# doclayout

## 0.4

  * Expose `unfoldD` [API change].
  * Remove `realLengthNoShortcut`, `isEmojiModifier`, and
    `isEmojiJoiner` [API change] (Stephen Morgan).
  * Add new exported functions `realLengthNarrowContext`,
    `realLengthWideContext`, `realLengthNarrowContextNoShortcut`,
    `realLengthWideContextNoShortcut`, `isSkinToneModifier`, `isZWJ`
    [API change] (Stephen Morgan).
  * Compute `realLength` strictly.
  * Make `getOffset` stricter.
  * Drop support for ghc <= 8.4, add test for ghc 9.2.
  * Don't collapse the CarriageReturn + Newline combination (#20).
    We want to ensure that a literal starting with a Newline
    doesn't lose the newline if it occurs after a CarriageReturn.
    This affects code blocks in pandoc that begin with newlines.
  * Improve performance of NoShortcut code (Stephen Morgan).
  * Simplify emoji processing (Stephen Morgan).
  * Add benchmarking for code with no shortcuts (Stephen Morgan).
  * Add unicodeWidth.inc to cabal file.
  * Fix `offset`, `minOffset`, `updateColumn` so they don't re-render.
  * Get unicode block widths directly from the Unicode specification, rather
    than writing it out ourselves (Stephen Morgan).
  * Resolve the width of ambiguous characters based on their context
    (Stephen Morgan).
  * Spacing marks should have nonzero width, even though they are combining
    characters (Stephen Morgan).
  * Add shortcuts for extended Latin, Arabic, Cyrillic, Greek,
    Devangari, Bengali, Korean, Telugu, and Tamil (Stephen Morgan).
  * Fix location of extra-source-files in cabal.
  * update.hs: require text package
  * Handle emoji variation modifiers specially, so the keypad emoji can be
    ignored (Stephen Morgan).  This results in a 16% speedup of realLength
    on ascii text.
  * Add benchmarks for all scripts used by more than 50 million people, plus
    a couple more. (#9, Stephen Morgan).

## 0.3.1.1

  * Fix the end of the block of zero width characters which contains
    the zero-width joiners and directional markings (Stephen Morgan, #5).
    This fixes a regression introduced in 0.3.1, affecting code
    points 0x2010 to 0x2030.

## 0.3.1

  * Improved handling of emojis.  Emojis are double-wide, but
    previously this library did not treat them as such.  We now
    have comprehensive support of emojis, including variation
    modifiers and zero-width joiners, verified by a test suite.
    Performance has been confirmed to be no worse for text without emojis.
    (Stephen Morgan, #1).  API changes: export `realLengthNoShortcut`,
    `isEmojiModifier`, `isEmojiVariation`, `isEmojiJoiner`.

## 0.3.0.2

 * NOINLINE `literal` instead of `fromString` (#2, sjakobi).
   This produces a further reduction in allocations and
   pandoc compile time.

## 0.3.0.1

 * NOINLINE `fromString` (#1).
   @sjakobi reports that this change reduced total allocations
   for building pandoc-2.12 with GHC 8.10.4 by 8.5% and reduced
   peak allocations are reduced from 3854MB to 3389MB.

## 0.3

  * Add foldlChar to signature of HasChars [API change].
  * Use foldlChar in realLength. This avoids a stack overflow
    we were getting with long strings in the previous version
    (with foldrChar).  See jgm/pandoc#6031.
  * Replace isBlank with isBreakable and improved startsWithBlank.
    Previously isBlank was used in the layout algorithm where
    what we really wanted was isBreakable.
  * Avoid unnecessary calculation in updateColumns.
  * Replace a right fold with a strict left fold.
  * Add strictness annotations in realLength and updateColumn.

## 0.2.0.1

  * Made `realLength` smarter about combining characters.
    If a string starts with a combining character, that character
    takes up a width of 1; if the combining character occurs after
    another character, it takes 0.  See jgm/pandoc#5863.
  * Improve `isBlank`, re-use in rendering code `for BreakingSpace`.
  * Fixed incorrect `Text` width in renderig blocks.

## 0.2

  * Add instances for `Doc`: `Data`, `Typeable`, `Ord`, `Read`, `Generic`.
  * Add `literal` (like `text`, but polymorphic).
  * Change some `IsString` constraints to `HasChars`.
  * Add some default definitions for methods in `HasChars`.
  * Change `offset` and `minOffset` to be more efficient (in
    simple cases they no longer render and count line lengths).
  * Add `updateColumn`.
  * Fix problem with `lblock`/`cblock`/`rblock` when `chop` is
    invoked. This caused very strange behavior in which text
    got reversed in certain circumstances.

## 0.1

  * Initial release.