Move source files to where SPM expectes them to be

Sources/Stencil/Environment.swift

@@ -0,0 +1,79 @@
+/// Container for environment data, such as registered extensions
+public struct Environment {
+  /// The class for loading new templates
+  public let templateClass: Template.Type
+  /// List of registered extensions
+  public var extensions: [Extension]
+  /// Mechanism for loading new files
+  public var loader: Loader?
+
+  /// Basic initializer
+  ///
+  /// - Parameters:
+  ///  - loader: Mechanism for loading new files
+  ///  - extensions: List of extension containers
+  ///  - templateClass: Class for newly loaded templates
+  public init(
+    loader: Loader? = nil,
+    extensions: [Extension] = [],
+    templateClass: Template.Type = Template.self
+  ) {
+    self.templateClass = templateClass
+    self.loader = loader
+    self.extensions = extensions + [DefaultExtension()]
+  }
+
+  /// Load a template with the given name
+  ///
+  /// - Parameters:
+  ///  - name: Name of the template
+  /// - returns: Loaded template instance
+  public func loadTemplate(name: String) throws -> Template {
+    if let loader = loader {
+      return try loader.loadTemplate(name: name, environment: self)
+    } else {
+      throw TemplateDoesNotExist(templateNames: [name], loader: nil)
+    }
+  }
+
+  /// Load a template with the given names
+  ///
+  /// - Parameters:
+  ///  - names: Names of the template
+  /// - returns: Loaded template instance
+  public func loadTemplate(names: [String]) throws -> Template {
+    if let loader = loader {
+      return try loader.loadTemplate(names: names, environment: self)
+    } else {
+      throw TemplateDoesNotExist(templateNames: names, loader: nil)
+    }
+  }
+
+  /// Render a template with the given name, providing some data
+  ///
+  /// - Parameters:
+  ///  - name: Name of the template
+  ///  - context: Data for rendering
+  /// - returns: Rendered output
+  public func renderTemplate(name: String, context: [String: Any] = [:]) throws -> String {
+    let template = try loadTemplate(name: name)
+    return try render(template: template, context: context)
+  }
+
+  /// Render the given template string, providing some data
+  ///
+  /// - Parameters:
+  ///  - string: Template string
+  ///  - context: Data for rendering
+  /// - returns: Rendered output
+  public func renderTemplate(string: String, context: [String: Any] = [:]) throws -> String {
+    let template = templateClass.init(templateString: string, environment: self)
+    return try render(template: template, context: context)
+  }
+
+  func render(template: Template, context: [String: Any]) throws -> String {
+    // update template environment as it can be created from string literal with default environment
+    template.environment = self
+    return try template.render(context)
+  }
+}