cannot install

[jaffa4]

Hello,
I am trying to use your package... on Windows
I get this

stack install chatter

Error: While constructing the build plan, the following exceptions were encountered:

In the dependencies for chatter-0.9.1.0:
cereal-0.5.4.0 must match >=0.4.0.1 && <0.5.4.0 (latest applicable is 0.5.3.0)
needed for unknown reason - stack invariant violated.
What is this?

[creswick]

I'm not very familiar with stack, but I was able to get it to install by updating my global stack.yaml, adding three lines to the extra-deps: setting.

Note that the path to your global-project/stack.yaml will be different; I don't have a windows machine. The error you saw should direct you to this file, though.

$HOME/.stack/global-project/stack.yaml
# This is the implicit global project's config file, which is only used when
# 'stack' is run outside of a real project.  Settings here do _not_ act as
# defaults for all projects.  To change stack's default settings, edit
# '/Users/exc20816/.stack/config.yaml' instead.
#
# For more information about stack's configuration, see
# http://docs.haskellstack.org/en/stable/yaml_configuration/
#
flags: {}
extra-package-dbs: []
packages: []
extra-deps:
- fullstop-0.1.4
- tokenize-0.3.0
- cereal-0.5.3.0
resolver: lts-8.2

Maybe someone else can help figure out the "right" way to fix this; editing a global config doesn't seem right.

[jaffa4]

This works yes... can you tell me where I can find example/tutorial?

[creswick]

There is a lot of information about stack here: https://docs.haskellstack.org/en/stable/README/

However, until chatter (and all chatter's dependencies) are in stackage, this is unlikely to work properly.

I've been looking around a bit, and there are few details about how stack does package resolution for things not in stackage; I'm honestly quite confused that 'stack install ' doesn't just report an error.

For my packages, you'll probably have better luck just using cabal.

[jaffa4]

I mean about chatter.

[creswick]

Oh! I haven't really written a tutorial yet, but I have tried to make the API docs pretty simple to follow. They are similar to a tutorial, and you can find all the API docs on hackage: https://hackage.haskell.org/package/chatter-0.9.1.0

Start here for POS tagging:

• https://hackage.haskell.org/package/chatter-0.9.1.0/docs/NLP-POS.html

Here for Phrase Chunking:

• https://hackage.haskell.org/package/chatter-0.9.1.0/docs/NLP-Chunk.html

Information extraction with Parsec is sparse, but there are some examples here:

• https://hackage.haskell.org/package/chatter-0.9.1.0/docs/NLP-Extraction-Examples-ParsecExamples.html

I don't have any examples for document similarity handy.