Make UnicodeData.txt path configurable, remove unsafePerformIO in favour

of ExtensibleState

Add facility to type Unicode character via xdotool

CHANGES.md

@@ -32,6 +32,11 @@
      sending messages to `Minimized` layout. `XMonad.Hooks.RestoreMinimized` has
      been completely deprecated, and its functions have no effect.
 
+  * `XMonad.Prompt.Unicode`
+
+    - `unicodePrompt :: String -> XPConfig -> X ()` now additionally takes a
+      filepath to the `UnicodeData.txt` file containing unicode data.
+
 ### New Modules
 
   * `XMonad.Hooks.Focus`
@@ -145,6 +150,16 @@
 
     - Update logout key combination (modm+shift+Q) to work with modern
 
+  * `XMonad.Prompt.Unicode`
+
+    - Persist unicode data cache across XMonad instances due to
+      `ExtensibleState` now used instead of `unsafePerformIO`.
+    - `typeUnicodePrompt :: String -> XPConfig -> X ()` provided to insert the
+      Unicode character via `xdotool` instead of copying it to the paste buffer.
+    - `mkUnicodePrompt :: String -> [String] -> String -> XPConfig -> X ()`
+      acts as a generic function to pass the selected Unicode character to any
+      program.
+
 ## 0.13 (February 10, 2017)
 
 ### Breaking Changes

XMonad/Prompt/Unicode.hs

@@ -1,6 +1,7 @@
 {- |
 Module      :  XMonad.Prompt.Unicode
 Copyright   :  (c) 2016 Joachim Breitner
+                   2017 Nick Hu
 License     :  BSD-style (see LICENSE)
 
 Maintainer  :  <mail@joachim-breitner.de>
@@ -9,14 +10,18 @@ Stability   :  stable
 A prompt for searching unicode characters by name and inserting them into
 the clipboard.
 
-Requires the file @\/usr\/share\/unicode\/UnicodeData.txt@ (shipped in the package
-@unicode-data@ on Debian) and the @xsel@ tool.
+The provided @unicodePrompt@ and @typeUnicodePrompt@ use @xsel@ and @xdotool@
+respectively.
 -}
 
+{-# LANGUAGE DeriveDataTypeable #-}
+
 module XMonad.Prompt.Unicode (
  -- * Usage
  -- $usage
- unicodePrompt
+ unicodePrompt,
+ typeUnicodePrompt,
+ mkUnicodePrompt
  ) where
 
 import qualified Data.ByteString.Char8 as BS
@@ -33,9 +38,23 @@ import Data.List
 import Text.Printf
 
 import XMonad
+import qualified XMonad.Util.ExtensibleState as XS
 import XMonad.Util.Run
 import XMonad.Prompt
 
+data Unicode = Unicode
+instance XPrompt Unicode where
+  showXPrompt Unicode = "Unicode: "
+  commandToComplete Unicode s = s
+  nextCompletion Unicode = getNextCompletion
+
+newtype UnicodeData = UnicodeData { getUnicodeData :: [(Char, BS.ByteString)] }
+  deriving (Typeable, Read, Show)
+
+instance ExtensionClass UnicodeData where
+  initialValue = UnicodeData []
+  extensionType = StateExtension
+
 {- $usage
 
 You can use this module by importing it, along with
@@ -46,54 +65,61 @@ You can use this module by importing it, along with
 
 and adding an appropriate keybinding, for example:
 
->  , ((modm .|. controlMask, xK_u), unicodePrompt def)
+>  , ((modm .|. controlMask, xK_u), unicodePrompt "/path/to/unicode-data" def)
 
+More flexibility is given by the @mkUnicodePrompt@ function, which takes a
+command and a list of arguments to pass as its first two arguments. See
+@unicodePrompt@ for details.
 -}
 
-unicodeDataFilename :: String
-unicodeDataFilename =  "/usr/share/unicode/UnicodeData.txt"
-
-entries :: [(Char, BS.ByteString)]
-entries = unsafePerformIO $ do
-    datE <- tryIOError $ BS.readFile unicodeDataFilename
-    case datE of
-        Left e -> do
-            hPutStrLn stderr $ "Could not read file \"" ++ unicodeDataFilename ++ "\""
-            hPutStrLn stderr $ show e
-            hPutStrLn stderr $ "Do you have unicode-data installed?"
-            return []
-        Right dat -> return $ sortBy (comparing (BS.length . snd)) $ parseUnicodeData dat
-{-# NOINLINE entries #-}
+populateEntries :: String -> X Bool
+populateEntries unicodeDataFilename = do
+  entries <- fmap getUnicodeData (XS.get :: X UnicodeData)
+  if null entries
+    then do
+      datE <- liftIO . tryIOError $ BS.readFile unicodeDataFilename
+      case datE of
+        Left e -> liftIO $ do
+          hPutStrLn stderr $ "Could not read file \"" ++ unicodeDataFilename ++ "\""
+          hPrint stderr e
+          hPutStrLn stderr "Do you have unicode-data installed?"
+          return False
+        Right dat -> do
+          XS.put . UnicodeData . sortBy (comparing (BS.length . snd)) $ parseUnicodeData dat
+          return True
+    else return True
 
 parseUnicodeData :: BS.ByteString -> [(Char, BS.ByteString)]
 parseUnicodeData = mapMaybe parseLine . BS.lines
-  where
-    parseLine l = do
-        field1 : field2 : _ <- return $ BS.split ';' l
-        [(c,"")] <- return $ readHex (BS.unpack field1)
-        return (chr c, field2)
+  where parseLine l = do
+          field1 : field2 : _ <- return $ BS.split ';' l
+          [(c,"")] <- return . readHex $ BS.unpack field1
+          return (chr c, field2)
 
-searchUnicode :: String -> [(Char, String)]
-searchUnicode s = map (second BS.unpack) $ filter go entries
-  where w = map BS.pack $  filter (all isAscii) $ filter ((> 1) . length) $ words $ map toUpper s
+searchUnicode :: [(Char, BS.ByteString)] -> String -> [(Char, String)]
+searchUnicode entries s = map (second BS.unpack) $ filter go entries
+  where w = map BS.pack . filter (all isAscii) . filter ((> 1) . length) . words $ map toUpper s
         go (c,d) = all (`BS.isInfixOf` d) w
 
--- | Prompt the user for a unicode character to be inserted into the paste buffer of the X server.
-unicodePrompt :: XPConfig -> X ()
-unicodePrompt config = mkXPrompt Unicode config unicodeCompl paste
+mkUnicodePrompt :: String -> [String] -> String -> XPConfig -> X ()
+mkUnicodePrompt prog args unicodeDataFilename config =
+  whenX (populateEntries unicodeDataFilename) $ do
+    entries <- fmap getUnicodeData (XS.get :: X UnicodeData)
+    mkXPrompt Unicode config (unicodeCompl entries) paste
   where
-    unicodeCompl [] = return []
-    unicodeCompl s = do
-        return $ map (\(c,d) -> printf "%s %s" [c] d) $ take 20 $ searchUnicode s
-
+    unicodeCompl _ [] = return []
+    unicodeCompl entries s = do
+      let m = searchUnicode entries s
+      return . map (\(c,d) -> printf "%s %s" [c] d) $ take 20 m
     paste [] = return ()
     paste (c:_) = do
-        runProcessWithInput "xsel" ["-i"] [c]
-        return ()
+      runProcessWithInput prog args [c]
+      return ()
 
-data Unicode = Unicode
-instance XPrompt Unicode where
-    showXPrompt Unicode = "Unicode: "
-    commandToComplete Unicode s = s
-    nextCompletion Unicode = getNextCompletion
+-- | Prompt the user for a Unicode character to be inserted into the paste buffer of the X server.
+unicodePrompt :: String -> XPConfig -> X ()
+unicodePrompt = mkUnicodePrompt "xsel" ["-i"]
 
+-- | Prompt the user for a Unicode character to be typed by @xdotool@.
+typeUnicodePrompt :: String -> XPConfig -> X ()
+typeUnicodePrompt = mkUnicodePrompt "xdotool" ["type", "--clearmodifiers", "--file", "-"]