Add stencil on color

Sources/ResgenSwift/Colors/Generator/ColorExtensionGenerator.swift

@@ -41,12 +41,28 @@ struct ColorExtensionGenerator {
                                     staticVar: Bool,
                                     extensionName: String,
                                     isSwiftUI: Bool) -> String {
-        [
-            Self.getHeader(extensionClassname: extensionName, isSwiftUI: isSwiftUI),
-            Self.getProperties(for: colors, withStaticVar: staticVar, isSwiftUI: isSwiftUI),
-            Self.getFooter()
-        ]
-            .joined(separator: "\n")
+//        [
+//            Self.getHeader(extensionClassname: extensionName, isSwiftUI: isSwiftUI),
+//            Self.getProperties(for: colors, withStaticVar: staticVar, isSwiftUI: isSwiftUI),
+//            Self.getFooter()
+//        ]
+//            .joined(separator: "\n")
+        do {
+            let context: [String: Any] = [
+                "colors": colors,
+                "isStatic": staticVar,
+                "isSwiftUI": isSwiftUI,
+                "toolName": Colors.toolName,
+                "resgenVersion": ResgenSwiftVersion,
+                "extensionClassname": extensionName
+            ]
+            
+            return try ResgenSwift.environment.renderTemplate(name: "Colors/main_template", context: context)
+        } catch {
+//            let error = ColorsToolError.writeExtension(extensionFilePath, error.localizedDescription)
+//            print(error.description)
+            Colors.exit(withError: error)
+        }
     }
     
     private static func getHeader(extensionClassname: String, isSwiftUI: Bool) -> String {

Sources/ResgenSwift/main.swift

@@ -8,6 +8,8 @@
 import ToolCore
 import Foundation
 import ArgumentParser
+import Stencil
+import PathKit
 
 struct ResgenSwift: ParsableCommand {
     
@@ -32,6 +34,20 @@ struct ResgenSwift: ParsableCommand {
         // subcommand is not given on the command line.
         //defaultSubcommand: Twine.self
     )
+    
+    static let projectDirectory = URL(fileURLWithPath: #file)   // ProjectDir/Sources/ResgenSwift/main.swift
+        .deletingLastPathComponent()                            // ProjectDir/Sources/ResgenSwift/
+        .deletingLastPathComponent()                            // ProjectDir/Sources/
+        .deletingLastPathComponent()                            // ProjectDir/
+    
+    static let environment = Environment(
+        loader: FileSystemLoader(
+            paths: [
+                Path("\(projectDirectory.path)/Templates/")
+            ]
+        )
+    )
 }
 
+print(ResgenSwift.projectDirectory.path)
 ResgenSwift.main()