Follow the parent category options

PR #19957.
Closes #19941.

src/base/CMakeLists.txt

@@ -14,6 +14,7 @@ add_library(qbt_base STATIC
     bittorrent/common.h
     bittorrent/customstorage.h
     bittorrent/dbresumedatastorage.h
+    bittorrent/downloadpathoption.h
     bittorrent/downloadpriority.h
     bittorrent/extensiondata.h
     bittorrent/filesearcher.h
@@ -118,6 +119,7 @@ add_library(qbt_base STATIC
     bittorrent/categoryoptions.cpp
     bittorrent/customstorage.cpp
     bittorrent/dbresumedatastorage.cpp
+    bittorrent/downloadpathoption.cpp
     bittorrent/downloadpriority.cpp
     bittorrent/filesearcher.cpp
     bittorrent/filterparserthread.cpp

src/base/bittorrent/categoryoptions.cpp

@@ -1,6 +1,6 @@
 /*
  * Bittorrent Client using Qt and libtorrent.
- * Copyright (C) 2021  Vladimir Golovnev <glassez@yandex.ru>
+ * Copyright (C) 2021-2023  Vladimir Golovnev <glassez@yandex.ru>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -67,12 +67,6 @@ QJsonObject BitTorrent::CategoryOptions::toJSON() const
     };
 }
 
-bool BitTorrent::operator==(const BitTorrent::CategoryOptions::DownloadPathOption &left, const BitTorrent::CategoryOptions::DownloadPathOption &right)
-{
-    return ((left.enabled == right.enabled)
-            && (left.path == right.path));
-}
-
 bool BitTorrent::operator==(const BitTorrent::CategoryOptions &left, const BitTorrent::CategoryOptions &right)
 {
     return ((left.savePath == right.savePath)

src/base/bittorrent/categoryoptions.h

@@ -1,6 +1,6 @@
 /*
  * Bittorrent Client using Qt and libtorrent.
- * Copyright (C) 2021  Vladimir Golovnev <glassez@yandex.ru>
+ * Copyright (C) 2021-2023  Vladimir Golovnev <glassez@yandex.ru>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -33,6 +33,7 @@
 #include <QString>
 
 #include "base/path.h"
+#include "downloadpathoption.h"
 
 class QJsonObject;
 
@@ -40,12 +41,6 @@ namespace BitTorrent
 {
     struct CategoryOptions
     {
-        struct DownloadPathOption
-        {
-            bool enabled;
-            Path path;
-        };
-
         Path savePath;
         std::optional<DownloadPathOption> downloadPath;
 
@@ -53,6 +48,5 @@ namespace BitTorrent
         QJsonObject toJSON() const;
     };
 
-    bool operator==(const CategoryOptions::DownloadPathOption &left, const CategoryOptions::DownloadPathOption &right);
     bool operator==(const CategoryOptions &left, const CategoryOptions &right);
 }

src/base/bittorrent/downloadpathoption.cpp

@@ -0,0 +1,34 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2021-2023  Vladimir Golovnev <glassez@yandex.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ */
+
+#include "downloadpathoption.h"
+
+bool BitTorrent::operator==(const DownloadPathOption &left, const DownloadPathOption &right)
+{
+    return ((left.enabled == right.enabled) && (left.path == right.path));
+}

src/base/bittorrent/downloadpathoption.h

@@ -0,0 +1,42 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2021-2023  Vladimir Golovnev <glassez@yandex.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ */
+
+#pragma once
+
+#include "base/path.h"
+
+namespace BitTorrent
+{
+    struct DownloadPathOption
+    {
+        bool enabled = false;
+        Path path;
+    };
+
+    bool operator==(const DownloadPathOption &left, const DownloadPathOption &right);
+}

src/base/bittorrent/session.h

@@ -155,13 +155,17 @@ namespace BitTorrent
         virtual void setDownloadPathEnabled(bool enabled) = 0;
 
         static bool isValidCategoryName(const QString &name);
+        static QString subcategoryName(const QString &category);
+        static QString parentCategoryName(const QString &category);
         // returns category itself and all top level categories
         static QStringList expandCategory(const QString &category);
 
         virtual QStringList categories() const = 0;
         virtual CategoryOptions categoryOptions(const QString &categoryName) const = 0;
         virtual Path categorySavePath(const QString &categoryName) const = 0;
+        virtual Path categorySavePath(const QString &categoryName, const CategoryOptions &options) const = 0;
         virtual Path categoryDownloadPath(const QString &categoryName) const = 0;
+        virtual Path categoryDownloadPath(const QString &categoryName, const CategoryOptions &options) const = 0;
         virtual bool addCategory(const QString &name, const CategoryOptions &options = {}) = 0;
         virtual bool editCategory(const QString &name, const CategoryOptions &options) = 0;
         virtual bool removeCategory(const QString &name) = 0;

src/base/bittorrent/sessionimpl.cpp

@@ -355,6 +355,24 @@ bool Session::isValidCategoryName(const QString &name)
     return (name.isEmpty() || (name.indexOf(re) == 0));
 }
 
+QString Session::subcategoryName(const QString &category)
+{
+    const int sepIndex = category.lastIndexOf(u'/');
+    if (sepIndex >= 0)
+        return category.mid(sepIndex + 1);
+
+    return category;
+}
+
+QString Session::parentCategoryName(const QString &category)
+{
+    const int sepIndex = category.lastIndexOf(u'/');
+    if (sepIndex >= 0)
+        return category.left(sepIndex);
+
+    return {};
+}
+
 bool Session::isValidTag(const QString &tag)
 {
     return (!tag.trimmed().isEmpty() && !tag.contains(u','));
@@ -782,34 +800,77 @@ CategoryOptions SessionImpl::categoryOptions(const QString &categoryName) const
 
 Path SessionImpl::categorySavePath(const QString &categoryName) const
 {
-    const Path basePath = savePath();
+    return categorySavePath(categoryName, categoryOptions(categoryName));
+}
+
+Path SessionImpl::categorySavePath(const QString &categoryName, const CategoryOptions &options) const
+{
+    Path basePath = savePath();
     if (categoryName.isEmpty())
         return basePath;
 
-    Path path = m_categories.value(categoryName).savePath;
-    if (path.isEmpty()) // use implicit save path
-        path = Utils::Fs::toValidPath(categoryName);
+    Path path = options.savePath;
+    if (path.isEmpty())
+    {
+        // use implicit save path
+        if (isSubcategoriesEnabled())
+        {
+            path = Utils::Fs::toValidPath(subcategoryName(categoryName));
+            basePath = categorySavePath(parentCategoryName(categoryName));
+        }
+        else
+        {
+            path = Utils::Fs::toValidPath(categoryName);
+        }
+    }
 
     return (path.isAbsolute() ? path : (basePath / path));
 }
 
 Path SessionImpl::categoryDownloadPath(const QString &categoryName) const
 {
-    const CategoryOptions categoryOptions = m_categories.value(categoryName);
-    const CategoryOptions::DownloadPathOption downloadPathOption =
-            categoryOptions.downloadPath.value_or(CategoryOptions::DownloadPathOption {isDownloadPathEnabled(), downloadPath()});
+    return categoryDownloadPath(categoryName, categoryOptions(categoryName));
+}
+
+Path SessionImpl::categoryDownloadPath(const QString &categoryName, const CategoryOptions &options) const
+{
+    const DownloadPathOption downloadPathOption = resolveCategoryDownloadPathOption(categoryName, options.downloadPath);
     if (!downloadPathOption.enabled)
         return {};
 
-    const Path basePath = downloadPath();
     if (categoryName.isEmpty())
-        return basePath;
+        return downloadPath();
 
-    const Path path = (!downloadPathOption.path.isEmpty()
-                          ? downloadPathOption.path
-                          : Utils::Fs::toValidPath(categoryName)); // use implicit download path
+    const bool useSubcategories = isSubcategoriesEnabled();
+    const QString name = useSubcategories ? subcategoryName(categoryName) : categoryName;
+    const Path path = !downloadPathOption.path.isEmpty()
+            ? downloadPathOption.path
+            : Utils::Fs::toValidPath(name); // use implicit download path
 
-    return (path.isAbsolute() ? path : (basePath / path));
+    if (path.isAbsolute())
+        return path;
+
+    const QString parentName = useSubcategories ? parentCategoryName(categoryName) : QString();
+    CategoryOptions parentOptions = categoryOptions(parentName);
+    // Even if download path of parent category is disabled (directly or by inheritance)
+    // we need to construct the one as if it would be enabled.
+    if (!parentOptions.downloadPath || !parentOptions.downloadPath->enabled)
+        parentOptions.downloadPath = {true, {}};
+    const Path parentDownloadPath = categoryDownloadPath(parentName, parentOptions);
+    const Path basePath = parentDownloadPath.isEmpty() ? downloadPath() : parentDownloadPath;
+    return (basePath / path);
+}
+
+DownloadPathOption SessionImpl::resolveCategoryDownloadPathOption(const QString &categoryName, const std::optional<DownloadPathOption> &option) const
+{
+    if (categoryName.isEmpty())
+        return {isDownloadPathEnabled(), Path()};
+
+    if (option.has_value())
+        return *option;
+
+    const QString parentName = isSubcategoriesEnabled() ? parentCategoryName(categoryName) : QString();
+    return resolveCategoryDownloadPathOption(parentName, categoryOptions(parentName).downloadPath);
 }
 
 bool SessionImpl::addCategory(const QString &name, const CategoryOptions &options)
@@ -3163,8 +3224,8 @@ void SessionImpl::setDownloadPath(const Path &path)
         {
             const QString &categoryName = it.key();
             const CategoryOptions &categoryOptions = it.value();
-            const CategoryOptions::DownloadPathOption downloadPathOption =
-                    categoryOptions.downloadPath.value_or(CategoryOptions::DownloadPathOption {isDownloadPathEnabled(), downloadPath()});
+            const DownloadPathOption downloadPathOption =
+                    categoryOptions.downloadPath.value_or(DownloadPathOption {isDownloadPathEnabled(), downloadPath()});
             if (downloadPathOption.enabled && downloadPathOption.path.isRelative())
                 affectedCatogories.insert(categoryName);
         }

src/base/bittorrent/sessionimpl.h

@@ -142,7 +142,9 @@ namespace BitTorrent
         QStringList categories() const override;
         CategoryOptions categoryOptions(const QString &categoryName) const override;
         Path categorySavePath(const QString &categoryName) const override;
+        Path categorySavePath(const QString &categoryName, const CategoryOptions &options) const override;
         Path categoryDownloadPath(const QString &categoryName) const override;
+        Path categoryDownloadPath(const QString &categoryName, const CategoryOptions &options) const override;
         bool addCategory(const QString &name, const CategoryOptions &options = {}) override;
         bool editCategory(const QString &name, const CategoryOptions &options) override;
         bool removeCategory(const QString &name) override;
@@ -574,6 +576,7 @@ namespace BitTorrent
         void loadCategories();
         void storeCategories() const;
         void upgradeCategories();
+        DownloadPathOption resolveCategoryDownloadPathOption(const QString &categoryName, const std::optional<DownloadPathOption> &option) const;
 
         void saveStatistics() const;
         void loadStatistics();

src/gui/torrentcategorydialog.cpp

@@ -169,14 +169,13 @@ void TorrentCategoryDialog::setCategoryOptions(const BitTorrent::CategoryOptions
 
 void TorrentCategoryDialog::categoryNameChanged(const QString &categoryName)
 {
-    const Path categoryPath = Utils::Fs::toValidPath(categoryName);
     const auto *btSession = BitTorrent::Session::instance();
-    m_ui->comboSavePath->setPlaceholder(btSession->savePath() / categoryPath);
+    m_ui->comboSavePath->setPlaceholder(btSession->categorySavePath(categoryName, categoryOptions()));
 
     const int index = m_ui->comboUseDownloadPath->currentIndex();
-    const bool useDownloadPath = (index == 1) || ((index == 0) && BitTorrent::Session::instance()->isDownloadPathEnabled());
+    const bool useDownloadPath = (index == 1) || ((index == 0) && btSession->isDownloadPathEnabled());
     if (useDownloadPath)
-        m_ui->comboDownloadPath->setPlaceholder(btSession->downloadPath() / categoryPath);
+        m_ui->comboDownloadPath->setPlaceholder(btSession->categoryDownloadPath(categoryName, categoryOptions()));
 
     m_ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(!categoryName.isEmpty());
 }
@@ -190,8 +189,9 @@ void TorrentCategoryDialog::useDownloadPathChanged(const int index)
     m_ui->comboDownloadPath->setEnabled(index == 1);
     m_ui->comboDownloadPath->setSelectedPath((index == 1) ? m_lastEnteredDownloadPath : Path());
 
+    const auto *btSession = BitTorrent::Session::instance();
     const QString categoryName = m_ui->textCategoryName->text();
-    const Path categoryPath = BitTorrent::Session::instance()->downloadPath() / Utils::Fs::toValidPath(categoryName);
-    const bool useDownloadPath = (index == 1) || ((index == 0) && BitTorrent::Session::instance()->isDownloadPathEnabled());
+    const bool useDownloadPath = (index == 1) || ((index == 0) && btSession->isDownloadPathEnabled());
+    const Path categoryPath = btSession->categoryDownloadPath(categoryName, categoryOptions());
     m_ui->comboDownloadPath->setPlaceholder(useDownloadPath ? categoryPath : Path());
 }