From 4866f2e367dfcf22a9591231ba40948826a1b438 Mon Sep 17 00:00:00 2001
From: Spencer Janssen <sjanssen@cse.unl.edu>
Date: Thu, 1 Nov 2007 21:10:59 +0100
Subject: Hierarchify

darcs-hash:20071101201059-a5988-fc1f1262bec1b69e13ba18ae7cefeafc8c4471d4.gz
---
 XMonad/Prompt/Shell.hs | 127 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 XMonad/Prompt/Shell.hs

(limited to 'XMonad/Prompt/Shell.hs')

diff --git a/XMonad/Prompt/Shell.hs b/XMonad/Prompt/Shell.hs
new file mode 100644
index 0000000..dfbfb09
--- /dev/null
+++ b/XMonad/Prompt/Shell.hs
@@ -0,0 +1,127 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Prompt.Shell
+-- Copyright   :  (C) 2007 Andrea Rossato
+-- License     :  BSD3
+--
+-- Maintainer  :  andrea.rossato@unibz.it
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A shell prompt for XMonad
+--
+-----------------------------------------------------------------------------
+
+module XMonad.Prompt.Shell(
+                             -- * Usage
+                             -- $usage
+                             shellPrompt
+                             , getShellCompl
+                             , split
+                             , prompt
+                             , safePrompt
+                              ) where
+
+import System.Environment
+import Control.Monad
+import Data.List
+import System.Directory
+import System.IO
+import XMonad.Util.Run
+import XMonad
+import XMonad.Prompt
+
+-- $usage
+--
+-- 1. In Config.hs add:
+--
+-- > import XMonad.Prompt
+-- > import XMonad.Prompt.Shell
+--
+-- 2. In your keybindings add something like:
+--
+-- >   , ((modMask .|. controlMask, xK_x), shellPrompt defaultXPConfig)
+--
+
+-- %import XMonad.Prompt
+-- %import XMonad.Prompt.ShellPrompt
+-- %keybind , ((modMask .|. controlMask, xK_x), shellPrompt defaultXPConfig)
+
+data Shell = Shell
+
+instance XPrompt Shell where
+    showXPrompt Shell = "Run: "
+
+shellPrompt :: XPConfig -> X ()
+shellPrompt c = do
+    cmds <- io $ getCommands
+    mkXPrompt Shell c (getShellCompl cmds) spawn
+
+-- | See safe and unsafeSpawn. prompt is an alias for safePrompt;
+-- safePrompt and unsafePrompt work on the same principles, but will use
+-- XPrompt to interactively query the user for input; the appearance is
+-- set by passing an XPConfig as the second argument. The first argument
+-- is the program to be run with the interactive input.
+-- You would use these like this:
+--
+-- >     , ((modMask,               xK_b     ), safePrompt "firefox" greenXPConfig)
+-- >     , ((modMask .|. shiftMask, xK_c     ), prompt ("xterm" ++ " -e") greenXPConfig)
+--
+-- Note that you want to use safePrompt for Firefox input, as Firefox
+-- wants URLs, and unsafePrompt for the XTerm example because this allows
+-- you to easily start a terminal executing an arbitrary command, like
+-- 'top'.
+prompt, unsafePrompt, safePrompt :: FilePath -> XPConfig -> X ()
+prompt = unsafePrompt
+safePrompt c config = mkXPrompt Shell config (getShellCompl [c]) run
+    where run = safeSpawn c
+unsafePrompt c config = mkXPrompt Shell config (getShellCompl [c]) run
+    where run a = unsafeSpawn $ c ++ " " ++ a
+
+getShellCompl :: [String] -> String -> IO [String]
+getShellCompl cmds s | s == "" || last s == ' ' = return []
+                     | otherwise                = do
+    f <- fmap lines $ runProcessWithInput "bash" [] ("compgen -A file " ++ s ++ "\n")
+    return . map escape . uniqSort $ f ++ commandCompletionFunction cmds s
+
+commandCompletionFunction :: [String] -> String -> [String]
+commandCompletionFunction cmds str | '/' `elem` str = []
+                                   | otherwise      = filter (isPrefixOf str) cmds
+
+getCommands :: IO [String]
+getCommands = do
+    p  <- getEnv "PATH" `catch` const (return [])
+    let ds = split ':' p
+        fp d f = d ++ "/" ++ f
+    es <- forM ds $ \d -> do
+        exists <- doesDirectoryExist d
+        if exists
+            then getDirectoryContents d >>= filterM (isExecutable . fp d)
+            else return []
+    return . uniqSort . concat $ es
+
+isExecutable :: FilePath ->IO Bool
+isExecutable f = do
+    fe <- doesFileExist f
+    if fe
+        then fmap executable $ getPermissions f
+        else return False
+
+split :: Eq a => a -> [a] -> [[a]]
+split _ [] = []
+split e l =
+    f : split e (rest ls)
+        where
+          (f,ls) = span (/=e) l
+          rest s | s == []   = []
+                 | otherwise = tail s
+
+escape :: String -> String
+escape []       = ""
+escape (' ':xs) = "\\ " ++ escape xs
+escape (x:xs)
+    | isSpecialChar x = '\\' : x : escape xs
+    | otherwise       = x : escape xs
+
+isSpecialChar :: Char -> Bool
+isSpecialChar =  flip elem "\\@\"'#?$*()[]{};"
-- 
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