dzen-utils (empty) → 0.1

raw patch · 13 files changed

+2356/−0 lines, 13 filesdep +basedep +colourdep +processsetup-changed

Dependencies added: base, colour, process

Files

• Example1.hs +19/−0
• Example2.hs +37/−0
• LICENSE +674/−0
• Setup.lhs +8/−0
• System/Dzen.hs +290/−0
• System/Dzen/Bars.hs +295/−0
• System/Dzen/Base.hs +294/−0
• System/Dzen/Colour.hs +108/−0
• System/Dzen/Graphics.hs +124/−0
• System/Dzen/Internal.hs +183/−0
• System/Dzen/Padding.hs +169/−0
• System/Dzen/Process.hs +115/−0
• dzen-utils.cabal +40/−0

@@ -0,0 +1,19 @@+import Data.Time+import System.Dzen+import System.Locale++printer :: Printer (String, ZonedTime)+printer = str "Wndn: " +++ cstr +++ str " - " +++ simple' format+  where format = formatTime defaultTimeLocale "%a %e %b %H:%M:%S"++supply :: IO (String, ZonedTime)+supply = getCurrentWindow ## getZonedTime++myDzen :: IO ()+myDzen = runDzen "dzen2" [] 500 printer supply++getCurrentWindow :: IO String+getCurrentWindow = return "My =^.^= Lolcats"++main :: IO ()+main = myDzen

@@ -0,0 +1,37 @@+import Data.Monoid+import Data.Time+import System.Dzen+import System.Locale++sep :: DString+sep = mconcat [str " ", rectO 5 5, str " "]++timeBar :: Printer Int+timeBar = cgdbar False (40,10) Nothing Nothing True (0, 60*60-1)++zonedSecs :: ZonedTime -> Int+zonedSecs = extract . localTimeOfDay . zonedTimeToLocalTime+    where extract t = let minutes = fromIntegral (todMin t)+                      in round (minutes * 60 + todSec t)++timeBar' :: Printer ZonedTime+timeBar' = comap zonedSecs timeBar++time :: Printer ZonedTime+time = simple' format +=+ timeBar'+  where format = formatTime defaultTimeLocale "%a %e %b %H:"++printer :: Printer (String, ZonedTime)+printer = str "Wndn: " +++ cstr +++ sep +++ time++supply :: IO (String, ZonedTime)+supply = getCurrentWindow ## getZonedTime++myDzen :: IO ()+myDzen = runDzen "dzen2" [] 500 printer supply++getCurrentWindow :: IO String+getCurrentWindow = return "My =^.^= Lolcats"++main :: IO ()+main = myDzen

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If not, see <http://www.gnu.org/licenses/>.++Also add information on how to contact you by electronic and paper mail.++  If the program does terminal interaction, make it output a short+notice like this when it starts in an interactive mode:++    <program>  Copyright (C) <year>  <name of author>+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.+    This is free software, and you are welcome to redistribute it+    under certain conditions; type `show c' for details.++The hypothetical commands `show w' and `show c' should show the appropriate+parts of the General Public License.  Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++  You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<http://www.gnu.org/licenses/>.++  The GNU General Public License does not permit incorporating your program+into proprietary programs.  If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library.  If this is what you want to do, use the GNU Lesser General+Public License instead of this License.  But first, please read+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

@@ -0,0 +1,8 @@+#!/usr/bin/env runhaskell++> module Main (main) where+>+> import Distribution.Simple+>+> main :: IO ()+> main = defaultMain

@@ -0,0 +1,290 @@+-- |+-- Module      :  System.Dzen+-- Copyright   :  (c) 2009 Felipe A. Lessa+-- License     :  GPL 3 (see the LICENSE file in the distribution)+--+-- Maintainer  :  felipe.lessa@gmail.com+-- Stability   :  experimental+-- Portability :  semi-portable (uses MPTC and type families)+--+-- Hello!+--+-- This is @dzen-utils@' main module. It re-exports every other+-- module from this library, so you may just say+--+-- > import System.Dzen+--+-- and you'll have everything in hand. To learn more about this+-- library, please see the documentation of each module exported here.+-- To get you started, there are some simple examples below. :)++module System.Dzen+    (-- * Example 1+     -- $example1p1++     -- ** Constructing - Part 1+     -- $example1p2++     -- ** Constructing - Part 2+     -- $example1p3++     -- ** Applying+     -- $example1p4++     -- ** Whole code+     -- $example1p5++++     -- * Example 2+     -- $example2p1++     -- ** Separator+     -- $example2p2++     -- ** Time bar+     -- $example2p3++     -- ** Glueing the time text with the bar+     -- $example2p4++     -- ** Whole code+     -- $example2p5+++     -- * Module exports+     module System.Dzen.Base+    ,module System.Dzen.Colour+    ,module System.Dzen.Graphics+    ,module System.Dzen.Padding+    ,module System.Dzen.Bars+    ,module System.Dzen.Process+    ) where++import System.Dzen.Base+import System.Dzen.Colour+import System.Dzen.Graphics+import System.Dzen.Padding+import System.Dzen.Bars+import System.Dzen.Process+++-- $example1p1+--+-- Suppose you have+--+-- > import Data.Time+-- > import System.Locale+-- >+-- > getZonedTime     :: IO ZonedTime -- from time package+-- > getCurrentWindow :: IO String    -- from somewhere you know :)+--+-- and that you want your bar to look like+--+-- > "Wndw: [my window title here] - Sun 15 Mar 07:10:02"+--+-- Okay, that's pretty nice. What you will do first will be to+-- construct the 'Printer' of your bar. Basically, what you want is to+-- concatenate @\"Wndw: \"@, the result of @getCurrentWindow@, the+-- separator, and the formated result of @getZonedTime@. The @Printer@+-- we'll build below contain all the information necessary to create+-- the final output string above from the two @get@ functions!+++-- $example1p2+--+-- To write the constant strings, we use 'str':+--+-- > str          :: String -> DString+-- > str "Wndw: " :: DString+-- > str " - "    :: DString+--+-- That is pretty straightforward. But how can we print the current+-- window? We will just use 'cstr' here+--+-- > cstr :: Printer String+--+-- While @str@ is used as a common function, you just apply the+-- string you want to it, @cstr@ will get the string from another+-- source. What we'll do shortly is to pipe @IO String@ into+-- @Printer String@ to obtain our final output. Instead of+-- @Printer a@, think of it as @Printer input@.+--+-- To concatenate we just have to use '+++' from 'Combine', which+-- is an ugly class used to create beautiful types:+--+-- > str "Wndn: " +++ cstr +++ str " - "  :: Printer String+--+-- Whenever you concatenate a @DString@ with a @Printer input@, you+-- get a @Printer input@ as a result. That is, if you concatenate a+-- constant string to something that takes an input and produces a+-- string, what you get is something that takes an input and produces+-- the concatenated string. Note that you don't need to write the+-- type above.++-- $example1p3+--+-- Now we can't just go ahead and use @cstr@ directly with+-- @getZonedTime@ because, unlike @getCurrentWindow@, its result is+-- not a string, but a @ZonedTime@. To format the @ZonedTime@ is+-- outside the scope of this example, but you can get the format+-- shown above with+--+-- > format :: ZonedTime -> String+-- > format = formatTime defaultTimeLocale "%a %e %b %H:%M:%S"+--+-- While you can write+--+-- > fmap format getZoneTime :: IO String+--+-- you don't need to push the format function into the @IO@ monad,+-- just put it in the @Printer@, the place where it belongs! To+-- accomplish that use 'simple'' instead of 'cstr':+--+-- > simple'        :: (input -> String) -> Printer input+-- > simple' format :: Printer ZonedTime+--+-- And it's done! Concatenating everything:+--+-- > printer :: Printer (String, ZonedTime)+-- > printer = str "Wndn: " +++ cstr +++ str " - " +++ simple' format+--+-- Whenever you concatenate @Printer a@ with @Printer b@ you+-- get @Printer (a,b)@.++-- $example1p4+--+-- In the end we just want strings, not @Printer@s, so we need to+-- apply our @printer@ to some inputs. We already have functions for+-- each part of our input, but we need to combine them. We may just+-- use @##@ from "System.Dzen.Process" in this case (and in most others as+-- well):+--+-- > supply :: IO (String, ZonedTime)+-- > supply = getCurrentWindow ## getZonedTime+--+-- Now we could use 'apply', 'applyMany' or 'applyForever' to+-- get strings out of our printer, but we'll use 'runDzen' directly+-- which is a tad easier:+--+-- > myDzen :: IO ()+-- > myDzen = runDzen "dzen2" [] 500 printer supply+--+-- And that's it! You may use @myDzen@ directly as @main@, or you+-- may use @forkIO myDzen@ inside @xmonad@. Pretty nice, uh?++-- $example1p5+--+-- This is the whole code plus a stub @getCurrentWindow@ and a @main@.+-- We omit the signatures on purpose to show how you could have+-- written it lazily. You may also get the file @Example1.hs@ from the+-- source code which contains all the type signatures.+--+-- >import Data.Time+-- >import System.Dzen+-- >import System.Locale+-- >+-- >printer = str "Wndn: " +++ cstr +++ str " - " +++ simple' format+-- >format  = formatTime defaultTimeLocale "%a %e %b %H:%M:%S"+-- >supply  = getCurrentWindow ## getZonedTime+-- >myDzen  = runDzen "dzen2" [] 500 printer supply+-- >+-- >getCurrentWindow = return "My =^.^= Lolcats"+-- >main = myDzen++++++-- $example2p1+--+-- Now we want to do something different: let's have a graphical+-- bar for our clock! And, why not, a graphical separator.++-- $example2p2+--+-- The graphical separator will be very simple. Instead of dash+-- (@\" - \"@) we'll use a small dot:+--+-- > import Data.Monoid+-- >+-- > sep :: DString+-- > sep = mconcat [pos 4, rect 3 3, pos 4]+--+-- This is a 3x3 rectangle with 4 pixels of spacing on each side.+-- And, thats it!++-- $example2p3+--+-- Now something more challenging. Instead of showing the minutes+-- and the seconds, we want to show a graphical bar, something like+--+-- > "Wndw: [my window title here] - Sun 15 Mar 07:[==    ]"+--+-- Well, that bar will show minutes and seconds, but we can+-- take as input just seconds, ranging from @0@ to @60*60-1@.+-- We'll use plain simple 'cgdbar', which mimics @gdbar@:+-- (please look at "System.Dzen.Bars" for more info)+--+-- > timeBar :: Printer Int+-- > timeBar = cgdbar False (40,10) Nothing Nothing True (0, 60*60-1)+--+-- But what we have is not the number of seconds, but a @ZonedTime@.+-- So we need+--+-- > zonedSecs :: ZonedTime -> Int+-- > zonedSecs = extract . localTimeOfDay . zonedTimeToLocalTime+-- >     where extract t = let minutes = fromIntegral (todMin t)+-- >                       in round (minutes * 60 + todSec t)+--+-- As @Printer@s are cofunctors, we can use 'comap' to get+-- a suitable @timeBar@:+--+-- > timeBar' :: Printer ZonedTime+-- > timeBar' = comap zonedSecs timeBar++-- $example2p4+--+-- We also want the rest of the time, not just the bar. First,+-- we need a new @format@, as we don't want to show the minutes+-- anymore:+--+-- > format :: ZonedTime -> String+-- > format = formatTime defaultTimeLocale "%a %e %b %H:"+--+-- You may be tempted to write @simple' format +++ timeBar'@ now,+-- but there's a small glitch: it would have type+-- @Printer (ZonedTime, ZonedTime)@, but we want both to use+-- the same @ZonedTime@. We could use 'comap' again or 'combine',+-- but it is easier to write+--+-- > time :: Printer ZonedTime+-- > time = simple' format +=+ timeBar'++-- $example2p5+--+-- The rest is just glue! So we now present the whole code,+-- again in a compact form. See @Example2.hs@ for the whole+-- code with type signatures:+--+-- >import Data.Monoid+-- >import Data.Time+-- >import System.Dzen+-- >import System.Locale+-- >+-- >zonedSecs = extract . localTimeOfDay . zonedTimeToLocalTime+-- >    where extract t = let minutes = fromIntegral (todMin t)+-- >                      in round (minutes * 60 + todSec t)+-- >+-- >time = simple' format +=+ comap zonedSecs timeBar+-- >  where format  = formatTime defaultTimeLocale "%a %e %b %H:"+-- >        timeBar = cgdbar False (40,10) Nothing Nothing True (0, 60*60-1)+-- >+-- >printer = str "Wndn: " +++ cstr +++ sep +++ time+-- >    where sep = mconcat [str " ", rectO 5 5, str " "]+-- >+-- >supply = getCurrentWindow ## getZonedTime+-- >myDzen = runDzen "dzen2" [] 500 printer supply+-- >+-- >getCurrentWindow = return "My =^.^= Lolcats"+-- >main = myDzen

@@ -0,0 +1,295 @@+-- |+-- Module      :  System.Dzen.Bars+-- Copyright   :  (c) 2009 Felipe A. Lessa+-- License     :  GPL 3 (see the LICENSE file in the distribution)+--+-- Maintainer  :  felipe.lessa@gmail.com+-- Stability   :  experimental+-- Portability :  semi-portable (uses MPTC and type families)+--+-- Drawing of progress bars (sometimes called progress gauges),+-- like @dbar@ and @gdbar@ utilities work but a little more+-- powerful (in fact, we can simulate both utilities, see 'dbar'+-- and 'gdbar').+--+-- An example of text progress bar that can be drawn:+--+-- > 96% [==================> ]++module System.Dzen.Bars+    (-- * Simple interface+     -- ** Mimicking @dbar@+     dbar+    ,cdbar+     -- ** Mimicking @gdbar@+    ,gdbar+    ,cgdbar++     -- * Generic interface+    ,bar+    ,cbar+    ,BarType(..)+    ,BarTextType(..)+    ,BarText(..)++     -- * Styles of the simple interfaces+     -- You may want to use some of these as the+     -- base for your own style. Look at the sources!+    ,dbar_style+    ,gdbar_style+    ) where++import Control.Arrow+import Data.Monoid+import System.Dzen.Base+import System.Dzen.Colour+import System.Dzen.Graphics+import System.Dzen.Padding++-- | Helper function used below.+maybeLeft :: Bool -> BarText+maybeLeft False = None+maybeLeft True  = AtLeft Percentage++-- | Mimics the dbar utility. Uses the 'dbar_style'.+dbar :: (Num a, Enum a, Ord a)+     => Bool  -- ^ If @True@, write the percentage on the left.+     -> Width -- ^ Width of the bar interior.+     -> (a,a) -- ^ Minimum and maximum values.+     -> a     -- ^ Actual value.+     -> DString+dbar p = bar (maybeLeft p) . dbar_style '='++-- | Mimics the dbar utility while getting the input dinamically.+cdbar :: (Num a, Enum a, Ord a) => Bool -> Width -> (a,a) -> Printer a+cdbar p = cbar (maybeLeft p) . dbar_style '='++-- | The style produced by the dbar utility.+dbar_style :: Char -> Width -> BarType+dbar_style c w = Text {txtOpen       = "["+                      ,txtFilled     = str [c]+                      ,txtMiddle     = Nothing+                      ,txtBackground = " "+                      ,txtClose      = "]"+                      ,txtWidth      = w}++-- | Mimics the gdbar utility. Uses the 'gdbar_style'.+gdbar :: (Num a, Enum a, Ord a)+      => Bool            -- ^ If @True@, write the percentage on the left.+      -> (Width, Height) -- ^ Size of the whole bar (excluding text).+      -> Maybe DColour   -- ^ Filled colour (see 'grpFilled').+      -> Maybe DColour   -- ^ Background/border colour+                         --   (see 'grpBackground' and 'grpBorder').+      -> Bool            -- ^ @True@ to mimic @-o@ option (outline).+      -> (a,a)           -- ^ Minimum and maximum values.+      -> a               -- ^ Actual value.+      -> DString+gdbar p = (((bar (maybeLeft p) .) . ) .) . gdbar_style++-- | Mimics the gdbar utility while getting the input dinamically.+cgdbar :: (Num a, Enum a, Ord a) => Bool -> (Width, Height)+       -> Maybe DColour -> Maybe DColour -> Bool -> (a,a) -> Printer a+cgdbar p = (((cbar (maybeLeft p) .) . ) .) . gdbar_style++-- | The style of gdbar (or something very close).+gdbar_style :: (Width, Height) -> Maybe DColour+            -> Maybe DColour -> Bool -> BarType+gdbar_style size_ fore back False =+    Filled {grpFilled     = fore+           ,grpBackground = back+           ,grpSize       = size_}+gdbar_style size_ fore back True =+    Hollow {grpFilled     = fore+           ,grpBackground = Nothing -- That's what gdbar does!+           ,grpBorder     = back+           ,grpSize       = size_}+++++++++-- | The type of the bar to be drawn.+data BarType = -- | Draws a text bar. Note, however, that the+               --  @DString@s below can be anything, not just+               --  text. For example, they may have colours ('fg'),+               --  shapes ('rect's and 'circ's) or 'icon's, you may+               --  even simulate both 'Filled' and 'Hollow' using just+               --  'Text' (although performance would be suboptimal).+               Text {+                  -- | Text written at the start.+                  txtOpen       :: !DString+                  -- | Text written for each filled square.+                 ,txtFilled     :: !DString+                  -- | Text written for the last filled square.+                  --   If @Nothing@, the same as the filled square+                  --   is used, but more fairly than if you used+                  --   the same value for filled and middle chars.+                 ,txtMiddle     :: !(Maybe DString)+                  -- | Text written for the unfilled squares.+                 ,txtBackground :: !DString+                  -- | Text written at the end.+                 ,txtClose      :: !DString+                  -- | How many squares there should be+                  --   (i.e. does not count the open and close parts).+                 ,txtWidth      :: !Width}++               -- | Draws a filled graphical bar, like @gdbar@ would.+             | Filled {+                  -- | Colour used for filled squares, or @Nothing@+                  --   to use the default /foreground/ colour.+                  grpFilled     :: !(Maybe DColour)+                  -- | Colour used for the unfilled squares, or+                  --   @Nothing@ to use the default /background/+                  --   colour.+                 ,grpBackground :: !(Maybe DColour)+                  -- | Size of the whole bar.+                 ,grpSize       :: !(Width, Height)}++               -- | Draws a filled graphical bar with a surrounding+               --   border.+             | Hollow {+                  -- | Same as @grpFilled@ above.+                  grpFilled     :: !(Maybe DColour)+                  -- | Same as @grpBackground@ above.+                 ,grpBackground :: !(Maybe DColour)+                  -- | Colour of the border, or @Nothing@ to use+                  --   the default /foreground/ colour.+                 ,grpBorder     :: !(Maybe DColour)+                  -- | Size of the whole bar (including border).+                 ,grpSize       :: !(Width, Height)}+               deriving (Show)++-- | The type of text to be written.+data BarTextType = Percentage | Absolute+                 deriving (Eq, Ord, Show, Enum)++-- | How to draw the bar text. @AtLeft@ and @AtRight@ are used to+--   specify if the text is at the left or the right of the bar,+--   and @None@ means that no text will be written.+data BarText = AtLeft !BarTextType+             | AtRight !BarTextType+             | None+               deriving (Eq, Ord, Show)+++-- | Draws a bar and optionally some text describing some quantity+--   in relation to some range. For example,+--+--   > bar (AtLeft Percentage) (Text "[" "=" (Just ">") " " "]" 20) (-10,10) i+--+--   produces the bars+--+--   > "  2% [                    ]"    where i = -9.6+--   > "  2% [>                   ]"    where i = -9.5+--   > " 50% [=========>          ]"    where i = 0+--   > " 96% [==================> ]"    where i = 9.4+--   > " 99% [===================>]"    where i = 9.99+--   > "100% [====================]"    where i = 10+--+--   Note that the text is always padded to four characters. If the+--   first bar above had @AtRight Percentage@ the result would be+--+--   > "[                    ] 2%  "+--+--   so the padding always inserts the spaces on the outside.+bar :: (Num a, Enum a, Ord a) => BarText ->+       BarType -> (a,a) -> a -> DString+bar txt bar_ r v =+    case txt of+      None      -> drawnBar+      AtLeft t  -> mconcat [padL 4 (barText t r v), " ", drawnBar]+      AtRight t -> mconcat [drawnBar, " ", padR 4 (barText t r v)]+    where drawnBar = barDraw bar_ r v++-- | 'bar' wrapped with 'simple' so that the value is+--   taken from an input.+cbar :: (Num a, Enum a, Ord a) => BarText ->+         BarType -> (a,a) -> Printer a+cbar = ((simple .) .) . bar+++-- | Draws the text part of the bar.+barText :: (Num a, Enum a, Ord a) => BarTextType -> (a,a) -> a -> DString+barText Absolute   _     val = str $ show val+barText Percentage range val+    = str $ (show . fst . fst $ barRound 100 range val) ++ "%"+{-# INLINE barText #-}+++-- | Draws the bar itself.+barDraw :: (Num a, Enum a, Ord a) => BarType -> (a,a) -> a -> DString+barDraw (Text {txtOpen = to+              ,txtFilled = tf+              ,txtMiddle = Just tm   -- <<<<<<<<+              ,txtBackground = tb+              ,txtClose = tc+              ,txtWidth = tw}) range val+    = let ((f, b), more) = barRound tw range val+          r | f >= tw = to : replicate tw tf+            | f > 0   = to : replicate f' tf ++ tm : replicate b' tb+            | more    = to : tm : replicate (tw-1) tb+            | True    = to : replicate tw tb+            where (f',b') | more      = (f, b-1)+                          | otherwise = (f-1, b)+      in mconcat r `mappend` tc++barDraw (Text {txtOpen = to+              ,txtFilled = tf+              ,txtMiddle = Nothing   -- <<<<<<<<+              ,txtBackground = tb+              ,txtClose = tc+              ,txtWidth = tw}) range val+    = let (f, b) = fst $ barRound tw range val+          r = to : replicate f tf ++ replicate b tb+      in mconcat r `mappend` tc++barDraw (Filled {grpFilled = gf+                ,grpBackground = gb+                ,grpSize = (gw,gh)}) range val+    = let (f, b) = fst $ barRound gw range val+      in mconcat $ [changeFg gf $ rect f gh+                   ,transpRect gb b gh]++barDraw (Hollow {grpFilled = gf+                ,grpBackground = gb+                ,grpBorder = gbd+                ,grpSize = (gw_orig, gh_orig)}) range val+    = let gw = gw_orig - 4 -- Account for the border+          gh = gh_orig - 4+          (f, b) = fst $ barRound gw range val+      in mconcat $ [pos 2+                   ,changeFg gf $ rect f gh+                   ,transpRect gb b gh+                   ,pos $ negate (gw + 2)+                   ,changeFg gbd $+                             ignoreBg True $+                             rectO gw_orig gh_orig]+{-# INLINE barDraw #-}++-- | Simulates transparency by not drawing at all.+transpRect :: Maybe DColour -> Width -> Height -> DString+transpRect Nothing  w _ = pos w+transpRect (Just c) w h = fg c $ rect w h+++-- | Function used for rounding. It always rounds towards minus+--   infinity, so only the maximum value gives a full bar.+--   Values outside the range are clamped. The boolean returned+--   is @True@ iff the value would be one more if we rounded+--   half-up.+barRound :: (Num a, Enum a, Ord a) =>+            Width -> (a,a) -> a -> ((Int, Int), Bool)+barRound w r n = let (f, b) = barRound' w r n in ((f, w - f), b)++barRound' :: (Num a, Enum a, Ord a) =>+             Width -> (a,a) -> a -> (Int, Bool)+barRound' w (mini,maxi) n+    | maxi < mini = error "System.Dzen.Bars.bar: max value is less than min."+    | n <= mini   = (0, False)+    | n >= maxi   = (w, False)+    | otherwise   = let r = fromEnum (2 * fromIntegral w * (n-mini))+                            `div` fromEnum (maxi-mini)+                    in second (== 1) (r `divMod` 2)

@@ -0,0 +1,294 @@+-- |+-- Module      :  System.Dzen.Base+-- Copyright   :  (c) 2009 Felipe A. Lessa+-- License     :  GPL 3 (see the LICENSE file in the distribution)+--+-- Maintainer  :  felipe.lessa@gmail.com+-- Stability   :  experimental+-- Portability :  semi-portable (MPTC and type families)+--+-- This module contains most of the basic functions of+-- this package. The data types presented here are:+--+--  ['DString'] strings that support constant time concatenation,+--    dzen attributes and some instropection.+--+--  ['Printer'] encapsulates functions take take some input and+--    produce a @DString@ as a result, allowing them to be+--    combined and applied.++module System.Dzen.Base+    (-- * Dzen Strings+     DString+    ,str+    ,rawStr+    ,toString+    ,size+    ,parens++     -- * Printers+    ,Printer+    ,comap+    ,simple+    ,simple'+    ,inputPrinter+    ,inputPrinter'+    ,cstr+    ,cshow++     -- * Combining printers+    ,Combine(..)+     -- $combine+    ,(+=+)+    ,(+-+)+    ,(+/+)+    ,(+<+)+    ,combine++     -- * Applying printers+     -- $apply+    ,apply+    ,applyMany+    ,applyMany_+    ,applyForever++     -- * Transforming+    ,Transform(transform)+    ) where++import Prelude hiding ((++))+import Control.Arrow hiding ((+++))+import Data.Function+import Data.String+import Data.Monoid++import System.Dzen.Internal++++++-- | Converts a @String@ into a @DString@, escaping characters if+--   needed. This function is used in 'fromString' from 'IsString',+--   so @DString@s created by @OverloadedStrings@ extension will+--   be escaped.+str :: String -> DString+str = fromString++-- | Used internally, use 'mappend'.+(++) :: Monoid a => a -> a -> a+(++) = mappend++-- | @parens open close d@ is equivalent to @mconcat [open, d, close]@.+parens :: DString -> DString -> DString -> DString+parens open close d = open ++ d ++ close++++++++-- | A @Printer@ is a cofunctor.+comap :: (a -> b) -> (Printer b -> Printer a)+comap f (P dp) = P $ \st input -> let (out,dp') = dp st (f input)+                                  in (out, comap f dp')++-- | Constructs a @Printer@ that depends only on the input.+simple :: (a -> DString) -> Printer a+simple f = fix $ P . const . (. f) . flip (,)++-- | Like 'simple', but using @String@s.+simple' :: (a -> String) -> Printer a+simple' = simple . (str .)++-- | Constructs a @Printer@ that depends on the current+--   and on the previous inputs.+inputPrinter :: (b -> a -> (DString, b)) -> b -> Printer a+inputPrinter f b = P . const $ second (inputPrinter f) . f b++-- | Like 'inputPrinter', but with @String@s.+inputPrinter' :: (b -> a -> (String, b)) -> b -> Printer a+inputPrinter' = inputPrinter . ((first str .) .)++-- | Works like 'str', but uses the input instead of being+--   constant. In fact, it is defined as @simple str@.+cstr :: Printer String+cstr = simple str++-- | Same as @simple' show@.+cshow :: Show a => Printer a+cshow = simple' show++++++++++-- | Class used for combining @DString@s and @Printer@s+--   exactly like 'mappend'.+--+--   Note that we don't lift @DString@ to @Printer ()@ and use a+--   plain function of type @Printer a -> Printer b+--   -> Printer (a,b)@ because that would create types such as+--   @Printer ((),(a,((),(b,()))))@ instead of+--   @Printer (a,b)@.+class Combine a b where+    -- | The type of the combined input of @a@ with @b@.+    type Combined a b :: *++    -- | Combine @a@ into @b@. Their outputs are concatenated.+    (+++) :: a -> b -> Combined a b++infixr 4 ++++infixr 4 +=++infixr 4 +-++infixr 4 +/++infixr 4 +<+++instance Combine DString DString where+    type Combined DString DString = DString+    (+++) = (++)++instance Combine DString (Printer a) where+    type Combined DString (Printer a) = Printer a+    ds1 +++ (P dp2) =+        P $ \st input -> let (out2,dp2') = dp2 st input+                         in (ds1 ++ out2, ds1 +++ dp2')++instance Combine (Printer a) DString where+    type Combined (Printer a) DString = Printer a+    (P dp1) +++ ds2 =+        P $ \st input -> let (out1,dp1') = dp1 st input+                         in (out1 ++ ds2, dp1' +++ ds2)++instance Combine (Printer a) (Printer b) where+    type Combined (Printer a) (Printer b) = Printer (a,b)+    (+++) = combine id++-- $combine+--+-- We currently have the following @Combined@ types:+--+-- > type Combined DString    Dstring      = DString+-- > type Combined DString    (Printer a)  = Printer a+-- > type Combined (Printer a) DString     = Printer a+-- > type Combined (Printer a) (Printer b) = Printer (a,b)+--+-- For example, if @a :: DString@, @b,e :: Printer Int@,+-- @c :: Printer Double@ and @d :: DString@, then+--+-- > (a +++ b +++ c +++ d +++ e) :: Printer (Int, (Double, Int))+++-- | Sometimes you want two printers having the same input,+--   but @p1 +++ p2 :: Printer (a,a)@ is not convenient. So+--   @p1 +=+ p2 :: Printer a@ works like '+++' but gives+--   the same input for both printers.+(+=+) :: Printer a -> Printer a -> Printer a+(+=+) = combine (\x -> (x, x))++-- | Works like '+=+' but the second printer's input is a tuple.+(+-+) :: Printer a -> Printer (a,b) -> Printer (a,b)+(+-+) = combine (\x -> (fst x, x))+++-- | While you may say @p1 +=+ (ds1 +++ ds2 +++ p2)@,+--   where @p1,p2 :: Printer a@ and @ds1,ds2 :: DString@,+--   you can't say @p1 +=+ (po +++ p2)@ nor+--   @(p1 +++ po) +=+ p2@ where @po :: Printer b@.+--+--   This operator works like '+++' but shifts the+--   tuple, giving you @Printer (b,a)@ instead of+--   @Printer (a,b)@. In the example above you may+--   write @p1 +>+ po +/+ p2@.+(+/+) :: Printer a -> Printer b -> Printer (b,a)+(+/+) = combine (\(a,b) -> (b,a))+++-- | This operator works like '+/+' but the second+--   printer's input is a tuple. Use it like+--+--   > pA1 +-+ pB +<+ pC +<+ pD +/+ pA2 :: Printer (a,(b,(c,d)))+--+--   where both @pA1@ and @pA2@ are of type @Printer a@.+(+<+) :: Printer a -> Printer (b,c) -> Printer (b,(a,c))+(+<+) = combine (\(b,(a,c)) -> (a,(b,c)))+++-- | This is a general combine function for @Printer@s.+--   The outputs are always concatenated, but the inputs+--   are given by the supplied function.+--+--   The combining operators above are defined as:+--+--   > (+++) = combine id    -- restricted to Printers+--   > (+=+) = combine (\x -> (    x, x))+--   > (+-+) = combine (\x -> (fst x, x))+--   > (+/+) = combine (\(a,b)     -> (b,a))+--   > (+<+) = combine (\(b,(a,c)) -> (a,(b,c)))+--+--   Note also the resamblence with 'comap'. In fact,+--   if we have @(+++)@ and @comap@ we may define+--+--   > combine f a b = comap f (a +++ b)       -- pointwise+--   > combine = flip (.) (+++) . (.) . comap  -- pointfree+--+--   and with @combine@ and @simple@ we may define+--+--   > comap f = combine (\i -> ((), f i)) (simple $ const mempty) -- pointwise+--   > comap = flip combine (simple $ const mempty) . ((,) () .)   -- pointfree+combine :: (c -> (a, b)) -> Printer a -> Printer b -> Printer c+combine split = f+  where f (P dp1) (P dp2) =+            P $ \st input -> let (input1, input2) = split input+                                 (out1, dp1') = dp1 st input1+                                 (out2, dp2') = dp2 st input2+                             in (out1 ++ out2, f dp1' dp2')+                     -- Again, note how state is duplicated+{-# INLINE combine #-}+++++-- $apply+--+-- Note that applying should be the /last thing/ you do,+-- and you should /never/ apply inside a 'DString'+-- or 'Printer'. Doing so may cause undefined behaviour+-- because both @DString@ and @Printer@ contain some internal+-- state. We create a fresh internal state when applying,+-- so applying inside them will not take their internal+-- state into account. You've been warned!+++-- | Apply a printer many times in sequence. Most of the+--   time you would ignore the final printer using+--   'applyMany_', but it can be used to continue applying.+applyMany :: Printer a -> [a] -> ([String], Printer a)+applyMany p (i:is) = let (s,p') = apply p i+                         rest = applyMany p' is+                     in (s : fst rest, snd rest)+applyMany p [] = ([], p)+++-- | Like 'applyMany' but ignoring the final printer.+applyMany_ :: Printer a -> [a] -> [String]+applyMany_ p (i:is) = let (s,p') = apply p i in s : applyMany_ p' is+applyMany_ _ [] = []+++-- | Apply a printer forever inside a monad. The first action+--   is used as a supply of inputs while the second action+--   receives the output before the next input is requested.+--+--   Note that your supply may be anything. For example,+--   inside @IO@ you may use @threadDelay@:+--+--   > applyForever (threadDelay 100000 >> getInfo) (hPutStrLn dzenHandle)+applyForever :: Monad m => Printer a -> m a -> (String -> m ()) -> m ()+applyForever p get act = get >>= uncurry (>>) . (act *** f) . apply p+    where f p' = applyForever p' get act

@@ -0,0 +1,108 @@+-- |+-- Module      :  System.Dzen.Colour+-- Copyright   :  (c) 2009 Felipe A. Lessa+-- License     :  GPL 3 (see the LICENSE file in the distribution)+--+-- Maintainer  :  felipe.lessa@gmail.com+-- Stability   :  experimental+-- Portability :  semi-portable (uses MPTC and type families)+--+-- Support for colours. This module is entirely based on the @colour@+-- package, so we strongly recommend that you at least+--+-- > import qualified Data.Colour.Names as C+--+-- which will import various aliases for creating 'Colour's.+--+-- Note changing the colours using the functions below do not hinder+-- the use of automatic padding.++module System.Dzen.Colour+    (-- * Changing colours+     DColour+    ,fg+    ,bg++     -- * Reseting to the defaults+    ,defFg+    ,defBg++     -- * Change or reset+    ,changeFg+    ,changeBg+    ) where++import Data.Colour.SRGB+import System.Dzen.Base+import System.Dzen.Internal+++++-- | Set the foreground colour. Note that the foreground+--   colour is changed only inside the transformed @DString@+--   or @Printer@, unlike using @\"^fg\"@ which may affect+--   subsequent strings.+--+--   So you may write+--   @fg 'black' (fg 'lime' (str \"lime\") +++ str \"black\")@+--   and it works like you expect it to.+fg :: Transform a => DColour -> (a -> a)+fg = changeFg . Just++-- | Like 'fg', but set the background colour.+bg :: Transform a => DColour -> (a -> a)+bg = changeBg . Just+++++-- | Set the foreground colour to be the default one,+--   which is specified as a parameter to dzen (outside+--   the control of the printers).+defFg :: Transform a => a -> a+defFg = changeFg Nothing++-- | Like 'defFg', but for the background colour.+defBg :: Transform a => a -> a+defBg = changeBg Nothing+++++-- | Set the foreground to be a specified one (@Just c@) or+--   the dzen's default (@Nothing@). Both 'fg' and 'defFg'+--   are specializations of this function.+changeFg :: Transform a => Maybe DColour -> (a -> a)+changeFg c = transformSt $ \st ->+             if sFg st == c then (st, id)+             else (st {sFg = c}, parensF showFg c (sFg st))++-- | Like 'changeFg', but for the background colour.+changeBg :: Transform a => Maybe DColour -> (a -> a)+changeBg c = transformSt $ \st ->+             if sBg st == c then (st, id)+             else (st {sBg = c}, parensF showBg c (sBg st))+++++++-- Internal functions++-- | 'parens' with steroids.+parensF :: (a -> DString) -> a -> a -> DString -> DString+parensF f = \a b -> parens (f a) (f b)++-- | Change the foreground colour.+showFg :: Maybe DColour -> DString+showFg = mkCmd False "fg" . fromColour++-- | Change the background colour.+showBg :: Maybe DColour -> DString+showBg = mkCmd False "bg" . fromColour++-- | Lift 'sRGB24shows'.+fromColour :: (RealFrac a, Floating a) => Maybe (Colour a) -> String+fromColour = maybe "" sRGB24show

@@ -0,0 +1,124 @@+-- |+-- Module      :  System.Dzen.Graphics+-- Copyright   :  (c) 2009 Felipe A. Lessa+-- License     :  GPL 3 (see the LICENSE file in the distribution)+--+-- Maintainer  :  felipe.lessa@gmail.com+-- Stability   :  experimental+-- Portability :  semi-portable (uses MPTC and type families)+--+-- Support for the graphical abilities of @dzen@. Unfortunately+-- this is not the strongest are of @dzen@, so there isn't a lot+-- of functionality here, but there are \"bindings\" for every+-- function they provide.+--+-- You can draw:+--+-- [icons] With 'icon' (see @dzen@ documentation about formats and paths).+--+-- [rectanges] With 'rect' and 'rectO'.+--+-- [circles] With 'circ' and 'circO'.+--+-- Although it may seem that you can draw anything with the rectangle+-- primitive (i.e. in the worst case just use 1x1 rectangles to simulate+-- pixels), @dzen@ does not allow you to control the @y@ part of the+-- shapes, only the @x@ part (using 'pos' and 'absPos'): they are always+-- vertically centered.++module System.Dzen.Graphics+    (-- * Data types+     -- $dataTypes+     Width+    ,Height+    ,Radius++     -- * Icons+    ,icon++     -- * Shapes+    ,rect+    ,rectO+    ,circ+    ,circO++     -- * Positioning+    ,pos+    ,absPos++     -- * Misc+    ,ignoreBg+    )where++import Data.Monoid+import System.Dzen.Internal+import System.Dzen.Base+++-- $dataTypes+--+-- These data types are used to hint the purpose of+-- each argument, making the type signatures more clear.++type Width  = Int+type Height = Int+type Radius = Int+++-- | Draws an icon.+icon :: FilePath -> DString+icon = mkCmd True "i"+++-- | @rect w h@ draws and fills a rectangle of width @w@+--   and height @h@. The rectangle is vertically centered+--   (that is, if @h == 1@ then it is a centered line,+--    something like @----@).+rect :: Width -> Height -> DString+rect = mkCmdX "r"++-- | Like @rect@, but only draws and does not fills (i.e.+--   draws an outline).+rectO :: Width -> Height -> DString+rectO = mkCmdX "ro"++-- | Internal.+mkCmdX :: String -> Width -> Height -> DString+mkCmdX cmd w h = mkCmd True cmd (show w ++ 'x':show h)+++-- | @circ r@ draws and fils a circle of radius @r@, also+--   vertically centered.+circ :: Radius -> DString+circ = mkCmd True "c" . show++-- | Like @circ@, but does not fills.+circO :: Radius -> DString+circO = mkCmd True "co" . show+++-- | @pos p@ moves the position of the next input @p@ pixels+--   to the right. Note that @p@ may be negative, effectively+--   moving to the right.+pos :: Int -> DString+pos 0 = mempty+pos n = mkCmd True "p" (show n)++-- | @absPos p@ moves the position of the next input to be+--   exactly @p@ pixels to the right of the initial position.+--   This should be used with care.+absPos :: Int -> DString+absPos = mkCmd True "pa" . show+++-- | If @True@, the transformed @DString@ or @Printer@ will+--   ignore the background colour (i.e. it will draw over what+--   was already drawn). The default is @False@, the background+--   colour is used.+ignoreBg :: Transform a => Bool -> (a -> a)+ignoreBg ignore = transformSt $ \st ->+                  if sIgnoreBg st == ignore then (st, id)+                  else (st {sIgnoreBg = ignore},+                        parens (ib ignore) (ib $ sIgnoreBg st))+    where ib x = mkCmd False "ib" (if x then "1" else "0")+

@@ -0,0 +1,183 @@+-- |+-- Module      :  System.Dzen.Internal+-- Copyright   :  (c) 2009 Felipe A. Lessa+-- License     :  GPL 3 (see the LICENSE file in the distribution)+--+-- Maintainer  :  felipe.lessa@gmail.com+-- Stability   :  experimental+-- Portability :  semi-portable (MPTC and type families)+--+-- Internal data types and functions that are not exported+-- to the outside world.++module System.Dzen.Internal+    (-- * State+     DSt(..)+    ,DColour++     -- * DString+    ,DString(..)+    ,rawStr+    ,toString+    ,size+    ,mkCmd++     -- * Printer+    ,Printer(..)+    ,apply+    ,Transform(..)+    ) where+++import Control.Arrow+import Control.Monad+import Data.Colour+import Data.String+import Data.Monoid+++-- | The internal state we maintain. Currently it only contains+--   the foreground and the background colours and if we are+--   ignoring the background or not.+--+--   This state is passed around like a @Reader@ monad, each+--   function receives it and does whatever it want, and not+--   like a @State@ monad!+data DSt = S {sFg :: !(Maybe DColour)+             ,sBg :: !(Maybe DColour)+             ,sIgnoreBg :: !Bool}++-- | Our colours.+type DColour = Colour Double++-- | Empty state.+emptyState :: DSt+emptyState = S Nothing Nothing True++++++-- | A @DString@ is used for constant string output, see 'str'.+--   The @D@ on @DString@ stands for @dzen@, as these strings+--   may change depending on the state (and that's why you+--   shouldn't rely on 'Show', as it just uses an empty state)+newtype DString = DS {unDS :: DSt -> (String -> String, Maybe Int)}+-- A differencial list of chars (i.e. ShowS) and the number of chars.+--+-- Note that we use the @DStrings@ by themselves (i.e. concatenating+-- with @Printers@) and for output of the @Printers@, but state is+-- relevant only on the former. The @DString@s returned by Printers+-- always get passed the @emptyState@. Of course it would be better to+-- create two distinct data types, but we'll stick to this semantic+-- hole for now.++instance IsString DString where+    fromString = DS . const . escape 0++instance Show DString where+    show (DS ds) = concat ["<with empty state: ",+                           show ((fst $ ds emptyState) ""), ">"]++instance Monoid DString where+    mempty = DS $ const (id, Just 0)+    mappend (DS ds1) (DS ds2) = DS $ \st -> ds1 st # ds2 st+                        -- Note how we duplicate 'st' above+        where (s1,n1) # (s2,n2) = (s1 . s2, liftM2 (+) n1 n2)++escape :: Int -> String -> (String -> String, Maybe Int)+escape n s | n `seq` s `seq` False = error "escape: never here"+escape n ('^':xs) = first (t.t) $ escape (n+1) xs where t = (.) ('^':)+escape n ( x :xs) = first x'    $ escape (n+1) xs where x' = (.) (x:)+escape n []       = (id, Just n)+++-- | Converts a @String@ into a @DString@ without escaping anything.+--   You /really/ don't need to use this, trust me!+rawStr :: String -> DString+rawStr str = DS $ const ((str ++), Just $ length str)++-- | Converts a @DString@ back into a @String@. Note that+--   @(toString . rawStr)@ is not @id@, otherwise @toString@+--   would not work in some cases.+--   Probably you don't need to use this, unless you want+--   something like a static bar and nothing else.+toString :: DString -> String+toString = ("^ib(1)" ++) . ($ "") . fst . ($ emptyState) . unDS++-- | Tries to get the number of characters of the @DString@.+--   May return @Nothing@ when there are graphical objects.+--   Probably you don't need to use this function.+size :: DString -> Maybe Int+size = snd . ($ emptyState) . unDS+--   We apply a new empty state but that shouldn't be a problem+--   because currently all functions that depend on the state+--   do not change the size.++-- | @mkCmd graph cmd arg@ creates a command string like+--   @\"^cmd(arg)\"@. If @graph@ is @False@ then we give length zero+--   to the resulting @DString@, otherwise we don't give a length+--   (which propagates for strings concatenated to this). You should+--   use @False@ whenever possible.+mkCmd :: Bool -> String -> String -> DString+mkCmd graph cmd arg = DS $ const (str, len)+    where str = ('^':).(cmd++).('(':).(arg++).(')':)+          len = if graph then Nothing else Just 0+++-- | A printer is used when the output depends on an input, so a+--   @Printer a@ generates a 'DString' based on some input of+--   type @a@ (and possibly updates some internal state).+newtype Printer a = P {unP :: DSt -> a -> (DString, Printer a)}+-- We don't use a Reader just because we already have+-- to do a lot of pumbling ourselves anyway.++-- | Apply a printer to an appropriate input, returning+--   the output string and the new printer.+apply :: Printer a -> a -> (String, Printer a)+apply p i = first toString . ($ i) . ($ emptyState) . unP $ p+-- We have apply here in Internal because it uses 'emptyState',+-- which we don't want to export because its defaults are not+-- the same as dzen's defaults (we use "ib(1)" by default).+++-- | @Transform@ is a specialization of @Functor@ for @DString@s.+--   This class is used for functions that may receive @DString@+--   or @Printer a@ as an argument because they operate only+--   on their outputs and internal states (and not on the inputs).+--+--   So, whenever you see a function of type+--+--   > func :: Transform a => Blah -> Bleh -> a -> a+--+--   it means that @func@ can be used in two ways:+--+--   > func :: Blah -> Bleh -> DString -> DString+--   > func :: Blah -> Bleh -> Printer a -> Printer a  -- Printer of any input!+--+--   Try to have this in mind when reading the types.+--+--   Note: There is also a non-exported @transformSt@ for+--   transforming the state in this class, otherwise it would+--   be meaningless to use a class only for @transform@ (it+--   would be better to make @liftT :: (DString -> DString)+--   -> (Printer a -> Printer a)@).+class Transform a where+    -- | This function is 'id' on @DString@ and+    --   modifies the output of a @Printer a@.+    transform :: (DString -> DString) -> (a -> a)+    transform f = transformSt (\st -> (st, f))++    transformSt :: (DSt -> (DSt, DString -> DString)) -> (a -> a)++instance Transform DString where+    transform = id+    transformSt f ds = DS $ \st -> let (st', dsT) = f st+                                   in unDS (dsT ds) st'++instance Transform (Printer a) where+    transform f = P . (((f *** transform f) .) .) . unP+    transformSt f (P p) = P $ \st i -> let (st', dsT) = f st+                                           (ds, p') = p st' i+                                       in (dsT ds, transformSt f p')+

@@ -0,0 +1,169 @@+-- |+-- Module      :  System.Dzen.Padding+-- Copyright   :  (c) 2009 Felipe A. Lessa+-- License     :  GPL 3 (see the LICENSE file in the distribution)+--+-- Maintainer  :  felipe.lessa@gmail.com+-- Stability   :  experimental+-- Portability :  semi-portable (uses MPTC and type families)+--+-- This is a handy module with functions for manual and automatic+-- padding. To pad means to force the length of a string to be of a+-- minimum size by adding /padding characters/ on either or both sides+-- of the string (usually spaces). For example, padding the string+-- @\"123\"@ to have length of 10 characters would give us the string+--+-- > "       123"   -- if padding on the left+-- > "123       "   -- if padding on the right+-- > "    123   "   -- if padding on both sides+--+-- We provide two kinds of padding here:+--+-- [manual padding] This is the kind of padding you usually see+-- in other (non-@dzen@) libraries. You give them the type of+-- padding and the minimum length that you want and they will+-- give you back another string. The @pad*@ functions do this+-- with both plain @DString@s and with the output of @Printer@s.+--+-- [automatic padding] This is the same as a \"never shrink\"+-- padding. An automatic padder adjusts its minimum length+-- to be at least the greatest length it has seen so far, which+-- means that an auto-padded @Printer@ will never shrink its+-- size. This is very useful if you don't want everything swinging+-- on your bar everytime the bar is updated.+module System.Dzen.Padding+    (-- * Manual padding+     -- $padWarning+     padL+    ,padR+    ,padC+    ,pad+    ,PadWhere(..)++     -- * Automatic padding+     -- $autoPad+    ,autoPadL+    ,autoPadR+    ,autoPadC+    ,autoPad+    ) where++import System.Dzen.Internal+import System.Dzen.Base++-- $padWarning+--+-- Note that there are commands that generate graphical+-- outputs, such as 'System.Dzen.Graphics.rect', and we can't+-- tell how many \"characters\" a graphic object has.+-- Whenever you apply any of the padding functions below+-- to a @DString@ that contains one of these graphical+-- objects, there will be no padding. Note that colours+-- do not affect padding as they do not have any width+-- (and we don't mistake the command characters with+-- the characters that will be shown).++-- | Pads the given @DString@ or @Printer@ output+--   with spaces to be at least @n@ chars in length+padL :: Transform a => Int -> (a -> a)+padL = pad ' ' PadLeft++-- | Same as 'padL', but insert spaces on the right of the string.+padR :: Transform a => Int -> (a -> a)+padR = pad ' ' PadRight++-- | Same as 'padL', but insert spaces on both sides,+--   trying to keep the original contents in the middle.+padC :: Transform a => Int -> (a -> a)+padC = pad ' ' PadCenter++-- | Generic pad function, padding with any character+--   and in any place.+pad :: Transform a => Char -> PadWhere -> Int -> (a -> a)+pad c w n = transform $ DS . (pad' .) . unDS+    where+      pad' (string, Just k) | k < n =+          (case w of+             PadCenter -> repli (d+m) . string . repli d+             PadLeft   -> repli a . string+             PadRight  -> string . repli a, Just n)+          where a = n-k; (d,m) = a `divMod` 2+                repli = foldr (.) id . flip replicate (c:)+      pad' other = other++-- | Where to add the padding characters.+data PadWhere = PadLeft | PadRight | PadCenter++++++-- $autoPad+--+-- Automatic padding adjusts the number of padding characters+-- dinamically, increasing the pad everytime the string+-- size is greater than the pad size. For example, if+-- you give @autoPadL 3@ the following strings+--+-- > "1"+-- > "12"+-- > "123"+-- > "1234"+-- > "12345"+-- > "1234"+-- > "12"+-- > ""+--+-- then it will give the following outputs+--+-- > "  1"+-- > " 12"+-- > "123"+-- > "1234"+-- > "12345"+-- > " 1234"+-- > "   12"+-- > "     "+--+-- Using @autoPadC 3@ would give+--+-- > " 1 "+-- > " 12"+-- > "123"+-- > "1234"+-- > "12345"+-- > " 1234"+-- > "  12 "+-- > "     "+--+-- Some notes:+--+-- - If you're lazy you may give an initial number+--   of zero and after some inputs the padding will be fine.+--+-- - If the automatic pad finds out that there is a graphical+--   object at some string, then it will continue trying to+--   pad the next strings. Although normally the strings will+--   all contain graphics or not, we consider that the performance+--   loss is negligible (and we do what the user expects).++-- | Automatic padding for 'padL'.+autoPadL :: Int -> (Printer a -> Printer a)+autoPadL = autoPad ' ' PadLeft++-- | Automatic padding for 'padR'.+autoPadR :: Int -> (Printer a -> Printer a)+autoPadR = autoPad ' ' PadRight++-- | Automatic padding for 'padC'.+autoPadC :: Int -> (Printer a -> Printer a)+autoPadC = autoPad ' ' PadCenter++-- | Generic automatic padding function, analog to 'pad'.+autoPad :: Char -> PadWhere -> Int -> (Printer a -> Printer a)+autoPad c w n pr =+    P $ \st input -> let (output, pr') = unP pr st input+                         s = maybe 0 id $ size output+                     in case s `compare` n of+                          LT -> (pad c w n output, autoPad c w n pr')+                          _  -> (output,           autoPad c w s pr')

@@ -0,0 +1,115 @@+-- |+-- Module      :  System.Dzen.Process+-- Copyright   :  (c) 2009 Felipe A. Lessa+-- License     :  GPL 3 (see the LICENSE file in the distribution)+--+-- Maintainer  :  felipe.lessa@gmail.com+-- Stability   :  experimental+-- Portability :  semi-portable (uses MPTC and type families)+--+-- Functions for creating supplies and running @dzen@.++module System.Dzen.Process+    (-- * Simple interface+     runDzen+    ,(##)++     -- * Powerful interface+    ,createDzen+    ,createDzen'+    ) where++import Control.Concurrent+import Control.Monad+import Data.Function+import System.IO+import System.Process hiding (proc)+import System.Dzen.Base+++-- | Pipes a 'Printer' to a fresh instance of @dzen@. It runs+--   the following commands:+--+--   (1) Start @dzen@ with the supplied executable and arguments.+--+--   (2) Call the supply to get an input.+--+--   (3) Apply the input to the printer.+--+--   (4) Write the printer's output to @dzen@'s standard input.+--+--   (5) Sleeps for the specified delay using 'threadDelay'.+--+--   (6) Go back to step 2.+--+--   You may want to use this function inside a 'forkIO' if,+--   for example, you're inside @xmonad@.+runDzen :: FilePath  -- ^ Path to @dzen@ executable, probably @\"dzen2\"@+        -> [String]  -- ^ Arguments for @dzen@.+        -> Int       -- ^ Delay between suplies in milliseconds. May be zero.+        -> Printer a -- ^ @Printer@ to be used.+        -> IO a      -- ^ Supply of inputs.+        -> IO ()+runDzen path args delay printer get = do+  handle <- createDzen' path args+  let put s = hPutStrLn handle s >> threadDelay (delay * 1000)+  applyForever printer get put++++-- | This is the same as @liftM2 (,)@, but with as a convenient+--   operator with right infixity (the same as '+++').  For example,+--   suppose you have printers+--+--   > prA :: Printer a+--   > prB :: Printer b+--   > prC :: Printer c+--+--   and supply functions+--+--   > getA :: m a+--   > getB :: m b+--   > getC :: m c+--+--   for some monad @m@. The final printer+--+--   > prFinal = prA +++ prB +++ prC+--+--   will be of type @Printer (a,(b,c))@, so you may use+--   as its supply function+--+--   > getFinal = getA ## getB ## getC+--+--   which is of type @m (a,(b,c))@.+(##) :: Monad m => m a -> m b -> m (a,b)+(##) = liftM2 (,)++infixr 4 ##++-- | Runs a @dzen@ instance and returns its @stdin@ pipe.+--   Both @stdout@ and @stderr@ of the new process will+--   be the same as this process'. The pipe returned is+--   already line buffered.+--+--   The first string is interpreted as a shell command+--   to start @dzen@. Some examples of usage:+--+--   > createDzen (RawCommand "dzen2" ["-p"])+--   > createDzen (ShellCommand "dzen2 -l 8 -bg #331100")+createDzen :: CmdSpec -> IO Handle+createDzen cmd = createProcess proc >>= extract+    where proc = (shell "") {cmdspec   = cmd+                            ,std_in    = CreatePipe+                            ,std_out   = Inherit+                            ,std_err   = Inherit}+          extract (Just handle, Nothing, Nothing, _) = do+            hSetBuffering handle LineBuffering+            return handle+          extract _ = do+              fail "createDzen: extract: (un)expected pipes"++-- | Like @createDzen@, but never uses a shell (which is good).+createDzen' :: FilePath -- ^ @dzen@ executable, likely @\"dzen2\"@+            -> [String] -- ^ Arguments to @dzen@.+            -> IO Handle+createDzen' = (createDzen .) . RawCommand

@@ -0,0 +1,40 @@+cabal-version:       >= 1.2.3+name:                dzen-utils+version:             0.1+synopsis:            Utilities for creating inputs for dzen.+category:            System+license:             GPL+license-file:        LICENSE+author:              Felipe Almeida Lessa+copyright:           (c) 2009 Felipe A. Lessa+maintainer:          felipe.lessa@gmail.com+build-type:          Simple+tested-with:         GHC+extra-source-files:  Example1.hs, Example2.hs+description:+  This library has everything you need to create your @dzen@'s+  bar input strings using powerful combinators in a type-safe way.+  .+  It can be used to create standalone \"scripts\" with @runhaskell@+  or it can be used inside @xmonad@'s main function.+  .+  To see what can be done, please read the documentation of the+  toplevel module "System.Dzen".++library+  build-depends:     base >= 4, colour >= 2.2, process >= 1.0+  ghc-options:       -Wall+  extensions:+    MultiParamTypeClasses,+    OverloadedStrings,+    TypeFamilies+  exposed-modules:+    System.Dzen,+    System.Dzen.Base,+    System.Dzen.Colour,+    System.Dzen.Graphics,+    System.Dzen.Padding,+    System.Dzen.Bars,+    System.Dzen.Process+  other-modules:+    System.Dzen.Internal