@hackage vty3.1.0

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.

darcs get --tag=rel-3.0.0 http://code.haskell.org/vty/

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

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