v1.42.1

• Add several new entrypoints to Dhall module [#2534] / [#2544]
• Build against latest versions of:
  • ansi-terminal
  • optparse-applicative
  • optparse-generic
  • lens
  • template-haskell [#2532] / [#2542]
  • unix-compat

1.42.0

• Supports standard version 23.0.0
  • BREAKING CHANGE TO THE API AND LANGUAGE: Language support for Bytes literals
    • This is a breaking change to the API due to adding new Bytes and BytesLiteral constructors to the Expr type
    • This is a breaking change to the language now that Bytes is a reserved identifier
  • BREAKING CHANGE TO THE API AND LANGUAGE: New {Date,Time,TimeZone}/show builtins
    • This is a breaking change to the API due to adding new {Date,Time,TimeZone}Show constructors to the Expr type
    • This is a breaking change to the language now that {Date,Time,TimeZone}/show are not reserved identifiers
• BREAKING CHANGE: dhall lint no longer sorts let bindings
  • This had to be removed because the old behavior was not always correct
  • The old behavior would sometimes change the behavior of a Dhall program or break the program
  • Out of an abundance of caution we're disabling the feature until it can be properly fixed (which is't trivial)
• BUG FIX: Fix pretty-printing of Time literals
  • The pretty-printer was stripping leading zeros from the fractional component
    of seconds
• BUG FIX: Fix custom normalizers to work for things other than functions
  • Before this change you could extend the language with custom functions, but
    not custom values (e.g. foo = 1)
• BUG FIX: Don't URL encode path components
  • The pretty-printer was URL-encoding path components, which is not correct (according to the standard)
  • URL path components are supposed to be already URL-encoded by the user and left undisturbed by the interpreter (which is now what it correctly does)
• New dhall package command: #2478, #2508
  • This command makes it easier to turn a directory full of Dhall expressions
    into a dhall package (e.g. package.dhall)
• Improved dhall to-directory-tree subcommand
  • The dhall to-directory-tree subcommand now optionally supports specifying
    metadata for generated paths
  • For a worked example, see: https://github.com/dhall-lang/dhall-haskell/blob/main/dhall/examples/to-directory-tree.dhall
• dhall freeze --cache --all is now idempotent: #2486, #2500
  • Before this change a second run would fail due to attempting to resolve
    the missing import it would generate
• New Template Haskell options for adding strictness annotations to generated Haskell types
• Template Haskell can now generate higher-kinded Haskell types from higher-kinded Dhall types
• New Dhall.Freeze utilities for working with custom evaluators
• Add Data instances for Import and various other types
• Add Eq instances for InvalidDecoder and ExtractError

1.41.2

• BUG FIX: Fix :hash REPL command to α-normalize input
• Add {From,To}Dhall instances for DayOfWeek
• Add {From,To}Dhall instances for ShortText
• Performance improvements
  • #2423
• Fixes and improvements to haddocks
  • #2396
• Fixes and improvements to test suite
  • #2342
  • #2394
• Build against newer dependencies
  • pretty-simple-4.1
  • aeson-2.1
  • vector-0.13
  • turtle-1.6

1.41.1

1.41.1

• BUG FIX: Don't escape ? path component when pretty-printing with expressions

1.41.0

• Support standard version 22.0.0
  • Allow with expressions to update Optional values using ?
  • Add showConstructor keyword
• BUG FIX: Fix pretty-printing of time zones
  • Timezones with a negative offset were previously being rendered with two
    leading minus signs instead of one
• BUG FIX: dhall freeze --cache to work with standard version 21.0.0
  • dhall freeze will now use missing sha256:… for the first import so that
    the latter import will be tried if the import is not in cache
  • The old behavior is incompatible with standard version 21.0.0 because the
    new behavior of the ? operator doesn't fall back on hash mismatches
• BUG FIX: Allow with expression to update a field named Some
  • This fixes a discrepancy between the Haskell implementation and the standard
    where the Haskell implementation would not permit
    { Some = 0 } with Some = 1
• Fix dhall {format,lint,freeze} to preserve leading shebangs
• Add FromDhall instances for Int{8,16,32,64}

1.40.2

• Supports standard version 21.1.0
  • The interpreter now supports customizing headers using a headers.dhall
    configuration file
  • Generalize grammar for certain annotations
  • Add support for a trailing line comment without a newline
• BUG FIX: dhall repl no longer ignores type annotations on :let commands
  • Before this fix, :let x : T = 3 would ignore the : T type annotation
• BUG FIX: Don't accept a bar after an empty union
  • Before this fix, the interpreter would accept something like <>|, which
    is not valid according to the standard grammar
• New FromDhall/ToDhall instances for Day/TimeOfDay/TimeZone #2294 #2300
  • These types correspond to the recent temporal literals added to the
    language
• New subExpressionsWith Traversal
• Add Template Haskell support for modifying field names in generated Haskell
  types
  • This adds a new makeHaskellTypesWith utility with takes a
    GenerateOptions function argument for customizing the code-generation
    logic
  • This comes in handy when Dhall fields have names are reserved keywords in
    Haskell code. You can now transform the Haskell field names to avoid
    collisions
• Support GHC 9.2
• Fixes and improvements to documentation
  • #2290
• Fixes and improvements to error messages
  • #2303

1.40.1

• BUG FIX: Fix equivalence check for Date / Time / TimeZone
  • This fixes a serious bug in the recently introduced support for temporal
    literals where they would fail to type-check when given a correct type
    annotation or when they were checked against an existing type
  • For example, 00:00:00 : Time was failing to type-check

1.40.0

• Almost supports version 20.2.0 of the standard
  • The main thing that is missing is support for the headers.dhall file
  • BREAKING CHANGE TO THE LANGUAGE: Add support for Date / Time / TimeZone
    • This is a breaking change because Date, Time, and TimeZone are
      now reserved identifiers
  • Improved fallback behavior for ?
• BREAKING CHANGE TO THE LANGUAGE: Require whitespace before with
  • The parser now requires whitespace before the with keyword, which brings
    the Haskell implementation into closer compliance with the standard
  • In practice this is a technically breaking change which will not affect
    most programs
• New FromDhall instances for Predicate, Equivalence, and Op
• dhall lint will now sort let bindings with imports
  • dhall lint now reorders let bindings to move imports to the top so
    long as doing so does not change the behavior of the program
• Fixes and improvements to code formatting
  • #2280
• Fixes and improvements to error messages
  • #2244
  • #2238

1.39.0

• Supports version 20.2.0 of the standard
  • Add support for Unix shebangs
• BREAKING CHANGE TO THE API: dhall {format,freeze,lint} now accept multiple
  files
  • The --inplace flag is no longer necessary and you can now specify
    multiple files to update in place on the command line, like
    dhall format foo.dhall bar.dhall
  • The --inplace flag is still accepted, but does nothing, and will emit a
    warning
  • This is a breaking change to the API for formatting/freezing/linting files
    because now you can specify multiple inputs instead of one input
• BREAKING CHANGE: Pre-6.0.0 hashes are no longer supported
  • The interpreter no longer provides backwards compatibility for integrity
    checks computed before standard version 6.0.0
  • This is a breaking change to the API of the Dhall.Binary module, where
    certain utilities are no longer parameterized on a StandardVersion
  • This is also a breaking change to any Dhall code that depended on these
    really old integrity checks
• BUG FIX: Formatting ≡ now correctly preserves the original character set
• BUG FIX: Don't panic on Text/replace ""
• Quasiquotation support for Dhall
  • You can now convert a Dhall expression to the corresponding syntax tree
    using a quasiquoter like this: [dhall| \x -> x + 2 ]
• New Dhall.Marshal.{Encode,Decode} modules
  • These modules split up the Dhall module into two smaller modules for
    encoding and decoding logic, respectively
  • The Dhall module still re-exports the same functionality as before, so
    this is not a breaking change
• Support GHC 9.0.1
• Fixes and improvements to code formatting
  • Improve pretty-printing of sha256

1.38.1

• Add INLINABLE annotations in more places
  • This may improve performance by enabling more specializations
• Fix hashable-related test failures
• Fix support for GHC 8.4.4
  • … by using GeneralizedNewtypeDeriving (with a z)
• Allow doctest-0.18
• Allow bytestring-0.11