A decimal number has an integer mantissa and a negative exponent. The exponent can be interpreted as the number of decimal places in the value.

This package provides a Haskell library for setting environment variables.

Please see the README and documentation at <https://www.stackage.org/package/githash>

Efficient hashing-based container types. The containers have been optimized for performance critical use, both in terms of large data quantities and high speed.

Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. It can read and write Markdown and (subsets of) other formats, such as HTML, reStructuredText, LaTeX, DocBook, and many more.

Pandoc extends standard Markdown syntax with footnotes, embedded LaTeX, definition lists, tables, and other features. A compatibility mode is provided for those who need a drop-in replacement for Markdown.pl.

This package provides a small, efficient, and portable regex library for Perl 5 compatible regular expressions. The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5.

HAProxy protocol version 1.5 support (see http://haproxy.1wt.eu/download/1.5/doc/proxy-protocol.txt) for applications using io-streams. The proxy protocol allows information about a networked peer (like remote address and port) to be propagated through a forwarding proxy that is configured to speak this protocol.

This is a library for testing code involving bottoms or infinite values. For the underlying theory and a larger example involving use of QuickCheck, see the article "Chasing Bottoms A Case Study in Program Verification in the Presence of Partial and Infinite Values".

A binding to libffi, allowing C functions of types only known at runtime to be called from Haskell.

This library encourages an error-handling style that directly uses the type system, rather than out-of-band exceptions.

This package provides portable implementations of parts of the unix package. This package re-exports the unix package when available. When it isn't available, portable implementations are used.

This package provides datatypes to construct Free monads, Free monad transformers, and useful instances. In addition it provides the constructs to avoid quadratic complexity of left associative bind, as explained in:

• Janis Voigtlander, Asymptotic Improvement of Computations over Free Monads, MPC'08

Easy-to-write domain-specific language (DSL) for building Scalable Vector Graphics (SVG).

This Haskell library provides a type class for the error function, erf, and related functions. Instances for Float and Double.

Values of custom types usually have invariants imposed upon them. This package provides the Validity type class, which makes these invariants explicit by providing a function to check whether the invariants hold.

This package provides Haskell modules for accessing and manipulating fields of records.

This package provides pure-Haskell utilities for dealing with XML with the conduit package.

This package provides a data structure representing a bidirectional mapping between two key types. Each value in the bimap is associated with exactly one value of the opposite type.

Contravariant functors for Haskell.

This package provides type classes, a monad and a monad transformer that support unchecked extensible exceptions as well as asynchronous exceptions. It is compatible with the transformers package.

regex-applicative is a Haskell library for parsing using regular expressions. Parsers can be built using Applicative interface.

Efficient hashing-based container types. The containers have been optimized for performance critical use, both in terms of large data quantities and high speed.

This package provides Haskell bindings for libcmark-gfm, the reference parser for GitHub Flavored Markdown, a fully specified variant of Markdown. It includes sources for libcmark-gfm and does not require prior installation of the C library.

This package exports a module which is the recommended starting point for using microlens if you aren't trying to keep your dependencies minimal. By importing Lens.Micro.Platform you get all functions and instances from microlens, microlens-th, microlens-mtl, microlens-ghc, as well as instances for Vector, Text, and HashMap. The minor and major versions of microlens-platform are incremented whenever the minor and major versions of any other microlens package are incremented, so you can depend on the exact version of microlens-platform without specifying the version of microlens you need. This package is a part of the microlens family; see the readme on Github.