Code Cleanup

- Cmake was not updating HAVE_ST_BIRTHTIME.
- NIBBLER_FEATURE_DATE was not properly applied everywhere.
- FEATURE_COLOR was not properly set.
- Some source files failed to include cmake.h, and therefore were not properly
- Removed inefficient use of std::string::substr for guaranteed single character
  strings.
- Integrated Directory::cd.
- Integrated File::ctime, ::btime.
- Integrated Path::operator+.
- Integrated Nibbler::getDigit{2,4,6}.
- Integrated HighResTimer.
  enabling/disabling code.
- All Path objects now expanded internally to absolute form.
- Modified unit tests to accomodate absolute paths.
- Merged new nibbler.t.cpp tests.
- Made various methods const.
- Includes removed from some files, added to others.

src/Path.cpp

@@ -33,6 +33,7 @@
 #include <pwd.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <limits.h>
 #include <Path.h>
 #include <cmake.h>
 
@@ -88,6 +89,13 @@ bool Path::operator== (const Path& other)
   return _data == other._data;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+Path& Path::operator+= (const std::string& dir)
+{
+  _data += "/" + dir;
+  return *this;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 Path::operator std::string () const
 {
@@ -153,7 +161,7 @@ bool Path::is_directory () const
 ////////////////////////////////////////////////////////////////////////////////
 bool Path::is_absolute () const
 {
-  if (_data.length () && _data.substr (0, 1) == "/")
+  if (_data.length () && _data[0] == '/')
     return true;
 
   return false;
@@ -197,6 +205,8 @@ bool Path::rename (const std::string& new_name)
 // ~      --> /home/user
 // ~foo/x --> /home/foo/s
 // ~/x    --> /home/foo/x
+// ./x    --> $PWD/x
+// x      --> $PWD/x
 std::string Path::expand (const std::string& in)
 {
   std::string copy = in;
@@ -234,6 +244,23 @@ std::string Path::expand (const std::string& in)
     }
   }
 
+  // Relative paths
+  else if (in.length () > 2 &&
+           in.substr (0, 2) == "./")
+  {
+    char buf[PATH_MAX];
+    getcwd (buf, PATH_MAX - 1);
+    copy = std::string (buf) + "/" + in.substr (2);
+  }
+  else if (in.length () > 1 &&
+           in[0] != '.' &&
+           in[0] != '/')
+  {
+    char buf[PATH_MAX];
+    getcwd (buf, PATH_MAX - 1);
+    copy = std::string (buf) + "/" + in;
+  }
+
   return copy;
 }