Refactor + Bugs fixes on Strings + Gestion de la génération des images

Sources/Imagium/ImagiumError.swift

@@ -0,0 +1,43 @@
+//
+//  ImagiumError.swift
+//  
+//
+//  Created by Thibaut Schmitt on 24/01/2022.
+//
+
+import Foundation
+
+enum ImagiumError: Error {
+    case inputFolderNotFound(String)
+    case fileNotExists(String)
+    case unknownImageExtension(String)
+    case getFileAttributed(String, String)
+    case rsvgConvertNotFound
+    case writeFile(String, String)
+    case unknown(String)
+    
+    var localizedDescription: String {
+        switch self {
+        case .inputFolderNotFound(let inputFolder):
+            return " error:[\(Imagium.toolName)] Input folder not found: \(inputFolder)"
+            
+        case .fileNotExists(let filename):
+            return " error:[\(Imagium.toolName)] File \(filename) does not exists"
+            
+        case .unknownImageExtension(let filename):
+            return " error:[\(Imagium.toolName)] File \(filename) have an unhandled file extension. Cannot generate image."
+            
+        case .getFileAttributed(let filename, let errorDescription):
+            return " error:[\(Imagium.toolName)] Getting file attributes of \(filename) failed with error: \(errorDescription)"
+            
+        case .rsvgConvertNotFound:
+            return " error:[\(Imagium.toolName)] Can't find rsvg-convert (can be installed with 'brew remove imagemagick && brew install imagemagick --with-librsvg')"
+            
+        case .writeFile(let subErrorDescription, let filename):
+            return " error:[\(Imagium.toolName)] An error occured while writing content to \(filename): \(subErrorDescription)"
+            
+        case .unknown(let errorDescription):
+            return " error:[\(Imagium.toolName)] Unknown error: \(errorDescription)"
+        }
+    }
+}