Bridge: Fixed File "duplicate definitions" when using SD and Bridge libraries together

The two File classes have been enclosed into different namespaces.

To guarantee compatibility with old sketches that uses only one of the two
libraries an additional line:

   using namespace xxxxx;

has been added so the users can still use "File" where there is no ambiguity.

BridgeLib::File and SDLib::File classes have been also aliased to BridgeFile
and SDFile respectively, users are encouraged to use that instead of File.

Author: cmaglie

keywords.txt

@@ -8,6 +8,7 @@
 
 SD	KEYWORD1	SD
 File	KEYWORD1	SD
+SDFile	KEYWORD1	SD
 
 #######################################
 # Methods and Functions (KEYWORD2)

src/SD.cpp

@@ -52,6 +52,8 @@
 
 #include "SD.h"
 
+namespace SDLib {
+
 // Used by `getNextPathComponent`
 #define MAX_COMPONENT_LEN 12 // What is max length?
 #define PATH_COMPONENT_BUFFER_LEN MAX_COMPONENT_LEN+1
@@ -614,3 +616,5 @@ void File::rewindDirectory(void) {
 }
 
 SDClass SD;
+
+};

src/SD.h

@@ -23,6 +23,8 @@
 #define FILE_READ O_READ
 #define FILE_WRITE (O_READ | O_WRITE | O_CREAT)
 
+namespace SDLib {
+
 class File : public Stream {
  private:
   char _name[13]; // our name
@@ -104,4 +106,18 @@ class SDClass {
 
 extern SDClass SD;
 
+};
+
+// We enclose File and SD classes in namespace SDLib to avoid conflicts
+// with others legacy libraries that redefines File class.
+
+// This ensure compatibility with sketches that uses only SD library
+using namespace SDLib;
+
+// This allows sketches to use SDLib::File with other libraries (in the
+// sketch you must use SDFile instead of File to disambiguate)
+typedef SDLib::File    SDFile;
+typedef SDLib::SDClass SDFileSystemClass;
+#define SDFileSystem   SDLib::SD
+
 #endif