System.Console.ANSI

ansi-terminal-0.6.3.1: Simple ANSI terminal support, with Windows compatibility

Safe Haskell | Safe
Language | Haskell98

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
- Checking if handle supports ANSI

Description

Provides ANSI terminal support for ANSI terminal software running on a Unix-like operating system or on a Windows operating system (where supported) or on other Windows operating systems where the terminal in use is not ANSI-enabled.

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 you 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 will not work on Windows operating systems where the terminal in use is not ANSI-enabled (such as those before Windows 10 Threshold 2). On versions of Windows where the terminal in use is not ANSI-enabled, 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 an operating system that is Unix-like or is a version of Windows where the terminal in use is ANSI- enabled.

Example:

    -- Set colors and write some text in those colors.
    sgrExample :: IO ()
    sgrExample = do
        setSGR [SetColor Foreground Vivid Red]
        setSGR [SetColor Background Vivid Blue]
        putStr "Red-On-Blue"
        setSGR [Reset]
        putStr "White-On-Black"

For many more examples, see the project's extensive Example.hs file.

Synopsis

- module System.Console.ANSI.Types
- cursorUp :: Int -> IO ()
- cursorDown :: Int -> IO ()
- cursorForward :: Int -> IO ()
- cursorBackward :: Int -> IO ()
- hCursorUp :: Handle -> Int -> IO ()
- hCursorDown :: Handle -> Int -> IO ()
- hCursorForward :: Handle -> Int -> IO ()
- hCursorBackward :: Handle -> Int -> IO ()
- cursorUpCode :: Int -> String
- cursorDownCode :: Int -> String
- cursorForwardCode :: Int -> String
- cursorBackwardCode :: Int -> String
- cursorUpLine :: Int -> IO ()
- cursorDownLine :: Int -> IO ()
- hCursorUpLine :: Handle -> Int -> IO ()
- hCursorDownLine :: Handle -> Int -> IO ()
- cursorUpLineCode :: Int -> String
- cursorDownLineCode :: Int -> String
- setCursorColumn :: Int -> IO ()
- hSetCursorColumn :: Handle -> Int -> IO ()
- setCursorColumnCode :: Int -> String
- setCursorPosition :: Int -> Int -> IO ()
- hSetCursorPosition :: Handle -> Int -> Int -> IO ()
- setCursorPositionCode :: Int -> Int -> String
- clearFromCursorToScreenEnd :: IO ()
- clearFromCursorToScreenBeginning :: IO ()
- clearScreen :: IO ()
- hClearFromCursorToScreenEnd :: Handle -> IO ()
- hClearFromCursorToScreenBeginning :: Handle -> IO ()
- hClearScreen :: Handle -> IO ()
- clearFromCursorToScreenEndCode :: String
- clearFromCursorToScreenBeginningCode :: String
- clearScreenCode :: String
- clearFromCursorToLineEnd :: IO ()
- clearFromCursorToLineBeginning :: IO ()
- clearLine :: IO ()
- hClearFromCursorToLineEnd :: Handle -> IO ()
- hClearFromCursorToLineBeginning :: Handle -> IO ()
- hClearLine :: Handle -> IO ()
- clearFromCursorToLineEndCode :: String
- clearFromCursorToLineBeginningCode :: String
- clearLineCode :: String
- scrollPageUp :: Int -> IO ()
- scrollPageDown :: Int -> IO ()
- hScrollPageUp :: Handle -> Int -> IO ()
- hScrollPageDown :: Handle -> Int -> IO ()
- scrollPageUpCode :: Int -> String
- scrollPageDownCode :: Int -> String
- setSGR :: [SGR] -> IO ()
- hSetSGR :: Handle -> [SGR] -> IO ()
- setSGRCode :: [SGR] -> String
- hideCursor :: IO ()
- showCursor :: IO ()
- hHideCursor :: Handle -> IO ()
- hShowCursor :: Handle -> IO ()
- hideCursorCode :: String
- showCursorCode :: String
- setTitle :: String -> IO ()
- hSetTitle :: Handle -> String -> IO ()
- setTitleCode :: String -> String
- hSupportsANSI :: Handle -> IO Bool

# Basic data types

module System.Console.ANSI.Types

# Cursor movement by character

cursorUp #

Arguments

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

cursorDown #

Arguments

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

cursorForward #

Arguments

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

cursorBackward #

Arguments

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

hCursorUp #

Arguments

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

hCursorDown #

Arguments

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

hCursorForward #

Arguments

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

hCursorBackward #

Arguments

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

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

The difference between movements "by character" and "by line" is that `*Line` functions additionally move the cursor to the start of the line, while functions like `cursorUp` and `cursorDown` keep the column the same.

Also keep in mind that `*Line` functions are not as portable. See https://github.com/feuerbach/ansi-terminal/issues/10 for the details.

cursorUpLine #

Arguments

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

cursorDownLine #

Arguments

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

hCursorUpLine #

Arguments

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

hCursorDownLine #

Arguments

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

cursorUpLineCode #

Arguments

:: Int | Number of lines to move
-> String |

cursorDownLineCode #

Arguments

:: Int | Number of lines to move
-> String |

# Directly changing cursor position

setCursorColumn #

Arguments

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

hSetCursorColumn #

Arguments

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

setCursorColumnCode #

Arguments

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

setCursorPosition #

Arguments

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

hSetCursorPosition #

Arguments

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

setCursorPositionCode #

Arguments

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

# Clearing parts of the screen

Note that these functions only clear parts of the screen. They do not move the cursor.

clearFromCursorToScreenEnd :: IO () #

clearFromCursorToScreenBeginning :: IO () #

clearScreen :: IO () #

hClearFromCursorToScreenEnd :: Handle -> IO () #

hClearFromCursorToScreenBeginning :: Handle -> IO () #

hClearScreen :: Handle -> IO () #

clearFromCursorToScreenEndCode :: String #

clearFromCursorToScreenBeginningCode :: String #

clearScreenCode :: String #

clearFromCursorToLineEnd :: IO () #

clearFromCursorToLineBeginning :: IO () #

clearLine :: IO () #

hClearFromCursorToLineEnd :: Handle -> IO () #

hClearFromCursorToLineBeginning :: Handle -> IO () #

hClearLine :: Handle -> IO () #

clearFromCursorToLineEndCode :: String #

clearFromCursorToLineBeginningCode :: String #

clearLineCode :: String #

# Scrolling the screen

scrollPageUp #

Arguments

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

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

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

scrollPageDown #

Arguments

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

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

hScrollPageUp #

Arguments

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

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

hScrollPageDown #

Arguments

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

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

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

setSGR #

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

Set the Select Graphic Rendition mode

hSetSGR #

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 #

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

hideCursor :: IO () #

showCursor :: IO () #

hHideCursor :: Handle -> IO () #

hShowCursor :: Handle -> IO () #

hideCursorCode :: String #

showCursorCode :: String #

# Changing the title

setTitle #

Arguments

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

Set the terminal window title

hSetTitle #

Arguments

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

Set the terminal window title

setTitleCode #

Arguments

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

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

# Checking if handle supports ANSI

hSupportsANSI :: Handle -> IO Bool #

Use heuristics to determine whether the functions defined in this package will work with a given handle.

The current implementation checks that the handle is a terminal, and that the `TERM` environment variable doesn't say `dumb` (which is what Emacs sets for its own terminal).