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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
--------------------------------------------------------------------------------
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
module Main where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>), (<*>))
import Control.Concurrent (forkIO, threadDelay)
import qualified Control.Concurrent.Chan as Chan
import Control.Exception (finally)
import Control.Monad (forever, unless, when)
import qualified Data.Aeson.Extended as A
import Data.Monoid (mempty, (<>))
import Data.Time (UTCTime)
import Data.Version (showVersion)
import qualified Options.Applicative as OA
import Patat.AutoAdvance
import Patat.Presentation
import qualified Paths_patat
import Prelude
import qualified System.Console.ANSI as Ansi
import System.Directory (doesFileExist,
getModificationTime)
import System.Exit (exitFailure, exitSuccess)
import qualified System.IO as IO
import qualified Text.PrettyPrint.ANSI.Leijen as PP
--------------------------------------------------------------------------------
data Options = Options
{ oFilePath :: !(Maybe FilePath)
, oForce :: !Bool
, oDump :: !Bool
, oWatch :: !Bool
, oVersion :: !Bool
} deriving (Show)
--------------------------------------------------------------------------------
parseOptions :: OA.Parser Options
parseOptions = Options
<$> (OA.optional $ OA.strArgument $
OA.metavar "FILENAME" <>
OA.help "Input file")
<*> (OA.switch $
OA.long "force" <>
OA.short 'f' <>
OA.help "Force ANSI terminal" <>
OA.hidden)
<*> (OA.switch $
OA.long "dump" <>
OA.short 'd' <>
OA.help "Just dump all slides and exit" <>
OA.hidden)
<*> (OA.switch $
OA.long "watch" <>
OA.short 'w' <>
OA.help "Watch file for changes")
<*> (OA.switch $
OA.long "version" <>
OA.help "Display version info and exit" <>
OA.hidden)
--------------------------------------------------------------------------------
parserInfo :: OA.ParserInfo Options
parserInfo = OA.info (OA.helper <*> parseOptions) $
OA.fullDesc <>
OA.header ("patat v" <> showVersion Paths_patat.version) <>
OA.progDescDoc (Just desc)
where
desc = PP.vcat
[ "Terminal-based presentations using Pandoc"
, ""
, "Controls:"
, "- Next slide: space, enter, l, right"
, "- Previous slide: backspace, h, left"
, "- Go forward 10 slides: j, down"
, "- Go backward 10 slides: k, up"
, "- First slide: 0"
, "- Last slide: G"
, "- Reload file: r"
, "- Quit: q"
]
--------------------------------------------------------------------------------
parserPrefs :: OA.ParserPrefs
parserPrefs = OA.prefs OA.showHelpOnError
--------------------------------------------------------------------------------
errorAndExit :: [String] -> IO a
errorAndExit msg = do
mapM_ (IO.hPutStrLn IO.stderr) msg
exitFailure
--------------------------------------------------------------------------------
assertAnsiFeatures :: IO ()
assertAnsiFeatures = do
supports <- Ansi.hSupportsANSI IO.stdout
unless supports $ errorAndExit
[ "It looks like your terminal does not support ANSI codes."
, "If you still want to run the presentation, use `--force`."
]
--------------------------------------------------------------------------------
main :: IO ()
main = do
options <- OA.customExecParser parserPrefs parserInfo
when (oVersion options) $ do
putStrLn (showVersion Paths_patat.version)
exitSuccess
filePath <- case oFilePath options of
Just fp -> return fp
Nothing -> OA.handleParseResult $ OA.Failure $
OA.parserFailure parserPrefs parserInfo OA.ShowHelpText mempty
errOrPres <- readPresentation filePath
pres <- either (errorAndExit . return) return errOrPres
unless (oForce options) assertAnsiFeatures
if oDump options
then dumpPresentation pres
else interactiveLoop options pres
where
interactiveLoop :: Options -> Presentation -> IO ()
interactiveLoop options pres0 = (`finally` Ansi.showCursor) $ do
IO.hSetBuffering IO.stdin IO.NoBuffering
Ansi.hideCursor
-- Spawn the initial channel that gives us commands based on user input.
commandChan0 <- Chan.newChan
_ <- forkIO $ forever $
readPresentationCommand >>= Chan.writeChan commandChan0
-- If an auto delay is set, use 'autoAdvance' to create a new one.
commandChan <- case psAutoAdvanceDelay (pSettings pres0) of
Nothing -> return commandChan0
Just (A.FlexibleNum delay) -> autoAdvance delay commandChan0
-- Spawn a thread that adds 'Reload' commands based on the file time.
mtime0 <- getModificationTime (pFilePath pres0)
when (oWatch options) $ do
_ <- forkIO $ watcher commandChan (pFilePath pres0) mtime0
return ()
let loop :: Presentation -> Maybe String -> IO ()
loop pres mbError = do
case mbError of
Nothing -> displayPresentation pres
Just err -> displayPresentationError pres err
c <- Chan.readChan commandChan
update <- updatePresentation c pres
case update of
ExitedPresentation -> return ()
UpdatedPresentation pres' -> loop pres' Nothing
ErroredPresentation err -> loop pres (Just err)
loop pres0 Nothing
--------------------------------------------------------------------------------
watcher :: Chan.Chan PresentationCommand -> FilePath -> UTCTime -> IO a
watcher chan filePath mtime0 = do
-- The extra exists check helps because some editors temporarily make the
-- file dissapear while writing.
exists <- doesFileExist filePath
mtime1 <- if exists then getModificationTime filePath else return mtime0
when (mtime1 > mtime0) $ Chan.writeChan chan Reload
threadDelay (200 * 1000)
watcher chan filePath mtime1
|
