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# 1.0.2
- Output correct format when an input file is empty, e.g. `@@ --0,0 +1,3 @@`.
# 1.0.1.1
- Require `base >= 4.11` (GHC 8.4).
# 1.0
- Add Unix diff style annotations to output of `prettyContextDiff`,
e.g `@@ -1,5 +1,4 @@`. This required three changes to the
signature of `getContextDiff` due to the addition of a wrapper type
`Numbered`, which enumerates the elements of the input list.
- Signature change 1: The element pretty printer type changes from
`(a -> Doc)` to `(Numbered a -> Doc)`. An unnumber function is
provided so that the old behavior can be obtained by changing that
argument from `pretty` to `(pretty . unnumber)`
- Signature change 2: The result type of getContextDiff changes from
`ContextDiff a` to `ContextDiff (Numbered a)`. A function
`unNumberContextDiff` is provided to convert the result back to
the old type.
- Signature change 3: the context argument is now `Maybe Int` rather
than `Int`, reflecting the change made to `getContextDiffNew` in 0.5.
- A `prettyContextDiffOld` function is provided to get the old
style output.
- The old broken version of getContextDiffOld is removed.
- Document the behavior of `groupBy'`.
# 0.5
- Bring space complexity down to D^2 (Bodigrim).
- Add `Bifunctor` instance (Jonathan King). Requires `base` >= 4.8.
- Fix for the grouped context diff. It was omitting all trailing contexts.
- Allow unlimited number of context elements (`getContextDiffNew`).
# 0.4
- Generalize `Diff a` to `PolyDiff a b`.
`Diff` has been replaced with a specialized synonym `type Diff a = PolyDiff a a`,
but it's still not backward compatible if you imported `Diff(..)`.
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