2022-12-30 Fred Gleason <fredg@paravelsystems.com>

* Added a 'RDLIBRARY.IS_SINGLETON' field to the database.
	* Added a 'RDLOGEDIT.IS_SINGLETON' field to the database.
	* Incremented the database version to 367.
	* Added 'RDLibraryConf::isSingleton()' and
	'RDLibraryConf::setIsSingleton()' methods.
	* Added 'RDLogeditConf::isSingleton()' and
	'RDLogeditConf::setIsSingleton()' methods.
	* Modified rdcartslots(1), rdcastmanager(1), rdcatch(1),
	rdlogmanager(1) and rdpanel(1) to allow only a single instance to
	run at a time.
	* Modified rdlibrary(1) and rdlogedit(1) to conditionally allow
	only a single instance to run at a time.
	* Added an rdsinglestart(1) utility.
	* Added a 'wmctrl' dependency to the 'rivendell' RPM package.

Signed-off-by: Fred Gleason <fredg@paravelsystems.com>

utils/rdsinglestart/rdsinglestart.cpp

@@ -0,0 +1,149 @@
+// rdsinglestart.cpp
+//
+//  Start a program so as to allow only a single instance.
+//
+//   (C) Copyright 2022 Fred Gleason <fredg@paravelsystems.com>
+//
+//   This program is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU General Public License version 2 as
+//   published by the Free Software Foundation.
+//
+//   This program is distributed in the hope that it will be useful,
+//   but WITHOUT ANY WARRANTY; without even the implied warranty of
+//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//   GNU General Public License for more details.
+//
+//   You should have received a copy of the GNU General Public
+//   License along with this program; if not, write to the Free Software
+//   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <QApplication>
+#include <QProcess>
+
+#include "rdsinglestart.h"
+
+MainObject::MainObject(QObject *parent)
+  :QObject(parent)
+{
+  QStringList args;
+  QProcess *proc=NULL;
+
+  //
+  // Read Command Options
+  //
+  RDCmdSwitch *cmd=new RDCmdSwitch("rdsinglestart",RDSINGLESTART_USAGE);
+  if(cmd->keys()<1) {
+    perror("missing argument");
+    exit(1);
+  }
+  for(unsigned i=0;i<(cmd->keys()-1);i++) {
+  }
+  QStringList f0=cmd->key(cmd->keys()-1).split("/",QString::SkipEmptyParts);
+  QString program=f0.last().trimmed();
+
+  //
+  // If we're already running, then just raise the window.
+  //
+  args.clear();
+  args.push_back("-l");
+  proc=new QProcess(this);
+  proc->start("wmctrl",args);
+  proc->waitForFinished();
+  if(proc->exitStatus()!=QProcess::NormalExit) {
+    perror("wmctrl(1) process crashed");
+    exit(1);
+  }
+  if(proc->exitCode()!=0) {
+    QString errs=QString::fromUtf8(proc->readAllStandardError());
+    if(errs.isEmpty()) {
+      fprintf(stderr,"rdsinglestart: wmctrl(1) not found\n");
+    }
+    else {
+      fprintf(stderr,"rdsinglestart: wmctrl(1) process returned error [%s]\n",
+	      errs.toUtf8().constData());
+    }
+    exit(1);
+  }
+  bool found=false;
+  f0=QString::fromUtf8(proc->readAllStandardOutput()).
+    split("\n",QString::SkipEmptyParts);
+  for(int i=0;i<f0.size();i++) {
+    QStringList f1=f0.at(i).split(" ",QString::SkipEmptyParts);
+    if(f1.size()>=4) {
+      if(f1.at(3).trimmed().toLower()==program) {
+	Raise(f1.at(0));
+	found=true;
+      }
+    }
+  }
+  delete proc;
+  if(found) {
+    exit(0);
+  }
+
+  //
+  // Otherwise, start a new process
+  //
+  Start(cmd);
+
+  exit(0);
+}
+
+
+void MainObject::Raise(const QString win_id)
+{
+  QStringList args;
+  QProcess *proc=NULL;
+
+  args.push_back("-i");
+  args.push_back("-R");
+  args.push_back(win_id);
+  proc=new QProcess(this);
+  proc->start("wmctrl",args);
+  proc->waitForFinished();
+  if(proc->exitStatus()!=QProcess::NormalExit) {
+    perror("wmctrl(1) process crashed");
+    exit(1);
+  }
+  if(proc->exitCode()!=0) {
+    QString errs=QString::fromUtf8(proc->readAllStandardError());
+    if(errs.isEmpty()) {
+      fprintf(stderr,"rdsinglestart: wmctrl(1) not found\n");
+    }
+    else {
+      fprintf(stderr,"rdsinglestart: wmctrl(1) process returned error [%s]\n",
+	      errs.toUtf8().constData());
+    }
+    exit(1);
+  }
+  delete proc;
+}
+
+
+void MainObject::Start(RDCmdSwitch *cmd)
+{
+  char *args[cmd->keys()+1];
+  memset(args,0,sizeof(char *)*(cmd->keys()+1));
+
+  for(unsigned i=0;i<cmd->keys();i++) {
+    args[i]=(char *)malloc(cmd->key(i).toUtf8().size()+1);
+    strcpy(args[i],cmd->key(i).toUtf8().constData());
+  }
+  if(fork()==0) {
+    execvp(args[0],args);
+    perror("rdsinglestart");
+  }
+  exit(0);
+}
+
+
+int main(int argc,char *argv[])
+{
+  QApplication a(argc,argv,false);
+  new MainObject();
+  return a.exec();
+}