Changes in version 2.21.0

• Overhaul handling of data declarations in XHTML and LaTeX. Adds support for documenting individual arguments of constructors/patterns (#709)

• Actually list all fixities for --hoogle (#871)

• Fix broken instance source links (#869)

• Avoiding line breaks due to ling line in the output of --hoogle (#868)

• Capture docs on type family instances (#867)

Changes in version 2.20.0

• Show where instances are defined (#748)

• @since includes package name (#452, #550, #749)

Changes in version 2.19.0.1

• Support for linking unicode operators (#458)

• Hyperlinker: Fix file handle leak in (#763)

Changes in version 2.19.0

• Haddock now supports tables in documentation inspired by reSTs grid tables

• --quickjump allows for quick navigation in documentation on hackage and other documentation hosting sites.

• A --reexport flag, which can be used to add extra modules to the top-level module tree

• Haddock no longer reports coverage statistics for hidden modules. By default cabal-install marks all package internal modules as hidden.

• Haddock now writes additional information about the documentation to meta.json

• Fix renaming of type variables after specializing instance method signatures (#613)

• Move markup related data types to haddock-library

• Fix: Show empty constraint contexts in pattern type signatures (#663)

• Fix: Generate constraint signatures for constructors exported as pattern synonyms (#663)

• The hyperlinker backend now uses the GHC lexer instead of a custom one. This notably fixes rendering of quasiquotes.

• Overhaul Haddock's rendering of kind signatures so that invisible kind parameters are not printed (#681) (Fixes #544)

• Recognise SPDX-License-Identifier as alias for License in module header parser (#743)

• Remove the response file related utilities, and use the ones that come with base (Trac #13896)

• Remove the response file related utilities, and use the ones that come with base (Trac #13896)

Changes in version 2.18.1

• Synopsis is working again (#599)

• Per-argument documentation on class methods working again (#647)

• Support user defined signatures on pattern synonyms

• Support for bundled pattern synonyms (#494, #551, #626)

Changes in version 2.17.4

• Fix 'internal error: links: UnhelpfulSpan' (#554, #565)

• Hyperlink backend knows about DataKinds (#510)

• Fix rendering of class methods for Eq and Ord (#549)

• Export MDoc and toInstalledIface from Haddock.Types

Changes in version 2.17.3.1

• Disable NFData instances for GHC types when GHC >= 8.0.2 (#537)

Changes in version 2.17.3

• Remove framed view of the HTML documentation

Changes in version 2.17.2

• Fix portability of documentation building within GHC

Changes in version 2.17.1

• Included with GHC 8.0.1

• Fixed Makefile for GHC installation

• Fixed clean rule of GHC Makefile

Changes in version 2.17.0 (not released)

• Support typesetting of mathematical expressions via Mathjax (#397)

• Describe orphan instances defined in a module in its documentation (#449)

• Produce specialized type signatures for typeclass methods (#425)

• Support GCC-like response files (#470)

Changes in version 2.16.2

• Generate hyperlinked source ourselves (#410, part of GSOC 2015)

• Fix expansion icon for user-collapsible sections (#412)

• Break up response file arguments on newlines

• Various HTML fixes (#301, #406, #407, #421)

• Line anchors in hyperlinked source (#420)

Changes in version 2.16.1

• Don't default to type constructors for out-of-scope names (#253 and #375)

• Fix Hoogle display of constructors (#361)

• Fully qualify names in Hoogle instances output (#263)

• Output method documentation in Hoogle backend (#259)

• Don't print instance safety information in Hoogle (#168)

• Expand response files in arguments (#285)

• Build the main executable with -threaded (#399)

• Use SrcSpan of declarations for inferred type sigs (#207)

• Fix cross-module instance locations (#383)

• Fix alignment of Source link for instances in Firefox (#384)

Changes in version 2.16.0

• Experimental collapsible header support (#335)

• Add support for markdown links and images

• Allow an optional colon after the closing bracket of definition lists. This is to disambiguate them from markdown links and will be require with a future release.

• Fix re-exports of built-in type families (#310)

• Fix parsing of infix identifiers such as elem.

• Print missing docs by default and add --no-print-missing-docs

• parser: now parses out some meta data too, breaking the API

• parser: markdown syntax for images and URLs is now accepted: <> style for images and style for links is now considered deprecated. for links is still OK.

• parser: add support for @since element: this is paragraph-level element of the form ‘@since x.y.z’ where x.y.z is the version number. The way it is rendered is subject to change.

• properly render package ID (not package key) in index (#329)

• links to source location of class instance definitions

• Fix code blocks in presence of Windows line endings

• Deal better with long synopsis lines (#151)

Changes in version 2.15.0

• Always read in prologue files as UTF8 (#286 and Cabal #1721)

• parser: don't wrap headers in DocParagraph (#307)

• parser: don't mangle append order for nested lists (pandoc #1346)

• parser: preserve list ordering in certain scenarios (#313)

• parser: update the attoparsec version used internally giving slight parsing performance boost.

• Move development to be against latest GHC release and not GHC HEAD.

• Further split up the package to separate the executable from the library, necessary by things like GHCJS. We now have ‘haddock-library’ which are the parts that don't use GHC API, ‘haddock-api’ which are (some of) the parts that do use GHC API and ‘haddock’ which merely provides the executable.

• Export few extra functions in the API.

• Add compatibility with GHC 7.8.2.

• Omit unnecessary ‘forall’s (#315 and #86)

• Remove some files which were really old or did not belong in the repository in the first place.

Changes in version 2.14.3

• Fix parsing of identifiers with ^ or ⋆ in them (#298)

• Fix anchors (#308)

Changes in version 2.14.2

• Always drop --split-objs GHC flag for performance reasons (#292)

• Print kind signatures GADTs (#85)

• Drop single leading whitespace when reasonable from @-style blocks (#201)

• Fix crashes associated with exporting data family record selectors (#294)

Changes in version 2.14.1

• Render * and -> with their UnicodeSyntax equivalents if -U is enabled

• Display minimal complete definitions for type classes

• Hide right hand side of TF instances with hidden names on the RHS

Changes in version 2.14.0

• Print entities with missing documentation (#258)

• Print a warning message when given -optghc instead of --optghc (#5)

• Add --compatible-interface-versions (#231)

• Allow to generate latex documentation for FFI declarations (#247)

• Add copyright and license information to generated documentation

• Improved to Unicode support

• Bold markup support

• Nested paragraphs

• Better escaping

• Header markup

• Parser should no longer fail to parse any markup

• {-# OPTIONS_HADDOCK show-extensions #-} pragma will show the GHC extensions enabled in the module.

• Properly render License field (#271)

• Print type/data family instances (for exported types only)

• Fix display of poly-kinded type operators (#189)

• PatternSynonyms support

• Fix display of implicit parameters (#260)

• Fix rendering of Contents when links are present (#276)

• Fix documentation duplication on record fields (#195)

• Add --source-entity-line for exact line links (eg. things defined inside TH splices) (#79)

• Display fixity information for names with nonstandard fixities

• Bird tracks specified like "> code" no longer suffer from an extra leading space in the code output

Changes in version 2.13.2

• Handle HsExplicitListTy in renamer (#213)

• Allow haddock markup in deprecation messages

• Export more types from Documentation.Haddock

• Include everything that is required to run the test suite with the cabal package (#230)

Changes in version 2.13.1

• Hide instances that are "internal" to a module

• Add support for properties in documentation

• Fix a bug with spurious superclass constraints

• Fix and extend the Haddock API

Changes in version 2.12.0

• Labeled URLs (e.g <http://example.net/ some label>)

• Improved memory usage (new dependency: deepseq)

Changes in version 2.11.0

• Show deprecation messages for identifiers

• List identifiers declared on the same line (with a common type) separately

• Don't crash on unicode strings in doc comments

• Fix reporting of modules safe haskell mode

• Fix a case where we were generating invalid xhtml

• Improved --qual option (no crashes, proper error messages)

• A new --qual option "aliased" which qualifies identifiers by the module alias used in the source code

• The Haddock API restores GHC's static flags after invocation

• Access to unexported identifiers through the Haddock API again

Changes in version 2.10.0

• Require GHC >= 7.4

• Safe Haskell indications on module pages

• Type declarations on identifiers no longer necessary

• Add flag --interface-version

• Warn when comment refers to in-scope identifier without documentation

• Bug fix: links to out-of-scope things (#78)

• Bug fix: module references to other packages work again

Changes in version 2.9.4

• Require GHC >= 7.2

• Support Alex 3.x

Changes in version 2.9.3

[This is the version that comes with GHC 7.2.1 although it claims it's 2.9.2!]

• Build with GHC 7.2.1

• Support blank lines in results of examples

• A type signature for multiple names generates one signature in the output

• Minor bug fixes

Changes in version 2.9.2

• Build with GHC 7.0.2

• Write Hoogle output in utf8; fixes GHC build on Windows

Changes in version 2.9.1

• Fix build in GHC tree

• Improve .cabal file

Changes in version 2.9.0

• Drop support for ghc < 7

• New flag --qual for qualification of names

• Print doc coverage information to stdout when generating docs

• Include an 'All' option in the A-Z subdivided index

• Make TOC group header identifiers validate

• Minor changes to the API

Changes in the version that comes with GHC 7.0.1

[This version claims it is 2.8.0 but is actually based on 2.8.1]

• Fix URL creation on Windows: Use / not \ in URLs.

• Support GHC 7.0

Changes in version 2.8.1

• Fix build on Windows with MinGW

Changes in version 2.8.0

• HTML backend completely rewritten to generate semantically rich XHTML using the xhtml package.

• New default CSS based on the color scheme chosen for the new Haskell wiki, with a pull-out tab for the synopsis.

• Theme engine based on CSS files. Themes can be switched from the header menu. (New flags --built-in-themes and --theme. The latter is an alias for --css which now has extended semantics).

• Markup support for executable examples/unit-tests. To be used with an upcoming version of the DocTest program.

• Addition of a LaTeX backend.

• Frames-mode can be enabled from the header menu.

• Path to source entities can be specified per package, so that source links work for cross-package documentation.

• Support for a second form of enumerated lists (1. 2. etc).

• Additions and changes to the Haddock API.

• New flag --no-tmp-comp-dir to tell Haddock to write and pick up compilation files (.o, .hi, etc) to/from GHC's output directory instead of a temporary directory.

• Various bug fixes.

---

Changes in version 2.6.1 (bug fix release from the stable branch)

• Fix #128

---

Changes in version 2.7.2

• Add Paths_haddock to library

---

Changes in version 2.7.1:

• Fix problems with library part of .cabal file

---

Changes in version 2.7.0:

• Instances can be commented

• The Haddock API now exposes more of the internals of Haddock

• Bug fixes (most importantly #128)

---

Changes in version 2.6.0:

• Drop support for GHC 6.10.*

• Add support for GHC 6.12.1

• Cross-package documentation: full documentation show up when re-exporting things coming from external packages

• Lexing and parsing the Haddock comment markup is now done in Haddock again, instead of in GHC

• Slightly prettier printing of instance heads

• Support platforms for which GHC has no native code generator

• Add a flag --print-ghc-libdir

• Minor bug fixes

---

Changed in version 2.5.0:

• Drop support for GHC 6.8.*

• Add support for GHC 6.10.3 and 6.10.4

• Revert to the old multi-page index for large packages (#106)

• Show GADT records in the generated documentation

• Create output directory if it doesn't exist (#104)

• Use the native codegen instead of compiling via C for TH modules

• Add --use-unicode flag for displaying prettier versions of common symbols

• Multiple verbosity levels: remove --verbose and add --verbosity=n

---

Changed in version 2.4.2:

• Support GHC 6.10.2

• Haddock no longer crashes on Template Haskell modules (#68) (only with GHC 6.10.2 or above)

• Fix problem with Template Haskell-generated declarations disappearing (#59)

• Generate two anchors for each link for compatibility between IE and Opera (#45)

• Improved error messages

• Show re-exports from external packages again (GHC ticket #2746)

• Store hidden modules in .haddock files again (needed by the haddock library)

• Avoid processing boot modules

• Pragmas may exist between document comments and declarations

• Do not indicate that a constructor argument is unboxed

• Fix problem with non-working links to ghc-prim

• Allow referring to a specific section within a module in a module link (#65)

• Fixes to the Hoogle backend

• Improvements to the haddock library

• Many other fixes (including #67, #69, #58, #57)

---

Changed in version 2.4.1:

• Depend on base 4.* when GHC >= 6.9, otherwise 3.*

---

Changed in version 2.4.0:

• Add framed view of the HTML documentation

• Build with GHC 6.8.2 and 6.8.3 again

• Support images in documentation comments again

• Small improvements to the Hoogle output

• A few bugs has been fixed

---

Changed in version 2.3.0:

• Support for GHC 6.10.1

• Slightly improved space usage

• Fix a bug that made hidden modules show up in the contents & index pages

• Fix a bug that made Haddock load modules twice

• Improvements to the Hoogle output

---

Changed in version 2.2.2:

• Relax version dependency on ghc-paths

---

Changes in version 2.2.1:

• Support for GHC 6.8.3

• The Hoogle backend is back, thanks to Neil Mitchell. The plan is to be compatible with the upcoming Hoogle 4 pre-release

• Show associated types in the documentation for class declarations

• Show type family declarations

• Show type equality predicates

• Major bug fixes (#1 and #44)

• It is no longer required to specify the path to GHC's lib dir

• Remove unnecessary parenthesis in type signatures

---

Changes in version 2.1.0:

• Fix a bug that made links point to the defining module instead of the "best" one (e.g Int pointing to GHC.Base instead of Data.Int)

• Fix a couple of smaller bugs

• The representation of DocName was changed in the library

• Add a flag --no-warnings for turning off warnings

---

Changes in version 2.0.0.0:

• The GHC API is used as the front-end

• Haddock now understands all syntax understood by GHC 6.8.2

• Haddock can generate documentation for some of the language extensions in GHC 6.8.2

• Format of module attributes has changed. The only way of specifying module attributes is via a new OPTIONS_HADDOCK pragma. Example: {-# OPTIONS_HADDOCK hide, prune #-}

• Haddock understands literate source files

• Add a small library to read Haddock's interface files

• Add a flag -B for passing the path to the GHC lib dir

• Add a flag --optghc for passing options to GHC

• Add a flag --ghc-version for printing the GHC version

• Remove --use-package, --allow-missing-html, --ghc-pkg, in favour of only supporting --read-interface

• Remove --package flag, the GHC flag -package-name can be used instead

• Remove --no-implicit-prelude flag, the GHC flag -XNoImplicitPrelude can be used instead

---

Changes in version 0.9:

• Infix type operators, e.g., first :: a~>a' -> (a,b)~>(a',b)

• Add a search box to the index page which automatically narrows the index to the search as you type (thanks to Neil Mitchell).

• Add a --ghc-pkg flag

• Add a flag --allow-missing-html

• URL expansion for %%, %L, %{LINE}

• added substitution %{FILE///c}

• Lexing of /.../ is now more like '...', in that a / character must be matched by another / character on the same line, otherwise it is treated as a literal '/'. This removes a common source of accidental parse errors in documentation.

• Various bugs were fixed.

• Cabal 1.2 is now required, and Haddock builds with GHC 6.8.x.

---

Changes in version 0.8:

• Haddock has a Cabal build system, and will build on Windows without Cygwin or MSYS. GHC 6.4 or later is required.

• New options: --comments-base, --comments-module, --comments-entity for generating links to pages (eg. wiki) for collecting user comments.

• New options: --source-base, --source-module, --source-entity for generating links to source code. Haddock now understands {-# LINE #-} pragmas, which means it can figure out the correct name for the source file even if the file is preprocessed.

• Haddock generates output for populating the Hoogle search engine.

• New markup <> for including images.

---

Changes in version 0.7:

• Changes in the way Haddock decides where to direct hyperlinks. Each entity

  is now assigned a single "home" module, and all hyperlinks are directed to that module. See the docs ("Hyperlinking and re-exported entities") for details.

• New options --ignore-all-exports, --hide

• New option --use-package for creating documentation that hyperlinks to the HTML documentation for existing packages on your system. It works by querying ghc-pkg for the location of the Haddock interface and HTML for the given package.

• Parts of the HTML documentation, notably lists of instances, are now "collapsible" with a +/- button. Also, the contents page is now in the form of tree in which subtrees can be collapsed.

• Support for Microsoft DevHelp and HtmlHelp 2.0 formats.

• Support for a short description for each module for the contents page.

• Compiles with GHC 6.4+

• Various bugfixes

---

Changes in version 0.6:

• Implicit parameters, zip comprehensions and 'mdo' are now supported by the parser.

• Some lexical bugs were fixed, mainly concerning literal paragraphs next to non-literal paragraphs.

• New options: --gen-index, --use-index, --gen-contents and --use-contents, for generting a combined index and contents for several libraries from the appropriate .haddock files.

• There is now one index rather than separate Function/Constructor and Type/Class indices. Where a name refers to several entities, these are listed separately in the index.

• New option: -v, elicits more verbose warnings. Some warnings are now turned off by default; Haddock should be a little less noisy in general.

• Markup for definition lists has been added. See the documentation for details.

• New option: --package for setting the package name. The package is listed alongside each module name in the combined contents.

• Entities which are re-exported from another package now at least leave a hyperlink in the generated HTML, rather than nothing at all.

• Some fixes for bugs which caused incorrect hyperlinks in the generated HTML. In particular, instances should now be linked correctly.

• Some aesthetic improvements to the generated HTML.

---

Changes in version 0.5:

• Compiles with recent versions of GHC.

• A few bugs have been fixed.

• New labelling/linking feature (see "Anchors" in the manual).

---

Changes in version 0.4:

• Import declarations which list entities in parentheses, or with hiding clauses, are now properly supported. Modulo one or two small infelicities, the full Haskell modules system is now supported.

• Haddock is now more flexible about the placing of separators (commas, semicolons) in relation to doc comments.

• There is support for generating and reading "interface files" which describe the exports of a set of modules. This is useful for generating documentation which hyperlinks to previously-generated documentation.

• Support for generating the extra files required by the Microsoft Help compiler.

• New option: --prologue specifies a file of documentation which is placed on the contents page.

• Many bugs fixed

---

Changes in version 0.3:

• Documentation on individual function arguments is now implemented

• Links can be made to identifiers that aren't in scope, by using the fully qualified name.

• Instances are collected and listed with the appropriate classes and datatypes (not for derived instances yet).

• Single quotes are only interpreted specially when they surround a legal Haskell identifier, otherwise they are treated literally.

• Bird-tracked text is now literal. If you want marked-up text in a code block, use the @...@ notation instead.

• Various changes to the layout, it generally looks nicer now.

• Various bugs fixed.

---

Changes in version 0.2:

• The [...] markup for typewriter font has been changed to @...@.

• Module attributes introduced (see the documentation for details).

• {- ... -} style comments may now be used for documentation annotations

• Recursive modules are detected and reported as an error.

• Existential constructors and rank-N types are now groked by the parser

• Some type rendering cleaned up

• `abc' is accepted as well as 'abc' to markup an identifier

• Several bugs fixed, and error messages improved.