This library lets you create a one-shot timer, poll it using STM, and update it to ring at a different time than initially specified. It uses GHC event manager timeouts when available, yielding performance similar to threadDelay and registerDelay. Otherwise, it falls back to forked threads and threadDelay.

This package provides automatic formatting for Haskell files. Both a library and an executable.

This package provides Type-level booleans.

This package provides utilities to inline C++ code into Haskell using inline-c.

A reusable library containing hledger's core functionality. This is used by most hledger* packages so that they support the same common file formats, command line options, reports etc.

hledger is a robust, cross-platform set of tools for tracking money, time, or any other commodity, using double-entry accounting and a simple, editable file format, with command-line, terminal and web interfaces. It is a Haskell rewrite of Ledger, and one of the leading implementations of Plain Text Accounting.

This package provides a family of combinators for defining webservices APIs and serving them . You can learn about the basics in the <http://docs.servant.dev/en/stable/tutorial/index.html tutorial>. . <https://github.com/haskell-servant/servant/blob/master/servant/CHANGELOG.md CHANGELOG>

This library provides a utility function liftType, which accepts a type application argument and returns the Template Haskell Type representation of it.

This package provides functions to marshal values from Haskell to Lua, and /vice versa/. . This package is part of HsLua, a Haskell framework built around the embeddable scripting language <https://lua.org Lua>.

Provides Default instances for types from the old-locale package.

This package provides tools to parse Haskell sources to the template-haskell abstract syntax.

This Haskell package provides an API for constructing vectors. It provides the composable Builder abstraction, which has instances of the Monoid and Semigroup classes.

You would first use the Builder abstraction to specify the structure of the vector; then you can execute the builder to actually produce the vector.

This library provides a pure Haskell implementation of the Unicode Collation Algorithm described at http://www.unicode.org/reports/tr10/. It is not as fully-featured or as performant as text-icu, but it avoids a dependency on a large C library. Locale-specific tailorings are also provided.

This library provides minimal Haskell binding to libxml2.

This library provides typeclasses for rendering ghc-commonmark to Pandoc types.

This package provides utilities and combinators for parsing command line options in Haskell.

This package provides a means of generating tag files for Emacs and Vim.

This Haskell package provides compatibility layer for ghc-aeson.

This package provides a data type These a b which can hold a value of either type or values of each type. This is usually thought of as an "inclusive or" type (contrasting Either a b as "exclusive or") or as an "outer join" type (contrasting (a, b) as "inner join").

data These a b = This a | That b | These a b

Since version 1, this package was split into parts:

• https://hackage.haskell.org/package/semialign For Align and Zip type-classes.

• https://hackage.haskell.org/package/semialign-indexed For SemialignWithIndex class, providing ialignWith and izipWith

• https://hackage.haskell.org/package/these-lens For lens combinators.

• http://hackage.haskell.org/package/monad-chronicle For transformers variant of These.

Happy is a parser generator for Haskell. Given a grammar specification in BNF, Happy generates Haskell code to parse the grammar. Happy works in a similar way to the yacc tool for C.

This package provides a compatibility layer for using GHC call stacks with different versions of the compiler.

Prior to base-4.7.0.0 there was no Eq instance for ErrorCall. This package provides an orphan instance.

This package provides a module to use Skylighting to perform syntax highlighting and display the results in Brick-based interfaces.

doclayout is a pretty-printing library for laying out text documents, with several features not present in pretty-printing libraries designed for code. It was designed for use in Pandoc.

Trifecta is a modern parser combinator library for Haskell, with slicing and Clang-style colored diagnostics.