homplexity: Haskell code quality tool

[ bsd3, language, library, program, tools ] [ Propose Tags ]

Homplexity aims to measure code complexity, warning about fragments that might have higher defect probability due to bad coding style on-the-large:

  • too large functions

  • too deeply nested conditions

  • too few comments

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Manual Flags


Build static binary

Automatic Flags

Enable HTML output via blaze-html


Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info


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Versions [RSS] 0.2,,,,,,,,,,,,,,,,,,, (info)
Change log changelog.md
Dependencies base (>=4.5 && <4.19), blaze-html (>=0.9 && <1), blaze-markup (>=0.8 && <0.9), bytestring, Cabal (>=, containers (>=0.3 && <0.7), cpphs (>=1.5 && <1.21), deepseq (>=1.3 && <1.7), directory (>=1.1 && <1.4), filepath (>=1.2 && <1.5), githash (>= && <1.0), haskell-src-exts (>=1.20 && <1.24), hflags (>=0.3 && <0.5), homplexity, template-haskell (>=2.6 && <2.20), uniplate (>=1.4 && <1.7) [details]
License BSD-3-Clause
Copyright Copyright by Michal J. Gajda and contributors '2015-'2020 https://gitlab.com/migamake/homplexity/-/graphs/master
Author Michal J. Gajda
Maintainer mjgajda@migamake.com
Category Language, Tools
Home page https://gitlab.com/migamake/homplexity
Bug tracker https://gitlab.com/migamake/homplexity/issues
Source repo head: git clone https://gitlab.com/migamake/homplexity.git
Uploaded by MichalGajda at 2022-10-09T12:32:48Z
Reverse Dependencies 1 direct, 0 indirect [details]
Executables homplexity-cli
Downloads 9235 total (30 in the last 30 days)
Rating 1.25 (votes: 1) [estimated by Bayesian average]
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Status Docs uploaded by user
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Readme for homplexity-

[back to package description]


Aims to assess complexity and quality of Haskell code by measuring relative length of declarations, their depth, and code-to-comment ratio.

For parsing it uses haskell-src-exts, and cppHs.

Cabal builds across GHC versions: Gitlab pipeline status

Hackage Hackage Dependencies

If you just need latest static executable it is always available here.

Official releases are on Hackage



After installing with cabal install homplexity, you might run it with filenames or directories with your Haskell source

    homplexity Main.hs src/ 

Patches and suggestions are welcome.

You may run homplexity --help to see options.

For html output, run:

    homplexity --format=HTML Main.hs src/ 

How does it work?

Homplexity is based on the idea of Metrics that are applied to various CodeFragment types extracted automatically from parsed source. Each metric is then assessed whether it crosses any thresholds, and depending on them the severity of the message is chosen.

To see all metric values, set the warning --severity to INFO.

Diagram of concepts Legend of the diagram