#!/usr/bin/env nix-script
#!>haskell
#! shell   | bup git
#! env     | BUP_DIR
#! haskell | shell-conduit filepath

import Data.List (intersperse)
import Data.Conduit.Shell
import Data.Conduit.Shell.Segments (strings)
import Data.Conduit.Shell.Variadic (variadicProcess)
import System.FilePath


excluded :: [String]
excluded = intersperse "--exclude"
  [ "/home/rnhmjoj/.cache/"
  , "/home/rnhmjoj/games/"
  ]


main :: IO ()
main = run (strings (bup "ls") >>= mapM_ backup)


findPath :: String -> Segment FilePath
findPath path = do
  files <- strings (bup "ls" path)
  if length files /= 1
    then return ("/" </> final path)
    else findPath (path </> head files)
  where final = concat . drop 2 . splitPath


backup :: String -> Segment ()
backup name = do
  path <- findPath (name </> "latest")
  proc "bup" ("index" : "-v" : path : "--exclude" : excluded)
  bup "save" "-n" name path


bup :: ProcessType r => String -> r
bup = variadicProcess "bup"