From a94dcda7f00b10cb22b5f2138b1c29bcfbe7de37 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 24 Mar 2015 08:53:06 +0200
Subject: Make meta-operations control build loop; add disfigure skeleton

---
 build/file.cxx | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 build/file.cxx

(limited to 'build/file.cxx')

diff --git a/build/file.cxx b/build/file.cxx
new file mode 100644
index 0000000..7bb8bb6
--- /dev/null
+++ b/build/file.cxx
@@ -0,0 +1,68 @@
+// file      : build/file.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <build/file>
+
+#include <fstream>
+
+#include <build/scope>
+#include <build/parser>
+#include <build/filesystem>
+#include <build/diagnostics>
+
+using namespace std;
+
+namespace build
+{
+  void
+  source (const path& bf, scope& root, scope& base)
+  {
+    tracer trace ("source");
+
+    ifstream ifs (bf.string ());
+    if (!ifs.is_open ())
+      fail << "unable to open " << bf;
+
+    level4 ([&]{trace << "sourcing " << bf;});
+
+    ifs.exceptions (ifstream::failbit | ifstream::badbit);
+    parser p;
+
+    try
+    {
+      p.parse_buildfile (ifs, bf, root, base);
+    }
+    catch (const std::ios_base::failure&)
+    {
+      fail << "failed to read from " << bf;
+    }
+  }
+
+  void
+  source_once (const path& bf, scope& root, scope& base, scope& once)
+  {
+    tracer trace ("source_once");
+
+    if (!once.buildfiles.insert (bf).second)
+    {
+      level4 ([&]{trace << "skipping already sourced " << bf;});
+      return;
+    }
+
+    source (bf, root, base);
+  }
+
+  void
+  root_pre (scope& root)
+  {
+    tracer trace ("root_pre");
+
+    path bf (root.src_path () / path ("build/root.build"));
+
+    if (!file_exists (bf))
+      return;
+
+    source_once (bf, root, root);
+  }
+}
-- 
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