Cache RSS news file

data/pref.xml

@@ -76,6 +76,9 @@
       <option id="use_native_cursor" type="bool" default="false" />
       <option id="flash_layer" type="bool" default="false" />
     </section>
+    <section id="news">
+      <option id="cache_file" type="std::string" />
+    </section>
   </global>
 
   <tool>

src/app/ui/news_listbox.cpp

@@ -11,11 +11,15 @@
 
 #include "app/ui/news_listbox.h"
 
+#include "app/app.h"
+#include "app/pref/preferences.h"
 #include "app/res/http_loader.h"
 #include "app/ui/skin/skin_theme.h"
 #include "app/ui/skin/style.h"
 #include "app/xml_document.h"
+#include "base/fs.h"
 #include "base/string.h"
+#include "base/time.h"
 #include "ui/link_label.h"
 #include "ui/paint_event.h"
 #include "ui/preferred_size_event.h"
@@ -182,6 +186,11 @@ NewsListBox::NewsListBox()
   , m_timer(250, this)
 {
   m_timer.Tick.connect(&NewsListBox::onTick, this);
+
+  std::string cache = App::instance()->preferences().news.cacheFile();
+  if (!cache.empty() && base::is_file(cache) && validCache(cache))
+    parseFile(cache);
+  else
     reload();
 }
 
@@ -227,13 +236,21 @@ void NewsListBox::onTick()
     return;
   }
 
+  parseFile(fn);
+}
+
+void NewsListBox::parseFile(const std::string& filename)
+{
+  View* view = View::getView(this);
+
   XmlDocumentRef doc;
   try {
-    doc = open_xml(fn);
+    doc = open_xml(filename);
   }
   catch (...) {
     addChild(new ProblemsItem());
-    View::getView(this)->updateView();
+    if (view)
+      view->updateView();
     return;
   }
 
@@ -270,7 +287,23 @@ void NewsListBox::onTick()
   if (linkXml)
     addChild(new NewsItem(linkXml->GetText(), "More...", ""));
 
-  View::getView(this)->updateView();
+  if (view)
+    view->updateView();
+
+  // Save as cached news
+  App::instance()->preferences().news.cacheFile(filename);
+}
+
+bool NewsListBox::validCache(const std::string& filename)
+{
+  base::Time
+    now = base::current_time(),
+    time = base::get_modification_time(filename);
+
+  now.dateOnly();
+  time.dateOnly();
+
+  return (now == time);
 }
 
 } // namespace app

src/app/ui/news_listbox.h

@@ -12,6 +12,8 @@
 #include "ui/listbox.h"
 #include "ui/timer.h"
 
+#include <string>
+
 namespace app {
 
   class HttpLoader;
@@ -25,6 +27,8 @@ namespace app {
 
   private:
     void onTick();
+    void parseFile(const std::string& filename);
+    bool validCache(const std::string& filename);
 
     ui::Timer m_timer;
     HttpLoader* m_loader;

src/base/CMakeLists.txt

@@ -1,5 +1,5 @@
 # Aseprite Base Library
-# Copyright (c) 2001-2014 David Capello
+# Copyright (c) 2001-2015 David Capello
 
 include(CheckCSourceCompiles)
 include(CheckCXXSourceCompiles)
@@ -65,6 +65,7 @@ set(BASE_SOURCES
   system_console.cpp
   temp_dir.cpp
   thread.cpp
+  time.cpp
   trim_string.cpp
   version.cpp)
 

src/base/fs.h

@@ -1,5 +1,5 @@
 // Aseprite Base Library
-// Copyright (c) 2001-2013 David Capello
+// Copyright (c) 2001-2013, 2015 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -12,6 +12,8 @@
 
 namespace base {
 
+  class Time;
+
   bool is_file(const std::string& path);
   bool is_directory(const std::string& path);
 
@@ -23,6 +25,8 @@ namespace base {
   bool has_readonly_attr(const std::string& path);
   void remove_readonly_attr(const std::string& path);
 
+  Time get_modification_time(const std::string& path);
+
   void make_directory(const std::string& path);
   void make_all_directories(const std::string& path);
   void remove_directory(const std::string& path);

src/base/fs_unix.h

@@ -1,5 +1,5 @@
 // Aseprite Base Library
-// Copyright (c) 2001-2013 David Capello
+// Copyright (c) 2001-2013, 2015 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -82,6 +82,19 @@ void remove_readonly_attr(const std::string& path)
   }
 }
 
+Time get_modification_time(const std::string& path)
+{
+  struct stat sts;
+  int result = stat(path.c_str(), &sts);
+  if (result != 0)
+    return Time();
+
+  struct tm* t = localtime(&sts.st_mtime);
+  return Time(
+    t->tm_year+1900, t->tm_mon+1, t->tm_mday,
+    t->tm_hour, t->tm_min, t->tm_sec);
+}
+
 void remove_directory(const std::string& path)
 {
   int result = rmdir(path.c_str());

src/base/fs_win32.h

@@ -1,5 +1,5 @@
 // Aseprite Base Library
-// Copyright (c) 2001-2013 David Capello
+// Copyright (c) 2001-2013, 2015 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -12,6 +12,7 @@
 #include "base/path.h"
 #include "base/string.h"
 #include "base/win32_exception.h"
+#include "base/time.h"
 
 namespace base {
 
@@ -68,6 +69,24 @@ void remove_readonly_attr(const std::string& path)
     ::SetFileAttributes(fn.c_str(), attr & ~FILE_ATTRIBUTE_READONLY);
 }
 
+Time get_modification_time(const std::string& path)
+{
+  WIN32_FILE_ATTRIBUTE_DATA data;
+  ZeroMemory(&data, sizeof(data));
+
+  std::wstring fn = from_utf8(path);
+  if (!GetFileAttributesEx(fn.c_str(), GetFileExInfoStandard, (LPVOID)&data))
+    return Time();
+
+  SYSTEMTIME utc, local;
+  FileTimeToSystemTime(&data.ftLastWriteTime, &utc);
+  SystemTimeToTzSpecificLocalTime(NULL, &utc, &local);
+
+  return Time(
+    local.wYear, local.wMonth, local.wDay,
+    local.wHour, local.wMinute, local.wSecond);
+}
+
 void make_directory(const std::string& path)
 {
   BOOL result = ::CreateDirectory(from_utf8(path).c_str(), NULL);

src/base/time.cpp

@@ -0,0 +1,40 @@
+// Aseprite Base Library
+// Copyright (c) 2001-2013, 2015 David Capello
+//
+// This file is released under the terms of the MIT license.
+// Read LICENSE.txt for more information.
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "base/time.h"
+
+#if _WIN32
+  #include <windows.h>
+#else
+  #include <ctime>
+#endif
+
+namespace base {
+
+Time current_time()
+{
+#if _WIN32
+
+  SYSTEMTIME st;
+  GetLocalTime(&st);
+  return Time(st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
+
+#else
+
+  std::time_t now = std::time(nullptr);
+  struct tm* t = std::time(nullptr);
+  return Time(
+    t->tm_year+1900, t->tm_mon+1, t->tm_mday,
+    t->tm_hour, t->tm_min, t->tm_sec);
+
+#endif
+}
+
+} // namespace base

src/base/time.h

@@ -0,0 +1,53 @@
+// Aseprite Base Library
+// Copyright (c) 2001-2013, 2015 David Capello
+//
+// This file is released under the terms of the MIT license.
+// Read LICENSE.txt for more information.
+
+#ifndef BASE_TIME_H_INCLUDED
+#define BASE_TIME_H_INCLUDED
+#pragma once
+
+#include <string>
+
+namespace base {
+
+  class Time {
+  public:
+    int year, month, day;
+    int hour, minute, second;
+
+    Time(int year = 0, int month = 0, int day = 0,
+         int hour = 0, int minute = 0, int second = 0)
+      : year(year), month(month), day(day)
+      , hour(hour), minute(minute), second(second) {
+    }
+
+    bool valid() const {
+      return (year != 0 && month != 0 && day != 0);
+    }
+
+    void dateOnly() {
+      hour = minute = second = 0;
+    }
+
+    bool operator==(const Time& other) {
+      return
+        year == other.year &&
+        month == other.month &&
+        day == other.day &&
+        hour == other.hour &&
+        minute == other.minute &&
+        second == other.second;
+    }
+
+    bool operator!=(const Time& other) {
+      return !operator==(other);
+    }
+  };
+
+  Time current_time();
+
+}
+
+#endif