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

Sources/FontTool/FontToolError.swift

@@ -0,0 +1,27 @@
+//
+//  FontToolError.swift
+//  
+//
+//  Created by Thibaut Schmitt on 13/12/2021.
+//
+
+import Foundation
+
+enum FontToolError: Error {
+    case fcScan(String, Int32, String?)
+    case inputFolderNotFound(String)
+    case fileNotExists(String)
+    
+    var localizedDescription: String {
+        switch self {
+        case .fcScan(let path, let code, let output):
+            return "error:[FontTool] Error while getting fontName (fc-scan --format %{postscriptname} \(path). fc-scan exit with \(code) and output is: \(output ?? "no output")"
+            
+        case .inputFolderNotFound(let inputFolder):
+            return " error:[FontTool] Input folder not found: \(inputFolder)"
+            
+        case .fileNotExists(let filename):
+            return " error:[FontTool] File \(filename) does not exists"
+        }
+    }
+}