From 77df1ac30fa7af5948f7ff64f5fee9aed64552b3 Mon Sep 17 00:00:00 2001
From: jao <jao@gnu.org>
Date: Sun, 25 Nov 2018 15:10:29 +0000
Subject: Back to app/src, since it seems they're the default convention for
 stack

---
 src/Xmobar/Plugins/Monitors/Bright.hs | 99 +++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 src/Xmobar/Plugins/Monitors/Bright.hs

(limited to 'src/Xmobar/Plugins/Monitors/Bright.hs')

diff --git a/src/Xmobar/Plugins/Monitors/Bright.hs b/src/Xmobar/Plugins/Monitors/Bright.hs
new file mode 100644
index 0000000..fe72219
--- /dev/null
+++ b/src/Xmobar/Plugins/Monitors/Bright.hs
@@ -0,0 +1,99 @@
+-----------------------------------------------------------------------------
+---- |
+---- Module      :  Plugins.Monitors.Birght
+---- Copyright   :  (c) Martin Perner
+---- License     :  BSD-style (see LICENSE)
+----
+---- Maintainer  :  Martin Perner <martin@perner.cc>
+---- Stability   :  unstable
+---- Portability :  unportable
+----
+----  A screen brightness monitor for Xmobar
+----
+-------------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Bright (brightConfig, runBright) where
+
+import Control.Applicative ((<$>))
+import Control.Exception (SomeException, handle)
+import qualified Data.ByteString.Lazy.Char8 as B
+import System.FilePath ((</>))
+import System.Posix.Files (fileExist)
+import System.Console.GetOpt
+
+import Xmobar.Plugins.Monitors.Common
+
+data BrightOpts = BrightOpts { subDir :: String
+                             , currBright :: String
+                             , maxBright :: String
+                             , curBrightIconPattern :: Maybe IconPattern
+                             }
+
+defaultOpts :: BrightOpts
+defaultOpts = BrightOpts { subDir = "acpi_video0"
+                         , currBright = "actual_brightness"
+                         , maxBright = "max_brightness"
+                         , curBrightIconPattern = Nothing
+                         }
+
+options :: [OptDescr (BrightOpts -> BrightOpts)]
+options = [ Option "D" ["device"] (ReqArg (\x o -> o { subDir = x }) "") ""
+          , Option "C" ["curr"] (ReqArg (\x o -> o { currBright = x }) "") ""
+          , Option "M" ["max"] (ReqArg (\x o -> o { maxBright = x }) "") ""
+          , Option "" ["brightness-icon-pattern"] (ReqArg (\x o ->
+             o { curBrightIconPattern = Just $ parseIconPattern x }) "") ""
+          ]
+
+-- from Batt.hs
+parseOpts :: [String] -> IO BrightOpts
+parseOpts argv =
+  case getOpt Permute options argv of
+    (o, _, []) -> return $ foldr id defaultOpts o
+    (_, _, errs) -> ioError . userError $ concat errs
+
+sysDir :: FilePath
+sysDir = "/sys/class/backlight/"
+
+brightConfig :: IO MConfig
+brightConfig = mkMConfig "<percent>" -- template
+                         ["vbar", "percent", "bar", "ipat"] -- replacements
+
+data Files = Files { fCurr :: String
+                   , fMax :: String
+                   }
+           | NoFiles
+
+brightFiles :: BrightOpts -> IO Files
+brightFiles opts = do
+  is_curr <- fileExist $ fCurr files
+  is_max  <- fileExist $ fCurr files
+  return (if is_curr && is_max then files else NoFiles)
+  where prefix = sysDir </> subDir opts
+        files = Files { fCurr = prefix </> currBright opts
+                      , fMax = prefix </> maxBright opts
+                      }
+
+runBright :: [String] ->  Monitor String
+runBright args = do
+  opts <- io $ parseOpts args
+  f <- io $ brightFiles opts
+  c <- io $ readBright f
+  case f of
+    NoFiles -> return "hurz"
+    _ -> fmtPercent opts c >>= parseTemplate
+  where fmtPercent :: BrightOpts -> Float -> Monitor [String]
+        fmtPercent opts c = do r <- showVerticalBar (100 * c) c
+                               s <- showPercentWithColors c
+                               t <- showPercentBar (100 * c) c
+                               d <- showIconPattern (curBrightIconPattern opts) c
+                               return [r,s,t,d]
+
+readBright :: Files -> IO Float
+readBright NoFiles = return 0
+readBright files = do
+  currVal<- grab $ fCurr files
+  maxVal <- grab $ fMax files
+  return (currVal / maxVal)
+  where grab f = handle handler (read . B.unpack <$> B.readFile f)
+        handler = const (return 0) :: SomeException -> IO Float
+
-- 
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