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** Copyright (C) 2016 The Qt Company Ltd.
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** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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#include "processparameters.h"

#include <utils/fileutils.h>
#include <utils/macroexpander.h>
#include <utils/qtcprocess.h>

#include <QDir>

/*!
    \class ProjectExplorer::ProcessParameters

    \brief The ProcessParameters class aggregates all parameters needed to start
    a process.

    It offers a set of functions which expand macros and environment variables
    inside the raw parameters to obtain final values for starting a process
    or for display purposes.

    \sa ProjectExplorer::AbstractProcessStep
*/

using namespace Utils;

namespace ProjectExplorer {

ProcessParameters::ProcessParameters() :
    m_macroExpander(nullptr),
    m_commandMissing(false)
{
}

/*!
    Sets the command to run.
*/
void ProcessParameters::setCommandLine(const CommandLine &cmdLine)
{
    m_command = cmdLine;
    m_effectiveCommand.clear();
    m_effectiveArguments.clear();
    resolveAll();
}


/*!
    Sets the \a workingDirectory for the process for a build configuration.

    Should be called from init().
*/

void ProcessParameters::setWorkingDirectory(const FilePath &workingDirectory)
{
    m_workingDirectory = workingDirectory;
    m_effectiveWorkingDirectory.clear();
}

/*!
    \fn void ProjectExplorer::ProcessParameters::setEnvironment(const Utils::Environment &env)
    Sets the environment \a env for running the command.

    Should be called from init().
*/

/*!
   \fn  void ProjectExplorer::ProcessParameters::setMacroExpander(Utils::MacroExpander *mx)
   Sets the macro expander \a mx to use on the command, arguments, and working
   dir.

   \note The caller retains ownership of the object.
*/

/*!
    Gets the fully expanded working directory.
*/

FilePath ProcessParameters::effectiveWorkingDirectory() const
{
    if (m_effectiveWorkingDirectory.isEmpty()) {
        QString wds = m_workingDirectory.toString();
        if (m_macroExpander)
            wds = m_macroExpander->expand(wds);
        m_effectiveWorkingDirectory
                = FilePath::fromString(QDir::cleanPath(m_environment.expandVariables(wds)));
    }
    return m_effectiveWorkingDirectory;
}

/*!
    Gets the fully expanded command name to run.
*/

FilePath ProcessParameters::effectiveCommand() const
{
    if (m_effectiveCommand.isEmpty()) {
        FilePath cmd = m_command.executable();
        if (m_macroExpander)
            cmd = m_macroExpander->expand(cmd);
        m_effectiveCommand =
                m_environment.searchInPath(cmd.toString(),
                    {effectiveWorkingDirectory()});
        m_commandMissing = m_effectiveCommand.isEmpty();
        if (m_commandMissing)
            m_effectiveCommand = cmd;
    }
    return m_effectiveCommand;
}

/*!
    Returns \c true if effectiveCommand() would return only a fallback.
*/

bool ProcessParameters::commandMissing() const
{
    effectiveCommand();
    return m_commandMissing;
}

QString ProcessParameters::effectiveArguments() const
{
    if (m_effectiveArguments.isEmpty()) {
        m_effectiveArguments = m_command.arguments();
        if (m_macroExpander)
            m_effectiveArguments = m_macroExpander->expand(m_effectiveArguments);
    }
    return m_effectiveArguments;
}

QString ProcessParameters::prettyCommand() const
{
    QString cmd = m_command.executable().toString();
    if (m_macroExpander)
        cmd = m_macroExpander->expand(cmd);
    return Utils::FilePath::fromString(cmd).fileName();
}

QString ProcessParameters::prettyArguments() const
{
    QString margs = effectiveArguments();
    QString workDir = effectiveWorkingDirectory().toString();
    Utils::QtcProcess::SplitError err;
    Utils::QtcProcess::Arguments args =
            Utils::QtcProcess::prepareArgs(margs, &err, Utils::HostOsInfo::hostOs(), &m_environment, &workDir);
    if (err != Utils::QtcProcess::SplitOk)
        return margs; // Sorry, too complex - just fall back.
    return args.toString();
}

QString ProcessParameters::summary(const QString &displayName) const
{
    return QString::fromLatin1("<b>%1:</b> %2 %3")
            .arg(displayName,
                 Utils::QtcProcess::quoteArg(prettyCommand()),
                 prettyArguments());
}

QString ProcessParameters::summaryInWorkdir(const QString &displayName) const
{
    return QString::fromLatin1("<b>%1:</b> %2 %3 in %4")
            .arg(displayName,
                 Utils::QtcProcess::quoteArg(prettyCommand()),
                 prettyArguments(),
                 QDir::toNativeSeparators(effectiveWorkingDirectory().toString()));
}

void ProcessParameters::resolveAll()
{
    effectiveCommand();
    effectiveArguments();
    effectiveWorkingDirectory();
}

} // ProcessExplorer
