fast-tags: Fast incremental vi and emacs tags.

[ bsd3, development, haskell, library, program ] [ Propose Tags ]

Yet another tags program. Like hasktags, it uses its own parser rather than haskell-src or haskell-src-exts, so it's fast. It understands hsc and literate haskell.

In addition, it will load an existing tags file and merge generated tags.

The intent is to bind it to vim's BufWrite autocommand to automatically keep the tags file up to date. This only works for files changed by the editor of course, so you may want to bind 'rm tags' to a pull posthook.

With the --fully_qualified flag and a fancy vim function, it can disambiguate tags based on their qualification, even if it's locally renamed. So M.x will find A.B.x if you import A.B as M.

To see the extra vim configuration, you probably have to get the source via cabal unpack or git clone.


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Versions 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.0.6, 1.0, 1.0.1, 1.1.0, 1.1.1, 1.2, 1.2.1, 1.3, 1.4, 1.4.1, 1.4.2
Change log
Dependencies array, async, base (>=3 && <5), bytestring, containers, cpphs (>1.18), deepseq, directory (>=, fast-tags, filepath, mtl (>=2.1), text (< || >, utf8-string [details]
License BSD-3-Clause
Author Evan Laforge
Maintainer Evan Laforge <>
Category Haskell, Development
Home page
Source repo head: git clone git://
Uploaded by EvanLaforge at Tue May 29 04:17:00 UTC 2018
Distributions NixOS:1.4.2
Executables fast-tags
Downloads 4439 total (78 in the last 30 days)
Rating (no votes yet) [estimated by rule of succession]
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Status Docs available [build log]
Last success reported on 2018-05-29 [all 1 reports]
Hackage Matrix CI





Spend more time optimizing a program (may yield up to 25% speedup)


add -auto-all


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


Maintainer's Corner

For package maintainers and hackage trustees

Readme for fast-tags-1.4.2

[back to package description]

fast-tags - fast and robust tag generator for Haskell

Build Status

Supported GHC versions

Tested with GHC 7.8.4, 7.10.3, 8.0.2, 8.2.2, 8.4.1.


Build with either cabal or stack.


In order to generate tags for all Haskell files under current directory, issue

  fast-tags -R .

See vimrc for an example of how to keep the tags file up to date automatically, and for a way to use qualified names to disambiguate tags