improve error messages

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

@@ -10,7 +10,7 @@ extension PHBarDelegate {
 		do {
 			controller = try factory.make(for: screen)
 		} catch {
-			stderr("skipping screen \(screen.localizedName): \(error)")
+			stderr("skipping screen \(screen.localizedName): \(error.localizedDescription)")
 			return false
 		}
 		let window = BarWindow(controller: controller)

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

@@ -3,39 +3,34 @@ import TOML
 
 extension PHConfig {
 	/// Load configuration from the resolved config directory
-	/// (see `PHPaths`). If the file doesn't exist or fails to parse, the
-	/// bundled default is used.
+	/// (see `PHPaths`). If the file doesn't exist or fails to parse,
+	/// the execution is interrupted.
 	static func load() throws -> PHConfig {
 		let url = PHPaths.configDirectory.appending(path: "config.toml")
 
 		if FileManager.default.fileExists(atPath: url.relativePath) {
 			return try load(from: url)
 		} else {
-			return try loadFromBundle()
-		}
-	}
+			throw PHBar.Error(
+				"""
+				Configuration file not found.
+				       Make sure to have a file named `config.toml` inside the
+				       directory: `\(url.deletingLastPathComponent().relativePath)`
 
-	/// 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")
+				Tip: If you've never used phbar before, run the `phbar install` command
+				     to automatically generate the required configuration files.
+				"""
+			)
 		}
-		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)
+			let contents = String(data: data, encoding: .utf8), !contents.isEmpty
 		else {
-			throw PHBar.Error("Failed to load config file")
+			throw PHBar.Error("Configuration file not readable or empty.")
 		}
 
 		return try load(from: contents)
@@ -53,7 +48,7 @@ extension PHConfig {
 			// resolve the same set.
 			return config.resolvingEnv()
 		} catch {
-			throw PHBar.Error("Failed to parse config file", underlyingError: error)
+			throw PHBar.Error("Configuration file not valid", underlyingError: error)
 		}
 	}
 }