From 3b56319cb635c71768106c01b04c5fd719b93242 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 3 Dec 2014 14:02:56 +0200
Subject: Initial build tool sketch (simulation)

To build:
g++-4.9 -std=c++11 -g -I.. -o bd bd.cxx
---
 build/bd.cxx | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 build/target | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 132 insertions(+)
 create mode 100644 build/bd.cxx
 create mode 100644 build/target

diff --git a/build/bd.cxx b/build/bd.cxx
new file mode 100644
index 0000000..918434a
--- /dev/null
+++ b/build/bd.cxx
@@ -0,0 +1,63 @@
+// file      : build/bd.cxx
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <vector>
+#include <iostream>
+
+#include <build/target>
+
+using namespace std;
+
+namespace build
+{
+  bool
+  update (target& t)
+  {
+    const targets& ps (t.prerequisites ());
+
+    for (target& p: ps)
+      if (!update (p))
+        return false;
+
+    //@@ TODO: check for existance, compare timestamps.
+
+    auto r (t.rule ());
+    return r != 0 ? r (t, t.prerequisites ()) : true;
+  }
+}
+
+using namespace build;
+
+bool
+cxx_compile_rule (target& t, const targets& p)
+{
+  //@@ TODO: actually execute
+
+  cerr << "c++ " << t.name () << endl;
+  return true;
+}
+
+bool
+cxx_link_rule (target& t, const targets& p)
+{
+  cerr << "ld " << t.name () << endl;
+  return true;
+}
+
+int
+main (int argc, char* argv[])
+{
+  exe bd ("bd");
+  obj bd_o ("bd.o");
+  bd.prerequisite (bd_o);
+  bd.rule (&cxx_link_rule);
+
+  cxx bd_cxx ("bd.cxx");
+  hxx target ("target");
+  bd_o.prerequisite (bd_cxx);
+  bd_o.prerequisite (target);
+  bd_o.rule (&cxx_compile_rule);
+
+  update (bd);
+}
diff --git a/build/target b/build/target
new file mode 100644
index 0000000..e6f05a5
--- /dev/null
+++ b/build/target
@@ -0,0 +1,69 @@
+// file      : build/target -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <string>
+#include <vector>
+#include <functional>
+
+namespace build
+{
+  class target;
+  typedef std::vector<std::reference_wrapper<target>> targets;
+
+  class target
+  {
+  public:
+    target (std::string n): name_ (n) {}
+
+    const std::string&
+    name () const {return name_;}
+
+    const targets&
+    prerequisites () const {return prerequisites_;}
+
+    targets&
+    prerequisites () {return prerequisites_;}
+
+    void
+    prerequisite (target& t) {prerequisites_.push_back (t);}
+
+  public:
+    typedef bool (*rule_type) (target&, const targets&);
+
+    rule_type
+    rule () const {return rule_;}
+
+    void
+    rule (rule_type r) {rule_ = r;}
+
+  private:
+    target (const target&) = delete;
+    target& operator= (const target&) = delete;
+
+  private:
+    std::string name_;
+    targets prerequisites_;
+    rule_type rule_ {0};
+  };
+
+  class exe: public target
+  {
+    using target::target;
+  };
+
+  class obj: public target
+  {
+    using target::target;
+  };
+
+  class hxx: public target
+  {
+    using target::target;
+  };
+
+  class cxx: public target
+  {
+    using target::target;
+  };
+}
-- 
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