Handle shell startup output in installed package JSON

Sources/BrewRepositories/BrewInstalledPackagesRepository.swift

@@ -224,17 +224,24 @@ public final class BrewInstalledPackagesRepository: InstalledPackagesRepository
     }
 
     private func decodeInfoJSON(from standardOutput: String) throws -> BrewInfoJSON {
-        let data = Data(standardOutput.utf8)
-        do {
-            return try JSONDecoder().decode(BrewInfoJSON.self, from: data)
-        } catch {
-            throw BrewCommandError.launchFailed(
-                underlying: String(
-                    localized: "Failed to decode Homebrew JSON output.",
-                    comment: "Installed tab JSON decode failure",
-                ),
-            )
+        let decoder = JSONDecoder()
+        if let payload = try? decoder.decode(BrewInfoJSON.self, from: Data(standardOutput.utf8)) {
+            return payload
+        }
+
+        for jsonStart in standardOutput.indices where standardOutput[jsonStart] == "{" {
+            let jsonOutput = standardOutput[jsonStart...]
+            if let payload = try? decoder.decode(BrewInfoJSON.self, from: Data(jsonOutput.utf8)) {
+                return payload
+            }
         }
+
+        throw BrewCommandError.launchFailed(
+            underlying: String(
+                localized: "Failed to decode Homebrew JSON output.",
+                comment: "Installed tab JSON decode failure",
+            ),
+        )
     }
 }
 

Tests/BrewRepositoriesTests/BrewInstalledPackagesRepositoryTests.swift

@@ -13,6 +13,27 @@ import Foundation
 import Testing
 
 struct BrewInstalledPackagesRepositoryTests {
+    @Test @MainActor func `load ignores interactive shell output before installed info json`() async {
+        let runner = MockBrewCommandRunner(
+            responses: InstalledPackagesTestSupport.installedInfoJSONResponse(
+                standardOutput: """
+                \u{1B}]1337;SetUserVar=badge={"theme":"dark"}\u{7}
+                {
+                  "formulae": [
+                    { "name": "wget", "versions": { "stable": "1.0.0" }, "installed": [{ "version": "1.0.0" }] }
+                  ],
+                  "casks": []
+                }
+                """,
+            ),
+        )
+        let repo = InstalledPackagesTestSupport.repository(commandRunner: runner)
+
+        let packages = await InstalledPackagesTestSupport.loadedPackages(from: repo)
+
+        #expect(packages.map(\.name) == ["wget"])
+    }
+
     @Test @MainActor func `load returns sorted packages for mixed formula and cask json payload`() async throws {
         let json = """
         {