Implement complete root/base detection, basic module support

This is the initial groundwork for the configuration support.

1 files changed, 43 insertions, 0 deletions

diff --git a/build/config/module.cxx b/build/config/module.cxx
new file mode 100644
index 0000000..bbaccdc
--- /dev/null
+++ b/build/config/module.cxx
@@ -0,0 +1,43 @@
+// file      : build/config/module.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <build/config/module>
+
+#include <build/path>
+#include <build/scope>
+#include <build/diagnostics>
+
+using namespace std;
+
+namespace build
+{
+  namespace config
+  {
+    static bool
+    trigger (scope&, const path& p)
+    {
+      tracer trace ("config::trigger");
+
+      level4 ([&]{trace << "intercepted sourcing of " << p;});
+      return false;
+    }
+
+    void
+    load (scope& root, scope& base, const location& l)
+    {
+      tracer trace ("config::load");
+
+      if (&root != &base)
+        fail (l) << "config module must be loaded in project root scope";
+
+      //@@ TODO: avoid multiple loads (generally, for modules).
+      //
+      level4 ([&]{trace << "for " << root.path () << '/';});
+
+      // Register the build/config.build loading trigger.
+      //
+      root.triggers[path ("build/config.build")] = &trigger;
+    }
+  }
+}