Add Haskell parser from Geany

[techee]

Haskell https://en.wikipedia.org/wiki/Haskell_%28programming_language%29

[codecov]

Codecov Report

Merging #2712 (3be0d41) into master (8d0f6d5) will increase coverage by 0.01%.
The diff coverage is 91.12%.

@@            Coverage Diff             @@
##           master    #2712      +/-   ##
==========================================
+ Coverage   87.00%   87.01%   +0.01%     
==========================================
  Files         190      191       +1     
  Lines       40450    40619     +169     
==========================================
+ Hits        35192    35346     +154     
- Misses       5258     5273      +15     

Impacted Files	Coverage Δ
parsers/haskell.c	91.12% <91.12%> (ø)

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[coveralls]

Coverage increased (+0.02%) to 87.1% when pulling 3be0d41 on techee:geany_haskell_parser into 8d0f6d5 on universal-ctags:master.

[masatake]

Can I ask you to provide a test case for LiterateHaskell?
This is the first time to hear about it.

[techee]

This is the first time to hear about it.

Yeah, same here. Not sure if anyone is crazy enough to use it:

https://www.haskell.org/onlinereport/literate.html

[masatake]

If Haskel code is embedded in latex code, I think using Tex parser will be better.
Real lhs language processor may just ignore Latex code part.
However, ctags should make tags for the Latex code part, too.

Give me time.

But the Haskel parser is obviously useful. So I will merge this PR in soon. I should not make you wait for more.

[techee]

The question really is whether the literate haskell part is any useful and whether it shouldn't be removed completely. I can't really imagine that anyone would code this way.

[techee]

I've just checked and in Geany we don't use the literate haskell part. Personally, I'd just remove it. Should I do it?

[masatake]

I've just checked and in Geany we don't use the literate haskell part. Personally, I'd just remove it. Should I do it?

No, you don't need to remove it.

Instead, could you resolve the conflict?

[masatake]

Thank you very much.