vty-5.20: A simple terminal UI library

Safe HaskellSafe
LanguageHaskell2010

Graphics.Vty.Config

Description

Vty supports a configuration file format and associated Config data type. The Config can be provided to mkVty to customize the application's use of Vty.

Lines in config files that fail to parse are ignored. Later entries take precedence over earlier ones.

Debug

debugLog

Format:

 "debugLog" string

The value of the environment variable VTY_DEBUG_LOG is equivalent to a debugLog entry at the end of the last config file.

Input Processing

map

Format:

 "map" term string key modifier_list
 where
     key := KEsc | KChar Char | KBS ... (same as Key)
     modifier_list := "[" modifier+ "]"
     modifier := MShift | MCtrl | MMeta | MAlt
     term := "_" | string

E.g., if the contents are

 map _       "\ESC[B"    KUp   []
 map _       "\ESC[1;3B" KDown [MAlt]
 map "xterm" "\ESC[D"    KLeft []

Then the bytes "\ESC[B" will result in the KUp event on all terminals. The bytes "\ESC[1;3B" will result in the event KDown with the MAlt modifier on all terminals. The bytes "\ESC[D" will result in the KLeft event when TERM is xterm.

If a debug log is requested then vty will output the current input table to the log in the above format. A workflow for using this is to set VTY_DEBUG_LOG. Run the application. Check the debug log for incorrect mappings. Add corrected mappings to $HOME.vtyconfig.

Synopsis

Documentation

type InputMap = [(Maybe String, String, Event)] Source #

Mappings from input bytes to event in the order specified. Later entries take precedence over earlier in the case multiple entries have the same byte string.

data Config Source #

A Vty configuration.

Constructors

Config 

Fields

userConfig :: IO Config Source #

Load a configuration from getAppUserDataDirectory/config and $VTY_CONFIG_FILE.

standardIOConfig :: IO Config Source #

Configures VTY using defaults suitable for terminals. This function can raise VtyConfigurationError.