From 8287e45b62d0d310512574850bad4741c4b3a53d Mon Sep 17 00:00:00 2001
From: Michal Zielonka <michal.zielonka.8001@gmail.com>
Date: Mon, 11 Oct 2021 23:11:30 +0200
Subject: add top for freebsd proc

In FreeBSD /proc/pid/stat is missing we should use for top procstat
library.
---
 src/Xmobar/Plugins/Monitors/Top/Linux.hs | 92 ++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/Xmobar/Plugins/Monitors/Top/Linux.hs

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

diff --git a/src/Xmobar/Plugins/Monitors/Top/Linux.hs b/src/Xmobar/Plugins/Monitors/Top/Linux.hs
new file mode 100644
index 0000000..715a7cd
--- /dev/null
+++ b/src/Xmobar/Plugins/Monitors/Top/Linux.hs
@@ -0,0 +1,92 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Top.Linux
+-- Copyright   :  (c) 2010, 2011, 2012, 2013, 2014, 2018 Jose A Ortega Ruiz
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+--  Process activity and memory consumption monitors
+--
+-----------------------------------------------------------------------------
+
+{-# LANGUAGE ForeignFunctionInterface #-}
+
+module Xmobar.Plugins.Monitors.Top.Linux (
+  timeMemEntries
+  , meminfos
+  , scale) where
+
+import Xmobar.Plugins.Monitors.Common (parseFloat, parseInt)
+import Xmobar.Plugins.Monitors.Top.Common (MemInfo, TimeEntry)
+
+import Control.Exception (SomeException, handle)
+import Data.List (foldl')
+import System.Directory (getDirectoryContents)
+import System.FilePath ((</>))
+import System.IO (IOMode(ReadMode), hGetLine, withFile)
+import System.Posix.Unistd (SysVar(ClockTick), getSysVar)
+
+import Foreign.C.Types
+
+foreign import ccall "unistd.h getpagesize"
+  c_getpagesize :: CInt
+
+pageSize :: Float
+pageSize = fromIntegral c_getpagesize / 1024
+
+processes :: IO [FilePath]
+processes = fmap (filter isPid) (getDirectoryContents "/proc")
+  where isPid = (`elem` ['0'..'9']) . head
+
+statWords :: [String] -> [String]
+statWords line@(x:pn:ppn:xs) =
+  if last pn == ')' then line else statWords (x:(pn ++ " " ++ ppn):xs)
+statWords _ = replicate 52 "0"
+
+getProcessData :: FilePath -> IO [String]
+getProcessData pidf =
+  handle ign $ withFile ("/proc" </> pidf </> "stat") ReadMode readWords
+  where readWords = fmap (statWords . words) . hGetLine
+        ign = const (return []) :: SomeException -> IO [String]
+
+memPages :: [String] -> String
+memPages fs = fs!!23
+
+ppid :: [String] -> String
+ppid fs = fs!!3
+
+skip :: [String] -> Bool
+skip fs = length fs < 24 || memPages fs == "0" || ppid fs == "0"
+
+handleProcesses :: ([String] -> a) -> IO [a]
+handleProcesses f =
+  fmap (foldl' (\a p -> if skip p then a else f p : a) [])
+       (processes >>= mapM getProcessData)
+
+processName :: [String] -> String
+processName = drop 1 . init . (!!1)
+
+meminfo :: [String] -> MemInfo
+meminfo fs = (processName fs, pageSize * parseFloat (fs!!23))
+
+meminfos :: IO [MemInfo]
+meminfos = handleProcesses meminfo
+
+timeMemEntry :: [String] -> (TimeEntry, MemInfo)
+timeMemEntry fs = ((p, (n, t)), (n, r))
+  where p = parseInt (head fs)
+        n = processName fs
+        t = parseFloat (fs!!13) + parseFloat (fs!!14)
+        (_, r) = meminfo fs
+
+timeMemEntries :: IO [(TimeEntry, MemInfo)]
+timeMemEntries = handleProcesses timeMemEntry
+
+
+scale :: IO Float
+scale = do
+  cr <- getSysVar ClockTick
+  return $ fromIntegral cr / 100
-- 
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