[Haskell-cafe] [ANN] normalization-insensitive-2.0

Patrick Pelletier code at funwithsoftware.org
Tue Aug 9 15:04:56 UTC 2016

normalization-insensitive is identical to case-insensitive, except it is 
insensitive to Unicode normalization, rather than case.  The module 
Data.Unicode.NormalizationInsensitive provides the NI type constructor 
which can be parameterized by a string-like type like: String, 
ByteString, Text, etc..  Comparisons of values of the resulting type 
will be insensitive to normalization.


I created this to solve a problem I was running into comparing filenames 
on Mac OS X.  Because Mac OS X converts all filenames to Normalization 
Form D, the filenames I read back from disk were different than the 
filenames I had written to disk.  This package solved the problem very 

Under the hood, normalization-insensitive uses the unicode-transforms 
package, which Harendra Kumar announced a few days ago on haskell-cafe.  
This avoids having to pull in any heavyweight dependencies like ICU.

Thanks to Bas van Dijk for writing case-insensitive, upon which 
normalization-insensitive is based.  And thanks for Harendra Kumar for 
reviewing normalization-insensitive and providing feedback, as well as 
writing unicode-transforms.

Although this is the first release of normalization-insensitive, the 
version number is 2.0 to avoid any confusion with the version numbers of 


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