File::rename

- Added a rename method to permit safe file writes.

src/Path.cpp

@@ -32,6 +32,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <pwd.h>
+#include <stdio.h>
 #include <unistd.h>
 #include <Path.h>
 #include <cmake.h>
@@ -170,6 +171,22 @@ bool Path::executable () const
   return access (_data.c_str (), X_OK) ? false : true;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+bool Path::rename (const std::string& new_name)
+{
+  std::string expanded = expand (new_name);
+  if (_data != expanded)
+  {
+    if (::rename (_data.c_str (), expanded.c_str ()) == 0)
+    {
+      _data = expanded;
+      return true;
+    }
+  }
+
+  return false;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // ~      --> /home/user
 // ~foo/x --> /home/foo/s

src/Path.h

@@ -54,6 +54,7 @@ public:
   bool readable () const;
   bool writable () const;
   bool executable () const;
+  bool rename (const std::string&);
 
   // Statics
   static std::string expand (const std::string&);

test/file.t.cpp

@@ -34,7 +34,7 @@ Context context;
 
 int main (int argc, char** argv)
 {
-  UnitTest t (6);
+  UnitTest t (13);
 
   File::write ("/tmp/file.t.txt", "This is a test\n");
   File f6 ("/tmp/file.t.txt");
@@ -48,6 +48,23 @@ int main (int argc, char** argv)
   t.ok (File::create ("/tmp/file.t.create"), "File::create /tmp/file.t.create good");
   t.ok (File::remove ("/tmp/file.t.create"), "File::remove /tmp/file.t.create good");
 
+  // basename (std::string) const;
+  t.is (f6.name (), "file.t.txt", "File::basename /tmp/file.t.txt --> file.t.txt");
+
+  // dirname (std::string) const;
+  t.is (f6.parent (), "/tmp", "File::dirname /tmp/file.t.txt --> /tmp");
+
+  // bool rename (const std::string&);
+  File f7 ("/tmp/file.t.2.txt");
+  f7.append ("something\n");
+  f7.close ();
+
+  t.ok (f7.rename ("/tmp/file.t.3.txt"), "File::rename did not fail");
+  t.is (f7._data, "/tmp/file.t.3.txt",   "File::rename stored new name");
+  t.ok (f7.exists (),                    "File::rename new file exists");
+  t.ok (f7.remove (),                    "File::remove /tmp/file.t.3.txt good");
+  t.notok (f7.exists (),                 "File::remove new file no longer exists");
+
   return 0;
 }