@hackage vty3.0.1

A simple terminal access library

vty is a very simple terminal interface library.

Vty currently provides:

Automatic handling of suspend/resume (SIGTSTP+SIGCONT).
Automatic handling of window resizes.
Supports Unicode characters on output, automatically setting and resetting UTF-8 mode (beware double width and combining characters!)
Automatic computation of minimal differences.
Minimizes repaint area, thus virtually eliminating the flicker problem that plagues ncurses programs.
A pure, compositional interface for efficiently constructing display images.
Automatically decodes keyboard keys into (key,[modifier]) tuples.
Automatically supports refresh on Ctrl-L.
Automatically supports timeout after 50ms for lone ESC (a barely noticable delay)
Interface is designed for relatively easy compatible extension.
Supports all ANSI SGR-modes (defined in console_codes(4)) with a simple type-safe interface.
Properly handles cleanup, leaving the cursor at the bottom of the screen and erasing the last line.

Current disadvantages:

No current support for non-ANSI terminals.
UTF-8 support only works properly on the linux console/xterm, and even then only if it is not the system default.
Minimal support for special keys on terminals other than the linux-console. (F1-5 and arrow keys should work, but anything shifted isn't likely to.)
Uses the TIOCGWINSZ ioctl to find the current window size, which appears to be limited to Linux and *BSD.

To compile the demonstration program: ghc --make Test.hs gwinsz.c

The main documentation consists of the haddock-comments and the demonstration program