Add standalone mode to MadGraph7

Reimplement the check_sa.cc file with RAMBO momenta generation, create
the additional mode keyword `standalone_mg7`, make launch work and
activate standalone mode to select the backend and the subdirectory to
build and run, create new export class just for standalone, create new
makefile, that wraps madmatrix.mk and adds standalone-related recipes.

Author: Qubitol

madgraph/interface/madgraph_interface.py

@@ -1453,6 +1453,10 @@ def find_output_type(self, path):
             raise self.InvalidCmd('%s : Not a valid directory' % path)
         if os.path.isfile(pjoin(bin_path,'madevent')):
             return 'madevent'
+        elif os.path.isfile(pjoin(subproc_path, 'madmatrix.mk')):
+            # standalone_mg7 writes SubProcesses/madmatrix.mk explicitly
+            # (the regular mg7 export does not).
+            return 'standalone_mg7'
         elif os.path.isfile(pjoin(card_path, 'run_card.toml')):
             return 'mg7'
         elif os.path.isdir(src_path):
@@ -2990,7 +2994,8 @@ class MadGraphCmd(HelpToCmd, CheckValidForCmd, CompleteForCmd, CmdExtended):
     _v4_export_formats = ['madevent', 'standalone', 'standalone_msP','standalone_msF',
                           'matrix', 'standalone_rw', 'madweight'] 
     _export_formats = _v4_export_formats + ['standalone_cpp', 'pythia8', 'aloha',
-                                            'matchbox_cpp', 'matchbox', 'mg7_v5', 'mg7']
+                                            'matchbox_cpp', 'matchbox', 'mg7_v5', 'mg7',
+                                            'standalone_mg7']
     _set_options = ['group_subprocesses',
                     'ignore_six_quark_processes',
                     'stdout_level',
@@ -3185,7 +3190,7 @@ def setup(self):
 
         self._v4_export_formats = ['madevent', 'standalone','standalone_msP','standalone_msF',
                                    'matrix', 'standalone_rw']
-        self._export_formats = self._v4_export_formats + ['standalone_cpp', 'pythia8', 'mg7_v5', 'mg7']
+        self._export_formats = self._v4_export_formats + ['standalone_cpp', 'pythia8', 'mg7_v5', 'mg7', 'standalone_mg7']
         self._nlo_modes_for_completion = ['all','virt','real']
 
     def do_quit(self, line):
@@ -7598,7 +7603,17 @@ def do_launch(self, line):
         options = options.__dict__
         # args is now MODE PATH
 
-        if args[0].startswith('standalone'):
+        if args[0] == 'standalone_mg7':
+            class ext_program:
+                @staticmethod
+                def run():
+                    os.chdir(args[1])
+                    try:
+                        subprocess.run(os.path.join("bin", "generate_events"))
+                    except KeyboardInterrupt:
+                        pass
+
+        elif args[0].startswith('standalone'):
             if os.path.isfile(os.path.join(os.getcwd(),args[1],'Cards',\
               'MadLoopParams.dat')) and not os.path.isfile(os.path.join(\
               os.getcwd(),args[1],'SubProcesses','check_poles.f')):
@@ -9239,6 +9254,7 @@ def do_output(self, line):
         config['madweight'] =      {'check': True, 'exporter': 'v4',  'output':'Template'}
         config['mg7_v5'] =         {'check': True, 'exporter': 'cpp', 'output': 'Template'}
         config['mg7'] =            {'check': True, 'exporter': 'cpp', 'output': 'Template'}
+        config['standalone_mg7'] = {'check': True, 'exporter': 'cpp', 'output': 'Template'}
 
         if self._export_format == 'plugin':
             options = {'check': self._export_plugin.check, 'exporter':self._export_plugin.exporter, 'output':self._export_plugin.output}

madgraph/iolibs/export_cpp.py

@@ -2853,6 +2853,9 @@ def ExportCPPFactory(cmd, group_subprocesses=False, cmd_options={}):
     elif cformat == 'mg7':
         from madmatrix.output import ProcessExporterMadMatrix
         return ProcessExporterMadMatrix(cmd._export_dir, opt)
+    elif cformat == 'standalone_mg7':
+        from madmatrix.output import ProcessExporterMadMatrixStandalone
+        return ProcessExporterMadMatrixStandalone(cmd._export_dir, opt)
     else:
         return cmd._export_plugin(cmd._export_dir, opt)