Data.Stack.Yaml

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 ([e-mail])

Documentation

data Package

Constructors

LocalPkg FilePath

RemotePkg RemotePkgConf

Instances

Eq Package

Methods

(==) :: Package -> Package -> Bool

(/=) :: Package -> Package -> Bool

Show Package

Methods

showsPrec :: Int -> Package -> ShowS

show :: Package -> String

showList :: [Package] -> ShowS

FromJSON Package

Methods

parseJSON :: Value -> Parser Package

parseJSONList :: Value -> Parser [Package]

data RemotePkgConf

Constructors

RemotePkgConf

Fields

• gitUrl :: Text
• commit :: Text
• extraDep :: Bool

Instances

Eq RemotePkgConf

Methods

(==) :: RemotePkgConf -> RemotePkgConf -> Bool

(/=) :: RemotePkgConf -> RemotePkgConf -> Bool

Show RemotePkgConf

Methods

showsPrec :: Int -> RemotePkgConf -> ShowS

show :: RemotePkgConf -> String

showList :: [RemotePkgConf] -> ShowS

FromJSON RemotePkgConf

Methods

parseJSON :: Value -> Parser RemotePkgConf

parseJSONList :: Value -> Parser [RemotePkgConf]

data StackConfig

Constructors

StackConfig

Fields

• resolver :: Text
• packages :: [Package]
• extraDeps :: [Text]

Instances

Eq StackConfig

Methods

(==) :: StackConfig -> StackConfig -> Bool

(/=) :: StackConfig -> StackConfig -> Bool

Show StackConfig

Methods

showsPrec :: Int -> StackConfig -> ShowS

show :: StackConfig -> String

showList :: [StackConfig] -> ShowS

FromJSON StackConfig

Methods

parseJSON :: Value -> Parser StackConfig

parseJSONList :: Value -> Parser [StackConfig]

parseStackYaml :: ByteString -> Maybe StackConfig

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

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