Safe Haskell	Safe-Infered

System.Console.ANSI

Contents

Basic data types
Cursor movement by character
Cursor movement by line
Directly changing cursor position
Clearing parts of the screen
Scrolling the screen
Select Graphic Rendition mode: colors and other whizzy stuff
Cursor visibilty changes
Changing the title

Description

Provides ANSI terminal support for Windows and ANSI terminal software running on a Unix-like operating system.

The ANSI escape codes are described at http://en.wikipedia.org/wiki/ANSI_escape_code and provide a rich range of functionality for terminal control, which includes:

Colored text output, with control over both foreground and background colors
Hiding or showing the cursor
Moving the cursor around
Clearing parts of the screen

The most frequently used parts of this ANSI command set are exposed with a platform independent interface by this module. Every function exported comes in three flavours:

Vanilla: has an IO () type and doesn't take a Handle. This just outputs the ANSI command directly on to the terminal corresponding to stdout. Commands issued like this should work as you expect on both Windows and Unix.
Chocolate: has an IO () type but takes a Handle. This outputs the ANSI command on the terminal corresponding to the supplied handle. Commands issued like this should also work as your expect on both Windows and Unix.
Strawberry: has a String type and just consists of an escape code which can be added to any other bit of text before being output. This version of the API is often convenient to use, but due to fundamental limitations in Windows ANSI terminal support will only work on Unix. On Windows these codes will always be the empty string, so it is possible to use them portably for e.g. coloring console output on the understanding that you will only see colors if you are running on a Unix-like operating system.

Synopsis

Basic data types

data Color Source

ANSI colors: come in various intensities, which are controlled by ColorIntensity

Constructors

Black
Red
Green
Yellow
Blue
Magenta
Cyan
White

Instances

Bounded Color
Enum Color
Show Color

data ColorIntensity Source

ANSI colors come in two intensities

Constructors

Dull
Vivid

Instances

Enum ColorIntensity
Show ColorIntensity

data ConsoleLayer Source

ANSI colors can be set on two different layers

Constructors

Foreground
Background

Instances

Enum ConsoleLayer
Show ConsoleLayer

data BlinkSpeed Source

ANSI blink speeds: values other than NoBlink are not widely supported

Constructors

SlowBlink	Less than 150 blinks per minute
RapidBlink	More than 150 blinks per minute
NoBlink

data Underlining Source

ANSI text underlining

Constructors

SingleUnderline
DoubleUnderline	Not widely supported
NoUnderline

data ConsoleIntensity Source

ANSI general console intensity: usually treated as setting the font style (e.g. BoldIntensity causes text to be bold)

Constructors

BoldIntensity
FaintIntensity	Not widely supported: sometimes treated as concealing text
NormalIntensity

data SGR Source

ANSI Select Graphic Rendition command

Constructors

Reset
SetConsoleIntensity ConsoleIntensity
SetItalicized Bool	Not widely supported: sometimes treated as swapping foreground and background
SetUnderlining Underlining
SetBlinkSpeed BlinkSpeed
SetVisible Bool	Not widely supported
SetSwapForegroundBackground Bool
SetColor ConsoleLayer ColorIntensity Color

Cursor movement by character

cursorUp,cursorBackward,cursorForward,cursorDown Source

Arguments

:: Int	Number of lines or characters to move
-> IO ()

hCursorUp,hCursorBackward,hCursorForward,hCursorDown Source

Arguments

:: Handle
-> Int	Number of lines or characters to move
-> IO ()

cursorUpCode,cursorBackwardCode,cursorForwardCode,cursorDownCode Source

Arguments

:: Int	Number of lines or characters to move
-> String

Cursor movement by line

cursorDownLine,cursorUpLine Source

Arguments

:: Int	Number of lines to move
-> IO ()

hCursorDownLine,hCursorUpLine Source

Arguments

:: Handle
-> Int	Number of lines to move
-> IO ()

cursorDownLineCode,cursorUpLineCode Source

Arguments

:: Int	Number of lines to move
-> String

Directly changing cursor position

setCursorColumn Source

Arguments

:: Int	0-based column to move to
-> IO ()

hSetCursorColumn Source

Arguments

:: Handle
-> Int	0-based column to move to
-> IO ()

setCursorColumnCode Source

Arguments

:: Int	0-based column to move to
-> String

setCursorPosition Source

Arguments

:: Int	0-based row to move to
-> Int	0-based column to move to
-> IO ()

hSetCursorPosition Source

Arguments

:: Handle
-> Int	0-based row to move to
-> Int	0-based column to move to
-> IO ()

setCursorPositionCode Source

Arguments

:: Int	0-based row to move to
-> Int	0-based column to move to
-> String

Clearing parts of the screen

clearFromCursorToScreenEnd, clearScreen, clearFromCursorToScreenBeginning :: IO ()Source

hClearFromCursorToScreenEnd, hClearScreen, hClearFromCursorToScreenBeginning :: Handle -> IO ()Source

clearFromCursorToScreenEndCode, clearScreenCode, clearFromCursorToScreenBeginningCode :: String Source

clearFromCursorToLineEnd, clearLine, clearFromCursorToLineBeginning :: IO ()Source

hClearFromCursorToLineEnd, hClearLine, hClearFromCursorToLineBeginning :: Handle -> IO ()Source

clearFromCursorToLineEndCode, clearLineCode, clearFromCursorToLineBeginningCode :: String Source

Scrolling the screen

scrollPageUp,scrollPageDown Source

Arguments

:: Int	Number of lines to scroll by
-> IO ()

Scroll the displayed information up or down the terminal: not widely supported

hScrollPageUp,hScrollPageDown Source

Arguments

:: Handle
-> Int	Number of lines to scroll by
-> IO ()

Scroll the displayed information up or down the terminal: not widely supported

scrollPageUpCode,scrollPageDownCode Source

Arguments

:: Int	Number of lines to scroll by
-> String

Scroll the displayed information up or down the terminal: not widely supported

Select Graphic Rendition mode: colors and other whizzy stuff

setSGR Source

Arguments

:: [SGR]	Commands: these will typically be applied on top of the current console SGR mode. An empty list of commands is equivalent to the list `[Reset]`. Commands are applied left to right.
-> IO ()

Set the Select Graphic Rendition mode

hSetSGR Source

Arguments

:: Handle
-> [SGR]	Commands: these will typically be applied on top of the current console SGR mode. An empty list of commands is equivalent to the list `[Reset]`. Commands are applied left to right.
-> IO ()

Set the Select Graphic Rendition mode

setSGRCode Source

Arguments

:: [SGR]	Commands: these will typically be applied on top of the current console SGR mode. An empty list of commands is equivalent to the list `[Reset]`. Commands are applied left to right.
-> String

Set the Select Graphic Rendition mode

Cursor visibilty changes

hideCursor, showCursor :: IO ()Source

hHideCursor, hShowCursor :: Handle -> IO ()Source

hideCursorCode, showCursorCode :: String Source

Changing the title

setTitle Source

Arguments

:: String	New title
-> IO ()

Set the terminal window title

hSetTitle Source

Arguments

:: Handle
-> String	New title
-> IO ()

Set the terminal window title

setTitleCode Source

Arguments

:: String	New title
-> String

Set the terminal window title

Thanks to Brandon S. Allbery and Curt Sampson for pointing me in the right direction on xterm title setting on haskell-cafe. The 0 signifies that both the title and icon text should be set: i.e. the text for the window in the Start bar (or similar) as well as that in the actual window title. This is chosen for consistent behaviour between Unixes and Windows.