System.Console.ANSI.Codes

ansi-terminal-0.11.1: Simple ANSI terminal support, with Windows compatibility

Safe Haskell | Safe
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
- Scrolling the screen
- Select Graphic Rendition mode: colors and other whizzy stuff
- Cursor visibilty changes
- 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.

The module System.Console.ANSI exports functions with the same names as those in this module. On some versions of Windows, the terminal in use may not be ANSI-capable. When that is the case, the same-named functions exported by module System.Console.ANSI return "", for the reasons set out in the documentation of that module.

Consequently, if module System.Console.ANSI is also imported, this module is intended to be imported qualified, to avoid name clashes with those functions. For example:

    import qualified System.Console.ANSI.Codes as 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
- scrollPageUpCode :: Int -> String
- scrollPageDownCode :: Int -> String
- setSGRCode :: [SGR] -> String
- hideCursorCode :: String
- showCursorCode :: String
- setTitleCode :: String -> String
- colorToCode :: Color -> Int
- csi :: [Int] -> String -> String
- sgrToCode :: SGR -> [Int]

# Basic data types

module System.Console.ANSI.Types

# Cursor movement by character

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

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. The function `hGetBufNonBlocking` in module System.IO does not work on Windows. This has been attributed to the lack of non-blocking primatives in the operating system (see the GHC bug report #806 at https://ghc.haskell.org/trac/ghc/ticket/806).

Since: 0.7.1

# Clearing parts of the screen

clearFromCursorToScreenEndCode :: String #

clearFromCursorToScreenBeginningCode :: String #

clearScreenCode :: String #

clearFromCursorToLineEndCode :: String #

clearFromCursorToLineBeginningCode :: String #

clearLineCode :: String #

# Scrolling the screen

scrollPageUpCode #

Arguments

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

scrollPageDownCode #

Arguments

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

# 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 #

# Changing the 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.

setTitleCode #

Arguments

:: String | New Icon Name and Window Title
-> String |

XTerm control sequence to set the Icon Name and Window Title.

# Utilities

colorToCode :: Color -> Int #

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

csi #

Arguments

:: [Int] | 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.

sgrToCode #

Arguments

:: SGR | The SGR aspect
-> [Int] |

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