A few additions to vim-haskellConceal #9
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The patch looks scary but it is actually trivial: instead of having the
huge indented if-block, we can just have
if !exists('s:extraConceal')
finish
endif
at the beginning.
This makes the code less indented/spaghetti-like and somewhat easier to
add other flags.
The circle constant (tau) slowly becomes quite common (it is equal to 2*pi), popularized in Haskell community through the Diagrams package: http://projects.haskell.org/diagrams/haddock/Diagrams-Util.html#v:tau '<<' is commonly used in Text.Html.
We already use 'identical to' for '==', so let's be consistent and use 'not identical to' for '/='. The base-unicode-symbols[1] package uses both 'not equal' and 'not identical'. [1] http://hackage.haskell.org/package/base-unicode-symbols
Base-unicode-symbols[1] uses dot for multiplication, but most of the time it's indistinguishable. Let's use 'times' symbol. If anything, it is better than a star. [1] http://hackage.haskell.org/package/base-unicode-symbols
Except for 'return' and 'join', all of them already used in http://hackage.haskell.org/package/base-unicode-symbols Eta and Mu are common notations for 'return' and 'join', e.g. http://www.euclideanspace.com/maths/discrete/category/higher/monad/index.htm Even though they are letter-functions (similar to as we use lambda symbol for '\'), they can be easily made distinguishable from letter-variables by the colorscheme (using colors or bold type, alike to vectors vs. variables in math.)
These are not strictly mathematical/agreed upon notation symbols. But they do the job of making the code less cluttered with the multi-symbols names. To enable this notation one has to place this line into ~/.vimrc: let informal_haskell_conceal=1
Vim has some issues concealing with composite symbols like '«̳', and unfortunately there is no other common short notation for bind. But for readability we still want a single-space character. For the time being, these circled letters/mnemonics might work: b - normal bind, to the right (b "looks" to the right) d - bind to the left (mirrored b, "looks" to the left)
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I think I'll grab the set and boolean changes (and the div), the rest is too far fetched for a "generic" version. |
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Hello,
There were a few changes that I had in my local tree for some time. Recently I've got some time to cleanup and split them for review/pull request.
The changes are logically separated, please see the commit messages for the justification. I guess the main addition is in the following patch:
'Add some more arithmetic, logic, set, type, monoid and monad notation'
The notation there was taken from the base-unicode-symbols package, so it should be pretty universal.
The last two patches in the series are using informal notation (protected by a flag). If you don't like any of the commits, I can remove them from the for-upstream branch and resend.
Thanks!