From bd1e2ab33250588b33038ab0e9a57437ed1d6e98 Mon Sep 17 00:00:00 2001
From: Federico Fissore <f.fissore@arduino.cc>
Date: Thu, 11 Jul 2013 18:14:49 +0200
Subject: [PATCH] File: implemented File.openNextFile() and
 File.rewindDirectory()

---
 libraries/Bridge/FileIO.cpp | 42 ++++++++++++++++++++++++++++++++++---
 libraries/Bridge/FileIO.h   |  3 +++
 2 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/libraries/Bridge/FileIO.cpp b/libraries/Bridge/FileIO.cpp
index 4339c8e..83c889e 100644
--- a/libraries/Bridge/FileIO.cpp
+++ b/libraries/Bridge/FileIO.cpp
@@ -18,6 +18,8 @@
 
 #include <FileIO.h>
 
+
+
 File::File(BridgeClass &b) : mode(255), bridge(b) {
   // Empty
 }
@@ -27,6 +29,7 @@ File::File(const char *_filename, uint8_t _mode, BridgeClass &b) : mode(_mode),
   char modes[] = {'r','w','a'};
   uint8_t cmd[] = {'F', modes[mode]};
   uint8_t res[2];
+  dirPosition = 1;
   bridge.transfer(cmd, 2, (uint8_t*)filename.c_str(), filename.length(), res, 2);
   if (res[0] != 0) { // res[0] contains error code
     mode = 255; // In case of error keep the file closed
@@ -161,9 +164,42 @@ boolean File::isDirectory() {
   bridge.transfer(cmd, 1, (uint8_t *)filename.c_str(), filename.length(), res, 1);
   return res[0];
 }
-//boolean isDirectory(void)
-//File openNextFile(uint8_t mode = O_RDONLY);
-//void rewindDirectory(void)
+
+
+File File::openNextFile(uint8_t mode){
+  Process awk;
+  char tmp;
+  String command;
+  String filepath;
+  if (dirPosition == 0xFFFF) return File();
+
+  command = "ls ";
+  command += filename;
+  command += " | awk 'NR==";
+  command += dirPosition;
+  command += "'";
+  
+  awk.runShellCommand(command);
+
+  while(awk.running()); 
+
+  command = "";
+
+  while (awk.available()){
+    tmp = awk.read();
+    if (tmp!='\n') command += tmp;
+  }
+  if (command.length() == 0)
+    return File();
+  dirPosition++;
+  filepath = filename + "/" + command;
+  return File(filepath.c_str(),mode);
+  
+} 
+
+void File::rewindDirectory(void){
+  dirPosition = 1;
+}
 
 
 
diff --git a/libraries/Bridge/FileIO.h b/libraries/Bridge/FileIO.h
index 0105255..0807287 100644
--- a/libraries/Bridge/FileIO.h
+++ b/libraries/Bridge/FileIO.h
@@ -55,14 +55,17 @@ private:
   void doBuffer();
   uint8_t buffered;
   uint8_t readPos;
+  uint16_t dirPosition;
   static const int BUFFER_SIZE = 64;
   uint8_t buffer[BUFFER_SIZE];
   
+  
 private:
   BridgeClass &bridge;
   String filename;
   uint8_t mode;
   uint8_t handle;
+  
 };
 
 class FileSystemClass {