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+/****************************************************************************
+**
+** Copyright (C) 2013 David Faure <faure@kde.org>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+** of its contributors may be used to endorse or promote products derived
+** from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+bool verbose = parser.isSet("verbose");
+//! [0]
+
+//! [1]
+// Usage: image-editor file
+//
+// Arguments:
+// file The file to open.
+parser.addPositionalArgument("file", QCoreApplication::translate("main", "The file to open."));
+
+// Usage: web-browser [urls...]
+//
+// Arguments:
+// urls URLs to open, optionally.
+parser.addPositionalArgument("urls", QCoreApplication::translate("main", "URLs to open, optionally."), "[urls...]");
+
+// Usage: cp source destination
+//
+// Arguments:
+// source Source file to copy.
+// destination Destination directory.
+parser.addPositionalArgument("source", QCoreApplication::translate("main", "Source file to copy."));
+parser.addPositionalArgument("destination", QCoreApplication::translate("main", "Destination directory."));
+//! [1]
+
+//! [2]
+parser.addPositionalArgument("command", "The command to execute.");
+
+// Call parse() to find out the positional arguments.
+parser.parse(QCoreApplication::arguments());
+
+const QStringList args = parser.positionalArguments();
+const QString command = args.isEmpty() ? QString() : args.first();
+if (command == "resize") {
+ parser.clearPositionalArguments();
+ parser.addPositionalArgument("resize", "Resize the object to a new size.", "resize [resize_options]");
+ parser.addOption(QCommandLineOption("size", "New size.", "new_size"));
+ parser.process(app);
+ // ...
+}
+
+This code results in context-dependent help:
+
+$ tool --help
+Usage: tool command
+
+Arguments:
+ command The command to execute.
+
+$ tool resize --help
+Usage: tool resize [resize_options]
+
+Options:
+ --size <size> New size.
+
+Arguments:
+ resize Resize the object to a new size.
+
+//! [2]
+
+//! [3]
+int main(int argc, char *argv[])
+{
+ QCoreApplication app(argc, argv);
+ app.setApplicationName("my-copy-program");
+ app.setApplicationVersion("1.0");
+
+ QCommandLineParser parser;
+ parser.addHelpOption("Test helper");
+ parser.addVersionOption();
+ parser.addRemainingArgument("source", QCoreApplication::translate("main", "Source file to copy."));
+ parser.addRemainingArgument("destination", QCoreApplication::translate("main", "Destination directory."));
+
+ // A boolean option with a single name (-p)
+ QCommandLineOption showProgressOption("p", QCoreApplication::translate("main", "Show progress during copy"));
+ parser.addOption(showProgressOption);
+
+ // A boolean option with multiple names (-f, --force)
+ QCommandLineOption forceOption(QStringList() << "f" << "force", "Overwrite existing files.");
+ parser.addOption(forceOption);
+
+ // An option with a value
+ QCommandLineOption targetDirectoryOption(QStringList() << "t" << "target-directory",
+ QCoreApplication::translate("main", "Copy all source files into <directory>."),
+ QCoreApplication::translate("main", "directory"));
+ parser.addOption(targetDirectoryOption);
+
+ // Process the actual command line arguments given by the user
+ parser.process(app);
+
+ const QStringList args = parser.remainingArguments();
+ // source is args.at(0), destination is args.at(1)
+
+ bool showProgress = parser.isSet(showProgressOption);
+ bool force = parser.isSet(forceOption);
+ QString targetDir = parser.value(targetDirectoryOption);
+ // ...
+}
+
+//! [3]