add Dsl and ConfigureDsl

lib/rscons/script.rb

@@ -1,13 +1,107 @@
 module Rscons
 
-  # The Script class encapsulates the state of a build script. It also provides
-  # the DSL for the build script to use.
+  # The Script class encapsulates the state of a build script.
   class Script
 
+    class Dsl
+      # Create a Dsl.
+      def initialize(script)
+        @script = script
+      end
+
+      # Set the project name.
+      def project_name(project_name)
+        @script.project_name = project_name
+      end
+
+      # Whether to automatically configure (default true).
+      def autoconf(autoconf)
+        @script.autoconf = autoconf
+      end
+
+      # Enter configuration block.
+      def configure(&block)
+        cdsl = ConfigureDsl.new(@script)
+        cdsl.instance_eval(&block)
+      end
+    end
+
+    class ConfigureDsl < Dsl
+      # Check for a C compiler.
+      def check_c_compiler(*c_compilers)
+        @script.check_c_compiler ||= []
+        @script.check_c_compiler += c_compilers
+      end
+
+      # Check for a C++ compiler.
+      def check_cxx_compiler(*cxx_compilers)
+        @script.check_cxx_compiler ||= []
+        @script.check_cxx_compiler += cxx_compilers
+      end
+
+      # Check for a D compiler.
+      def check_d_compiler(*d_compilers)
+        @script.check_d_compiler ||= []
+        @script.check_d_compiler += d_compilers
+      end
+
+      # Check for a C header.
+      def check_c_header(*c_headers)
+        @script.check_c_headers ||= []
+        @script.check_c_headers += c_headers
+      end
+
+      # Check for a C++ header.
+      def check_cxx_header(*cxx_headers)
+        @script.check_cxx_headers ||= []
+        @script.check_cxx_headers += cxx_headers
+      end
+
+      # Check for a D import.
+      def check_d_import(*d_imports)
+        @script.check_d_imports ||= []
+        @script.check_d_imports += d_imports
+      end
+
+      # Check for an executable.
+      def check_executable(*executables)
+        @script.check_executables ||= []
+        @script.check_executables += executables
+      end
+    end
+
     # @return [String, nil]
     #   Project name.
     attr_accessor :project_name
 
+    # @return [Array<String>]
+    #   C compilers to check for.
+    attr_accessor :check_c_compiler
+
+    # @return [Array<String>]
+    #   C++ compilers to check for.
+    attr_accessor :check_cxx_compiler
+
+    # @return [Array<String>]
+    #   D compilers to check for.
+    attr_accessor :check_d_compiler
+
+    # @return [Array<String>]
+    #   C headers to check for.
+    attr_accessor :check_c_headers
+
+    # @return [Array<String>]
+    #   C++ headers to check for.
+    attr_accessor :check_cxx_headers
+
+    # @return [Array<String>]
+    #   D imports to check for.
+    attr_accessor :check_d_imports
+
+    # @return [Array<String>]
+    #   Executables to check for.
+    attr_accessor :check_executables
+
     # @return [Boolean]
     #   Whether to autoconfigure if the user does not explicitly perform a
     #   configure operation before building (default: true).
@@ -15,7 +109,6 @@ module Rscons
 
     # Construct a Script.
     def initialize
-      @project_name = nil
       @autoconf = true
     end
 
@@ -27,7 +120,7 @@ module Rscons
     # @return [void]
     def load(path)
       script_contents = File.read(path, mode: "rb")
-      self.instance_eval(script_contents, path, 1)
+      Dsl.new(self).instance_eval(script_contents, path, 1)
     end
 
   end