kmail

editorwatcher.cpp

00001 /*
00002     Copyright (c) 2007 Volker Krause <vkrause@kde.org>
00003 
00004     This program is free software; you can redistribute it and/or modify
00005     it under the terms of the GNU General Public License as published by
00006     the Free Software Foundation; either version 2 of the License, or
00007     (at your option) any later version.
00008 
00009     This program is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
00012     GNU General Public License for more details.
00013 
00014     You should have received a copy of the GNU General Public License
00015     along with this program; if not, write to the Free Software
00016     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00017 */
00018 
00019 #include "editorwatcher.h"
00020 
00021 #include <config.h>
00022 
00023 #include <kdebug.h>
00024 #include <klocale.h>
00025 #include <kmessagebox.h>
00026 #include <kopenwith.h>
00027 #include <kprocess.h>
00028 #include <kuserprofile.h>
00029 
00030 #include <qsocketnotifier.h>
00031 
00032 #include <cassert>
00033 
00034 // inotify stuff taken from kdelibs/kio/kio/kdirwatch.cpp
00035 #ifdef HAVE_INOTIFY
00036 #include <sys/ioctl.h>
00037 #include <unistd.h>
00038 #include <fcntl.h>
00039 #include <sys/syscall.h>
00040 #include <sys/inotify.h>
00041 #endif
00042 
00043 using namespace KMail;
00044 
00045 EditorWatcher::EditorWatcher(const KURL & url, const QString &mimeType, bool openWith, QObject * parent) :
00046     QObject( parent ),
00047     mUrl( url ),
00048     mMimeType( mimeType ),
00049     mOpenWith( openWith ),
00050     mEditor( 0 ),
00051     mHaveInotify( false ),
00052     mFileOpen( false ),
00053     mEditorRunning( false ),
00054     mFileModified( true ), // assume the worst unless we know better
00055     mDone( false )
00056 {
00057   assert( mUrl.isLocalFile() );
00058   connect( &mTimer, SIGNAL(timeout()), SLOT(checkEditDone()) );
00059 }
00060 
00061 bool EditorWatcher::start()
00062 {
00063   // find an editor
00064   KURL::List list;
00065   list.append( mUrl );
00066   KService::Ptr offer = KServiceTypeProfile::preferredService( mMimeType, "Application" );
00067   if ( mOpenWith || !offer ) {
00068     KOpenWithDlg dlg( list, i18n("Edit with:"), QString::null, 0 );
00069     if ( !dlg.exec() )
00070       return false;
00071     offer = dlg.service();
00072     if ( !offer )
00073       return false;
00074   }
00075 
00076 #ifdef HAVE_INOTIFY
00077   // monitor file
00078   mInotifyFd = inotify_init();
00079   if ( mInotifyFd > 0 ) {
00080     mInotifyWatch = inotify_add_watch( mInotifyFd, mUrl.path().latin1(), IN_CLOSE | IN_OPEN | IN_MODIFY );
00081     if ( mInotifyWatch >= 0 ) {
00082       QSocketNotifier *sn = new QSocketNotifier( mInotifyFd, QSocketNotifier::Read, this );
00083       connect( sn, SIGNAL(activated(int)), SLOT(inotifyEvent()) );
00084       mHaveInotify = true;
00085       mFileModified = false;
00086     }
00087   } else {
00088     kdWarning(5006) << k_funcinfo << "Failed to activate INOTIFY!" << endl;
00089   }
00090 #endif
00091 
00092   // start the editor
00093   QStringList params = KRun::processDesktopExec( *offer, list, false );
00094   mEditor = new KProcess( this );
00095   *mEditor << params;
00096   connect( mEditor, SIGNAL(processExited(KProcess*)), SLOT(editorExited()) );
00097   if ( !mEditor->start() )
00098     return false;
00099   mEditorRunning = true;
00100 
00101   mEditTime.start();
00102   return true;
00103 }
00104 
00105 void EditorWatcher::inotifyEvent()
00106 {
00107   assert( mHaveInotify );
00108 #ifdef HAVE_INOTIFY
00109   int pending = -1;
00110   char buffer[4096];
00111   ioctl( mInotifyFd, FIONREAD, &pending );
00112   while ( pending > 0 ) {
00113     int size = read( mInotifyFd, buffer, QMIN( pending, (int)sizeof(buffer) ) );
00114     pending -= size;
00115     if ( size < 0 )
00116       break; // error
00117     int offset = 0;
00118     while ( size > 0 ) {
00119       struct inotify_event *event = (struct inotify_event *) &buffer[offset];
00120       size -= sizeof( struct inotify_event ) + event->len;
00121       offset += sizeof( struct inotify_event ) + event->len;
00122       if ( event->mask & IN_OPEN )
00123         mFileOpen = true;
00124       if ( event->mask & IN_CLOSE )
00125         mFileOpen = false;
00126       if ( event->mask & IN_MODIFY )
00127         mFileModified = true;
00128     }
00129   }
00130 #endif
00131   mTimer.start( 500, true );
00132 
00133 }
00134 
00135 void EditorWatcher::editorExited()
00136 {
00137   mEditorRunning = false;
00138   mTimer.start( 500, true );
00139 }
00140 
00141 void EditorWatcher::checkEditDone()
00142 {
00143   if ( mEditorRunning || (mFileOpen && mHaveInotify) || mDone )
00144     return;
00145   // protect us against double-deletion by calling this method again while
00146   // the subeventloop of the message box is running
00147   mDone = true;
00148   // nobody can edit that fast, we seem to be unable to detect
00149   // when the editor will be closed
00150   if ( mEditTime.elapsed() <= 3000 ) {
00151     KMessageBox::error( 0, i18n("KMail is unable to detect when the choosen editor is closed. "
00152          "To avoid data loss, editing the attachment will be aborted."), i18n("Unable to edit attachment") );
00153   }
00154 
00155   emit editDone( this );
00156   deleteLater();
00157 }
00158 
00159 #include "editorwatcher.moc"
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