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#include "abstractprocessstep.h"
#include "buildconfiguration.h"
#include "buildstep.h"
#include "ioutputparser.h"
#include "processparameters.h"
#include "project.h"
#include "projectexplorer.h"
#include "projectexplorersettings.h"
#include "target.h"
#include "task.h"

#include <coreplugin/reaper.h>

#include <utils/fileutils.h>
#include <utils/outputformatter.h>
#include <utils/qtcassert.h>
#include <utils/qtcprocess.h>

#include <QDir>
#include <QHash>
#include <QPair>
#include <QTextDecoder>
#include <QUrl>

#include <algorithm>
#include <memory>

using namespace Utils;

namespace ProjectExplorer {

/*!
    \class ProjectExplorer::AbstractProcessStep

    \brief The AbstractProcessStep class is a convenience class that can be
    used as a base class instead of BuildStep.

    It should be used as a base class if your buildstep just needs to run a process.

    Usage:
    \list
    \li Use processParameters() to configure the process you want to run
    (you need to do that before calling AbstractProcessStep::init()).
    \li Inside YourBuildStep::init() call AbstractProcessStep::init().
    \li Inside YourBuildStep::run() call AbstractProcessStep::run(), which automatically starts the process
    and by default adds the output on stdOut and stdErr to the OutputWindow.
    \li If you need to process the process output override stdOut() and/or stdErr.
    \endlist

    The two functions processStarted() and processFinished() are called after starting/finishing the process.
    By default they add a message to the output window.

    Use setEnabled() to control whether the BuildStep needs to run. (A disabled BuildStep immediately returns true,
    from the run function.)

    \sa ProjectExplorer::ProcessParameters
*/

/*!
    \fn void ProjectExplorer::AbstractProcessStep::setEnabled(bool b)

    Enables or disables a BuildStep.

    Disabled BuildSteps immediately return true from their run function.
    Should be called from init().
*/

/*!
    \fn ProcessParameters *ProjectExplorer::AbstractProcessStep::processParameters()

    Obtains a reference to the parameters for the actual process to run.

     Should be used in init().
*/

class AbstractProcessStep::Private
{
public:
    Private(AbstractProcessStep *q) : q(q) {}

    AbstractProcessStep *q;
    std::unique_ptr<Utils::QtcProcess> m_process;
    ProcessParameters m_param;
    bool m_ignoreReturnValue = false;
    bool m_lowPriority = false;
    std::unique_ptr<QTextDecoder> stdoutStream;
    std::unique_ptr<QTextDecoder> stderrStream;
    OutputFormatter *outputFormatter = nullptr;
};

AbstractProcessStep::AbstractProcessStep(BuildStepList *bsl, Core::Id id) :
    BuildStep(bsl, id),
    d(new Private(this))
{
}

AbstractProcessStep::~AbstractProcessStep()
{
    delete d;
}

void AbstractProcessStep::emitFaultyConfigurationMessage()
{
    emit addOutput(tr("Configuration is faulty. Check the Issues view for details."),
                   BuildStep::OutputFormat::NormalMessage);
}

bool AbstractProcessStep::ignoreReturnValue()
{
    return d->m_ignoreReturnValue;
}

/*!
    If \a ignoreReturnValue is set to true, then the abstractprocess step will
    return success even if the return value indicates otherwise.

    Should be called from init.
*/

void AbstractProcessStep::setIgnoreReturnValue(bool b)
{
    d->m_ignoreReturnValue = b;
}

/*!
    Reimplemented from BuildStep::init(). You need to call this from
    YourBuildStep::init().
*/

bool AbstractProcessStep::init()
{
    return !d->m_process;
}

void AbstractProcessStep::setupOutputFormatter(OutputFormatter *formatter)
{
    formatter->setDemoteErrorsToWarnings(d->m_ignoreReturnValue);
    d->outputFormatter = formatter;
    BuildStep::setupOutputFormatter(formatter);
}

/*!
    Reimplemented from BuildStep::init(). You need to call this from
    YourBuildStep::run().
*/

void AbstractProcessStep::doRun()
{
    QDir wd(d->m_param.effectiveWorkingDirectory().toString());
    if (!wd.exists()) {
        if (!wd.mkpath(wd.absolutePath())) {
            emit addOutput(tr("Could not create directory \"%1\"")
                           .arg(QDir::toNativeSeparators(wd.absolutePath())),
                           BuildStep::OutputFormat::ErrorMessage);
            finish(false);
            return;
        }
    }

    const CommandLine effectiveCommand(d->m_param.effectiveCommand(),
                                       d->m_param.effectiveArguments(),
                                       CommandLine::Raw);
    if (!effectiveCommand.executable().exists()) {
        processStartupFailed();
        finish(false);
        return;
    }

    d->stdoutStream = std::make_unique<QTextDecoder>(buildEnvironment().hasKey("VSLANG")
            ? QTextCodec::codecForName("UTF-8") : QTextCodec::codecForLocale());
    d->stderrStream = std::make_unique<QTextDecoder>(QTextCodec::codecForLocale());

    d->m_process.reset(new Utils::QtcProcess());
    d->m_process->setUseCtrlCStub(Utils::HostOsInfo::isWindowsHost());
    d->m_process->setWorkingDirectory(wd.absolutePath());
    // Enforce PWD in the environment because some build tools use that.
    // PWD can be different from getcwd in case of symbolic links (getcwd resolves symlinks).
    // For example Clang uses PWD for paths in debug info, see QTCREATORBUG-23788
    Environment envWithPwd = d->m_param.environment();
    envWithPwd.set("PWD", d->m_process->workingDirectory());
    d->m_process->setEnvironment(envWithPwd);
    d->m_process->setCommand(effectiveCommand);
    if (d->m_lowPriority && ProjectExplorerPlugin::projectExplorerSettings().lowBuildPriority)
        d->m_process->setLowPriority();

    connect(d->m_process.get(), &QProcess::readyReadStandardOutput,
            this, &AbstractProcessStep::processReadyReadStdOutput);
    connect(d->m_process.get(), &QProcess::readyReadStandardError,
            this, &AbstractProcessStep::processReadyReadStdError);
    connect(d->m_process.get(), QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
            this, &AbstractProcessStep::slotProcessFinished);

    d->m_process->start();
    if (!d->m_process->waitForStarted()) {
        processStartupFailed();
        d->m_process.reset();
        finish(false);
        return;
    }
    processStarted();
}

void AbstractProcessStep::setLowPriority()
{
    d->m_lowPriority = true;
}

void AbstractProcessStep::doCancel()
{
    Core::Reaper::reap(d->m_process.release());
}

ProcessParameters *AbstractProcessStep::processParameters()
{
    return &d->m_param;
}

void AbstractProcessStep::cleanUp(QProcess *process)
{
    // The process has finished, leftover data is read in processFinished
    processFinished(process->exitCode(), process->exitStatus());
    const bool returnValue = processSucceeded(process->exitCode(), process->exitStatus()) || d->m_ignoreReturnValue;

    d->m_process.reset();

    // Report result
    finish(returnValue);
}

/*!
    Called after the process is started.

    The default implementation adds a process-started message to the output
    message.
*/

void AbstractProcessStep::processStarted()
{
    emit addOutput(tr("Starting: \"%1\" %2")
                   .arg(QDir::toNativeSeparators(d->m_param.effectiveCommand().toString()),
                        d->m_param.prettyArguments()),
                   BuildStep::OutputFormat::NormalMessage);
}

/*!
    Called after the process is finished.

    The default implementation adds a line to the output window.
*/

void AbstractProcessStep::processFinished(int exitCode, QProcess::ExitStatus status)
{
    QString command = QDir::toNativeSeparators(d->m_param.effectiveCommand().toString());
    if (status == QProcess::NormalExit && exitCode == 0) {
        emit addOutput(tr("The process \"%1\" exited normally.").arg(command),
                       BuildStep::OutputFormat::NormalMessage);
    } else if (status == QProcess::NormalExit) {
        emit addOutput(tr("The process \"%1\" exited with code %2.")
                       .arg(command, QString::number(exitCode)),
                       BuildStep::OutputFormat::ErrorMessage);
    } else {
        emit addOutput(tr("The process \"%1\" crashed.").arg(command), BuildStep::OutputFormat::ErrorMessage);
    }
}

/*!
    Called if the process could not be started.

    By default, adds a message to the output window.
*/

void AbstractProcessStep::processStartupFailed()
{
    emit addOutput(tr("Could not start process \"%1\" %2")
                   .arg(QDir::toNativeSeparators(d->m_param.effectiveCommand().toString()),
                        d->m_param.prettyArguments()),
                   BuildStep::OutputFormat::ErrorMessage);
}

/*!
    Called to test whether a process succeeded or not.
*/

bool AbstractProcessStep::processSucceeded(int exitCode, QProcess::ExitStatus status)
{
    if (d->outputFormatter->hasFatalErrors())
        return false;

    return exitCode == 0 && status == QProcess::NormalExit;
}

void AbstractProcessStep::processReadyReadStdOutput()
{
    if (!d->m_process)
        return;
    stdOutput(d->stdoutStream->toUnicode(d->m_process->readAllStandardOutput()));
}

/*!
    Called for each line of output on stdOut().

    The default implementation adds the line to the application output window.
*/

void AbstractProcessStep::stdOutput(const QString &output)
{
    emit addOutput(output, BuildStep::OutputFormat::Stdout, BuildStep::DontAppendNewline);
}

void AbstractProcessStep::processReadyReadStdError()
{
    if (!d->m_process)
        return;
    stdError(d->stderrStream->toUnicode(d->m_process->readAllStandardError()));
}

/*!
    Called for each line of output on StdErrror().

    The default implementation adds the line to the application output window.
*/

void AbstractProcessStep::stdError(const QString &output)
{
    emit addOutput(output, BuildStep::OutputFormat::Stderr, BuildStep::DontAppendNewline);
}

void AbstractProcessStep::finish(bool success)
{
    emit finished(success);
}

void AbstractProcessStep::outputAdded(const QString &string, BuildStep::OutputFormat format)
{
    emit addOutput(string, format, BuildStep::DontAppendNewline);
}

void AbstractProcessStep::slotProcessFinished(int, QProcess::ExitStatus)
{
    QProcess *process = d->m_process.get();
    if (!process) // Happens when the process was canceled and handed over to the Reaper.
        process = qobject_cast<QProcess *>(sender()); // The process was canceled!
    if (process) {
        stdError(d->stderrStream->toUnicode(process->readAllStandardError()));
        stdOutput(d->stdoutStream->toUnicode(process->readAllStandardOutput()));
    }
    cleanUp(process);
}

} // namespace ProjectExplorer