place-cursor-at (empty) → 1.0.0

raw patch · 5 files changed

+1539/−0 lines, 5 filesdep +X11dep +basedep +base-unicode-symbolssetup-changed

Dependencies added: X11, base, base-unicode-symbols

Files

• LICENSE +674/−0
• README.md +216/−0
• Setup.hs +2/−0
• place-cursor-at.cabal +42/−0
• src/place-cursor-at.hs +605/−0

@@ -0,0 +1,674 @@+                    GNU GENERAL PUBLIC LICENSE+                       Version 3, 29 June 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++                            Preamble++  The GNU General Public License is a free, copyleft license for+software and other kinds of works.++  The licenses for most software and other practical works are designed+to take away your freedom to share and change the works.  By contrast,+the GNU General Public License is intended to guarantee your freedom to+share and change all versions of a program--to make sure it remains free+software for all its users.  We, the Free Software Foundation, use the+GNU General Public License for most of our software; it applies also to+any other work released this way by its authors.  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It is safest+to attach them to the start of each source file to most effectively+state the exclusion of warranty; and each file should have at least+the "copyright" line and a pointer to where the full notice is found.++    place-cursor-at - Utility that moves the mouse cursor using the keyboard+    Copyright (C) 2017-2021  Viacheslav Lotsmanov++    This program is free software: you can redistribute it and/or modify+    it under the terms of the GNU General Public License as published by+    the Free Software Foundation, either version 3 of the License, or+    (at your option) any later version.++    This program is distributed in the hope that it will be useful,+    but WITHOUT ANY WARRANTY; without even the implied warranty of+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the+    GNU General Public License for more details.++    You should have received a copy of the GNU General Public License+    along with this program.  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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>.

@@ -0,0 +1,216 @@+![place-cursor-at](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/logo/horizontal.svg)++A utility for X11 that moves the mouse cursor using the keyboard.+Written in Haskell.++This utility only gives you an ability to quickly move your mouse cursor to one+of 9 common spots of the screen. It’s intended to reduce the use of the mouse,+but not to replace it completely. It doesn’t provide you accurate aiming, only+approximate.++You bind a hotkey (in your WM configuration or by using [xbindkeys]) to run+`place-cursor-at` (say `Super+M`) and when you press it you see 9 windows on+current screen with letters shown on them. When you press a letter on your+keyboard that is associated with one of those windows your mouse cursor appear+at the center of that window and the application closes. Thus you can quickly+move your mouse cursor to one of 9 different spots by two-step combo.++Other key bindings:++1. Press `Escape` to close the application+   (when one of the *letter* windows is focused)++2. Move focus to a *letter* window where you want your mouse cursor to be and+   press `Enter` (this is the same as pressing that *letter* on your keyboard)++I originally created this tool it for myself to use it with+[xmonad](https://github.com/unclechu/xmonadrc)+and [i3](https://github.com/unclechu/i3rc).++![Screenshot](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/screenshot.png)++## Requirements++Either one:++1. [Nix Package Manager]++2. [The Haskell Tool Stack] and:++   1. `libX11` development files+   2. `libXinerama` development files++## How to use++### With Nix++See [Nix Package Manager].++You can run this application like this:++``` sh+nix-shell --run place-cursor-at+```++See also [shell.nix]’s arguments for available options.+For instance if you want to enter a `nix-shell` with `cabal` available:++``` sh+nix-shell --arg withCabal true+```++#### NixOS++You can add this application into your NixOS `configuration.nix` like this:++``` nix+{ pkgs, ... }:+let+  place-cursor-at-src = pkgs.fetchFromGitHub {+    owner = "unclechu";+    repo = "place-cursor-at";+    rev = "ffffffffffffffffffffffffffffffffffffffff"; # Git commit hash+    sha256 = "0000000000000000000000000000000000000000000000000000";+  };++  place-cursor-at = pkgs.callPackage place-cursor-at-src {};+in+{+  environment.systemPackages = [ place-cursor-at ];+}+```++### With Stack++See [The Haskell Tool Stack].++``` sh+stack build+stack exec place-cursor-at+```++You could install `place-cursor-at` binary to `~/.local/bin` directory+(make sure you have this directory in your `PATH` environment variable):++``` sh+stack install+```++#### NixOS note++If you need to work with Stack under NixOS for whatever reason you would have to+use `--system-ghc` in order to make it work. You can manually add `--system-ghc`+to each call of `stack` or define this alias for your convenience:++``` sh+alias stack='stack --system-ghc'+```++## Using it as script++You also can run this application as a script+(`nix-shell` script, so you have to+[install Nix Package Manager](https://nixos.org/nix/manual/#chap-installation)+first):++``` sh+src/place-cursor-at.hs+```++But this application is intended to be used very often (to be run again and+again many times) and to be very responsive, so it’s better to precompile it to+reduce startup time.++## Xinerama note++By default it appears and do its stuff on display where your mouse cursor is.+But you can specify which display where it should appear on:++``` sh+place-cursor-at 1+```++Or on third display:++``` sh+place-cursor-at 3+```++## Jump to specific position without GUI++You can immediately jump to specific position of a screen without showing any+GUI, like this:++``` sh+place-cursor-at LT+```++It’s case-insensitive, this also would work:++``` sh+place-cursor-at lt+```++And you also can specify a display you want to jump to:++``` sh+place-cursor-at lt 1+```++In any order of the arguments:++``` sh+place-cursor-at 1 lt+```++### Codes of available positions++```+| Code | Deciphering   |+| -    | -             |+| LT   | Left-Top      |+| LC   | Left-Center   |+| LB   | Left-Bottom   |+| CT   | Center-Top    |+| CC   | Center-Center |+| CB   | Center-Bottom |+| RT   | Right-Top     |+| RC   | Right-Center  |+| RB   | Right-Bottom  |+```+## Author++[Viacheslav Lotsmanov]++## Contributors++The [logo] is created by [psikoz] and+some technical adjustments are made by [Viacheslav Lotsmanov].++## Licenses++1. **place-cursor-at** — [GNU/GPLv3](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/LICENSE)++2. The logo —+   [Creative Commons — Attribution 4.0 International (CC BY 4.0)][CC BY 4.0]++   These files in [artwork/logo][logo] directory in particular:++   - [artwork/logo/horizontal.svg](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/logo/horizontal.svg)+   - [artwork/logo/horizontal.png](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/logo/horizontal.png)+   - [artwork/logo/vertical.svg](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/logo/vertical.svg)+   - [artwork/logo/vertical.png](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/logo/vertical.png)+   - [artwork/logo/icon.svg](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/logo/icon.svg)+   - [artwork/logo/icon.png](https://raw.githubusercontent.com/unclechu/place-cursor-at/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/logo/icon.png)++[The Haskell Tool Stack]: https://docs.haskellstack.org/en/stable/README/+[Nix Package Manager]: https://nixos.org/manual/nix/stable/#ch-about-nix+[xbindkeys]: https://linux.die.net/man/1/xbindkeys++[shell.nix]: https://github.com/unclechu/place-cursor-at/blob/b636cb9651c6ededbbda80489c79ff4a68653d96/shell.nix+[logo]: https://github.com/unclechu/place-cursor-at/blob/b636cb9651c6ededbbda80489c79ff4a68653d96/artwork/logo++[CC BY 4.0]: https://creativecommons.org/licenses/by/4.0/++[Viacheslav Lotsmanov]: https://github.com/unclechu+[psikoz]: https://github.com/psikoz

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,42 @@+cabal-version: 1.12++-- This file has been generated from package.yaml by hpack version 0.34.2.+--+-- see: https://github.com/sol/hpack+--+-- hash: 66d39f7b6b91273a09289c622d5c81b8bb6f010ee69d032997ed77412a1f96f5++name:           place-cursor-at+version:        1.0.0+synopsis:       A utility for X11 that moves the mouse cursor using the keyboard+category:       Utility, GUI, Desktop, Desktop Environment, X11+homepage:       https://github.com/unclechu/place-cursor-at#readme+bug-reports:    https://github.com/unclechu/place-cursor-at/issues+author:         Viacheslav Lotsmanov+maintainer:     Viacheslav Lotsmanov <lotsmanov89@gmail.com>+copyright:      Copyright © 2017–2021 Viacheslav Lotsmanov+license:        GPL-3+license-file:   LICENSE+tested-with:    GHC ==8.10.4 || ==8.8.4 || ==8.6.4+build-type:     Simple+extra-source-files:+    README.md++source-repository head+  type: git+  location: https://github.com/unclechu/place-cursor-at++executable place-cursor-at+  main-is: place-cursor-at.hs+  hs-source-dirs:+      src+  ghc-options: -threaded+  extra-libraries:+      Xinerama+  build-depends:+      X11 >=1.9 && <2+    , base >=4.12 && <5+    , base-unicode-symbols >=0.2 && <0.3+  other-modules:+      Paths_place_cursor_at+  default-language: Haskell2010

@@ -0,0 +1,605 @@+#! /usr/bin/env nix-shell+#! nix-shell -i runhaskell+#! nix-shell -E "let ghc = n.haskellPackages.ghcWithPackages (p: [p.base-unicode-symbols p.X11]); d = n.mkShell { buildInputs = [ghc]; }; n = import (fetchTarball { url = \"https://github.com/NixOS/nixpkgs/archive/a3fa481cb683d619ab9e1a64877f3c0c5fd24f40.tar.gz\"; sha256 = \"0y5dzi3npv13vyacmb4q93j0cpg6gjgvylq4ckjjvcb6szdsizqi\"; }) {}; in d"++-- Author: Viacheslav Lotsmanov+-- License: GNU/GPLv3 https://raw.githubusercontent.com/unclechu/place-cursor-at/master/LICENSE++{-# OPTIONS_GHC -Wall -fprint-potential-instances #-}+{-# LANGUAGE UnicodeSyntax, BangPatterns, MultiWayIf, ViewPatterns, ScopedTypeVariables, GADTs #-}+{-# LANGUAGE LambdaCase, DerivingStrategies, GeneralizedNewtypeDeriving #-}++import Prelude.Unicode ((∘), (÷), (≡), (⧺), (∧), (≥))++import Data.Bifunctor (first)+import Data.Bits ((.|.))+import Data.Bool (bool)+import Data.Char (toUpper)+import Data.Functor ((<&>))+import Data.List (find)+import Numeric.Natural+import Text.ParserCombinators.ReadP (satisfy)+import Text.Read (ReadPrec, Read (readPrec), lift, choice, readMaybe)++import Control.Applicative ((<|>))+import Control.Arrow ((***), (&&&))+import Control.Concurrent (forkFinally)+import Control.Concurrent.MVar (newEmptyMVar, putMVar, readMVar)+import Control.Exception (SomeException, try, throwIO)+import Control.Monad (forever, forM_, foldM, void)++import System.Environment (getArgs)++import Graphics.X11.Xlib++import Graphics.X11.Xlib.Extras+  ( SizeHints (..)+  , pMinSizeBit+  , pMaxSizeBit+  , changeProperty8+  , propModeReplace+  , queryTree+  , getTextProperty+  , TextProperty (tp_value)+  , killClient+  )++import Graphics.X11.Xinerama+  ( xineramaQueryScreens+  , XineramaScreenInfo (..)+  )++import Foreign.C.String (castCharToCChar, peekCString)+import Foreign.ForeignPtr (ForeignPtr, mallocForeignPtr)+import Foreign.ForeignPtr.Unsafe (unsafeForeignPtrToPtr)+import Foreign.Ptr (Ptr)+import Foreign.Storable (Storable (poke))++foreign import ccall unsafe "XlibExtras.h XSetWMNormalHints"+  xSetWMNormalHints ∷ Display → Window → Ptr SizeHints → IO ()++foreign import ccall unsafe "XlibExtras.h XSetWMSizeHints"+  xSetWMSizeHints ∷ Display → Window → Ptr SizeHints → Int → IO ()+++s, w, h, letterPaddingX, letterPaddingY, offsetPercent ∷ Num a ⇒ a+s = 40; w = s; h = s+letterPaddingX = 10; letterPaddingY = 10+offsetPercent = 10+++windowClassName ∷ String+windowClassName = "place-cursor-at"+++data Pos+   = PosLT | PosCT | PosRT+   | PosLC | PosCC | PosRC+   | PosLB | PosCB | PosRB+     deriving stock (Eq, Show, Enum, Bounded)++instance Read Pos where+  readPrec = go where+    go = choice $ lift <$> x+    insStr a b = void $ satisfy ((a ≡) ∘ toUpper) *> satisfy ((b ≡) ∘ toUpper)++    x =+      [ PosLT <$ insStr 'L' 'T', PosCT <$ insStr 'C' 'T', PosRT <$ insStr 'R' 'T'+      , PosLC <$ insStr 'L' 'C', PosCC <$ insStr 'C' 'C', PosRC <$ insStr 'R' 'C'+      , PosLB <$ insStr 'L' 'B', PosCB <$ insStr 'C' 'B', PosRB <$ insStr 'R' 'B'+      ]+++data Letter+   = Q | W | E+   | A | S | D+   | Z | X | C+     deriving stock (Eq, Show)++letterToKeyCode ∷ Letter → KeyCode+letterToKeyCode = \case+  Q → 24; W → 25; E → 26+  A → 38; S → 39; D → 40+  Z → 52; X → 53; C → 54++positionToLetter ∷ Pos → Letter+positionToLetter = \case+  PosLT → Q; PosCT → W; PosRT → E+  PosLC → A; PosCC → S; PosRC → D+  PosLB → Z; PosCB → X; PosRB → C+++-- | Position relative to either X or Y axis+data AbstractPos+   = MinPos    -- ^ Left of Top+   | MiddlePos -- ^ Center+   | MaxPos    -- ^ Right or Bottom+     deriving stock (Eq, Show)++getAbstractPosX ∷ Pos → AbstractPos+getAbstractPosX = \case+  PosLT → MinPos;    PosLC → MinPos;    PosLB → MinPos+  PosCT → MiddlePos; PosCC → MiddlePos; PosCB → MiddlePos+  PosRT → MaxPos;    PosRC → MaxPos;    PosRB → MaxPos++getAbstractPosY ∷ Pos → AbstractPos+getAbstractPosY = \case+  PosLT → MinPos;    PosCT → MinPos;    PosRT → MinPos+  PosLC → MiddlePos; PosCC → MiddlePos; PosRC → MiddlePos+  PosLB → MaxPos;    PosCB → MaxPos;    PosRB → MaxPos++abstractPosToCoordinate ∷ Fractional a ⇒ a → AbstractPos → a+abstractPosToCoordinate x = \case+  MinPos    → x × offsetPercent ÷ 100+  MiddlePos → x ÷ 2+  MaxPos    → x × (100 - offsetPercent) ÷ 100+++-- | Command-line arguments+data Argv+   = Argv+   { argvOnDisplay  ∷ Maybe SpecificScreenNumber+   -- ^ Jump to specific display+   , argvToPosition ∷ Maybe Pos+   -- ^ Jump to specific position on screen (GUI wont be shown)+   } deriving stock (Show, Eq)++emptyArgv ∷ Argv+emptyArgv = Argv Nothing Nothing+++-- | Screen number that starts with 0.+--+-- N.B. In "Read" and "Show" instances it starts with 1.+-- When parsed or printed it either decrements or increments.+newtype SpecificScreenNumber+      = SpecificScreenNumber { fromSpecificScreenNumber ∷ Natural }+        deriving newtype (Eq, Enum)++-- | Prints wrapped number as a string.+--+-- N.B. But printed number increments, it starts with 1 (instead of 0).+instance Show SpecificScreenNumber where+  show = fromSpecificScreenNumber • succ • show++-- | It reads screen number as plain number that starts with 1.+--+-- N.B. Wrapped value is decremented.+instance Read SpecificScreenNumber where+  readPrec =+    (readPrec ∷ ReadPrec Natural) >>= \x →+      if x ≡ 0+      then fail $ unwords ["Incorrect screen number", show x, " (must start with 1)"]+      else pure ∘ pred ∘ SpecificScreenNumber $ x+++main ∷ IO ()+main = do+  doneHandler ← mkDoneHandler+  (dpy, rootWnd) ← (id &&& defaultRootWindow) <$> openDisplay ""+  killPreviousInstanceIfExists dpy++  (xsn, justGoToPos') ←+    let+      reducer argv x =+        case (readMaybe x <&> \x' → argv { argvOnDisplay  = Just x' })+         <|> (readMaybe x <&> \x' → argv { argvToPosition = Just x' })+          of Just updatedArgv → pure updatedArgv+             Nothing → fail $ "Unexpected argument: " ⧺ show x+    in+      (getArgs >>= foldM reducer emptyArgv) <&> (argvOnDisplay &&& argvToPosition)++  !xsi ← getScreenInfo dpy xsn++  let+    xX, xY, xW, xH ∷ Rational+    relativeX, relativeY ∷ Pos → Rational++    from f = fromIntegral $ f xsi+    xX = from xsi_x_org+    xY = from xsi_y_org+    xW = from xsi_width+    xH = from xsi_height+    relativeX = getAbstractPosX • abstractPosToCoordinate xW+    relativeY = getAbstractPosY • abstractPosToCoordinate xH++    toPosition ∷ Rational → Position+    toPosition = fromInteger ∘ round++    windows ∷ [(Letter, (Position, Position))]+    windows = [minBound..maxBound] <&> \pos →+      let+        x, y ∷ Rational+        x = xX + relativeX pos - (w ÷ 2)+        y = xY + relativeY pos - (h ÷ 2)+      in+        (positionToLetter pos, (toPosition x, toPosition y))++    places ∷ [(Pos, (Position, Position))]+    places = [minBound..maxBound] <&> \pos →+      let+        x, y ∷ Rational+        x = xX + relativeX pos+        y = xY + relativeY pos+      in+        (pos, (toPosition x, toPosition y))++  case justGoToPos' of+       Just pos →+         case lookup pos places of+              Just (x, y) → do+                placeCursorAt dpy rootWnd x y+                closeDisplay dpy++              Nothing → fail $ "Unexpectedly fail to find a 'place' by " ⧺ show pos++       Nothing → do+         closeDisplay dpy+         let places' = places <&> first (letterToKeyCode ∘ positionToLetter)+         let done = doneWithIt doneHandler+         forM_ windows $ windowInstance (done (pure ())) places' • (`forkFinally` done)+         waitBeforeItIsDone doneHandler >>= either throwIO pure+++-- | Kill previous instance of *place-cursor-at*.+--+-- FIXME In some cases it fails the killer with this exception in the log:+--+-- @+-- X Error of failed request:  BadValue (integer parameter out of range for operation)+--   Major opcode of failed request:  113 (X_KillClient)+--   Value in failed request:  0x6000002+--   Serial number of failed request:  259+--   Current serial number in output stream:  260+-- @+--+-- I have no idea what the heck is this. I tried many ways to fix this with no success.+killPreviousInstanceIfExists ∷ Display → IO ()+killPreviousInstanceIfExists dpy = go where+  go = traverseChildWindows (defaultRootWindow dpy)+  kill = killClient dpy++  traverseChildWindows ∷ Window → IO ()+  traverseChildWindows wnd = killEmRecursively where+    killEmRecursively =+      getAllWindowsList wnd+      >>= foldM reducer mempty+      >>= (mapM_ kill *** mapM_ traverseChildWindows) • uncurry (>>)++    reducer ∷ acc ~ ([Window], [Window]) ⇒ acc → Window → IO acc+    reducer acc x = f where+      f = isPlaceCursorAtWindow x <&> \is → (x `appendIf` is *** x `appendIf` not is) acc+      appendIf wndToAppend = bool id (⧺ [wndToAppend])++  getAllWindowsList ∷ Window → IO [Window]+  getAllWindowsList wnd = queryTree dpy wnd <&> \(_, _, x) → x++  isPlaceCursorAtWindow ∷ Window → IO Bool+  isPlaceCursorAtWindow wnd = x where+    x = try matchByWindowClass <&> either (const False ∷ IOError → Bool) id++    matchByWindowClass =+      getTextProperty dpy wnd wM_CLASS+      >>= tp_value • peekCString+      >>= (≡ windowClassName) • pure+++-- | Get info about screen either under cursor or specified by an argument.+getScreenInfo ∷ Display → Maybe SpecificScreenNumber → IO XineramaScreenInfo+getScreenInfo dpy specificScreen = go where+  xineramaFailureMsg = unwords+    [ "Could not obtain Xinerama screens information,"+    , "check that libXinerama dependency is installed"+    , "and Xinerama X11 extension is active!"+    ]++  isSpecifiedScreen ∷ SpecificScreenNumber → XineramaScreenInfo → Bool+  isSpecifiedScreen (SpecificScreenNumber (toInteger • fromInteger → n)) =+    xsi_screen_number • (≡ n)++  isScreenUnderCursor ∷ (Integer, Integer) → XineramaScreenInfo → Bool+  isScreenUnderCursor (mX, mY) screenInfo = x where+    f        = fromIntegral+    (x1, y1) = (f (xsi_x_org screenInfo),      f (xsi_y_org screenInfo))+    (x2, y2) = (x1 + f (xsi_width screenInfo), y1 + f (xsi_height screenInfo))+    x        = (mX ≥ x1 ∧ mY ≥ y1) ∧ (mX < x2 ∧ mY < y2)++  go = do+    screens ←+      xineramaQueryScreens dpy >>=+        maybe (fail xineramaFailureMsg) pure++    (predicateFn ∷ XineramaScreenInfo → Bool, failureMsg ∷ String) ←+      case specificScreen of+           Nothing → do+             mouseCoords ← mousePos dpy (defaultRootWindow dpy) <&> (fromIntegral *** fromIntegral)++             let+               failureMsg = unwords+                 [ "Could not find a screen which is under cursor, something went wrong"+                 , "(mouse position:", show mouseCoords ⧺ ", screens:", show screens ⧺ ")"+                 ]++             pure (isScreenUnderCursor mouseCoords, failureMsg)++           Just screenNum →+             let+               failureMsg = unwords+                 [ "Could not find screen number", show screenNum+                 , "(by Xinerama screen number", show (fromSpecificScreenNumber screenNum) ⧺ "),"+                 , "specified screen number is probably out of range"+                 , "(screens:", show screens ⧺ ")"+                 ]+             in+               pure (isSpecifiedScreen screenNum, failureMsg)++    maybe (fail failureMsg) pure (find predicateFn screens)+++windowInstance+  ∷ IO ()+  → [(KeyCode, (Position, Position))]+  → (Letter, (Position, Position))+  → IO ()++windowInstance done places (letter, (wndX, wndY)) = do++  dpy ← openDisplay ""++  let+    rootWnd = defaultRootWindow dpy+    screen  = defaultScreen     dpy+    gc      = defaultGC         dpy screen+    blackPx = blackPixel        dpy screen+    whitePx = whitePixel        dpy screen++  setLineAttributes dpy gc 3 0 0 0 -- Increase line thickness+  setForeground dpy gc whitePx++  let+    placeAt ∷ Position → Position → IO ()+    placeAt = placeCursorAt dpy rootWnd++  wnd ← createSimpleWindow dpy rootWnd 0 0 w h 0 whitePx blackPx+  shPtr ← allocSH+  xSetWMNormalHints dpy wnd shPtr+  xSetWMSizeHints dpy wnd shPtr $ pMinSizeBit .|. pMaxSizeBit++  storeName dpy wnd $ "Place Cursor At [" ⧺ show letter ⧺ "]"+  changeProperty8 dpy wnd wM_CLASS sTRING propModeReplace $ castCharToCChar <$> windowClassName++  mapWindow dpy wnd+  placeWindowAt dpy wnd wndX wndY++  selectInput dpy wnd $ keyPressMask .|. exposureMask+  () <$ allocaXEvent (forever ∘ evLoop done dpy wnd gc placeAt letter places)+++allocSH ∷ IO (Ptr SizeHints)+allocSH = go where+  go = malloc >>= unsafeForeignPtrToPtr • \ptr → ptr <$ poke ptr sh++  malloc ∷ IO (ForeignPtr SizeHints)+  malloc = mallocForeignPtr++  sh ∷ SizeHints+  sh = SizeHints+    { sh_min_size    = Just (w, h)+    , sh_max_size    = Just (w, h)+    , sh_resize_inc  = Nothing+    , sh_aspect      = Nothing+    , sh_base_size   = Nothing+    , sh_win_gravity = Nothing+    }+++mousePos ∷ Display → Window → IO (Integer, Integer)+mousePos dpy wnd = f <$> queryPointer dpy wnd+  where f (_, _, _, rootX, rootY, _, _, _) = (toInteger rootX, toInteger rootY)+++placeWindowAt ∷ Display → Window → Position → Position → IO ()+placeWindowAt dpy wnd x y = moveResizeWindow dpy wnd x y w h++placeCursorAt ∷ Display → Window → Position → Position → IO ()+placeCursorAt dpy wnd x y = f where f = warpPointer dpy wnd wnd 0 0 0 0 x y+++evLoop+  ∷ IO ()+  → Display → Window → GC+  → (Position → Position → IO ())+  → Letter+  → [(KeyCode, (Position, Position))]+  → XEventPtr+  → IO ()++evLoop done dpy wnd gc placeAt letter places evPtr = do+  nextEvent dpy evPtr+  evType ← get_EventType evPtr+  let getKeyCode (_, _, _, _, _, _, _, _, keyCode, _) = keyCode++  if+   | evType ≡ keyPress → get_KeyEvent evPtr >>= getKeyCode • handleKey done placeAt places letter+   | evType ≡ expose   → draw dpy wnd gc letter+   | otherwise         → pure ()+++handleKey+  ∷ IO ()+  → (Position → Position → IO ())+  → [(KeyCode, (Position, Position))]+  → Letter+  → KeyCode+  → IO ()++handleKey done placeAt places letter keyCode+  | keyCode ≡ 9  = done -- Escape+  | keyCode ≡ 36 = resolve ∘ letterToKeyCode $ letter -- Enter+  | otherwise    = resolve keyCode+  where+    coordsByKeyCode keyCode' = snd <$> find ((≡ keyCode') ∘ fst) places+    resolve (coordsByKeyCode → Just coords) = uncurry placeAt coords >> done+    resolve _ = pure ()+++data LinePointsRelativity = Absolute | Relative deriving stock (Eq, Show)+data Line = Line LinePointsRelativity [Point] deriving stock (Eq, Show)++draw ∷ Display → Window → GC → Letter → IO ()+draw dpy wnd gc (letterToLines → linesToRender) =+  forM_ linesToRender $ \(Line rel points) →+    let+      f n rescale = (round ∷ Rational → Position) ∘ rescale ∘ fromIntegral $ n++      rescaledPoints = points <&> \(Point x y) →+        Point+          (f x (× ((pred w - letterPaddingX × 2) ÷ 100)))+          (f y (× ((pred h - letterPaddingY × 2) ÷ 100)))++      coordMode = case rel of+        Absolute → coordModeOrigin+        Relative → coordModePrevious++      shiftPadding = case rel of+        Absolute → fmap shift+        Relative → \case (x : xs) → shift x : xs; [] → []+        where shift (Point x y) = Point (x + letterPaddingX) (y + letterPaddingY)+    in+      drawLines dpy wnd gc (shiftPadding rescaledPoints) coordMode++-- | Manually draw letters using simple lines.+--+-- Coordinates are like percents, in range form 0 to 100.+letterToLines ∷ Letter → [Line]+letterToLines = \case+  Q → [ Line Absolute $ let spacer = 0 in+          [ Point roundCorner 0+          , Point (100 - roundCorner) 0+          , Point 100 roundCorner+          , Point 100 (100 - roundCorner - spacer)+          , Point (100 - roundCorner) (100 - spacer)+          , Point roundCorner (100 - spacer)+          , Point 0 (100 - spacer - roundCorner)+          , Point 0 roundCorner+          , Point roundCorner 0+          ]+      , Line Relative+          [ Point 105 125+          , Point (-50) (-50)+          ]+      ]+  W → [ Line Absolute+          [ Point 0 0+          , Point 0 100+          , Point 50 55+          , Point 100 100+          , Point 100 0+          ]+      ]+  E → [ Line Absolute+          [ Point 110 0+          , Point 0 0+          , Point 0 45+          , Point 110 45+          ]+      , Line Absolute+          [ Point 0 50+          , Point 0 100+          , Point 110 100+          ]+      ]+  A → [ Line Absolute+          [ Point 0 110+          , Point 0 roundCorner+          , Point roundCorner 0+          , Point (100 - roundCorner) 0+          , Point 100 roundCorner+          , Point 100 110+          ]+      , Line Absolute+          [ Point 0 60+          , Point 100 60+          ]+      ]+  S → [ Line Absolute+          [ Point 100 roundCorner+          , Point (100 - roundCorner) 0+          , Point roundCorner 0+          , Point 0 roundCorner+          , Point 0 (48 - roundCorner)+          , Point roundCorner 48+          , Point (100 - roundCorner) 48+          , Point 100 (48 + roundCorner)+          , Point 100 (100 - roundCorner)+          , Point (100 - roundCorner) 100+          , Point roundCorner 100+          , Point 0 (100 - roundCorner)+          ]+      ]+  D → [ Line Absolute $+          let roundCorner' = (round ∷ Rational → Position) (fromIntegral roundCorner × (3/2)) in+          [ Point 0 0+          , Point 0 100+          , Point (100 - roundCorner') 100+          , Point 100 (100 - roundCorner')+          , Point 100 roundCorner'+          , Point (100 - roundCorner') 0+          , Point 0 0+          ]+      ]+  Z → [ Line Absolute+          [ Point 0 0+          , Point 90 0+          , Point 5 100+          , Point 105 100+          ]+      ]+  X → [ Line Absolute+          [ Point 0 0+          , Point 103 103+          ]+      , Line Absolute+          [ Point 0 100+          , Point 103 (-3)+          ]+      ]+  C → [ Line Absolute+          [ Point 100 (roundCorner + 8)+          , Point 100 roundCorner+          , Point (100 - roundCorner) 0+          , Point roundCorner 0+          , Point 0 roundCorner+          , Point 0 (100 - roundCorner)+          , Point roundCorner 100+          , Point (100 - roundCorner) 100+          , Point 100 (100 - roundCorner)+          , Point 100 (100 - (roundCorner + 8))+          ]+      ]+  where roundCorner = 12+++data DoneApi = DoneApi+   { doneWithIt         ∷ Either SomeException () → IO ()+   , waitBeforeItIsDone ∷ IO (Either SomeException ())+   }++mkDoneHandler ∷ IO DoneApi+mkDoneHandler = newEmptyMVar <&> \mvar → DoneApi+  { doneWithIt         = putMVar mvar+  , waitBeforeItIsDone = readMVar mvar+  }+++(•) ∷ (a → b) → (b → c) → a → c+(•) = flip (∘)+infixl 9 •+{-# INLINE (•) #-}++-- This operator is provided by newer version of ‘base-unicode-symbols’.+-- This adds support for older snaphots.+(×) ∷ Num a ⇒ a → a → a+(×) = (Prelude.*)+infixl 7 ×+{-# INLINE (×) #-}