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Language	Haskell2010

System.Console.ANSI.Codes

Contents

Basic data types
Cursor movement by character
Cursor movement by line
Directly changing cursor position
Saving, restoring and reporting cursor position
Clearing parts of the screen
Enabling and disabling automatic line wrapping
Scrolling the screen
Using screen buffers
Reporting background or foreground colors
Select Graphic Rendition mode: colors and other whizzy stuff
Cursor visibilty changes
Hyperlinks
Changing the title
Utilities

Description

This module exports functions that return String values containing codes in accordance with the 'ANSI' standards for control character sequences described in the documentation of module System.Console.ANSI.

Synopsis

module System.Console.ANSI.Types
cursorUpCode :: Int -> String
cursorDownCode :: Int -> String
cursorForwardCode :: Int -> String
cursorBackwardCode :: Int -> String
cursorUpLineCode :: Int -> String
cursorDownLineCode :: Int -> String
setCursorColumnCode :: Int -> String
setCursorPositionCode :: Int -> Int -> String
saveCursorCode :: String
restoreCursorCode :: String
reportCursorPositionCode :: String
clearFromCursorToScreenEndCode :: String
clearFromCursorToScreenBeginningCode :: String
clearScreenCode :: String
clearFromCursorToLineEndCode :: String
clearFromCursorToLineBeginningCode :: String
clearLineCode :: String
enableLineWrapCode :: String
disableLineWrapCode :: String
scrollPageUpCode :: Int -> String
scrollPageDownCode :: Int -> String
useAlternateScreenBufferCode :: String
useNormalScreenBufferCode :: String
reportLayerColorCode :: ConsoleLayer -> String
setSGRCode :: [SGR] -> String
hideCursorCode :: String
showCursorCode :: String
hyperlinkCode :: String -> String -> String
hyperlinkWithIdCode :: String -> String -> String -> String
hyperlinkWithParamsCode :: [(String, String)] -> String -> String -> String
setTitleCode :: String -> String
colorToCode :: Color -> Int
type Parameter = Int
type SubParam = Maybe Int
type ParamWithSubs = (Parameter, [SubParam])
csi :: [Parameter] -> String -> String
csi' :: [ParamWithSubs] -> String -> String
osc :: String -> String -> String
sgrToCode :: SGR -> [Parameter]
sgrToCode' :: SGR -> Either ParamWithSubs [Parameter]

Basic data types

module System.Console.ANSI.Types

Cursor movement by character

These functions yield "" when the number is 0 as, on some terminals, a 0 parameter for the underlying 'ANSI' code specifies a default parameter of 1.

cursorUpCode #

Arguments

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

cursorDownCode #

Arguments

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

cursorForwardCode #

Arguments

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

cursorBackwardCode #

Arguments

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

Cursor movement by line

These functions yield the equivalent of setCursorColumnCode 0 when the number is 0 as, on some terminals, a 0 parameter for the underlying 'ANSI' code specifies a default parameter of 1.

cursorUpLineCode #

Arguments

:: Int	Number of lines to move
-> String

cursorDownLineCode #

Arguments

:: Int	Number of lines to move
-> String

Directly changing cursor position

setCursorColumnCode #

Arguments

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

Code to move the cursor to the specified column. The column numbering is 0-based (that is, the left-most column is numbered 0).

setCursorPositionCode #

Arguments

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

Code to move the cursor to the specified position (row and column). The position is 0-based (that is, the top-left corner is at row 0 column 0).

Saving, restoring and reporting cursor position

saveCursorCode :: String #

Since: 0.7.1

restoreCursorCode :: String #

Since: 0.7.1

reportCursorPositionCode :: String #

Code to emit the cursor position into the console input stream, immediately after being recognised on the output stream, as: ESC [ <cursor row> ; <cursor column> R

Note that the information that is emitted is 1-based (the top-left corner is at row 1 column 1) but setCursorPositionCode is 0-based.

In isolation of getReportedCursorPosition or getCursorPosition, this function may be of limited use on Windows operating systems because of difficulties in obtaining the data emitted into the console input stream.

Since: 0.7.1

Clearing parts of the screen

clearFromCursorToScreenEndCode :: String #

clearFromCursorToScreenBeginningCode :: String #

clearScreenCode :: String #

clearFromCursorToLineEndCode :: String #

clearFromCursorToLineBeginningCode :: String #

clearLineCode :: String #

Enabling and disabling automatic line wrapping

These functions control whether or not characters automatically wrap to the next line when the cursor reaches the right border.

enableLineWrapCode :: String #

disableLineWrapCode :: String #

Scrolling the screen

These functions yield "" when the number is 0 as, on some terminals, a 0 parameter for the underlying 'ANSI' code specifies a default parameter of 1.

scrollPageUpCode #

Arguments

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

scrollPageDownCode #

Arguments

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

Using screen buffers

useAlternateScreenBufferCode :: String #

useNormalScreenBufferCode :: String #

Reporting background or foreground colors

reportLayerColorCode :: ConsoleLayer -> String #

Code to emit the foreground or backgrond layer color into the console input stream, immediately after being recognised on the output stream, as:

ESC ] <Ps> ; rgb: <red> ; <green> ; <blue> <ST>

where <Ps> is 10 for Foreground and 11 for Background; <red>, <green> and <blue> are the color channel values in hexadecimal (4, 8, 12 and 16 bit values are possible, although 16 bit values are most common); and <ST> is the STRING TERMINATOR (ST). ST depends on the terminal software and may be the BEL character or ESC \ characters.

This function may be of limited, or no, use on Windows operating systems because (1) the control character sequence is not supported on native terminals (2) of difficulties in obtaining the data emitted into the console input stream. See getReportedLayerColor.

Underlining is not supported.

Since: 0.11.4

Select Graphic Rendition mode: colors and other whizzy stuff

setSGRCode #

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

Cursor visibilty changes

hideCursorCode :: String #

showCursorCode :: String #

Hyperlinks

Some, but not all, terminals support hyperlinks - that is, clickable text that points to a URI.

hyperlinkCode #

Arguments

:: String	URI
-> String	Link text
-> String

Code to introduce a hyperlink.

Since: 0.11.3

hyperlinkWithIdCode #

Arguments

:: String	Identifier for the link
-> String	URI
-> String	Link text
-> String

Code to introduce a hyperlink with an identifier for the link. Some terminals support an identifier, so that hyperlinks with the same identifier are treated as connected.

Since: 0.11.3

hyperlinkWithParamsCode #

Arguments

:: [(String, String)]	Parameters
-> String	URI
-> String	Link text
-> String

Code to introduce a hyperlink with (key, value) parameters. Some terminals support an id parameter key, so that hyperlinks with the same id value are treated as connected.

Since: 0.11.3

Changing the title

setTitleCode #

Arguments

:: String	New window title and icon name
-> String

Code to set the terminal window title and the icon name (that is, the text for the window in the Start bar, or similar).

Utilities

colorToCode :: Color -> Int #

colorToCode color returns the 0-based index of the color (one of the eight colors in the ANSI standard).

type Parameter = Int #

Type synonym representing parameter values (without parameter substrings). To represent a paramater value followed by a parameter substring, see ParamWithSubs.

Since: 1.1

type SubParam = Maybe Int #

Type synonym representing parameter elements of a parameter substring. An empty parameter element (which represents a default value for the parameter element) has value Nothing.

Since: 1.1

type ParamWithSubs = (Parameter, [SubParam]) #

Type synonym representing parameter values optionally followed by a parameter substring. Parameter substrings were introduced by 13.1.8 of T.416 (03/93) for SGR parameter values 38 and 48 and have subsequently been adapted for other uses.

Since: 1.1

csi #

Arguments

:: [Parameter]	List of parameters for the control sequence.
-> String	Character(s) that identify the control function.
-> String

csi parameters controlFunction, where parameters is a list of Int, returns the control sequence comprising the control function CONTROL SEQUENCE INTRODUCER (CSI) followed by the parameter(s) (separated by ';') and ending with the controlFunction character(s) that identifies the control function. See csi' for a function that handles parameter values that may be followed by a parameter substring.

csi' #

Arguments

:: [ParamWithSubs]	List of parameters (each of which may be followed by a parameter substring).
-> String	Characters(s) that identify the control function.
-> String

Like csi but extended to parameters that may be followed by a parameter substring. The parameter elements of a parameter substring are separated from the parameter value and each other by ':'.

Since: 1.1

osc #

Arguments

:: String	Ps parameter
-> String	Pt parameter(s)
-> String

osc parameterS parametersT, where parameterS specifies the type of operation to perform and parametersT is the other parameter(s) (if any), returns the control sequence comprising the control function OPERATING SYSTEM COMMAND (OSC) followed by the parameters (separated by ';') and ending with the STRING TERMINATOR (ST) "\ESC\\".

Since: 0.11.4

sgrToCode #

Arguments

:: SGR	The SGR aspect
-> [Parameter]

sgrToCode sgr returns the parameter of the SELECT GRAPHIC RENDITION (SGR) aspect identified by sgr. If the parameter is followed by a parameter substring returns an empty list. See sgrToCode' for a function that handles also parameter values that are followed by a parameter substring.

sgrToCode' #

Arguments

:: SGR	The SGR aspect
-> Either ParamWithSubs [Parameter]

sgrToCode' sgr returns the parameter of the SELECT GRAPHIC RENDITION (SGR) aspect identified by sgr.

Since: 1.1