Safe Haskell	None
Language	Haskell2010

Data.Stack.Yaml

Description

Parse a stack.yaml file

credit: stack2nix v. 0.1.2.0
https://hackage.haskell.org/package/stack2nix-0.1.2.0/docs/Stack2nix.html
author: Jacob Mitchell ([email protected])

Synopsis

Documentation

data Package Source #

Constructors

LocalPkg FilePath
RemotePkg RemotePkgConf

Instances

Eq Package Source #
Methods (==) :: Package -> Package -> Bool # (/=) :: Package -> Package -> Bool #
Show Package Source #
Methods showsPrec :: Int -> Package -> ShowS # show :: Package -> String # showList :: [Package] -> ShowS #
FromJSON Package Source #
Methods parseJSON :: Value -> Parser Package # parseJSONList :: Value -> Parser [Package] #

data RemotePkgConf Source #

Constructors

RemotePkgConf
Fields gitUrl :: Text commit :: Text extraDep :: Bool

Instances

Eq RemotePkgConf Source #
Methods (==) :: RemotePkgConf -> RemotePkgConf -> Bool # (/=) :: RemotePkgConf -> RemotePkgConf -> Bool #
Show RemotePkgConf Source #
Methods showsPrec :: Int -> RemotePkgConf -> ShowS # show :: RemotePkgConf -> String # showList :: [RemotePkgConf] -> ShowS #
FromJSON RemotePkgConf Source #
Methods parseJSON :: Value -> Parser RemotePkgConf # parseJSONList :: Value -> Parser [RemotePkgConf] #

data StackConfig Source #

Constructors

StackConfig
Fields resolver :: Text packages :: [Package] extraDeps :: [Text]

Instances

Eq StackConfig Source #
Methods (==) :: StackConfig -> StackConfig -> Bool # (/=) :: StackConfig -> StackConfig -> Bool #
Show StackConfig Source #
Methods showsPrec :: Int -> StackConfig -> ShowS # show :: StackConfig -> String # showList :: [StackConfig] -> ShowS #
FromJSON StackConfig Source #
Methods parseJSON :: Value -> Parser StackConfig # parseJSONList :: Value -> Parser [StackConfig] #

parseStackYaml :: ByteString -> Maybe StackConfig Source #

parse a stack.yaml file.

example:

 import qualified Data.ByteString as BS
 maybeConfig <- parseStackYaml <$> BS.readFile "stack.yaml"

or:

>>> import qualified Data.ByteString.Char8 as BSC
>>> import Data.Maybe (fromJust)
>>> 'a'
'a'
>>> let yaml = BSC.pack $ unlines [ "resolver: lts-8.24" , "packages:" , "- ." , "extra-deps: []" , "flags: {}" , "extra-package-dbs: []" ]
>>> let config = fromJust $ parseStackYaml yaml
>>> config
StackConfig {resolver = "lts-8.24", packages = [LocalPkg "."], extraDeps = []}

getResolver :: IO Text Source #

Look for a stack.yaml file in the working directory, extract the 'resolver:' field, and return it as Text.