xmonad-contrib-0.11.1: Third party extensions for xmonad

Portability | unportable
Stability | unstable
Maintainer | Don Stewart <dons@cse.unsw.edu.au>
Safe Haskell | None

XMonad.Hooks.DynamicLog

Contents

- Usage
- Drop-in loggers
- Build your own formatter
- Example formatters
- Formatting utilities
- Internal formatting functions
- To Do

Description

xmonad calls the logHook with every internal state update, which is useful for (among other things) outputting status information to an external status bar program such as xmobar or dzen. DynamicLog provides several drop-in logHooks for this purpose, as well as flexible tools for specifying your own formatting.

Synopsis

- dzen :: LayoutClass l Window => XConfig l -> IO (XConfig (ModifiedLayout AvoidStruts l))
- xmobar :: LayoutClass l Window => XConfig l -> IO (XConfig (ModifiedLayout AvoidStruts l))
- statusBar :: LayoutClass l Window => String -> PP -> (XConfig Layout -> (KeyMask, KeySym)) -> XConfig l -> IO (XConfig (ModifiedLayout AvoidStruts l))
- dynamicLog :: X ()
- dynamicLogXinerama :: X ()
- xmonadPropLog' :: String -> String -> X ()
- xmonadPropLog :: String -> X ()
- dynamicLogWithPP :: PP -> X ()
- dynamicLogString :: PP -> X String
- data PP = PP {
  - ppCurrent :: WorkspaceId -> String
  - ppVisible :: WorkspaceId -> String
  - ppHidden :: WorkspaceId -> String
  - ppHiddenNoWindows :: WorkspaceId -> String
  - ppUrgent :: WorkspaceId -> String
  - ppSep :: String
  - ppWsSep :: String
  - ppTitle :: String -> String
  - ppLayout :: String -> String
  - ppOrder :: [String] -> [String]
  - ppSort :: X ([WindowSpace] -> [WindowSpace])
  - ppExtras :: [X (Maybe String)]
  - ppOutput :: String -> IO ()
  }
- defaultPP :: PP
- dzenPP :: PP
- xmobarPP :: PP
- sjanssenPP :: PP
- byorgeyPP :: PP
- wrap :: String -> String -> String -> String
- pad :: String -> String
- trim :: String -> String
- shorten :: Int -> String -> String
- xmobarColor :: String -> String -> String -> String
- xmobarStrip :: String -> String
- dzenColor :: String -> String -> String -> String
- dzenEscape :: String -> String
- dzenStrip :: String -> String
- pprWindowSet :: WorkspaceSort -> [Window] -> PP -> WindowSet -> String
- pprWindowSetXinerama :: WindowSet -> String

# Usage

You can use this module with the following in your `~/.xmonad/xmonad.hs`:

        import XMonad
        import XMonad.Hooks.DynamicLog

If you just want a quick-and-dirty status bar with zero effort, try the `xmobar` or `dzen` functions:

     main = xmonad =<< xmobar myConfig

     myConfig = defaultConfig { ... }

There is also `statusBar` if you'd like to use another status bar, or would like to use different formatting options. The `xmobar`, `dzen`, and `statusBar` functions are preferred over the other options listed below, as they take care of all the necessary plumbing -- no shell scripting required!

Alternatively, you can choose among several default status bar formats (`dynamicLog` or `dynamicLogXinerama`) by simply setting your logHook to the appropriate function, for instance:

     main = xmonad $ defaultConfig {
        ...
        logHook = dynamicLog
        ...
      }

For more flexibility, you can also use `dynamicLogWithPP` and supply your own pretty-printing format (by either defining one from scratch, or customizing one of the provided examples). For example:

        -- use sjanssen's pretty-printer format, but with the sections
        -- in reverse
        logHook = dynamicLogWithPP $ sjanssenPP { ppOrder = reverse }

Note that setting the `logHook` only sets up xmonad's output; you are responsible for starting your own status bar program (e.g. dzen or xmobar) and making sure xmonad's output is piped into it appropriately, either by putting it in your `.xsession` or similar file, or by using `spawnPipe` in your `main` function, for example:

     import XMonad.Util.Run   -- for spawnPipe and hPutStrLn

     main = do
         h <- spawnPipe "xmobar -options -foo -bar"
         xmonad $ defaultConfig {
           ...
           logHook = dynamicLogWithPP $ defaultPP { ppOutput = hPutStrLn h }

If you use `spawnPipe`, be sure to redefine the `ppOutput` field of your pretty-printer as in the example above; by default the status will be printed to stdout rather than the pipe you create.

Even if you don't use a statusbar, you can still use `dynamicLogString` to show on-screen notifications in response to some events. For example, to show the current layout when it changes, you could make a keybinding to cycle the layout and display the current status:

        , ((mod1Mask, xK_a     ), sendMessage NextLayout >> (dynamicLogString myPP >>= \d->spawn $"xmessage "++d))

# Drop-in loggers

dzen :: LayoutClass l Window => XConfig l -> IO (XConfig (ModifiedLayout AvoidStruts l))

Run xmonad with a dzen status bar set to some nice defaults.

     main = xmonad =<< dzen myConfig

     myConfig = defaultConfig { ... }

The intent is that the above config file should provide a nice status bar with minimal effort.

If you wish to customize the status bar format at all, you'll have to use the `statusBar` function instead.

The binding uses the XMonad.Hooks.ManageDocks module to automatically handle screen placement for dzen, and enables 'mod-b' for toggling the menu bar.

xmobar :: LayoutClass l Window => XConfig l -> IO (XConfig (ModifiedLayout AvoidStruts l))

Run xmonad with a xmobar status bar set to some nice defaults.

     main = xmonad =<< xmobar myConfig

     myConfig = defaultConfig { ... }

This works pretty much the same as `dzen` function above.

statusBar

Arguments

:: LayoutClass l Window |
=> String | the command line to launch the status bar
-> PP | the pretty printing options
-> (XConfig Layout -> (KeyMask, KeySym)) | the desired key binding to toggle bar visibility
-> XConfig l | the base config
-> IO (XConfig (ModifiedLayout AvoidStruts l)) |

Modifies the given base configuration to launch the given status bar, send status information to that bar, and allocate space on the screen edges for the bar.

dynamicLog :: X ()

An example log hook, which prints status information to stdout in the default format:

     1 2 [3] 4 7 : full : title

That is, the currently populated workspaces, the current workspace layout, and the title of the focused window.

To customize the output format, see `dynamicLogWithPP`.

dynamicLogXinerama :: X ()

Workspace logger with a format designed for Xinerama:

     [1 9 3] 2 7

where 1, 9, and 3 are the workspaces on screens 1, 2 and 3, respectively, and 2 and 7 are non-visible, non-empty workspaces.

At the present time, the current layout and window title are not shown. The xinerama workspace format shown above can be (mostly) replicated using `dynamicLogWithPP` by setting `ppSort` to getSortByXineramaRule from XMonad.Util.WorkspaceCompare. For example,

     defaultPP { ppCurrent = dzenColor "red" "#efebe7"
               , ppVisible = wrap "[" "]"
               , ppSort    = getSortByXineramaRule
               }

xmonadPropLog' :: String -> String -> X ()

Write a string to a property on the root window. This property is of type UTF8_STRING. The string must have been processed by encodeString (dynamicLogString does this).

xmonadPropLog :: String -> X ()

Write a string to the _XMONAD_LOG property on the root window.

# Build your own formatter

dynamicLogWithPP :: PP -> X ()

Format the current status using the supplied pretty-printing format, and write it to stdout.

dynamicLogString :: PP -> X String

The same as `dynamicLogWithPP`, except it simply returns the status as a formatted string without actually printing it to stdout, to allow for further processing, or use in some application other than a status bar.

data PP

The `PP` type allows the user to customize the formatting of status information.

Constructors

PP |
Fields ppCurrent :: WorkspaceId -> String how to print the tag of the currently focused workspace ppVisible :: WorkspaceId -> String how to print tags of visible but not focused workspaces (xinerama only) ppHidden :: WorkspaceId -> String how to print tags of hidden workspaces which contain windows ppHiddenNoWindows :: WorkspaceId -> String how to print tags of empty hidden workspaces ppUrgent :: WorkspaceId -> String format to be applied to tags of urgent workspaces. ppSep :: String separator to use between different log sections (window name, layout, workspaces) ppWsSep :: String separator to use between workspace tags ppTitle :: String -> String window title format ppLayout :: String -> String layout name format ppOrder :: [String] -> [String] how to order the different log sections. By default, this function receives a list with three formatted strings, representing the workspaces, the layout, and the current window title, respectively. If you have specified any extra loggers in `ppExtras`, their output will also be appended to the list. To get them in the reverse order, you can just use `ppOrder = reverse`. If you don't want to display the current layout, you could use something like `ppOrder = \(ws:_:t:_) -> [ws,t]`, and so on. ppSort :: X ([WindowSpace] -> [WindowSpace]) how to sort the workspaces. See XMonad.Util.WorkspaceCompare for some useful sorts. ppExtras :: [X (Maybe String)] loggers for generating extra information such as time and date, system load, battery status, and so on. See XMonad.Util.Loggers for examples, or create your own! ppOutput :: String -> IO () applied to the entire formatted string in order to output it. Can be used to specify an alternative output method (e.g. write to a pipe instead of stdout), and/or to perform some last-minute formatting.

defaultPP :: PP

The default pretty printing options, as seen in `dynamicLog`.

# Example formatters

dzenPP :: PP

Settings to emulate dwm's statusbar, dzen only.

xmobarPP :: PP

Some nice xmobar defaults.

sjanssenPP :: PP

The options that sjanssen likes to use with xmobar, as an example. Note the use of `xmobarColor` and the record update on `defaultPP`.

byorgeyPP :: PP

The options that byorgey likes to use with dzen, as another example.

# Formatting utilities

wrap

Arguments

:: String | left delimiter
-> String | right delimiter
-> String | output string
-> String |

Wrap a string in delimiters, unless it is empty.

pad :: String -> String

Pad a string with a leading and trailing space.

trim :: String -> String

Trim leading and trailing whitespace from a string.

shorten :: Int -> String -> String

Limit a string to a certain length, adding ... if truncated.

xmobarColor

Arguments

:: String | foreground color: a color name, or #rrggbb format
-> String | background color
-> String | output string
-> String |

Use xmobar escape codes to output a string with given foreground and background colors.

xmobarStrip :: String -> String

Strip xmobar markup.

dzenColor

Arguments

:: String | foreground color: a color name, or #rrggbb format
-> String | background color
-> String | output string
-> String |

Use dzen escape codes to output a string with given foreground and background colors.

dzenEscape :: String -> String

Escape any dzen metacharacters.

dzenStrip :: String -> String

Strip dzen formatting or commands.

# Internal formatting functions

pprWindowSet :: WorkspaceSort -> [Window] -> PP -> WindowSet -> String

Format the workspace information, given a workspace sorting function, a list of urgent windows, a pretty-printer format, and the current WindowSet.

pprWindowSetXinerama :: WindowSet -> String

# To Do

- incorporate dynamicLogXinerama into the PP framework somehow
- add an xmobarEscape function