Introduce command line options --norepl and --nointeract, remove IsLIBGAP constant

lib/init.g

@@ -938,16 +938,6 @@ BindGlobal ("ShowSystemInformation", function ()
 end );
 
 
-#############################################################################
-##
-## Initialize the IsLIBGAP variable (if not done before). If this variable
-## is false, an interactive session will be started.
-## Otherwise no interactive session is started.
-##
-if not IsBound( IsLIBGAP ) then
-  BIND_CONSTANT( "IsLIBGAP", false );
-fi;
-
 #############################################################################
 ##
 ##  Finally, deal with the lists of global variables.
@@ -1037,8 +1027,9 @@ InstallAndCallPostRestore( function()
     od;
 end );
 
-if IsLIBGAP then
-  # GAP is used as a library, do not start an interactive session
+
+if GAPInfo.CommandLineOptions.norepl then
+  # do not start an interactive session
 elif IsHPCGAP and THREAD_UI() then
   ReadLib("hpc/consoleui.g");
   MULTI_SESSION();

lib/system.g

@@ -111,7 +111,11 @@ BIND_GLOBAL( "GAPInfo", rec(
            help := [ "Run ProfileLineByLine(<filename>) with recordMem := true on GAP start"] ),
       rec( long := "cover", default := "", arg := "<file>",
            help := [ "Run CoverageLineByLine(<filename>) on GAP start"] ),
-      rec( long := "enableMemCheck", default := false)
+      rec( long := "enableMemCheck", default := false),
+      rec( long := "norepl", default := false,
+           help := [ "Disable the GAP read-evaluate-print loop (REPL)" ] ),
+      rec( long := "nointeract", default := false,
+           help := [ "Start GAP in non-interactive mode (disable read-evaluate-print loop (REPL) and break loop)" ] )
     ],
     ) );
 
@@ -377,6 +381,13 @@ CallAndInstallPostRestore( function()
     CommandLineOptions.g:= CommandLineOptions.g mod 3;
     # use the same as the kernel
     CommandLineOptions.E:= GAPInfo.KernelInfo.HAVE_LIBREADLINE;
+
+    # --nointeract implies no break loop and no repl
+    if CommandLineOptions.nointeract then
+      CommandLineOptions.T := true;
+      CommandLineOptions.norepl := true;
+    fi;
+
     MakeImmutable( CommandLineOptions );
     MakeImmutable( InitFiles );