Add support to catch SD File list

Due to memory constraint limit to 70 entries of 30 char max =~2K
also add a time out if cannot catch end of list within 30s
/SDFILES is a JSON file with the list - UI not defined yet

README.md

@@ -66,7 +66,7 @@ Home page :
 <img src=https://raw.githubusercontent.com/luc-github/ESP8266/master/Page1.png><br>
 System Configuration Page:     
 <img src=https://raw.githubusercontent.com/luc-github/ESP8266/master/Page2.png><br>     
-Access Point Configuation Page:    
+Access Point Configuration Page:    
 <img src=https://raw.githubusercontent.com/luc-github/ESP8266/master/Page3.png><br>     
 Client Configuration Page:     
 <img src=https://raw.githubusercontent.com/luc-github/ESP8266/master/Page4.png><br>     

esp8266/command.cpp

@@ -66,8 +66,18 @@ void COMMAND::execute_command(int cmd,String cmd_params)
 void COMMAND::check_command(String buffer)
 {
 	String ESP_Command;
-	//look for ESP command
+	static bool bfileslist=false;
-	//is there a first part ?
+	static uint32_t start_list=0;
+	if (!bfileslist) 
+	{
+		int filesstart = buffer.indexOf("Begin file list");
+		if (filesstart>-1)
+			{ 
+				Serial.print("Starting");
+				start_list=system_get_time();
+				bfileslist=true;
+				web_interface->fileslist.clear();
+			}
 		int ESPpos = buffer.indexOf("[ESP");
 		int Tpos = buffer.indexOf("T:");
 		int Xpos = buffer.indexOf("X:");
@@ -121,6 +131,29 @@ void COMMAND::check_command(String buffer)
 		//Status
 		if (Statuspos>-1)(web_interface->status_msg).add(buffer.substring(Statuspos+7).c_str());
 		}
+	else
+		{
+			if ((system_get_time()-start_list)>30000000) //timeout in case of problem
+			{
+				bfileslist=false;
+				Serial.print("time out");
+			}
+			else
+			{
+				if (buffer.indexOf("End file list")>-1)
+				{
+					Serial.print("Ending");
+					bfileslist=false;
+				}
+				else 
+				{
+					Serial.print(buffer);
+					web_interface->fileslist.add(buffer); 
+				}
+			}
+			
+		}
+}
 
 //read a buffer in an array
 void COMMAND::read_buffer_serial(uint8_t *b, size_t len)

esp8266/webinterface.cpp

@@ -2400,6 +2400,20 @@ void handleFileList() {
 	web_interface->WebServer.send(200, "application/json", jsonfile);
 }
 
+void handleSDFileList() {
+	String jsonfile = "[";
+	for (int i=0;i<web_interface->fileslist.size();i++)
+	{
+		if (i>0)jsonfile+=",";
+		jsonfile+="{\"entry\":\"";
+		jsonfile+=web_interface->fileslist.get(i);
+		jsonfile+="\"}";
+	}
+	jsonfile+="]";
+	web_interface->WebServer.send(200, "application/json", jsonfile);
+}
+
+
 //do a redirect to avoid to many query
 //and handle not registred path
 void handle_not_found()
@@ -2627,6 +2641,7 @@ WEBINTERFACE_CLASS::WEBINTERFACE_CLASS (int port):WebServer(port)
 	WebServer.on("/CMD",HTTP_ANY, handle_web_command);
 	WebServer.on("/RESTART",HTTP_GET, handle_restart);
 	WebServer.on("/FILES", HTTP_ANY, handleFileList);
+	WebServer.on("/SDFILES", HTTP_ANY, handleSDFileList);
 	WebServer.onFileUpload(handleFileUpload);
 	//Captive portal Feature
 	#ifdef CAPTIVE_PORTAL_FEATURE
@@ -2643,13 +2658,15 @@ WEBINTERFACE_CLASS::WEBINTERFACE_CLASS (int port):WebServer(port)
 	answer4M221="100";
 	last_temp=system_get_time();
 	restartmodule=false;
-	//rolling list of 5 entries with a maximum of 50 char for each entry
+	//rolling list of 4entries with a maximum of 50 char for each entry
 	error_msg.setsize(4);
 	error_msg.setlenght(50);
 	info_msg.setsize(4);
 	info_msg.setlenght(50);
 	status_msg.setsize(4);
 	status_msg.setlenght(50);
+	fileslist.setlenght(30);//12 for filename + space + size
+	fileslist.setsize(70); // 70 files to limite to 2K
 	fsUploadFile=(fs::File)0;
 }
 //Destructor
@@ -2658,6 +2675,7 @@ WEBINTERFACE_CLASS::~WEBINTERFACE_CLASS()
 	info_msg.clear();
 	error_msg.clear();
 	status_msg.clear();
+	fileslist.clear();
 }
 
 WEBINTERFACE_CLASS * web_interface;

esp8266/webinterface.h

@@ -45,6 +45,7 @@ class WEBINTERFACE_CLASS
   String answer4M114;
   String answer4M220;
   String answer4M221;
+  STORESTRINGS_CLASS fileslist;
   uint32_t last_temp;
   STORESTRINGS_CLASS error_msg;
   STORESTRINGS_CLASS info_msg;