├── COPYING ├── README.md ├── main.cpp ├── screenshot.png ├── selectdefaultapplication.desktop ├── selectdefaultapplication.png ├── selectdefaultapplication.pro ├── widget.cpp └── widget.h /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc. 5 | 51 Franklin Steet, Fifth Floor, Boston, MA 02111-1307 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | 294 | Copyright (C) 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License 307 | along with this program; if not, write to the Free Software 308 | Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston, MA 02111-1307 USA 309 | 310 | 311 | Also add information on how to contact you by electronic and paper mail. 312 | 313 | If the program is interactive, make it output a short notice like this 314 | when it starts in an interactive mode: 315 | 316 | Gnomovision version 69, Copyright (C) year name of author 317 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 318 | This is free software, and you are welcome to redistribute it 319 | under certain conditions; type `show c' for details. 320 | 321 | The hypothetical commands `show w' and `show c' should show the appropriate 322 | parts of the General Public License. Of course, the commands you use may 323 | be called something other than `show w' and `show c'; they could even be 324 | mouse-clicks or menu items--whatever suits your program. 325 | 326 | You should also get your employer (if you work as a programmer) or your 327 | school, if any, to sign a "copyright disclaimer" for the program, if 328 | necessary. Here is a sample; alter the names: 329 | 330 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 331 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 332 | 333 | , 1 April 1989 334 | Ty Coon, President of Vice 335 | 336 | This General Public License does not permit incorporating your program into 337 | proprietary programs. If your program is a subroutine library, you may 338 | consider it more useful to permit linking proprietary applications with the 339 | library. If this is what you want to do, use the GNU Library General 340 | Public License instead of this License. 341 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Select Default Application 2 | ========================== 3 | 4 | A very simple application that lets you define default applications on Linux in a sane way. 5 | 6 | ![screenshot](/screenshot.png) 7 | 8 | 9 | How it works 10 | ------------ 11 | 12 | Basically it just loads all installed applications by reading their .desktop 13 | files, reads the MimeType fields to see what it supports, and updates 14 | ~/.config/mimeapps.list with what the user wants. 15 | 16 | 17 | Links 18 | ----- 19 | 20 | * https://specifications.freedesktop.org/mime-apps-spec/mime-apps-spec-latest.html 21 | * https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html 22 | * https://specifications.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html 23 | 24 | -------------------------------------------------------------------------------- /main.cpp: -------------------------------------------------------------------------------- 1 | #include "widget.h" 2 | #include 3 | 4 | int main(int argc, char *argv[]) 5 | { 6 | QApplication a(argc, argv); 7 | Widget w; 8 | w.show(); 9 | 10 | return a.exec(); 11 | } 12 | -------------------------------------------------------------------------------- /screenshot.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/sandsmark/selectdefaultapplication/c752df6ba8caceeef54bcf6527f1bccc2ca8202a/screenshot.png -------------------------------------------------------------------------------- /selectdefaultapplication.desktop: -------------------------------------------------------------------------------- 1 | [Desktop Entry] 2 | Type=Application 3 | Name=selectdefaultapplication 4 | GenericName=Select Default Application 5 | Comment=Allows you to easily select default application to open files. 6 | Categories=Utility; 7 | TryExec=selectdefaultapplication 8 | Exec=selectdefaultapplication 9 | Icon=selectdefaultapplication 10 | -------------------------------------------------------------------------------- /selectdefaultapplication.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/sandsmark/selectdefaultapplication/c752df6ba8caceeef54bcf6527f1bccc2ca8202a/selectdefaultapplication.png -------------------------------------------------------------------------------- /selectdefaultapplication.pro: -------------------------------------------------------------------------------- 1 | #------------------------------------------------- 2 | # 3 | # Project created by QtCreator 2018-04-06T18:50:51 4 | # 5 | #------------------------------------------------- 6 | 7 | QT += core gui 8 | 9 | greaterThan(QT_MAJOR_VERSION, 4): QT += widgets 10 | 11 | TARGET = selectdefaultapplication 12 | TEMPLATE = app 13 | 14 | # The following define makes your compiler emit warnings if you use 15 | # any feature of Qt which has been marked as deprecated (the exact warnings 16 | # depend on your compiler). Please consult the documentation of the 17 | # deprecated API in order to know how to port your code away from it. 18 | DEFINES += QT_DEPRECATED_WARNINGS 19 | 20 | # You can also make your code fail to compile if you use deprecated APIs. 21 | # In order to do so, uncomment the following line. 22 | # You can also select to disable deprecated APIs only up to a certain version of Qt. 23 | #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 24 | 25 | 26 | SOURCES += \ 27 | main.cpp \ 28 | widget.cpp 29 | 30 | HEADERS += \ 31 | widget.h 32 | -------------------------------------------------------------------------------- /widget.cpp: -------------------------------------------------------------------------------- 1 | #include "widget.h" 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | #include 13 | #include 14 | 15 | Widget::Widget(QWidget *parent) 16 | : QWidget(parent) 17 | { 18 | for (const QString &dirPath : QStandardPaths::standardLocations(QStandardPaths::ApplicationsLocation)) { 19 | qDebug() << "Loading applications from" << dirPath; 20 | QDir applicationsDir(dirPath); 21 | 22 | for (const QFileInfo &file : applicationsDir.entryInfoList(QStringList("*.desktop"))) { 23 | loadDesktopFile(file); 24 | } 25 | } 26 | 27 | // Check that we shit with multiple .desktop files, but some nodisplay files 28 | for (const QString &appId : m_supportedMimetypes.keys()) { 29 | if (!m_desktopFileNames.contains(appId)) { 30 | qWarning() << appId << "does not have an associated desktop file!"; 31 | continue; 32 | } 33 | 34 | if (m_applicationNames[appId].isEmpty()) { 35 | qWarning() << "Missing name" << appId; 36 | m_applicationNames[appId] = appId; 37 | } 38 | } 39 | 40 | // Preload up front, so it doesn't get sluggish when selecting applications supporting a lot 41 | const QIcon unknownIcon = QIcon::fromTheme("unknown"); 42 | 43 | // TODO: check if QT_QPA_PLATFORMTHEME is set to plasma or sandsmark, 44 | // if so just use the functioning QIcon::fromTheme() 45 | // We do this manually because non-Plasma-platforms icon loading is extremely slow (I blame GTK and its crappy icon cache) 46 | for (const QString &searchPath : (QIcon::themeSearchPaths() + QIcon::fallbackSearchPaths())) { 47 | loadIcons(searchPath + QIcon::themeName()); 48 | loadIcons(searchPath); 49 | } 50 | 51 | for (const QString &mimetypeName : m_supportedMimetypes.values()) { 52 | if (m_mimeTypeIcons.contains(mimetypeName)) { 53 | continue; 54 | } 55 | const QMimeType mimetype = m_mimeDb.mimeTypeForName(mimetypeName); 56 | 57 | QString iconName = mimetype.iconName(); 58 | QIcon icon(m_iconPaths.value(iconName)); 59 | if (!icon.isNull()) { 60 | m_mimeTypeIcons[mimetypeName] = icon; 61 | continue; 62 | } 63 | icon = QIcon(m_iconPaths.value(mimetype.genericIconName())); 64 | if (!icon.isNull()) { 65 | m_mimeTypeIcons[mimetypeName] = icon; 66 | continue; 67 | } 68 | int split = iconName.lastIndexOf('+'); 69 | if (split != -1) { 70 | iconName.truncate(split); 71 | icon = QIcon(m_iconPaths.value(iconName)); 72 | if (!icon.isNull()) { 73 | m_mimeTypeIcons[mimetypeName] = icon; 74 | continue; 75 | } 76 | } 77 | split = iconName.lastIndexOf('-'); 78 | if (split != -1) { 79 | iconName.truncate(split); 80 | icon = QIcon(m_iconPaths.value(iconName)); 81 | if (!icon.isNull()) { 82 | m_mimeTypeIcons[mimetypeName] = icon; 83 | continue; 84 | } 85 | } 86 | icon = QIcon(m_iconPaths.value(mimetype.genericIconName())); 87 | if (!icon.isNull()) { 88 | m_mimeTypeIcons[mimetypeName] = icon; 89 | continue; 90 | } 91 | 92 | m_mimeTypeIcons[mimetypeName] = unknownIcon; 93 | } 94 | 95 | QHBoxLayout *mainLayout = new QHBoxLayout; 96 | setLayout(mainLayout); 97 | m_applicationList = new QTreeWidget; 98 | mainLayout->addWidget(m_applicationList); 99 | 100 | QGridLayout *rightLayout = new QGridLayout; 101 | mainLayout->addLayout(rightLayout); 102 | 103 | m_setDefaultButton = new QPushButton(tr("Set as default application for these file types")); 104 | m_setDefaultButton->setEnabled(false); 105 | 106 | m_mimetypeList = new QListWidget; 107 | m_mimetypeList->setSelectionMode(QAbstractItemView::MultiSelection); 108 | 109 | rightLayout->addWidget(m_mimetypeList); 110 | rightLayout->addWidget(m_setDefaultButton); 111 | 112 | QStringList types = m_applications.keys(); 113 | std::sort(types.begin(), types.end()); 114 | for (const QString &type : types) { 115 | QTreeWidgetItem *typeItem = new QTreeWidgetItem(QStringList(type)); 116 | QStringList applications = m_applications[type].values(); 117 | std::sort(applications.begin(), applications.end(), [=](const QString &a, const QString &b) { 118 | return m_applicationNames[a] < m_applicationNames[b]; 119 | }); 120 | for (const QString &application : applications) { 121 | QTreeWidgetItem *appItem = new QTreeWidgetItem(QStringList(m_applicationNames[application])); 122 | appItem->setData(0, Qt::UserRole, application); 123 | appItem->setIcon(0, QIcon::fromTheme(m_applicationIcons[application])); 124 | typeItem->addChild(appItem); 125 | } 126 | m_applicationList->addTopLevelItem(typeItem); 127 | } 128 | m_applicationList->setHeaderHidden(true); 129 | 130 | connect(m_applicationList, &QTreeWidget::itemSelectionChanged, this, &Widget::onMimetypeSelected); 131 | connect(m_setDefaultButton, &QPushButton::clicked, this, &Widget::onSetDefaultClicked); 132 | } 133 | 134 | Widget::~Widget() 135 | { 136 | 137 | } 138 | 139 | void Widget::onMimetypeSelected() 140 | { 141 | m_setDefaultButton->setEnabled(false); 142 | m_mimetypeList->clear(); 143 | 144 | QList selectedItems = m_applicationList->selectedItems(); 145 | if (selectedItems.count() != 1) { 146 | return; 147 | } 148 | 149 | const QTreeWidgetItem *item = selectedItems.first(); 150 | if (!item->parent()) { 151 | return; 152 | } 153 | 154 | const QString mimetypeGroup = item->parent()->text(0); 155 | const QString application = item->data(0, Qt::UserRole).toString(); 156 | 157 | QStringList supported = m_supportedMimetypes.values(application); 158 | 159 | // E. g. kwrite and kate only indicate support for "text/plain", but 160 | // they're nice for things like c source files. 161 | QSet secondary; 162 | const QStringList currentSupported = m_supportedMimetypes.values(application); 163 | for (const QString &mimetype : currentSupported) { 164 | for (const QString &child : m_childMimeTypes.values(mimetype)) { 165 | supported.append(child); 166 | secondary.insert(child); 167 | } 168 | } 169 | supported.removeDuplicates(); 170 | 171 | for (const QString &supportedMime : supported) { 172 | if (!supportedMime.startsWith(mimetypeGroup)) { 173 | continue; 174 | } 175 | const QMimeType mimetype = m_mimeDb.mimeTypeForName(supportedMime); 176 | const QString mimeName = mimetype.name(); 177 | QString name = mimetype.filterString().trimmed(); 178 | if (name.isEmpty()) { 179 | name = mimetype.comment().trimmed(); 180 | } 181 | if (name.isEmpty()) { 182 | name = mimeName; 183 | } else { 184 | name += '\n' + mimeName; 185 | } 186 | QListWidgetItem *item = new QListWidgetItem(name); 187 | item->setData(Qt::UserRole, mimeName); 188 | item->setIcon(m_mimeTypeIcons[supportedMime]); 189 | m_mimetypeList->addItem(item); 190 | item->setSelected(!secondary.contains(mimeName)); 191 | } 192 | 193 | m_setDefaultButton->setEnabled(m_mimetypeList->count() > 0); 194 | } 195 | 196 | void Widget::onSetDefaultClicked() 197 | { 198 | QList selectedItems = m_applicationList->selectedItems(); 199 | if (selectedItems.count() != 1) { 200 | return; 201 | } 202 | 203 | const QTreeWidgetItem *item = selectedItems.first(); 204 | if (!item->parent()) { 205 | return; 206 | } 207 | 208 | const QString application = item->data(0, Qt::UserRole).toString(); 209 | if (application.isEmpty()) { 210 | return; 211 | } 212 | 213 | QSet unselected; 214 | QSet selected; 215 | for (int i=0; icount(); i++) { 216 | QListWidgetItem *item = m_mimetypeList->item(i); 217 | const QString name = item->data(Qt::UserRole).toString(); 218 | if (item->isSelected()) { 219 | selected.insert(name); 220 | } else { 221 | unselected.insert(name); 222 | } 223 | } 224 | 225 | setDefault(application, selected, unselected); 226 | } 227 | 228 | void Widget::loadDesktopFile(const QFileInfo &fileInfo) 229 | { 230 | // Ugliest implementation of .desktop file reading ever 231 | 232 | QFile file(fileInfo.absoluteFilePath()); 233 | if (!file.open(QIODevice::ReadOnly)) { 234 | qDebug() << "Failed to open" << fileInfo.fileName(); 235 | return; 236 | } 237 | 238 | QStringList mimetypes; 239 | QString appName; 240 | QString appId = fileInfo.fileName(); 241 | QString iconName; 242 | 243 | bool inCorrectGroup = false; 244 | bool noDisplay = false; 245 | 246 | while (!file.atEnd()) { 247 | QString line = file.readLine().simplified(); 248 | 249 | if (line.startsWith('[')) { 250 | inCorrectGroup = (line == "[Desktop Entry]"); 251 | continue; 252 | } 253 | 254 | if (!inCorrectGroup) { 255 | continue; 256 | } 257 | 258 | if (line.startsWith("MimeType")) { 259 | line.remove(0, line.indexOf('=') + 1); 260 | mimetypes = line.split(';', Qt::SkipEmptyParts); 261 | continue; 262 | } 263 | 264 | if (line.startsWith("Name") && !line.contains('[')) { 265 | line.remove(0, line.indexOf('=') + 1); 266 | appName = line; 267 | continue; 268 | } 269 | 270 | if (line.startsWith("Icon")) { 271 | line.remove(0, line.indexOf('=') + 1); 272 | iconName = line; 273 | continue; 274 | } 275 | 276 | if (line.startsWith("Exec")) { 277 | line.remove(0, line.indexOf('=') + 1); 278 | if (line.isEmpty()) { 279 | continue; 280 | } 281 | QStringList parts = line.split(' '); 282 | if (parts.first() == "env" && parts.count() > 2) { 283 | line = parts[2]; 284 | } 285 | 286 | appId = line; 287 | continue; 288 | } 289 | 290 | if (line.startsWith("NoDisplay=") && line.contains("true", Qt::CaseInsensitive)) { 291 | noDisplay = true; 292 | } 293 | } 294 | 295 | if (!iconName.isEmpty() && m_applicationIcons[appId].isEmpty()) { 296 | m_applicationIcons[appId] = iconName; 297 | } 298 | 299 | // If an application has a .desktop file without NoDisplay use that, otherwise use one of the ones with NoDisplay anyways 300 | if (!noDisplay || !m_desktopFileNames.contains(appId)) { 301 | m_desktopFileNames[appId] = fileInfo.fileName(); 302 | } 303 | 304 | if (!appName.isEmpty() && m_applicationNames[appId].isEmpty()) { 305 | m_applicationNames[appId] = appName; 306 | } 307 | 308 | if (mimetypes.isEmpty()) { 309 | return; 310 | } 311 | 312 | const QMimeType octetStream = m_mimeDb.mimeTypeForName("application/octet-stream"); 313 | for (const QString &readMimeName : mimetypes) { 314 | // Resolve aliases etc 315 | const QMimeType mimetype = m_mimeDb.mimeTypeForName(readMimeName.trimmed()); 316 | if (!mimetype.isValid()) { 317 | continue; 318 | } 319 | 320 | const QString mimetypeName = mimetype.name(); 321 | for (const QString &parent : mimetype.parentMimeTypes()) { 322 | if (parent == "application/octet-stream") { 323 | break; 324 | } 325 | m_childMimeTypes.insert(parent, mimetypeName); 326 | } 327 | if (m_supportedMimetypes.contains(appId, mimetypeName)) { 328 | continue; 329 | } 330 | 331 | const QStringList parts = mimetypeName.split('/'); 332 | if (parts.count() != 2) { 333 | continue; 334 | } 335 | 336 | const QString type = parts[0].trimmed(); 337 | 338 | m_applications[type].insert(appId); 339 | m_supportedMimetypes.insert(appId, mimetypeName); 340 | } 341 | } 342 | 343 | void Widget::setDefault(const QString &appName, const QSet &mimetypes, const QSet &unselectedMimetypes) 344 | { 345 | QString desktopFile = m_desktopFileNames.value(appName); 346 | if (desktopFile.isEmpty()) { 347 | qWarning() << "invalid" << appName; 348 | return; 349 | } 350 | 351 | const QString filePath = QDir(QStandardPaths::writableLocation(QStandardPaths::ConfigLocation)).absoluteFilePath("mimeapps.list"); 352 | QFile file(filePath); 353 | 354 | // Read in existing mimeapps.list, skipping the lines for the mimetypes we're updating 355 | QList existingContent; 356 | QList existingAssociations; 357 | if (file.open(QIODevice::ReadOnly)) { 358 | bool inCorrectGroup = false; 359 | while (!file.atEnd()) { 360 | const QByteArray line = file.readLine().trimmed(); 361 | 362 | if (line.isEmpty()) { 363 | continue; 364 | } 365 | 366 | if (line.startsWith('[')) { 367 | inCorrectGroup = (line == "[Default Applications]"); 368 | if (!inCorrectGroup) { 369 | existingContent.append(line); 370 | } 371 | continue; 372 | } 373 | 374 | if (!inCorrectGroup) { 375 | existingContent.append(line); 376 | continue; 377 | } 378 | 379 | if (!line.contains('=')) { 380 | existingAssociations.append(line); 381 | continue; 382 | } 383 | 384 | const QString mimetype = m_mimeDb.mimeTypeForName(line.split('=').first().trimmed()).name(); 385 | if (!mimetypes.contains(mimetype) && !unselectedMimetypes.contains(mimetype)) { 386 | existingAssociations.append(line); 387 | } 388 | } 389 | 390 | file.close(); 391 | } else { 392 | qDebug() << "Unable to open file for reading"; 393 | } 394 | 395 | if (!file.open(QIODevice::WriteOnly)) { 396 | QMessageBox::warning(this, tr("Failed to store settings"), file.errorString()); 397 | return; 398 | } 399 | 400 | for (const QByteArray &line : existingContent) { 401 | file.write(line + '\n'); 402 | } 403 | file.write("\n[Default Applications]\n"); 404 | for (const QByteArray &line : existingAssociations) { 405 | file.write(line + '\n'); 406 | } 407 | 408 | for (const QString &mimetype : mimetypes) { 409 | file.write(QString(mimetype + '=' + m_desktopFileNames[appName] + '\n').toUtf8()); 410 | } 411 | 412 | return; 413 | } 414 | 415 | void Widget::loadIcons(const QString &path) 416 | { 417 | QFileInfo fi(path); 418 | if (!fi.exists() || !fi.isDir()) { 419 | return; 420 | } 421 | // TODO: avoid hardcoding 422 | QStringList imageTypes({"*.svg", "*.svgz", "*.png", "*.xpm"}); 423 | QDirIterator it(path, imageTypes, QDir::Files, QDirIterator::Subdirectories); 424 | 425 | while (it.hasNext()) { 426 | it.next(); 427 | fi = it.fileInfo(); 428 | 429 | const QString name = fi.completeBaseName(); 430 | if (m_iconPaths.contains(name)) { 431 | continue; 432 | } 433 | m_iconPaths[name] = fi.filePath(); 434 | } 435 | } 436 | -------------------------------------------------------------------------------- /widget.h: -------------------------------------------------------------------------------- 1 | #ifndef WIDGET_H 2 | #define WIDGET_H 3 | 4 | #include 5 | #include 6 | #include 7 | 8 | class QFileInfo; 9 | class QTreeWidget; 10 | class QListWidget; 11 | class QPushButton; 12 | 13 | class Widget : public QWidget 14 | { 15 | Q_OBJECT 16 | 17 | public: 18 | Widget(QWidget *parent = nullptr); 19 | ~Widget(); 20 | 21 | 22 | private slots: 23 | void onMimetypeSelected(); 24 | void onSetDefaultClicked(); 25 | 26 | private: 27 | void loadDesktopFile(const QFileInfo &fileInfo); 28 | void setDefault(const QString &appName, const QSet &mimetypes, const QSet &unselectedMimetypes); 29 | void loadIcons(const QString &path); 30 | 31 | QMultiHash m_supportedMimetypes; 32 | QMultiHash m_childMimeTypes; 33 | QHash> m_applications; 34 | QHash m_applicationIcons; 35 | QHash m_applicationNames; 36 | QHash m_desktopFileNames; 37 | 38 | QHash m_appIdToDesktopFile; 39 | 40 | QHash m_mimeTypeIcons; // for preloading icons, because that's (a bit) slooow 41 | QHash m_iconPaths; 42 | 43 | QTreeWidget *m_applicationList; 44 | QMimeDatabase m_mimeDb; 45 | QListWidget *m_mimetypeList; 46 | QPushButton *m_setDefaultButton; 47 | }; 48 | 49 | #endif // WIDGET_H 50 | --------------------------------------------------------------------------------