Finish file list

CYD-Klipper-Display/src/core/files_query.cpp

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+#include <list>
+#include "files_query.h"
+#include "../conf/global_config.h"
+#include <HTTPClient.h>
+#include <ArduinoJson.h>
+#include <HardwareSerial.h>
+
+// Always has +1 entry with a null'd name
+FILESYSTEM_FILE* last_query = NULL;
+
+FILESYSTEM_FILE* get_files(){
+    if (last_query != NULL){
+        FILESYSTEM_FILE* current = last_query;
+
+        while (current->name != NULL){
+            free(current->name);
+            current += 1;
+        }
+
+        free(last_query);
+    }
+
+    std::list<FILESYSTEM_FILE> files;
+    char buff[256] = {};
+    sprintf(buff, "http://%s:%d/server/files/list", global_config.klipperHost, global_config.klipperPort);
+    HTTPClient client;
+    client.begin(buff);
+    int httpCode = client.GET();
+    int count = 0;
+    if (httpCode == 200){
+        String payload = client.getString();
+        DynamicJsonDocument doc(60000);
+        auto a = deserializeJson(doc, payload);
+        Serial.printf("JSON PARSE: %s\n", a.c_str());
+        auto result = doc["result"].as<JsonArray>();
+        for (auto file : result){
+            FILESYSTEM_FILE f = {0};
+            const char* path = file["path"];
+            f.name = (char*)malloc(strlen(path) + 1);
+            strcpy(f.name, path);
+            f.modified = file["modified"];
+            files.push_back(f);
+            count++;
+        }
+    }
+
+    //Serial.printf("Found %d files\n", count);
+    files.sort([](FILESYSTEM_FILE a, FILESYSTEM_FILE b){return a.modified < b.modified;});
+    files.reverse(); // TODO: Reverse is unneeded here, we can iterate backwards
+
+    size_t size = sizeof(FILESYSTEM_FILE) * (files.size() + 1);
+    FILESYSTEM_FILE* result = (FILESYSTEM_FILE*)malloc(size);
+    //Serial.printf("Allocated %d bytes\n", size);
+    last_query = result;
+    result[files.size()].name = NULL;
+
+    for (auto file : files){
+        *result = file;
+        result += 1;
+    }
+
+    return last_query;
+}