }
-		return PHExternalEventSource(recognizer: recognizer)
-	}
-	#expect(factory(PHEvent("anything")) == nil)
-}
-
-@MainActor
-@Test func eventLoaderReturnsNilForMissingEvent() {
-	// A clean directory has no event folders, so every name fails to load.
-	let loader = PHEventLoader(directory: FileManager.default.temporaryDirectory)
-	let recognizer = loader.recognizer(for: "does-not-exist-\(UUID().uuidString)")
-	#expect(recognizer == nil)
-}
-
-// MARK: - PHEventRegistry
+// MARK: - Fake event source
 
 /// A no-op source that records its lifecycle and can be fired on demand.
 @MainActor
@@ -274,6 +25,70 @@ private final class FakeEventSource: PHEventSource {
 	func fire() { notify?() }
 }
 
+// MARK: - Event decoding
+
+@MainActor
+@Test func eventDecodesFromKnownStrings() throws {
+	let toml = """
+	[[block]]
+	command = "echo hi"
+	name = "a"
+	events = ["volume", "network", "appearance", "power", "mpd"]
+	"""
+
+	let blocks = try PHBlock.load(from: toml)
+
+	#expect(blocks[0].events == [PHEvent("volume"), PHEvent("network"), PHEvent("appearance"), PHEvent("power"), PHEvent("mpd")])
+}
+
+@MainActor
+@Test func eventAcceptsArbitraryStringAsCustom() throws {
+	// Unknown strings become custom event names resolved at runtime against
+	// `<config>/events/<name>/`.
+	let blocks = try PHBlock.load(from: """
+	[[block]]
+	command = "echo hi"
+	name = "b"
+	events = ["totally_made_up"]
+	""")
+
+	#expect(blocks[0].events == [PHEvent("totally_made_up")])
+}
+
+@MainActor
+@Test func eventsOptionalWhenOmitted() throws {
+	let blocks = try PHBlock.load(from: """
+	[[block]]
+	command = "echo hi"
+	name = "c"
+	""")
+
+	#expect(blocks[0].events == nil)
+}
+
+// MARK: - Event loader
+
+@MainActor
+@Test func defaultFactoryReturnsNilWithoutRecognizer() {
+	// No recognizer installed at a clean directory → factory yields nil.
+	let loader = PHEventLoader(directory: FileManager.default.temporaryDirectory)
+	let factory: @MainActor @Sendable (PHEvent) -> (any PHEventSource)? = { event in
+		guard let recognizer = loader.recognizer(for: event.rawValue) else { return nil }
+		return PHExternalEventSource(recognizer: recognizer)
+	}
+	#expect(factory(PHEvent("anything")) == nil)
+}
+
+@MainActor
+@Test func eventLoaderReturnsNilForMissingEvent() {
+	// A clean directory has no event folders, so every name fails to load.
+	let loader = PHEventLoader(directory: FileManager.default.temporaryDirectory)
+	let recognizer = loader.recognizer(for: "does-not-exist-\(UUID().uuidString)")
+	#expect(recognizer == nil)
+}
+
+// MARK: - Event registry
+
 @MainActor
 @Test func registryActivatesSourceLazilyAndRefcounts() async throws {
 	let fake = FakeEventSource()
@@ -334,7 +149,7 @@ private final class FakeEventSource: PHEventSource {
 	n.cancel()
 }
 
-// MARK: - PHBlock + Events
+// MARK: - Block + events
 
 @MainActor
 @Test func blockRefreshesOnEvent() async throws {
@@ -349,6 +164,7 @@ private final class FakeEventSource: PHEventSource {
 	let block = try PHBlock.load(from: """
 	[[block]]
 	command = "n=$(cat \(path) 2>/dev/null || echo 0); n=$((n+1)); echo $n > \(path); echo $n"
+	name = "d"
 	events = ["volume"]
 	""")[0]
 	block.registry = registry
@@ -385,6 +201,7 @@ private final class FakeEventSource: PHEventSource {
 	let block = try PHBlock.load(from: """
 	[[block]]
 	command = "n=$(cat \(path) 2>/dev/null || echo 0); n=$((n+1)); echo $n > \(path); echo $n"
+	name = "e"
 	refresh = 0.2
 	events = ["volume"]
 	""")[0]
@@ -406,30 +223,3 @@ private final class FakeEventSource: PHEventSource {
 
 	block.stopAutoRefresh()
 }
-
-// MARK: - PHController
-
-@MainActor
-@Test func controllerRefreshUpdatesAllBlocks() async throws {
-	let screen = try #require(NSScreen.main)
-	let blocks = try PHBlock.load(from: """
-	[[block]]
-	command = "printf a"
-
-	[[block]]
-	command = "printf b"
-	""")
-
-	let config = try PHConfig.load()
-	let theme = try PHTheme.load("voltage")
-	let controller = PHController(config: config, screen: screen, theme: theme, blocks: blocks)
-
-	controller.refresh()
-
-	// Allow the per-block update tasks to run.
-	try await Task.sleep(for: .milliseconds(100))
-
-	#expect(blocks[0].label == "a")
-	#expect(blocks[1].label == "b")
-}
-

Tests/phbarTests/PHPathsTests.swift

@@ -0,0 +1,58 @@
+import Foundation
+import Testing
+
+@testable import phbar
+
+// MARK: - Config directory cascade
+//
+// `PHPaths` resolves the config root in priority order:
+//   1. $XDG_CONFIG_HOME/phbar  (only for an absolute XDG path)
+//   2. ~/.config/phbar
+//   3. ~/.phbar
+
+@Test func pathsCandidatesIncludeAbsoluteXdgFirst() {
+	let home = FileManager.default.homeDirectoryForCurrentUser
+	let candidates = PHPaths.configDirectoryCandidates(environment: ["XDG_CONFIG_HOME": "/custom/xdg"])
+
+	#expect(candidates.count == 3)
+	#expect(candidates[0].path == "/custom/xdg/phbar")
+	#expect(candidates[1].path == home.appending(path: ".config/phbar").path)
+	#expect(candidates[2].path == home.appending(path: ".phbar").path)
+}
+
+@Test func pathsCandidatesOmitRelativeXdg() {
+	let home = FileManager.default.homeDirectoryForCurrentUser
+	let candidates = PHPaths.configDirectoryCandidates(environment: ["XDG_CONFIG_HOME": "relative/path"])
+
+	#expect(candidates.count == 2)
+	#expect(candidates[0].path == home.appending(path: ".config/phbar").path)
+	#expect(candidates[1].path == home.appending(path: ".phbar").path)
+}
+
+@Test func pathsCandidatesOmitEmptyXdg() {
+	let candidates = PHPaths.configDirectoryCandidates(environment: ["XDG_CONFIG_HOME": ""])
+	#expect(candidates.count == 2)
+}
+
+@Test func pathsCandidatesOmitXdgWhenUnset() {
+	let candidates = PHPaths.configDirectoryCandidates(environment: [:])
+	#expect(candidates.count == 2)
+}
+
+@Test func pathsResolvePicksFirstExistingCandidate() throws {
+	// An existing XDG-rooted dir takes priority over ~/.config/phbar because
+	// it sorts first in the candidate list.
+	let xdgRoot = FileManager.default.temporaryDirectory.appending(path: "phbar_xdg_\(UUID().uuidString)")
+	let xdgConfig = xdgRoot.appending(path: "phbar")
+	try FileManager.default.createDirectory(at: xdgConfig, withIntermediateDirectories: true)
+	defer { try? FileManager.default.removeItem(at: xdgRoot) }
+
+	let resolved = PHPaths.resolveConfigDirectory(environment: ["XDG_CONFIG_HOME": xdgRoot.path])
+
+	#expect(resolved == xdgConfig)
+}
+
+@Test func pathsConfigDirectoryMatchesResolve() {
+	// The cached static agrees with a fresh resolve against the live process env.
+	#expect(PHPaths.configDirectory == PHPaths.resolveConfigDirectory())
+}

Tests/phbarTests/PHThemeWindowTests.swift

@@ -0,0 +1,166 @@
+import AppKit
+import CoreGraphics
+import Foundation
+import Testing
+
+@testable import phbar
+
+// MARK: - PHThemeWindowDimension
+
+private struct DimensionWrapper: Decodable {
+	let v: PHThemeWindowDimension
+}
+
+@Test func dimensionDecodesPoints() throws {
+	let decoder = JSONDecoder()
+	#expect(try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":400}"#.utf8)).v == .points(400))
+	#expect(try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":400.5}"#.utf8)).v == .points(400.5))
+}
+
+@Test func dimensionDecodesPercentage() throws {
+	let decoder = JSONDecoder()
+	#expect(try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":"100%"}"#.utf8)).v == .percentage(1.0))
+	#expect(try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":"50%"}"#.utf8)).v == .percentage(0.5))
+}
+
+@Test func dimensionRejectsGarbage() {
+	let decoder = JSONDecoder()
+	#expect(throws: (any Error).self) {
+		try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":"wat"}"#.utf8))
+	}
+}
+
+@Test func dimensionResolvesAgainstLength() {
+	#expect(PHThemeWindowDimension.points(250).resolve(against: 1000) == 250)
+	#expect(PHThemeWindowDimension.percentage(0.25).resolve(against: 1000) == 250)
+}
+
+// MARK: - PHThemeWindowAnchor geometry
+
+@Test func anchorPlacesAtTopEdge() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 1000, height: 30)
+	let origin = PHThemeWindowAnchor.top.origin(in: screen, size: size)
+	#expect(origin == CGPoint(x: 0, y: 770))
+}
+
+@Test func anchorRespectsTopMargin() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 1000, height: 30)
+	let rect = PHThemeWindowMargin(top: 10).inset(of: screen)
+	let origin = PHThemeWindowAnchor.top.origin(in: rect, size: size)
+	#expect(origin == CGPoint(x: 0, y: 760))
+}
+
+@Test func anchorPlacesBottomLeadingCorner() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 200, height: 40)
+	let rect = PHThemeWindowMargin(bottom: 8, leading: 12).inset(of: screen)
+	let origin = PHThemeWindowAnchor.bottomLeading.origin(in: rect, size: size)
+	#expect(origin == CGPoint(x: 12, y: 8))
+}
+
+@Test func anchorTrailingCentersVertically() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 200, height: 40)
+	let rect = PHThemeWindowMargin(trailing: 20).inset(of: screen)
+	let origin = PHThemeWindowAnchor.trailing.origin(in: rect, size: size)
+	#expect(origin == CGPoint(x: 780, y: 380))
+}
+
+@Test func anchorCentersWithinContentRect() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 200, height: 40)
+	// `.center` centers within the inset rect: a top margin lifts the center,
+	// it doesn't ignore the margin.
+	let rect = PHThemeWindowMargin(top: 100).inset(of: screen)
+	let origin = PHThemeWindowAnchor.center.origin(in: rect, size: size)
+	// rect: y ∈ [0, 700], midY = 350 → 350 − 20 = 330
+	#expect(origin == CGPoint(x: 400, y: 330))
+}
+
+// MARK: - PHThemeWindowMargin.inset
+
+@Test func marginInsetAppliesAllEdges() {
+	let rect = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let inset = PHThemeWindowMargin(top: 10, bottom: 20, leading: 30, trailing: 40).inset(of: rect)
+	#expect(inset == CGRect(x: 30, y: 20, width: 930, height: 770))
+}
+
+@Test func marginInsetLeavesUnspecifiedEdgesUntouched() {
+	let rect = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	// Only leading set; top/bottom/trailing are left as-is (treated as 0).
+	let inset = PHThemeWindowMargin(leading: 50).inset(of: rect)
+	#expect(inset == CGRect(x: 50, y: 0, width: 950, height: 800))
+}
+
+// MARK: - BarWindow.computeFrame
+
+@MainActor
+@Test func computeFrameDefaultsToFullScreenTopBar() throws {
+	let screen = try #require(NSScreen.main)
+	// A window that omits geometry exercises computeFrame's defaults:
+	// width 100%, top anchor, no margin → a full-screen top bar. Built locally
+	// (rather than loading the bundled theme) so the test tracks the engine's
+	// defaults, not the theme file's editorial margins.
+	let theme = PHTheme(
+		windows: [PHThemeWindow(name: "default")],
+		texts: nil,
+		styles: nil
+	)
+	let config = PHConfig(theme: "default", window: "default", blocks: nil, env: nil, monitors: nil)
+	let blocks = try PHBlock.load(from: "[[block]]\nname = \"x\"\ncommand = \"echo x\"")
+	let controller = BarController(config: config, screen: screen, theme: theme, blocks: blocks, debug: false)
+
+	let frame = BarWindow.computeFrame(from: controller)
+
+	#expect(frame.width == screen.frame.width)
+	#expect(frame.minX == screen.frame.minX)
+	#expect(frame.minY == screen.frame.maxY - 30)
+}
+
+@MainActor
+@Test func computeFrameUsesAbsoluteOriginOverAnchor() throws {
+	let screen = try #require(NSScreen.main)
+	let theme = PHTheme(
+		windows: [PHThemeWindow(name: "abs", anchor: .bottom, origin: PHThemeWindowPoint(x: 100, y: 200))],
+		texts: nil,
+		styles: nil
+	)
+	let config = PHConfig(theme: "default", window: "abs", blocks: nil, env: nil, monitors: nil)
+	let blocks = try PHBlock.load(from: "[[block]]\nname = \"x\"\ncommand = \"echo x\"")
+	let controller = BarController(config: config, screen: screen, theme: theme, blocks: blocks, debug: false)
+
+	let frame = BarWindow.computeFrame(from: controller)
+
+	#expect(frame.origin == CGPoint(x: 100, y: 200))
+	#expect(frame.height == 30)
+}
+
+@MainActor
+@Test func computeFrameInsetsFullWidthBarByMargins() throws {
+	// Regression: `width = "100%"` previously ignored leading/trailing margins
+	// and spanned edge to edge. Margins now inset the content rectangle, so the
+	// bar spans only between them.
+	let screen = try #require(NSScreen.main)
+	let sf = screen.frame
+	let theme = PHTheme(
+		windows: [PHThemeWindow(
+			name: "inset",
+			width: .percentage(1.0),
+			anchor: .top,
+			margin: PHThemeWindowMargin(leading: 20, trailing: 20)
+		)],
+		texts: nil,
+		styles: nil
+	)
+	let config = PHConfig(theme: "default", window: "inset", blocks: nil, env: nil, monitors: nil)
+	let blocks = try PHBlock.load(from: "[[block]]\nname = \"x\"\ncommand = \"echo x\"")
+	let controller = BarController(config: config, screen: screen, theme: theme, blocks: blocks, debug: false)
+
+	let frame = BarWindow.computeFrame(from: controller)
+
+	#expect(frame.width == sf.width - 40)
+	#expect(frame.minX == sf.minX + 20)
+	#expect(frame.maxX == sf.maxX - 20)
+}