Data.FileEmbed

This module uses template Haskell. Following is a simplified explanation of usage for those unfamiliar with calling Template Haskell functions.

The function embedFile in this modules embeds a file into the exceutable that you can use it at runtime. A file is represented as a ByteString. However, as you can see below, the type signature indicates a value of type Q Exp will be returned. In order to convert this into a ByteString, you must use Template Haskell syntax, e.g.:

$(embedFile "myfile.txt")

This expression will have type ByteString. Be certain to enable the TemplateHaskell language extension, usually by adding the following to the top of your module:

{-# LANGUAGE TemplateHaskell #-}

Embed at compile time

embedFile :: FilePath -> Q Exp

Embed a single file in your source code.

import qualified Data.ByteString

myFile :: Data.ByteString.ByteString
myFile = $(embedFile "dirName/fileName")

embedOneFileOf :: [FilePath] -> Q Exp

Embed a single existing file in your source code out of list a list of paths supplied.

import qualified Data.ByteString

myFile :: Data.ByteString.ByteString
myFile = $(embedFile' [ "dirName/fileName", "src/dirName/fileName" ])

embedDir :: FilePath -> Q Exp

Embed a directory recursively in your source code.

import qualified Data.ByteString

myDir :: [(FilePath, Data.ByteString.ByteString)]
myDir = $(embedDir "dirName")

getDir :: FilePath -> IO [(FilePath, ByteString)]

Get a directory tree in the IO monad.

This is the workhorse of embedDir

Inject into an executable

dummySpace :: Int -> Q Exp

inject

Arguments

:: ByteString

bs to inject

-> ByteString

original BS containing dummy

-> Maybe ByteString

new BS, or Nothing if there is insufficient dummy space

injectFile

Arguments

:: ByteString

-> FilePath

template file

-> FilePath

output file

-> IO ()

Internal

stringToBs :: String -> ByteString

bsToExp :: ByteString -> Q Exp