Merge master into lockfile

Sources/XcodeGenCLI/GenerationError.swift

@@ -0,0 +1,39 @@
+import PathKit
+import Foundation
+import ProjectSpec
+import SwiftCLI
+import Rainbow
+
+enum GenerationError: Error, CustomStringConvertible, ProcessError {
+    case missingProjectSpec(Path)
+    case projectSpecParsingError(Error)
+    case cacheGenerationError(Error)
+    case validationError(SpecValidationError)
+    case generationError(Error)
+    case writingError(Error)
+
+    var description: String {
+        switch self {
+        case .missingProjectSpec(let path):
+            return "No project spec found at \(path.absolute())"
+        case .projectSpecParsingError(let error):
+            return "Parsing project spec failed: \(error)"
+        case .cacheGenerationError(let error):
+            return "Couldn't generate cache file: \(error)"
+        case .validationError(let error):
+            return error.description
+        case .generationError(let error):
+            return String(describing: error)
+        case .writingError(let error):
+            return String(describing: error)
+        }
+    }
+
+    var message: String? {
+        return description.red
+    }
+
+    var exitStatus: Int32 {
+        return 1
+    }
+}