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{-# LANGUAGE DoAndIfThenElse #-}
{-# LANGUAGE UnicodeSyntax #-}
module XMonad.Local.Prompt (
digraphPrompt,
getDigraphForString
) where
import Control.Exception
import Control.Monad
import System.Directory
import System.IO
import qualified System.IO.Temp as Temp
import XMonad
import XMonad.Prompt
-- local modules **************************************************************
import qualified XMonad.Local.Config as Local
import qualified XMonad.Local.Util as Local
-- digraph prompt *************************************************************
data Digraph = Digraph
instance XPrompt Digraph where
showXPrompt Digraph = "Two ASCII characters: "
-- | According to RFC 1345
digraphChars ∷ String
digraphChars = "!\"%'()*+,-./0123456789:;<=>?"
++ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
digraphCompletionFunction ∷ String → IO [String]
digraphCompletionFunction = return . gen
where
gen ∷ String → [String]
gen [] = [x:"?" | x <- digraphChars]
gen [x] | x `elem` digraphChars = [[x, y] | y <- '_':digraphChars]
| otherwise = []
gen [x, y] | x `elem` digraphChars
&& y `elem` ('_':digraphChars) = [[x, y]]
| otherwise = []
gen _ = []
vimEchoDigraphConfig ∷ String
vimEchoDigraphConfig = unlines [
"set noswapfile",
"set nocompatible",
"filetype off",
"\" load unicode plugin for unicode#Digraph function",
"set rtp+=" ++ Local.vimBundlePath,
"call vundle#begin()",
"Plugin 'chrisbra/unicode.vim'",
"call vundle#end()"]
vimBinary ∷ String
vimBinary = "/usr/bin/vim"
-- |
-- TODO: make it vim independent
getDigraphForString ∷ String → X String
getDigraphForString str = io $
Temp.withSystemTempFile "xminad-digraph-config.vimrc" $ \filePath h ->
finally (runVim filePath h) (removeFile filePath)
where
cmdMkDigraph = "+call setline(1, unicode#Digraph(getline(1)[0:1]))"
cmdWriteAndQuit = "+w!/dev/stderr|q!"
runVim ∷ FilePath → Handle → IO String
runVim filePath h = do
finally (hPutStr h vimEchoDigraphConfig) (hClose h)
(_, dg) <- Local.runProcessAndGetOutputs vimBinary
["-", "-esbu", filePath, cmdMkDigraph, cmdWriteAndQuit]
str
when (null dg) (hPrint stderr $ "failed to get digraph for input '" ++ str ++ "'\n")
return dg
-- | Prompts for two characters and passes them to vim to get corresponding
-- digraph.
-- NOTE: Even if return value is Just, the string may still be empty if the
-- vim couldn't make digraph out of the input.
digraphPrompt ∷ X (Maybe String)
digraphPrompt = catchX
(mkXPromptWithReturn Digraph
Local.xpConfig digraphCompletionFunction getDigraphForString)
(io $ return Nothing)
|
