With Strawberry Perl 5.26.2 (Windows 7) I got some complaints about unknown terminal window size when starting the debugger. 
Unable to get Terminal Size. The Win32 GetConsoleScreenBufferInfo call
+ didn't work. The COLUMNS and LINES environment variables didn't work
+. at C:/Strawberry/perl/vendor/lib/Term/ReadLine/readline.pm line 410
+.

[download]

These lines in sub afterinit take care of it: 
    my ($cols, $lines) = split ' ', (grep { m{^\s*\d+\s+\d+\s}xms } `p
+owershell -command "&{\$H=get-host;\$H.ui.rawui.WindowSize;}"`)[0];
    $ENV{'COLUMNS'} = $cols;
    $ENV{'LINES'} = $lines;
    print "COLUMNS and LINES are set ($cols,$lines).\n";

[download]

Powershell is used here to get the console property WindowSize. Then the environment variables COLUMNS and LINES are locally set and the readline.pm module is happy.

In reply to Re^5: Debugging a program by hexcoder
in thread Debugging a program by leonidlm

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