From 9fb791e9fad6c63fc1dac49f4d05ae63b8a3db9b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 5 Jan 2016 11:55:15 +0200
Subject: Rename build directory/namespace to build2

---
 build2/target.txx | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 build2/target.txx

(limited to 'build2/target.txx')

diff --git a/build2/target.txx b/build2/target.txx
new file mode 100644
index 0000000..3209720
--- /dev/null
+++ b/build2/target.txx
@@ -0,0 +1,58 @@
+// file      : build2/target.txx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <build2/scope>
+#include <build2/context>     // extension_pool
+#include <build2/diagnostics>
+#include <build2/prerequisite>
+
+namespace build2
+{
+  template <const char* ext>
+  const string&
+  target_extension_fix (const target_key&, scope&)
+  {
+    return extension_pool.find (ext);
+  }
+
+  template <const char* var, const char* def>
+  const string&
+  target_extension_var (const target_key& tk, scope& s)
+  {
+    // Include target type/pattern-specific variables.
+    //
+    if (auto l = s.lookup (tk, var))
+    {
+      // Help the user here and strip leading '.' from the extension.
+      //
+      const string& e (as<string> (*l));
+      return extension_pool.find (
+        !e.empty () && e.front () == '.' ? string (e, 1) : e);
+    }
+
+    if (def != nullptr)
+      return extension_pool.find (def);
+
+    {
+      diag_record dr;
+      dr << error << "no default extension in variable '" << var << "'"
+         << info << "required to derive file name for ";
+
+      // This is a bit hacky: we may be dealing with a target (see
+      // file::derive_path()) or prerequsite (see search_existing_file()).
+      // So we are going to check if dir is absolute. If it is, then
+      // we assume this is a target, otherwise -- prerequsite.
+      //
+      if (tk.dir->absolute ())
+        dr << "target " << tk;
+      else
+        dr << "prerequisite " << prerequisite_key {nullptr, tk, &s};
+
+      dr << info << "perhaps you forgot to add "
+         << tk.type->name << "{*}: " << var << " = ...";
+    }
+
+    throw failed ();
+  }
+}
-- 
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