From d196845c85158de7b4ceb8e9417883fbd8e0fbdd Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sun, 4 Nov 2018 00:16:53 -0400
Subject: [PATCH] parse 'configure' command-line options

---
 lib/rscons/application.rb | 56 ++++++++++++++++++++++++++++++++++++---
 lib/rscons/cli.rb         | 29 ++++++++++++++++++--
 2 files changed, 80 insertions(+), 5 deletions(-)

diff --git a/lib/rscons/application.rb b/lib/rscons/application.rb
index 1ec38d4..63af893 100644
--- a/lib/rscons/application.rb
+++ b/lib/rscons/application.rb
@@ -15,23 +15,38 @@ module Rscons
     #   Access any variables set on the rscons command-line.
     attr_reader :vars
 
+    # @return [String]
+    #   Build directory (default "build").
+    attr_accessor :build_dir
+
+    # @return [String]
+    #   Installation prefix (default "/usr/local").
+    attr_accessor :prefix
+
     def initialize
-      @vars = VarSet.new
       @n_threads = determine_n_threads
+      @vars = VarSet.new
+      @build_dir = "build"
+      @prefix = "/usr/local"
+      @default_environment = Environment.new
     end
 
     # Run the specified operation.
     #
     # @param operation [String]
     #   The operation to perform (e.g. "clean", "configure", "build", etc...)
+    # @param script [Script]
+    #   The script.
     #
     # @return [Integer]
     #   Process exit code (0 on success).
-    def run(operation)
-      # TODO
+    def run(operation, script)
+      @script = script
       case operation
       when "clean"
         clean
+      when "configure"
+        configure
       end
       0
     end
@@ -57,6 +72,41 @@ module Rscons
       cache.clear
     end
 
+    # Configure the project.
+    #
+    # @return [void]
+    def configure
+      if ccc = @script.check_c_compiler
+        check_c_compiler(ccc)
+      end
+    end
+
+    # Configure: check for a working C compiler.
+    #
+    # @param ccc [Array<String>]
+    #   C compiler(s) to check for.
+    #
+    # @return [void]
+    def check_c_compiler(ccc)
+      if ccc.empty?
+        # Default C compiler search array.
+        ccc = %w[gcc clang]
+      end
+      cc = ccc.find do |cc|
+        test_c_compiler(cc)
+      end
+    end
+
+    # Test a C compiler.
+    #
+    # @param cc [String]
+    #   C compiler to test.
+    #
+    # @return [Boolean]
+    #   Whether the C compiler tested successfully.
+    def test_c_compiler(cc)
+    end
+
     # Determine the number of threads to use by default.
     #
     # @return [Integer]
diff --git a/lib/rscons/cli.rb b/lib/rscons/cli.rb
index cf1c8b5..2a45e1e 100644
--- a/lib/rscons/cli.rb
+++ b/lib/rscons/cli.rb
@@ -108,9 +108,34 @@ module Rscons
         if do_help
           puts USAGE
           exit 0
-        else
-          exit Rscons.application.run(operation)
         end
+
+        parse_operation_args(operation, argv)
+
+        exit Rscons.application.run(operation, script)
+      end
+
+      private
+
+      def parse_operation_args(operation, argv)
+        case operation
+        when "configure"
+          parse_configure_args(argv)
+        end
+      end
+
+      def parse_configure_args(argv)
+        OptionParser.new do |opts|
+          opts.banner = "Usage: #{$0} [options]"
+
+          opts.on("-b", "--build DIR") do |build_dir|
+            Rscons.application.build_dir = build_dir
+          end
+
+          opts.on("--prefix PREFIX") do |prefix|
+            Rscons.application.prefix = prefix
+          end
+        end.order!(argv)
       end
 
     end