git.iko.soy/typeable/file-embed
on c421af7 help sign in
.github/workflows/tests.ymldeleted−32
since splitsnapshots
unifiedsplit
@@ -1,32 +0,0 @@
1−name: Tests
2−
3−on: [pull_request, push]
4−
5−jobs:
6− build:
7− name: CI
8− runs-on: ${{ matrix.os }}
9− strategy:
10− fail-fast: false
11− matrix:
12− os: [ubuntu-latest, macos-latest, windows-latest]
13− resolver: [nightly, lts-15, lts-14, lts-12, lts-11, lts-9]
14−
15− steps:
16− - name: Clone project
17− uses: actions/checkout@v2
18−
19− - name: Cache dependencies
20− uses: actions/cache@v1
21− with:
22− path: ~/.stack
23− key: ${{ runner.os }}-${{ matrix.resolver }}-${{ hashFiles('stack.yaml') }}
24− restore-keys: |
25− ${{ runner.os }}-${{ matrix.resolver }}-
26−
27− - name: Build and run tests
28− shell: bash
29− run: |
30− set -ex
31− stack upgrade || curl -sSL https://get.haskellstack.org/ | sh -s - -f
32− stack test --fast --no-terminal --resolver=${{ matrix.resolver }}
.gitignore−1
@@ -1,4 +1,3 @@
1dist
1dist
2*.swp
2*.swp
3.stack-work
3.stack-work
4−/tarballs/
.travis.ymlnew file+60
@@ -0,0 +1,60 @@
1+# This file has been generated
2+language: c
3+sudo: false
4+
5+matrix:
6+ include:
7+ # Have to use newer cabal, 1.16 passes -XHaskell98 to GHC
8+ - env: CABALVER=1.22 GHCVER=6.12.3
9+ addons: {apt: {packages: [cabal-install-1.22,ghc-6.12.3], sources: [hvr-ghc]}}
10+ - env: CABALVER=1.16 GHCVER=7.0.4
11+ addons: {apt: {packages: [cabal-install-1.16,ghc-7.0.4], sources: [hvr-ghc]}}
12+ - env: CABALVER=1.16 GHCVER=7.2.2
13+ addons: {apt: {packages: [cabal-install-1.16,ghc-7.2.2], sources: [hvr-ghc]}}
14+ - env: CABALVER=1.16 GHCVER=7.4.2
15+ addons: {apt: {packages: [cabal-install-1.16,ghc-7.4.2], sources: [hvr-ghc]}}
16+ - env: CABALVER=1.16 GHCVER=7.6.3
17+ addons: {apt: {packages: [cabal-install-1.16,ghc-7.6.3], sources: [hvr-ghc]}}
18+ - env: CABALVER=1.18 GHCVER=7.8.4
19+ addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4], sources: [hvr-ghc]}}
20+ - env: CABALVER=1.22 GHCVER=7.10.1
21+ addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.1], sources: [hvr-ghc]}}
22+ - env: CABALVER=head GHCVER=head
23+ addons: {apt: {packages: [cabal-install-head,ghc-head], sources: [hvr-ghc]}}
24+
25+ allow_failures:
26+ - env: CABALVER=head GHCVER=head
27+
28+before_install:
29+ - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH
30+
31+install:
32+ - cabal --version
33+ - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
34+ - travis_retry cabal update
35+ - sed -i 's/^jobs:/-- jobs:/' ${HOME}/.cabal/config
36+ - if [ $GHCVER = "6.12.3" ]; then
37+ cabal install --only-dependencies;
38+ else
39+ cabal install --only-dependencies --enable-tests --enable-benchmarks;
40+ fi
41+
42+script:
43+ - if [ -f configure.ac ]; then autoreconf -i; fi
44+ - if [ $GHCVER = "6.12.3" ]; then
45+ cabal configure -v2;
46+ else
47+ cabal configure --enable-tests --enable-benchmarks -v2;
48+ fi
49+ - cabal build # this builds all libraries and executables (including tests/benchmarks)
50+ - if [ $GHCVER != "6.12.3" ]; then cabal test; fi
51+ - cabal check
52+ - cabal sdist # tests that a source-distribution can be generated
53+
54+# Check that the resulting source distribution can be built & installed.
55+# If there are no other `.tar.gz` files in `dist`, this can be even simpler:
56+# `cabal install --force-reinstalls dist/*-*.tar.gz`
57+ - SRC_TGZ=$(cabal info . | awk '{print $2;exit}').tar.gz &&
58+ (cd dist && cabal install --force-reinstalls "$SRC_TGZ")
59+
60+# EOF
ChangeLog.md−42
@@ -1,45 +1,3 @@
1−# ChangeLog for file-embed
2−
3−## 0.0.15.0
4−
5−* Add `makeRelativeToLocationPredicate`
6−
7−## 0.0.14.0
8−
9−* Add `embedFileIfExists`
10−
11−## 0.0.13.0
12−
13−* Ensure that directory listings are returned in sorted order for reproducibility [yesodweb/yesod#1684](https://github.com/yesodweb/yesod/issues/1684)
14−
15−## 0.0.12.0
16−
17−* Use the `Bytes` literal on newer GHCs to reduce memory usage during compilation [#36](https://github.com/snoyberg/file-embed/pull/36)
18−
19−## 0.0.11.2
20−
21−* Haddock markup fix
22−
23−## 0.0.11.1
24−
25−* Support GHC 8.10
26−
27−## 0.0.11
28−
29−* embedDirListing [#26](https://github.com/snoyberg/file-embed/pull/26)
30−
31−## 0.0.10.1
32−
33−* Minor doc improvements
34−
35−## 0.0.10
36−
37−* `makeRelativeToProject`
38−
39−## 0.0.9
40−
41−* embedStringFile [#14](https://github.com/snoyberg/file-embed/pull/14)
42−
43## 0.0.8.2
1## 0.0.8.2
44
2
45* Improve inject documentation [#11](https://github.com/snoyberg/file-embed/issues/11)
3* Improve inject documentation [#11](https://github.com/snoyberg/file-embed/issues/11)
Data/FileEmbed.hs+14−121
@@ -3,7 +3,7 @@
3{-# LANGUAGE OverloadedStrings #-}
3{-# LANGUAGE OverloadedStrings #-}
4-- | This module uses template Haskell. Following is a simplified explanation of usage for those unfamiliar with calling Template Haskell functions.
4-- | This module uses template Haskell. Following is a simplified explanation of usage for those unfamiliar with calling Template Haskell functions.
5--
5--
6−-- The function @embedFile@ in this modules embeds a file into the executable
6+-- The function @embedFile@ in this modules embeds a file into the exceutable
7-- that you can use it at runtime. A file is represented as a @ByteString@.
7-- that you can use it at runtime. A file is represented as a @ByteString@.
8-- However, as you can see below, the type signature indicates a value of type
8-- However, as you can see below, the type signature indicates a value of type
9-- @Q Exp@ will be returned. In order to convert this into a @ByteString@, you
9-- @Q Exp@ will be returned. In order to convert this into a @ByteString@, you
@@ -19,10 +19,8 @@
19module Data.FileEmbed
19module Data.FileEmbed
20 ( -- * Embed at compile time
20 ( -- * Embed at compile time
21 embedFile
21 embedFile
22− , embedFileIfExists
23 , embedOneFileOf
22 , embedOneFileOf
24 , embedDir
23 , embedDir
25− , embedDirListing
26 , getDir
24 , getDir
27 -- * Embed as a IsString
25 -- * Embed as a IsString
28 , embedStringFile
26 , embedStringFile
@@ -37,9 +35,6 @@ module Data.FileEmbed
37 , injectFile
35 , injectFile
38 , injectWith
36 , injectWith
39 , injectFileWith
37 , injectFileWith
40− -- * Relative path manipulation
41− , makeRelativeToProject
42− , makeRelativeToLocationPredicate
43 -- * Internal
38 -- * Internal
44 , stringToBs
39 , stringToBs
45 , bsToExp
40 , bsToExp
@@ -48,34 +43,30 @@ module Data.FileEmbed
48
43
49import Language.Haskell.TH.Syntax
44import Language.Haskell.TH.Syntax
50 ( Exp (AppE, ListE, LitE, TupE, SigE, VarE)
45 ( Exp (AppE, ListE, LitE, TupE, SigE, VarE)
51− , Lit (..)
46+#if MIN_VERSION_template_haskell(2,5,0)
47+ , Lit (StringL, StringPrimL, IntegerL)
48+#else
49+ , Lit (StringL, IntegerL)
50+#endif
52 , Q
51 , Q
53 , runIO
52 , runIO
54− , qLocation, loc_filename
55#if MIN_VERSION_template_haskell(2,7,0)
53#if MIN_VERSION_template_haskell(2,7,0)
56 , Quasi(qAddDependentFile)
54 , Quasi(qAddDependentFile)
57#endif
55#endif
58 )
56 )
59−#if MIN_VERSION_template_haskell(2,16,0)
60−import Language.Haskell.TH ( mkBytes, bytesPrimL )
61−import qualified Data.ByteString.Internal as B
62−#endif
63import System.Directory (doesDirectoryExist, doesFileExist,
57import System.Directory (doesDirectoryExist, doesFileExist,
64− getDirectoryContents, canonicalizePath)
58+ getDirectoryContents)
65−import Control.Exception (throw, tryJust, ErrorCall(..))
59+import Control.Exception (throw, ErrorCall(..))
66−import Control.Monad (filterM, guard)
60+import Control.Monad (filterM)
67import qualified Data.ByteString as B
61import qualified Data.ByteString as B
68import qualified Data.ByteString.Char8 as B8
62import qualified Data.ByteString.Char8 as B8
69import Control.Arrow ((&&&), second)
63import Control.Arrow ((&&&), second)
70import Control.Applicative ((<$>))
64import Control.Applicative ((<$>))
71import Data.ByteString.Unsafe (unsafePackAddressLen)
65import Data.ByteString.Unsafe (unsafePackAddressLen)
72−import System.IO.Error (isDoesNotExistError)
73import System.IO.Unsafe (unsafePerformIO)
66import System.IO.Unsafe (unsafePerformIO)
74−import System.FilePath ((</>), takeDirectory, takeExtension)
67+import System.FilePath ((</>))
75import Data.String (fromString)
68import Data.String (fromString)
76import Prelude as P
69import Prelude as P
77−import Data.List (sortBy)
78−import Data.Ord (comparing)
79
70
80-- | Embed a single file in your source code.
71-- | Embed a single file in your source code.
81--
72--
@@ -90,40 +81,13 @@ embedFile fp =
90#endif
81#endif
91 (runIO $ B.readFile fp) >>= bsToExp
82 (runIO $ B.readFile fp) >>= bsToExp
92
83
93−-- | Maybe embed a single file in your source code depending on whether or not file exists.
94−--
95−-- Warning: When a build is compiled with the file missing, a recompile when the file exists might not trigger an embed of the file.
96−-- You might try to fix this by doing a clean build.
97−--
98−-- > import qualified Data.ByteString
99−-- >
100−-- > maybeMyFile :: Maybe Data.ByteString.ByteString
101−-- > maybeMyFile = $(embedFileIfExists "dirName/fileName")
102−--
103−-- @since 0.0.14.0
104−embedFileIfExists :: FilePath -> Q Exp
105−embedFileIfExists fp = do
106− mbs <- runIO maybeFile
107− case mbs of
108− Nothing -> [| Nothing |]
109− Just bs -> do
110−#if MIN_VERSION_template_haskell(2,7,0)
111− qAddDependentFile fp
112−#endif
113− [| Just $(bsToExp bs) |]
114− where
115− maybeFile :: IO (Maybe B.ByteString)
116− maybeFile =
117− either (const Nothing) Just <$>
118− tryJust (guard . isDoesNotExistError) (B.readFile fp)
119−
120-- | Embed a single existing file in your source code
84-- | Embed a single existing file in your source code
121-- out of list a list of paths supplied.
85-- out of list a list of paths supplied.
122--
86--
123-- > import qualified Data.ByteString
87-- > import qualified Data.ByteString
124-- >
88-- >
125-- > myFile :: Data.ByteString.ByteString
89-- > myFile :: Data.ByteString.ByteString
126−-- > myFile = $(embedOneFileOf [ "dirName/fileName", "src/dirName/fileName" ])
90+-- > myFile = $(embedFile' [ "dirName/fileName", "src/dirName/fileName" ])
127embedOneFileOf :: [FilePath] -> Q Exp
91embedOneFileOf :: [FilePath] -> Q Exp
128embedOneFileOf ps =
92embedOneFileOf ps =
129 (runIO $ readExistingFile ps) >>= \ ( path, content ) -> do
93 (runIO $ readExistingFile ps) >>= \ ( path, content ) -> do
@@ -151,18 +115,6 @@ embedDir fp = do
151 e <- ListE <$> ((runIO $ fileList fp) >>= mapM (pairToExp fp))
115 e <- ListE <$> ((runIO $ fileList fp) >>= mapM (pairToExp fp))
152 return $ SigE e typ
116 return $ SigE e typ
153
117
154−-- | Embed a directory listing recursively in your source code.
155−--
156−-- > myFiles :: [FilePath]
157−-- > myFiles = $(embedDirListing "dirName")
158−--
159−-- @since 0.0.11
160−embedDirListing :: FilePath -> Q Exp
161−embedDirListing fp = do
162− typ <- [t| [FilePath] |]
163− e <- ListE <$> ((runIO $ fmap fst <$> fileList fp) >>= mapM strToExp)
164− return $ SigE e typ
165−
166-- | Get a directory tree in the IO monad.
118-- | Get a directory tree in the IO monad.
167--
119--
168-- This is the workhorse of 'embedDir'
120-- This is the workhorse of 'embedDir'
@@ -175,11 +127,7 @@ pairToExp _root (path, bs) = do
175 qAddDependentFile $ _root ++ '/' : path
127 qAddDependentFile $ _root ++ '/' : path
176#endif
128#endif
177 exp' <- bsToExp bs
129 exp' <- bsToExp bs
178− return $! TupE
179−#if MIN_VERSION_template_haskell(2,16,0)
180− $ map Just
181−#endif
182− [LitE $ StringL path, exp']
130+ return $! TupE [LitE $ StringL path, exp']
183
131
184bsToExp :: B.ByteString -> Q Exp
132bsToExp :: B.ByteString -> Q Exp
185#if MIN_VERSION_template_haskell(2, 5, 0)
133#if MIN_VERSION_template_haskell(2, 5, 0)
@@ -187,11 +135,7 @@ bsToExp bs =
187 return $ VarE 'unsafePerformIO
135 return $ VarE 'unsafePerformIO
188 `AppE` (VarE 'unsafePackAddressLen
136 `AppE` (VarE 'unsafePackAddressLen
189 `AppE` LitE (IntegerL $ fromIntegral $ B8.length bs)
137 `AppE` LitE (IntegerL $ fromIntegral $ B8.length bs)
190−#if MIN_VERSION_template_haskell(2, 16, 0)
138+#if MIN_VERSION_template_haskell(2, 8, 0)
191− `AppE` LitE (bytesPrimL (
192− let B.PS ptr off sz = bs
193− in mkBytes ptr (fromIntegral off) (fromIntegral sz))))
194−#elif MIN_VERSION_template_haskell(2, 8, 0)
195 `AppE` LitE (StringPrimL $ B.unpack bs))
139 `AppE` LitE (StringPrimL $ B.unpack bs))
196#else
140#else
197 `AppE` LitE (StringPrimL $ B8.unpack bs))
141 `AppE` LitE (StringPrimL $ B8.unpack bs))
@@ -212,8 +156,6 @@ stringToBs = B8.pack
212-- >
156-- >
213-- > myFile :: IsString a => a
157-- > myFile :: IsString a => a
214-- > myFile = $(embedStringFile "dirName/fileName")
158-- > myFile = $(embedStringFile "dirName/fileName")
215−--
216−-- Since 0.0.9
217embedStringFile :: FilePath -> Q Exp
159embedStringFile :: FilePath -> Q Exp
218embedStringFile fp =
160embedStringFile fp =
219#if MIN_VERSION_template_haskell(2,7,0)
161#if MIN_VERSION_template_haskell(2,7,0)
@@ -223,8 +165,6 @@ embedStringFile fp =
223
165
224-- | Embed a single existing string file in your source code
166-- | Embed a single existing string file in your source code
225-- out of list a list of paths supplied.
167-- out of list a list of paths supplied.
226−--
227−-- Since 0.0.9
228embedOneStringFileOf :: [FilePath] -> Q Exp
168embedOneStringFileOf :: [FilePath] -> Q Exp
229embedOneStringFileOf ps =
169embedOneStringFileOf ps =
230 (runIO $ readExistingFile ps) >>= \ ( path, content ) -> do
170 (runIO $ readExistingFile ps) >>= \ ( path, content ) -> do
@@ -266,7 +206,7 @@ fileList' realTop top = do
266 mapM (liftPair2 . second B.readFile)
206 mapM (liftPair2 . second B.readFile)
267 dirs <- filterM (doesDirectoryExist . snd) all' >>=
207 dirs <- filterM (doesDirectoryExist . snd) all' >>=
268 mapM (fileList' realTop . fst)
208 mapM (fileList' realTop . fst)
269− return $ sortBy (comparing fst) $ concat $ files : dirs
209+ return $ concat $ files : dirs
270
210
271liftPair2 :: Monad m => (a, m b) -> m (a, b)
211liftPair2 :: Monad m => (a, m b) -> m (a, b)
272liftPair2 (a, b) = b >>= \b' -> return (a, b')
212liftPair2 (a, b) = b >>= \b' -> return (a, b')
@@ -392,50 +332,3 @@ the magic key. If you know for certain that there will only be one dummy space
392available, you can use the non-@With@ variants.
332available, you can use the non-@With@ variants.
393
333
394-}
334-}
395−
396−-- | Take a relative file path and attach it to the root of the current
397−-- project.
398−--
399−-- The idea here is that, when building with Stack, the build will always be
400−-- executed with a current working directory of the root of the project (where
401−-- your .cabal file is located). However, if you load up multiple projects with
402−-- @stack ghci@, the working directory may be something else entirely.
403−--
404−-- This function looks at the source location of the Haskell file calling it,
405−-- finds the first parent directory with a .cabal file, and uses that as the
406−-- root directory for fixing the relative path.
407−--
408−-- @$(makeRelativeToProject "data/foo.txt" >>= embedFile)@
409−--
410−-- @since 0.0.10
411−makeRelativeToProject :: FilePath -> Q FilePath
412−makeRelativeToProject = makeRelativeToLocationPredicate $ (==) ".cabal" . takeExtension
413−
414−-- | Take a predicate to infer the project root and a relative file path, the given file path is then attached to the inferred project root
415−--
416−-- This function looks at the source location of the Haskell file calling it,
417−-- finds the first parent directory with a file matching the given predicate, and uses that as the
418−-- root directory for fixing the relative path.
419−--
420−-- @$(makeRelativeToLocationPredicate ((==) ".cabal" . takeExtension) "data/foo.txt" >>= embedFile)@
421−--
422−-- @since 0.0.15.0
423−makeRelativeToLocationPredicate :: (FilePath -> Bool) -> FilePath -> Q FilePath
424−makeRelativeToLocationPredicate isTargetFile rel = do
425− loc <- qLocation
426− runIO $ do
427− srcFP <- canonicalizePath $ loc_filename loc
428− mdir <- findProjectDir srcFP
429− case mdir of
430− Nothing -> error $ "Could not find .cabal file for path: " ++ srcFP
431− Just dir -> return $ dir </> rel
432− where
433− findProjectDir x = do
434− let dir = takeDirectory x
435− if dir == x
436− then return Nothing
437− else do
438− contents <- getDirectoryContents dir
439− if any isTargetFile contents
440− then return (Just dir)
441− else findProjectDir dir
README.md−2
@@ -1,6 +1,4 @@
1## file-embed
1## file-embed
2
2
3−![Tests](https://github.com/snoyberg/file-embed/workflows/Tests/badge.svg)
4−
5Use Template Haskell to read a file or all the files in a directory, and turn
3Use Template Haskell to read a file or all the files in a directory, and turn
6them into (path, bytestring) pairs embedded in your haskell code.
4them into (path, bytestring) pairs embedded in your haskell code.
file-embed.cabal+6−8
@@ -1,16 +1,16 @@
1name: file-embed
1name: file-embed
2−version: 0.0.15.0
2+version: 0.0.8.2
3−license: BSD2
3+license: BSD3
4license-file: LICENSE
4license-file: LICENSE
5author: Michael Snoyman <michael@snoyman.com>
5author: Michael Snoyman <michael@snoyman.com>
6maintainer: Michael Snoyman <michael@snoyman.com>
6maintainer: Michael Snoyman <michael@snoyman.com>
7synopsis: Use Template Haskell to embed file contents directly.
7synopsis: Use Template Haskell to embed file contents directly.
8description: Use Template Haskell to read a file or all the files in a
8description: Use Template Haskell to read a file or all the files in a
9 directory, and turn them into (path, bytestring) pairs
9 directory, and turn them into (path, bytestring) pairs
10− embedded in your Haskell code.
10+ embedded in your haskell code.
11category: Data
11category: Data
12stability: Stable
12stability: Stable
13−cabal-version: >= 1.10
13+cabal-version: >= 1.8
14build-type: Simple
14build-type: Simple
15homepage: https://github.com/snoyberg/file-embed
15homepage: https://github.com/snoyberg/file-embed
16extra-source-files: test/main.hs, test/sample/foo, test/sample/bar/baz,
16extra-source-files: test/main.hs, test/sample/foo, test/sample/bar/baz,
@@ -18,8 +18,7 @@ extra-source-files: test/main.hs, test/sample/foo, test/sample/bar/baz,
18 README.md
18 README.md
19
19
20library
20library
21− default-language: Haskell2010
22− build-depends: base >= 4.9.1 && < 5
21+ build-depends: base >= 4 && < 5
23 , bytestring >= 0.9.1.4
22 , bytestring >= 0.9.1.4
24 , directory >= 1.0.0.3
23 , directory >= 1.0.0.3
25 , template-haskell
24 , template-haskell
@@ -28,13 +27,12 @@ library
28 ghc-options: -Wall
27 ghc-options: -Wall
29
28
30test-suite test
29test-suite test
31− default-language: Haskell2010
32 type: exitcode-stdio-1.0
30 type: exitcode-stdio-1.0
33 main-is: main.hs
31 main-is: main.hs
34 hs-source-dirs: test
32 hs-source-dirs: test
35 build-depends: base
33 build-depends: base
36− , bytestring
37 , file-embed
34 , file-embed
35+ , HUnit
38 , filepath
36 , filepath
39
37
40source-repository head
38source-repository head
stack.yaml+5−1
@@ -1 +1,5 @@
1+flags: {}
2+packages:
3+- '.'
4+extra-deps: []
1−resolver: lts-14.17
5+resolver: lts-3.0
test/main.hs+4−16
@@ -1,28 +1,16 @@
1{-# LANGUAGE TemplateHaskell #-}
1{-# LANGUAGE TemplateHaskell #-}
2{-# LANGUAGE OverloadedStrings #-}
2{-# LANGUAGE OverloadedStrings #-}
3
3
4−import Control.Monad (unless)
5−import qualified Data.ByteString as B (ByteString, filter)
6import Data.FileEmbed
4import Data.FileEmbed
5+import Test.HUnit ((@?=))
7import System.FilePath ((</>))
6import System.FilePath ((</>))
8
7
9−infix 1 @?=
10−
11−(@?=) :: (Eq a, Show a) => a -> a -> IO ()
12−actual @?= expected = unless (actual == expected) (error $ "expected: " ++ show expected ++ "\n but got: " ++ show actual)
13−
14main :: IO ()
8main :: IO ()
15main = do
9main = do
16 let received = $(embedDir "test/sample")
10 let received = $(embedDir "test/sample")
17 received @?=
11 received @?=
12+ [ ("foo", "foo\r\n")
18− [ ("bar" </> "baz", "baz\r\n")
13+ , ("bar" </> "baz", "baz\r\n")
19− , ("foo", "foo\r\n")
20 ]
14 ]
21 let str = $(embedStringFile "test/sample/foo") :: String
15 let str = $(embedStringFile "test/sample/foo") :: String
22− filter (/= '\r') str @?= "foo\n"
16+ str @?= "foo\r\n"
23−
24− let mbs = $(embedFileIfExists "test/sample/foo")
25− fmap (B.filter (/= fromIntegral (fromEnum '\r'))) mbs @?= Just "foo\n"
26−
27− let mbs2 = $(embedFileIfExists "test/sample/foo2") :: Maybe B.ByteString
28− mbs2 @?= Nothing