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Awesome Open Source

What is MissingH?

It's a collection of Haskell-related utilities. It is an extension of my earlier work developing MissingLib for OCaml. You can download MissingH from There is a mirror, with a few days' lag, at

Major Features

  • Powerful Logging Framework for Haskell This framework provides a system of hierarchical loggers and modular handlers permitting fine-grained logging with a great deal of control and yet a simple and fast interface. It's based on log4j for Java and logging for Python.

    Also included is a native-Haskell Syslog client.

  • Versatile modules to simplify everyday tasks:

    • FTP client library
    • E-mail client library
    • MIME types library to determine MIME types from files or URLs
    • Configuration file parser/generator
  • IO utilities make it easier to work with line-based text files and binary files

  • IO object virtualization so you can use one set of code to work on files of many different types

  • Filesystem virtualization so you can access various items with the same ease as your system's filesystem

  • Network utilities to streamline connections

  • List utilities including association list tools, list splitting, truncation, and delimiter joining

  • String utilities including removal of leading or trailing whitespace, joining, splitting, and truncation

  • Other utilities for threads, parsers, filenames, etc.

  • Printf utilities for formatting strings

  • GZip decompression

  • Hundreds of unit tests to verify proper functionality

  • DBM module abstraction

The following modules are are provided at this time, and more are likely to follow:

MissingH.AnyDBM * Generic DBM-like database infrastructure

MissingH.AnyDBM. * Use a Map in the AnyDBM interface MapDBM

MissingH.AnyDBM. * Simple persistent mapping storage StringDBM

MissingH.Bits * Obtain individual bytes from a bitfield

MissingH.Cmd * Trap errors during calls to external programs

MissingH.Checksum.* * Utilities for calculating checksums over strings

MissingH.Compression.* * Compression/decompression algorithms

MissingH.Compression. * The Inflate algorithm from unzip and Inflate gunzip

MissingH.ConfigParser * Configuration file parser * Interpolation supported * Compatible with Python and OCaml ConfigParsers

MissingH.Daemon * Support for detaching from a terminal

MissingH.Debian * Compare two Debian version numbers [ does not require Debian to compile ]

MissingH.Debian. * Parse debian/control files or output from ControlParser various Debian commands that use the same format [ does not require Debian to compile run ]

MissingH.Either * Utilities for the Either type/Error monad

MissingH.Email.Parser * Parse a flat string into component parts * Walk through the components of a message

MissingH.Email.Sendmail * Send a message via a locally-installed Sendmail program

MisssingH.FileArchive. * Support for analyzing and extracting GZip GZip archives

MissingH.Hsemail * E-mail parsers

MissingH.HUnit * Utilities for writing HUnit unit tests

MissingH.IO * Copying data between files or handles * Lazy operations on line input

MissingH.IO.Binary * Binary I/O with Haskell Strings or [Word8] * Lazy operations on binary blocks * Binary file copy

MissingH.IO.HVFS * Haskell Virtual File System * Lets you emulate real filesystems and work with multiple filesystems

MissingH.IO.StatCompat * Utilities for simulating stat(2) structures on home-grown filesystems or Windows

MissingH.IO.WindowsCompat * Provides POSIX-like functions on Windows

MissingH.List * Association list manipulation * List splitting and delimiter joining * Truncation

MissingH.Logging * Base logging types

MissingH.Logging.Handler * Base handler types

MissingH.Logging. * Logging to a stream Handler.Simple * Logging to a file

MissingH.Logging. * Logging to local or remote syslog Handler.Syslog * No C library implementation required

MissingH.Logging.Logger * Primary user interface to logging * Documentation for the logging system

MissingH.Map * Flip a Map and other utilities

MissingH.Maybe * forceMaybe utility function

MissingH.MIMETypes * Determine the MIME type of a file * Guess an extension based on MIME type

MissingH.Network * Establish TCP connections easily * Trap SIGPIPE to prevent odd crashes

MissingH.Network. * Versatile FTP client module FTP.Client * Full support for uploads and downloads * Passive or standard mode * Lazy uploads and downloads * Also provides low-level interface to issue advanced server commands

MissingH.Network. * Parse FTP protocol replies FTP.Parser

MissingH.Parsec * Invert the sense of a parser

MissingH.Path * Split apart filename components * Recursive directory scanning * Recursive file/directory removal (rm -r)

MissingH.Path.Glob * Expand wildcards to obtain a list of files

MissingH.Path.WildPath * Evaluate filenames or strings against wildcards * Convert wildcards to regular expressions

MissingH.Regex.Pesco * Perl-like regular expression operations and operators

MissingH.Str * Leading/trailing whitespace removal * Beginning/ending tests * Joining, splitting, and truncation

MissingH.Str.CSV * Parsing of comma-separated value (CSV) files

MissingH.Threads * Threaded callbacks

MissingH.Time * Utilities for working with times and dates

MissingH.Time. * Parsing of dates, similar to strptime() in C ParseDate

Wash.Mail.* * Generate or parse e-mail messages * Full support for headers and MIME

Wash.Utility.* * Base64 codec * Various Internet-related parsers

The entire library has no prerequisites save the Haskell standard library and is designed to install without complexity on a variety of systems. It could also easily be embedded within your own source trees so that users need not have it installed beforehand.


Quick Start

See the file INSTALL (Linux/Unix/BSD/Posix) or INSTALL-win.txt (Windows).

Usage in programs

You can simply use -package MissingH in most compilers to enable this library.

Hugs users will need to use -98 +o to use certain modules.

GHC users will need to use this for certain modules: -fallow-overlapping-instances -fallow-undecidable-instances

The API docs can be built with "make doc", or you can find them at:

Author & Homepage

MissingH was written by John Goerzen [email protected].

The latest version may be obtained at:

Documentation is also available on that page.

This program is copyrighted under the terms of the GNU General Public License. See the COPYRIGHT and COPYING files for more details.

If the GPL is unacceptable for your uses, please e-mail me; alternative terms can be negotiated for your project.

Certain code in MissingH was written by third parties. Licenses of these components may vary and are stated in COPYRIGHT. All code in MissingH is GPL-compatible, and the work as a whole may be distributed as a GPL'd work.

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