VT100 support

[thejpster]

We should add proper VT100 / ANSI code support

[thejpster]

I did some testing with a basic C program to see how various non-alphanumeric inputs are encoded:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char** argv)
{
    system( "/bin/stty raw" );
    while ( 1 ) {
        int input = getc( stdin );
                printf( "Read %d (0x%02x)\r\n", input, input );
        if ( ( input == 3 ) || ( input == EOF ) ) {
            break;
        }
    }
    system( "/bin/stty cooked" );
    return 0;
}

Results (two bytes is a hex byte, single char is ASCII, ESC is 0x1B):

Key	Bytes	Interpretation
Up Arrow	ESC [ A	CSI A / Cursor Up 1
Down Arrow	ESC [ B	CSI B / Cursor Down 1
Right Arrow	ESC [ C	CSI C / Cursor Forward 1
Left Arrow	ESC [ D	CSI D / Cursor Back 1
Home	ESC [ H	CSI H / Cursor Position 1, 1
End	ESC [ F	CSI F / Cursor Previous Line 1
Escape	ESC
Page Up	ESC [ 5 ~	CSI 5 ~
Page Down	ESC [ 6 ~	CSI 6 ~
Insert	ESC [ 2 ~	CSI 2 ~
Delete	ESC [ 3 ~	CSI 3 ~
Backspace	7f	DEL
Print Screen	Interpreted by GNOME Desktop
Pause	Ignored
Break	Ignored
Sys Req	Did a print-screen
F1	ESC O P	SS3 P
F2	ESC O Q	SS3 Q
F3	ESC O R	SS3 R
F4	ESC O S	SS3 S
F5	ESC [ 1 5 ~	CSI 1 5 ~
F6	ESC [ 1 7 ~	CSI 1 7 ~
F7	ESC [ 1 8 ~	CSI 1 8 ~
F8	ESC [ 1 9 ~	CSI 1 9 ~
F9	ESC [ 2 0 ~	CSI 2 0 ~
F10	No effect
F11	Made window full-screen
F12	ESC [ 2 4 ~	CSI 2 4 ~
Control A	01	SOH
Control B	02	STX
Control M	0d	CR
Control Z	1a	EM
Enter	0d	CR