From 5409489c632fcaa3868a0767cecef65f079e5a94 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 19 Sep 2009 08:41:33 +0200
Subject: Add RAII-based file auto-remover

---
 cutl/fs/auto-remove.cxx | 39 ++++++++++++++++++++++++
 cutl/fs/auto-remove.hxx | 81 +++++++++++++++++++++++++++++++++++++++++++++++++
 cutl/fs/exception.cxx   | 18 +++++++++++
 cutl/fs/exception.hxx   | 36 ++++++++++++++++++++++
 cutl/makefile           |  2 +-
 5 files changed, 175 insertions(+), 1 deletion(-)
 create mode 100644 cutl/fs/auto-remove.cxx
 create mode 100644 cutl/fs/auto-remove.hxx
 create mode 100644 cutl/fs/exception.cxx
 create mode 100644 cutl/fs/exception.hxx

diff --git a/cutl/fs/auto-remove.cxx b/cutl/fs/auto-remove.cxx
new file mode 100644
index 0000000..08718e9
--- /dev/null
+++ b/cutl/fs/auto-remove.cxx
@@ -0,0 +1,39 @@
+// file      : cutl/fs/auto-remove.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <cstdio> // std::remove
+#include <cerrno>
+
+#include <cutl/fs/exception.hxx>
+#include <cutl/fs/auto-remove.hxx>
+
+namespace cutl
+{
+  namespace fs
+  {
+    auto_remove::
+    ~auto_remove ()
+    {
+      if (!canceled_)
+      {
+        if (std::remove (path_.string ().c_str ()) == -1)
+          throw error (errno);
+      }
+    }
+
+    auto_removes::
+    ~auto_removes ()
+    {
+      if (!canceled_)
+      {
+        for (paths::iterator i (paths_.begin ()); i != paths_.end (); ++i)
+        {
+          if (std::remove (i->string ().c_str ()) == -1)
+            throw error (errno);
+        }
+      }
+    }
+  }
+}
diff --git a/cutl/fs/auto-remove.hxx b/cutl/fs/auto-remove.hxx
new file mode 100644
index 0000000..0ca7f8f
--- /dev/null
+++ b/cutl/fs/auto-remove.hxx
@@ -0,0 +1,81 @@
+// file      : cutl/fs/auto-remove.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_FS_AUTO_REMOVE_HXX
+#define CUTL_FS_AUTO_REMOVE_HXX
+
+#include <vector>
+
+#include <cutl/exception.hxx>
+#include <cutl/fs/path.hxx>
+
+namespace cutl
+{
+  namespace fs
+  {
+    // Remove a file or an empty directory on destruction unless canceled.
+    //
+    struct auto_remove
+    {
+      explicit
+      auto_remove (path const& p)
+          : path_ (p), canceled_ (false)
+      {
+      }
+
+      ~auto_remove ();
+
+      void
+      cancel ()
+      {
+        canceled_ = true;
+      }
+
+    private:
+      auto_remove (auto_remove const&);
+
+      auto_remove&
+      operator= (auto_remove const&);
+
+    private:
+      path path_;
+      bool canceled_;
+    };
+
+    // Remove a list of file or aempty directories on destruction unless
+    // canceled.
+    //
+    struct auto_removes
+    {
+      ~auto_removes ();
+
+      void
+      add (path const& p)
+      {
+        paths_.push_back (p);
+      }
+
+      void
+      cancel ()
+      {
+        canceled_ = true;
+      }
+
+    private:
+      auto_removes (auto_removes const&);
+
+      auto_removes&
+      operator= (auto_removes const&);
+
+    private:
+      typedef std::vector<path> paths;
+
+      paths paths_;
+      bool canceled_;
+    };
+  }
+}
+
+#endif // CUTL_FS_AUTO_REMOVE_HXX
diff --git a/cutl/fs/exception.cxx b/cutl/fs/exception.cxx
new file mode 100644
index 0000000..793902d
--- /dev/null
+++ b/cutl/fs/exception.cxx
@@ -0,0 +1,18 @@
+// file      : cutl/fs/exception.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <cutl/fs/exception.hxx>
+
+namespace cutl
+{
+  namespace fs
+  {
+    char const* error::
+    what () const throw ()
+    {
+      return "filesystem error";
+    }
+  }
+}
diff --git a/cutl/fs/exception.hxx b/cutl/fs/exception.hxx
new file mode 100644
index 0000000..b412491
--- /dev/null
+++ b/cutl/fs/exception.hxx
@@ -0,0 +1,36 @@
+// file      : cutl/fs/exception.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_FS_EXCEPTION_HXX
+#define CUTL_FS_EXCEPTION_HXX
+
+#include <cutl/exception.hxx>
+
+namespace cutl
+{
+  namespace fs
+  {
+    struct error: exception
+    {
+      error (int code): code_ (code) {}
+
+      // Error code (errno).
+      //
+      int
+      code () const
+      {
+        return code_;
+      }
+
+      virtual char const*
+      what () const throw ();
+
+    private:
+      int code_;
+    };
+  }
+}
+
+#endif // CUTL_FS_EXCEPTION_HXX
diff --git a/cutl/makefile b/cutl/makefile
index 294bbd5..1635311 100644
--- a/cutl/makefile
+++ b/cutl/makefile
@@ -7,7 +7,7 @@ include $(dir $(lastword $(MAKEFILE_LIST)))../build/bootstrap.make
 
 cxx_tun   := exception.cxx shared-ptr/base.cxx
 
-cxx_tun   += fs/path.cxx
+cxx_tun   += fs/exception.cxx fs/path.cxx fs/auto-remove.cxx
 
 cxx_tun   +=              \
 compiler/context.cxx      \
-- 
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