Fix buffer stomping; retool Makefile.

The Makefile is now useful for building ke(1) to aid in more rapid
development. This works because ke doesn't (yet) need any special
non-system libraries.

Buffer.h

@@ -35,28 +35,38 @@ public:
 	enum class FileStatus : uint8_t {
 		/// The file operation succeeded correctly.
 		FileStatusOK = 0,
+		
+		/// There was an error, but it wasn't handled correctly.
+		/// This is mostly for debugging purposes, and shouldn't
+		/// be seen by users.
+		///
+		/// \detail This is set at the beginning of failable
+		///         operations, and indicates that the right
+		///	    status wasn't set correctly.
+		FileStatusUnspecifiedError = 1,
 
 		/// The file can't be written to because it is marked
 		/// read-only. This refers to a buffer being marked as
 		/// read-only, not to whether the underlying file is
 		/// actually read-only.
-		FileStatusReadOnly = 1,
+		FileStatusReadOnly = 2,
 
 		/// There was an I/O error trying to write to the file.
-		FileStatusIOFailed = 2,
+		FileStatusIOFailed = 3,
 
 		/// The Buffer couldn't be flushed because it is a virtual
 		/// buffer. If the user explicitly tried to save the buffer,
 		/// they should be prompted for a path.
-		FileStatusVirtual = 3,
+		FileStatusVirtual = 4,
 
 		/// The underlying file doesn't have the right permissions;
 		/// for example, it's not writeable if the user is trying to
 		/// write the file.
-		FileStatusInvalidPermissions = 4,
+		FileStatusInvalidPermissions = 5,
 
 		/// The underlying file doesn't exist.
-		FileStatusNonExistent = 5,
+		FileStatusNonExistent = 6,
+		
 	};
 
 	static std::string FileStatusToString(FileStatus status);
@@ -100,7 +110,7 @@ public:
 
 	void ChangePath(std::string newPath);
 
-	Cursor Cursor()
+	Cursor Where()
 	{ return this->cursor; }
 
 	void MarkDirty();
@@ -109,16 +119,25 @@ public:
 
 	size_t Size();
 
+	/// Does this buffer have a current, on-disk file?
+	///
+	/// \return True if this is a file buffer with an extant source
+	///         file.
+	bool			Exists();
+
+	/// PrintBufferStatus is a debug tool to capture the current
+	/// buffer state.
+	void			PrintBufferStatus(std::ostream &os);
 private:
 	void clearContents();
 
-	class Cursor cursor;
-
-	bool           dirty;
-	std::string    name;
-	OptString      path;
-	OptFile        file;
-	BufferContents contents;
+	Cursor		cursor;
+	bool		dirty;
+	std::string	name;
+	OptString	path;
+	OptFile		file;
+	BufferContents	contents;
+	FileStatus	status;
 };