Get output from stdout when execute a command

qml-executable-stdout.qml

import QtQuick 2.0
import QtQuick.Controls 1.0
import QtQuick.Layouts 1.0
import org.kde.plasma.core 2.0 as PlasmaCore

Item {
    implicitWidth: label.implicitWidth
    implicitHeight: label.implicitHeight

    property string data: "?"

    PlasmaCore.DataSource {
        id: executable
        engine: "executable"
        connectedSources: []
        onNewData: {
            var exitCode = data["exit code"]
            var exitStatus = data["exit status"]
            var stdout = data["stdout"]
            var stderr = data["stderr"]
            exited(exitCode, exitStatus, stdout, stderr)
            disconnectSource(sourceName) // cmd finished
        }
        function exec(cmd) {
            connectSource(cmd)
        }
        signal exited(int exitCode, int exitStatus, string stdout, string stderr)
    }

    Connections {
        target: executable
        onExited: {
            data = stdout.replace('\n', ' ').trim()
        }
    }

    Label {
        id: label
        text: i18n("<b>ls -la\n:</b> %1", data)
    }

    Component.onCompleted: {
        var cmd = 'ls -la'
        executable.exec(cmd)
    }
}