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dist
dist-*
cabal-dev
*.o
*.hi
*.hie
*.chi
*.chs.h
*.dyn_o
*.dyn_hi
.hpc
.hsenv
.cabal-sandbox/
cabal.sandbox.config
*.prof
*.aux
*.hp
*.eventlog
.stack-work/
cabal.project.local
cabal.project.local~
.HTF/
.ghc.environment.*

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# Revision history for suntheme
## 0.1.0 -- YYYY-mm-dd
* First version. Released on an unsuspecting world.

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GNU GENERAL PUBLIC LICENSE
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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>.

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-- requires 'at' for running a command at a certain time
-- requires 'date' for converting unix time to human readable time
-- run on boot and at noon and midnight
-- don't add commands to at while this script is running (monadic purity must be preserved)
module Main where
import Data.Time (ZonedTime, getCurrentTime)
import Data.Time.Solar (Location(Location), sunrise, sunset)
import Data.Time.RFC3339 (formatTimeRFC3339)
import Data.Time.LocalTime (getTimeZone, utcToZonedTime, zonedTimeToUTC)
import Data.List.Extra ((!?))
import Data.ByteString.Char8 (unpack)
import System.Exit (ExitCode(ExitFailure), exitWith)
import System.Process (readProcess)
import System.FilePath ((</>), takeDirectory)
import System.Directory (XdgDirectory(XdgCache, XdgConfig), createDirectoryIfMissing, doesFileExist, getXdgDirectory)
import Control.Exception (SomeException, catch, try)
import Network.HTTP.Request (Response(responseBody, responseStatus), get)
-- error handling
-- refactor into modules
-- clean up jank (reduce lines in functions, more atomic/functional, etc)
-- eliminate as many do blocks as possible
-- introduce liquid types and checking
-- whitepaper!
class Status s where
ok :: s -> Bool
ok = const False
disp :: s -> String
disp = const "encountered bad response (expected OK)"
newtype ResponseCode = ResponseCode Int
instance Status ResponseCode where
ok (ResponseCode code) = code == 200
disp (ResponseCode code) =
"encountered bad response code: "
++ show code
++ " (expected 200 'OK')"
newtype ResponseMsg = ResponseMsg String
instance Status ResponseMsg where
ok (ResponseMsg msg) = msg == "success"
disp (ResponseMsg msg) =
"encountered bad response message: "
++ msg
++ " (expected 'success')"
toResponseMsg :: SomeException -> ResponseMsg
toResponseMsg = ResponseMsg . show
query :: String
query = "http://ip-api.com/line/?fields=status,lat,lon,timezone"
genericErr :: ResponseMsg
genericErr = ResponseMsg "encountered unknown error"
prog :: String
prog = "suntheme"
lightModeScript :: String
lightModeScript = "light.sh"
darkModeScript :: String
darkModeScript = "dark.sh"
now :: IO ZonedTime
now = do
utcTime <- getCurrentTime
timeZone <- getTimeZone utcTime
return (utcToZonedTime timeZone utcTime)
sunriseNow :: Double -> Double -> IO ZonedTime
sunriseNow lat lon = do
time <- now
return (sunrise time here)
where here = Location lat lon
sunsetNow :: Double -> Double -> IO ZonedTime
sunsetNow lat lon = do
time <- now
return (sunset time here)
where here = Location lat lon
pathToCache :: String -> IO String
pathToCache str = do
dir <- getXdgDirectory XdgCache prog
return (dir </> str)
pathToConfig :: String -> IO String
pathToConfig str = do
dir <- getXdgDirectory XdgConfig prog
return (dir </> str)
fetch :: String -> IO (Either SomeException Response)
fetch = try . get
cont :: (Status s) => s -> IO () -> IO ()
cont e err = (putStrLn . disp) e >> err
destruct :: (Status s) => s -> IO () -> IO () -> IO ()
destruct status success failure
| ok status = success
| otherwise = cont status failure
ping :: (Response -> IO ()) -> IO () -> IO ()
ping run err = do
res <- fetch query
case res of
Left e -> cont (toResponseMsg e) err
Right r ->
let status = (ResponseCode . responseStatus) r
runner = run r
in destruct status runner err
readLines :: [String] -> Maybe (String, Double, Double, String)
readLines [msg, latStr, lonStr, tz] = Just (msg, read latStr, read lonStr, tz)
readLines _ = Nothing
process :: Response -> (Double -> Double -> String -> IO ()) -> IO () -> IO ()
process r run err =
case info of
Nothing -> cont genericErr err
Just (msg, lat, lon, tz) ->
let status = ResponseMsg msg
runner = run lat lon tz
in destruct status runner err
where
body = responseBody r
parts = (lines . unpack) body
info = (readLines . take 4) parts
dumpCache :: Double -> Double -> String -> IO ()
dumpCache lat lon tz = do
cache <- pathToCache "data.txt"
catch (writer cache) failure
prepareScripts lat lon
where
writer dir = writeFile dir (show lat ++ "\n" ++ show lon ++ "\n" ++ tz)
failure = print :: SomeException -> IO ()
readCache :: IO (Maybe (Double, Double, String))
readCache = do
cache <- pathToCache "data.txt"
contents <- readFile cache
let entries = lines contents
case (entries !? 0, entries !? 1, entries !? 2) of
(Just lat, Just lon, Just tz) -> return (Just (read lat, read lon, tz))
_ -> return Nothing
processRunner :: Response -> IO ()
processRunner r = process r dumpCache backupRunner
crash :: IO ()
crash = exitWith (ExitFailure 1)
backupRunner :: IO ()
backupRunner = do
contents <- readCache
case contents of
Nothing -> do
putStrLn "Failed to read cache after IP location failed"
crash
Just (lat, lon, _) -> prepareScripts lat lon
exec :: String -> (SomeException -> IO String) -> IO String
exec cmd err = do catch (readProcess "bash" ["-c", cmd] "") err
kill :: String -> String
kill = (++) "atrm "
killall :: [String] -> IO ()
killall = foldr ((>>) . dispatch . kill) (return ())
where
dispatch cmd = exec cmd failure
failure :: SomeException -> IO String
failure e = print e >> return []
start :: IO () -> IO ()
start act = do
logFile <- pathToCache "log.txt"
existsLog <- doesFileExist logFile
if existsLog then do
contents <- readFile logFile
let entries = lines contents
killall entries
else createDirectoryIfMissing True (takeDirectory logFile)
act
finish :: String -> IO ()
finish queue = do
cache <- pathToCache "log.txt"
catch (writeFile cache num) failure
where
num = getId queue
getId = head . words . last . lines
failure = print :: SomeException -> IO ()
after :: (Eq a) => a -> [a] -> [a]
after c = drop 1 . dropWhile (/= c)
formatTime :: ZonedTime -> String
formatTime = take 5 . after 'T' . formatTimeRFC3339
buildCmd :: String -> ZonedTime -> String
buildCmd script time = "echo \"" ++ script ++ "\" | at " ++ formatTime time
activateOnSunrise :: ZonedTime -> ZonedTime -> IO Bool
activateOnSunrise sunriseTime sunsetTime = do
timeNow <- now
let utcTimeNow = zonedTimeToUTC timeNow
utcSunrise = zonedTimeToUTC sunriseTime
utcSunset = zonedTimeToUTC sunsetTime
if utcTimeNow < utcSunrise || utcTimeNow > utcSunset then return True
else return False
prepareScripts :: Double -> Double -> IO ()
prepareScripts lat lon = do
sunriseTime <- sunriseNow lat lon
sunsetTime <- sunsetNow lat lon
lightMode <- activateOnSunrise sunriseTime sunsetTime
_ <- if lightMode then do
putStr "Light mode activation script scheduled for "
print sunriseTime
script <- pathToConfig lightModeScript
exec (buildCmd script sunriseTime) terminate
else do
putStrLn "Dark mode activation script scheduled for "
print sunsetTime
script <- pathToConfig darkModeScript
exec (buildCmd script sunsetTime) terminate
queue <- exec "atq" noQueue
finish queue
where
terminate _ = print "Scheduling process failed" >> return ""
noQueueMsg = "Scheduled process could not be retrieved (try rerunning if 'atq' fails)"
noQueue _ = print noQueueMsg >> return ""
routine :: IO ()
routine = ping processRunner backupRunner
main :: IO ()
main = start routine

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cabal-version: 3.4
-- The cabal-version field refers to the version of the .cabal specification,
-- and can be different from the cabal-install (the tool) version and the
-- Cabal (the library) version you are using. As such, the Cabal (the library)
-- version used must be equal or greater than the version stated in this field.
-- Starting from the specification version 2.2, the cabal-version field must be
-- the first thing in the cabal file.
-- Initial package description 'suntheme' generated by
-- 'cabal init'. For further documentation, see:
-- http://haskell.org/cabal/users-guide/
--
-- The name of the package.
name: suntheme
-- The package version.
-- See the Haskell package versioning policy (PVP) for standards
-- guiding when and how versions should be incremented.
-- https://pvp.haskell.org
-- PVP summary: +-+------- breaking API changes
-- | | +----- non-breaking API additions
-- | | | +--- code changes with no API change
version: 0.1.0.0
-- A short (one-line) description of the package.
synopsis: Run a script automatically at sunrise or sunset
-- A longer description of the package.
-- description:
-- The license under which the package is released.
license: GPL-3.0-or-later
-- The file containing the license text.
license-file: LICENSE
-- The package author(s).
author: Ananth Venkatesh
-- An email address to which users can send suggestions, bug reports, and patches.
maintainer: dev.quantum9innovation@gmail.com
-- A copyright notice.
-- copyright:
category: System
build-type: Simple
-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
extra-doc-files: CHANGELOG.md
-- Extra source files to be distributed with the package, such as examples, or a tutorial module.
-- extra-source-files:
common warnings
ghc-options: -Wall
executable suntheme
-- Import common warning flags.
import: warnings
-- .hs or .lhs file containing the Main module.
main-is: Main.hs
-- Modules included in this executable, other than Main.
-- other-modules:
-- LANGUAGE extensions used by modules in this package.
-- other-extensions:
-- Other library packages from which modules are imported.
build-depends: base ^>=4.17.2.1,
request ^>=0.2.2.0,
process ^>=1.6.18.0,
bytestring ^>=0.11.5.3,
filepath ^>=1.4.2.2,
time ^>=1.9.3,
solar ^>=0.1.0.0,
timerep ^>=2.1.0.0,
extra ^>=1.7.16,
directory ^>=1.3.8.5
-- Directories containing source files.
hs-source-dirs: app
-- Base language which the package is written in.
default-language: Haskell2010