From ce8a94e6a76097ef7eeb34df4257991a20599712 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 14 Jan 2015 11:39:21 +0200
Subject: Track file extension in target, prerequisite

---
 build/path.txx | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'build/path.txx')

diff --git a/build/path.txx b/build/path.txx
index 3e952d8..f576870 100644
--- a/build/path.txx
+++ b/build/path.txx
@@ -62,6 +62,34 @@ namespace build
       return *this;
   }
 
+  template <typename C>
+  const C* basic_path<C>::
+  extension () const
+  {
+    size_type i (path_.size ());
+
+    for (; i > 0; --i)
+    {
+      if (path_[i - 1] == '.')
+        break;
+
+      if (traits::is_separator (path_[i - 1]))
+      {
+        i = 0;
+        break;
+      }
+    }
+
+    // Weed out paths like ".txt" and "/.txt"
+    //
+    if (i > 1 && !traits::is_separator (path_[i - 2]))
+    {
+      return path_.c_str () + i;
+    }
+    else
+      return nullptr;
+  }
+
 #ifdef _WIN32
   template <typename C>
   typename basic_path<C>::string_type basic_path<C>::
-- 
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