/usr/share/gap/lib/demo.g is in gap-libs 4r7p5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
#W demo.g GAP library Werner Nickel
##
##
## This files contains functions that support running demonstrations with
## Gap.
##
#############################################################################
##
#F Demonstration( <file> ) . . . . . . . . . . run a demonstration from file
##
if not IsBound(last) then
last := fail;
fi;
if not IsBound(last2) then
last2 := fail;
fi;
if not IsBound(last3) then
last3 := fail;
fi;
if not IsBound(time) then
time := fail;
fi;
BindGlobal( "Demonstration", function( file )
local input, keyboard, result, storedtime;
input := InputTextFile( file );
while input = fail do
Error( "Cannot open file ", file );
od;
Print( "\nStart of demonstration.\n\n" );
InputLogTo( "*stdout*" );
keyboard := InputTextUser();
Print( "demo> \c" );
while CHAR_INT( ReadByte( keyboard ) ) <> 'q' do
storedtime := Runtime();
result:=READ_COMMAND( input, true ); # Executing the command.
time := Runtime()-storedtime;
if result <> SuPeRfail then
last3 := last2;
last2 := last;
last := result;
View( result);
Print("\n" );
fi;
if IsEndOfStream( input ) then
break;
fi;
Print( "demo> \c" );
od;
Print( "\nEnd of demonstration.\n\n" );
CloseStream( keyboard );
CloseStream( input );
InputLogTo();
end );
#############################################################################
##
#F ReadVerbose( <file> ) . . . . . . . . . . run a demonstration from file
##
BindGlobal( "ReadVerbose", function( file )
local input,command,exec,result,blank,semic,hash,process,l,view,estream;
input := InputTextFile( file );
while input = fail do
Error( "Cannot open file ", file );
od;
blank:=" \n";
semic:=';';
hash:='#';
exec:="";
process:=function()
local storedtime;
view:=true;
if exec[Length(exec)-1]=semic then
view:=false;
fi;
estream:=InputTextString( exec );
storedtime := Runtime();
result:=READ_COMMAND( estream, true ); # Executing the command.
time := Runtime()-storedtime;
CloseStream(estream);
if result<>SuPeRfail then
last3 := last2;
last2 := last;
last := result;
if view then
View(result);
Print("\n");
fi;
fi;
exec:="";
end;
command := ReadLine( input ); # Executing the command.
while not IsEndOfStream(input) do
if Length(exec)=0 then
Print("gap> ");
else
Print("> ");
fi;
Print(command);
# is there a hash mark anywhere?
l:=1;
while l<=Length(command) and command[l]<>hash do
l:=l+1;
od;
l:=l-1;
# remove trailing blanks
while l>0 and command[l] in blank do
l:=l-1;
od;
Append(exec,command{[1..l]});
if l>0 and command[l]=semic then
process();
fi;
command := ReadLine( input ); # Executing the command.
od;
CloseStream( input );
if Length(exec)>0 then
process();
fi;
end );
#############################################################################
##
#E
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