aboutsummaryrefslogtreecommitdiffstats
path: root/XMonad/Prompt/Ssh.hs
blob: 4b382456896841e5eb1cb7c0459056f683241800 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
-----------------------------------------------------------------------------
-- |
-- Module      :  XMonad.Prompt.Ssh
-- Copyright   :  (C) 2007 Andrea Rossato
-- License     :  BSD3
--
-- Maintainer  :  andrea.rossato@unibz.it
-- Stability   :  unstable
-- Portability :  unportable
--
-- A ssh prompt for XMonad
--
-----------------------------------------------------------------------------

module XMonad.Prompt.Ssh
    ( -- * Usage
      -- $usage
      sshPrompt,
      Ssh,
    ) where

import XMonad
import XMonad.Util.Run
import XMonad.Prompt

import System.Directory
import System.Environment
import Control.Exception as E

import Control.Monad
import Data.Maybe
import Data.List(elemIndex)

econst :: Monad m => a -> IOException -> m a
econst = const . return

-- $usage
-- 1. In your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Prompt
-- > import XMonad.Prompt.Ssh
--
-- 2. In your keybindings add something like:
--
-- >   , ((modm .|. controlMask, xK_s), sshPrompt def)
--
-- Keep in mind, that if you want to use the completion you have to
-- disable the "HashKnownHosts" option in your ssh_config
--
-- For detailed instruction on editing the key binding see
-- "XMonad.Doc.Extending#Editing_key_bindings".

data Ssh = Ssh

instance XPrompt Ssh where
    showXPrompt       Ssh = "SSH to: "
    commandToComplete _ c = maybe c (\(_u,h) -> h) (parseHost c)
    nextCompletion _t c l = maybe next (\(u,_h) -> u ++ "@" ++ next) hostPared
                            where 
                              hostPared = parseHost c
                              next = getNextCompletion (maybe c (\(_u,h) -> h) hostPared) l

sshPrompt :: XPConfig -> X ()
sshPrompt c = do
  sc <- io sshComplList
  mkXPrompt Ssh c (mkComplFunFromList sc) ssh

ssh :: String -> X ()
ssh = runInTerm "" . ("ssh " ++ )

sshComplList :: IO [String]
sshComplList = uniqSort `fmap` liftM2 (++) sshComplListLocal sshComplListGlobal

sshComplListLocal :: IO [String]
sshComplListLocal = do
  h <- getEnv "HOME"
  s1 <- sshComplListFile $ h ++ "/.ssh/known_hosts"
  s2 <- sshComplListConf $ h ++ "/.ssh/config"
  return $ s1 ++ s2

sshComplListGlobal :: IO [String]
sshComplListGlobal = do
  env <- getEnv "SSH_KNOWN_HOSTS" `E.catch` econst "/nonexistent"
  fs <- mapM fileExists [ env
                        , "/usr/local/etc/ssh/ssh_known_hosts"
                        , "/usr/local/etc/ssh_known_hosts"
                        , "/etc/ssh/ssh_known_hosts"
                        , "/etc/ssh_known_hosts"
                        ]
  case catMaybes fs of
    []    -> return []
    (f:_) -> sshComplListFile' f

sshComplListFile :: String -> IO [String]
sshComplListFile kh = do
  f <- doesFileExist kh
  if f then sshComplListFile' kh
       else return []

sshComplListFile' :: String -> IO [String]
sshComplListFile' kh = do
  l <- readFile kh
  return $ map (getWithPort . takeWhile (/= ',') . concat . take 1 . words)
         $ filter nonComment
         $ lines l

sshComplListConf :: String -> IO [String]
sshComplListConf kh = do
  f <- doesFileExist kh
  if f then sshComplListConf' kh
       else return []

sshComplListConf' :: String -> IO [String]
sshComplListConf' kh = do
  l <- readFile kh
  return $ map (!!1)
         $ filter isHost
         $ map words
         $ lines l
 where
   isHost ws = take 1 ws == ["Host"] && length ws > 1

fileExists :: String -> IO (Maybe String)
fileExists kh = do
  f <- doesFileExist kh
  if f then return $ Just kh
       else return Nothing

nonComment :: String -> Bool
nonComment []      = False
nonComment ('#':_) = False
nonComment ('|':_) = False -- hashed, undecodeable
nonComment _       = True

getWithPort :: String -> String
getWithPort ('[':str) = host ++ " -p " ++ port
    where (host,p) = break (==']') str
          port = case p of
                   ']':':':x -> x
                   _         -> "22"
getWithPort  str = str

parseHost :: String -> Maybe (String, String)
parseHost a = elemIndex '@' a  >>= (\c-> Just ( (take c a), (drop (c+1) a) ) )